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基于钴基沸石咪唑酯骨架增强电催化硫离子氧化反应活性的研究
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作者 冯翔瑞 张杨 +5 位作者 符波 安琪 刘崇菠 容柏基 高涛涛 黄彦彦 《化学研究与应用》 CAS 北大核心 2024年第11期2694-2699,共6页
电解水是可持续绿色制氢的重要方法,但阳极缓慢的析氧反应(OER)严重阻碍电解水能量转化效率的提升,利用氧化电位较低的硫离子氧化反应(SOR)替代OER与阴极析氢反应耦合可以实现能耗的大幅降低。本文通过共沉淀法成功制备了一种钻基沸石... 电解水是可持续绿色制氢的重要方法,但阳极缓慢的析氧反应(OER)严重阻碍电解水能量转化效率的提升,利用氧化电位较低的硫离子氧化反应(SOR)替代OER与阴极析氢反应耦合可以实现能耗的大幅降低。本文通过共沉淀法成功制备了一种钻基沸石咪唑酯骨架材料(ZIF-67),通过XRD、SEM、XPS测试手段对催化材料进行了物相分析,结果表明制备的ZIF-67催化材料由许多堆积在一起的立方体纳米颗粒组成。在三电极体系中对其进行SOR催化性能测试,将ZIF-67涂敷在泡沫镍基底上作为工作电极(ZIF-67/NF),ZIF-67/NF仅需0.361Vvs.RHE的电压就可以达到50mA·cm^(2)的电流密度,其电催化活性远优于Co(OH),/NF和NF。ZIF-67/NF还表现出最低的Tafel斜率(73mA·dec^(-1))和最小的电化学阻抗,并展现出良好的稳定性此外,对基于SOR的两电极耦合制氢体系的电化学性能进行了测试,发现所需施加电压远小于传统的全水解制氢系统,为超低能耗制氢提供一种切实可行的方案。 展开更多
关键词 电解水 电化学制氢 硫氧化反应 ZIF-67 耦合反应
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微波法超快制备泡沫镍负载的Co/Zn氧化物增强硫离子氧化反应活性
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作者 刘崇菠 杨茗 +5 位作者 安琪 唐相民 虞淑敏 高涛涛 陈渝 赵虔 《化学研究与应用》 CAS 北大核心 2024年第9期2056-2063,共8页
本文通过微波法超快速制备了泡沫镍(NF)负载的Co/Zn复合氧化物(Co-Zn/NF)。XRD测试表明生成的Co/Zn复合氧化物具有低结晶度。采用线性扫描伏安法(LSV)测试了Co-Zn/NF在碱性条件下的电催化硫离子氧化性能。与泡沫镍负载的单金属氧化物(Co... 本文通过微波法超快速制备了泡沫镍(NF)负载的Co/Zn复合氧化物(Co-Zn/NF)。XRD测试表明生成的Co/Zn复合氧化物具有低结晶度。采用线性扫描伏安法(LSV)测试了Co-Zn/NF在碱性条件下的电催化硫离子氧化性能。与泡沫镍负载的单金属氧化物(Co/NF和Zn/NF)相比,Co-Zn/NF表现出更好的催化性能。在含有1 mol·L^(-1)Na2S和1 mol·L^(-1)NaOH的电解液中,Co-Zn/NF达到100 m A·cm^(-2)的电流密度所需的电位仅为0.28 V vs RHE,并且在恒定100 m A·cm^(-2)的电流密度下,长时间工作35小时后仍保持高的催化性能。此外,组装非对称电解槽(阳极:硫离子氧化反应(sulfion oxidation reaction,SOR)用1 mol·L^(-1)Na2S和1mol·L^(-1)NaOH为电解质,阴极:析氢反应(hydrogen evolution reaction,HER)用1 mol·L^(-1)Na OH为电解质)进行双电极硫氧化辅助电解水制氢测试,与传统的碱性电解水相比,达到100 m A·cm^(-2)电流密度所需的能耗降低了46%。本工作为低能耗电化学制氢提供了一种新思路,并证明了SOR耦合HER电解水制氢具有实际应用的可行性。 展开更多
关键词 微波加热 钴/锌复合氧化 硫氧化反应 低能耗制氢
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镍钴双金属化合物作为高效的硫氧化催化剂并辅助超低能耗电化学制氢
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作者 安琪 高涛涛 +4 位作者 刘崇菠 虞淑敏 唐相民 杨茗 张颖 《化学研究与应用》 CAS 北大核心 2024年第9期2150-2155,共6页
本工作通过简便快捷的电沉积法在泡沫镍基底上超快速制备镍钴双金属化合物(Ni-Co@NF)作为高效的硫离子氧化反应(Sulfion oxidation reaction,SOR)催化剂。并将基于Ni-Co@NF催化的SOR反应代替电化学析氧半反应(Oxygen evolution reaction... 本工作通过简便快捷的电沉积法在泡沫镍基底上超快速制备镍钴双金属化合物(Ni-Co@NF)作为高效的硫离子氧化反应(Sulfion oxidation reaction,SOR)催化剂。并将基于Ni-Co@NF催化的SOR反应代替电化学析氧半反应(Oxygen evolution reaction,OER)与析氢反应(Hydrogen evolution reaction,HER)耦合,成功构建新型低能耗耦合制氢反应体系。通过分析催化材料的X射线衍射谱图、扫描电镜图片和X射线光电子能谱图可知:镍钴双金属呈纳米片状结构成功负载在泡沫镍基底上。随后Ni-Co@NF的SOR性能测试显示其具有较高的SOR本征活性,仅需要0.347V vs.RHE的超低电势即获得100mA·cm^(-2)的电流密度。除此之外,Ni-Co@NF催化材料不仅具有最低的Tafel斜率(77m V·dec^(-1))和最小的电化学阻抗,还拥有良好的催化稳定性。以上结果均证实Ni-Co@NF具有优异的SOR电催化性能。同时,我们在实际电化学制氢的双电极系统中对比了阳极SOR和OER的电势,进一步证明了使用SOR代替OER可以有效降低整体电化学制氢的能耗。 展开更多
关键词 电沉积 电解水 硫氧化反应 镍钴基纳米材料 氢能
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钼基碳掺杂二硫化钼电极的硫氧化反应性能
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作者 王忠远 周青青 +1 位作者 胡浩 王家德 《科学通报》 EI CAS CSCD 北大核心 2023年第28期3846-3856,共11页
硫钝化是阻碍硫化物氧化反应(sulfur oxidation reaction,SOR)在硫锂电池、电化学脱硫、含硫污染物资源化等领域高效进行的重要因素.二硫化钼(MoS2)因其优异的抗硫性和可调的二维层状结构而具有良好的SOR潜能,但其本征半导体性质限制了... 硫钝化是阻碍硫化物氧化反应(sulfur oxidation reaction,SOR)在硫锂电池、电化学脱硫、含硫污染物资源化等领域高效进行的重要因素.二硫化钼(MoS2)因其优异的抗硫性和可调的二维层状结构而具有良好的SOR潜能,但其本征半导体性质限制了电子传递过程.本文报道了一种抗硫性钼基碳掺杂二硫化钼电极(Mo/C-MoS2),通过碳掺杂使MoS2电极具有接近热中性的硫吸附吉布斯自由能和快速转换多硫化物的能力,有效避免了硫钝化.实验结果显示,Mo/C-MoS2能以0.37 V驱动SOR反应达到10 mA/cm2,低于Mo/MoS2电极(0.41 V)和Pt电极(0.68 V),并在恒电位电解测试中保持16.5 h的抗硫钝化稳定性.透射电子显微镜(transmission electron microscope,TEM)、X射线衍射(X-ray diffraction,XRD)、X射线光电子能谱(X-ray photoelectron spectroscopy,XPS)、拉曼散射光谱表征证实,CMoS2具有1T导电相晶体结构,提升了催化反应速率.密度泛函理论(density functional theory,DFT)计算进一步阐明,碳掺杂增强了MoS2与Na2S之间的相互作用,促使元素硫向可溶性多硫化物转换,为Mo/C-MoS2电极高效SOR和稳定抗硫性的实验结论提供了理论支撑. 展开更多
关键词 电化学 硫氧化反应 钝化 化物转换 化钼 碳掺杂调控
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清洁燃料脱硫技术进展 被引量:11
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作者 姚秀清 张杰 +3 位作者 李菲菲 王少军 凌凤香 马波 《辽宁石油化工大学学报》 CAS 2004年第1期39-42,共4页
 油品中含硫化合物所产生的危害是多方面的,特别是近年来车用燃料尾气排放的二氧化硫对环境造成的负面影响更引起了人们的关注。发达国家纷纷制定环保法规严格限制油品中硫的质量分数,因此,讨论各种脱硫技术对我国炼油工业具有重要意...  油品中含硫化合物所产生的危害是多方面的,特别是近年来车用燃料尾气排放的二氧化硫对环境造成的负面影响更引起了人们的关注。发达国家纷纷制定环保法规严格限制油品中硫的质量分数,因此,讨论各种脱硫技术对我国炼油工业具有重要意义。介绍了当前轻质油品脱硫的一些方法,包括传统的加氢脱硫和吸附脱硫等。着重对基于氧化反应的几种脱硫技术,如CED,ASR-2,超声波脱硫,光氧化法脱硫等进行了介绍,同时对烷基化脱硫,沉淀脱硫等方法也给予了简介。与传统的加氢脱硫方法相比,各种非加氢脱硫方法将会得到更大的发展。 展开更多
关键词 清洁燃料 加氢脱 吸附脱 氧化反应 烷基化反应
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Catalytically altering the redox pathway of sulfur in propylene carbonate electrolyte using dual-nitrogen/oxygen-containing carbon
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作者 Linghui Yu Heng Zhang +9 位作者 Luyuan Paul Wang Samuel Jun Hoong Ong Shibo Xi Bo Chen Rui Guo Ting Wang Yonghua Du Wei Chen Ovadia Lev Zhichuan J.Xu 《Chinese Journal of Catalysis》 SCIE CAS CSCD 2024年第8期224-233,共10页
Carbonate electrolytes are one of the most desirable electrolytes for high-energy lithium-sulfur batteries(LSBs)because of their successful implementation in commercial Li-ion batteries.The low-polysulfide-solubility ... Carbonate electrolytes are one of the most desirable electrolytes for high-energy lithium-sulfur batteries(LSBs)because of their successful implementation in commercial Li-ion batteries.The low-polysulfide-solubility feature of some carbonate solvents also makes them very promising for overcoming the shuttle effects of LSBs.However,regular sulfur electrodes experience undesired electrochemical mechanisms in carbonate electrolytes due to side reactions.In this study,we report a catalytic redox mechanism of sulfur in propylene carbonate(PC)electrolyte based on a compari-son study.The catalytic mechanism is characterized by the interactions between polysulfides and dual N/O functional groups on the host carbon,which largely prevents side reactions between polysulfides and the carbonate electrolyte.Such a mechanism coupled with the low-polysulfide-solubility feature leads to stable cycling of LSBs in PC electrolyte.Favorable dual N/O functional groups are identified via a density functional theory study.This work provides an alternative route for enabling LSBs in carbonate electrolytes. 展开更多
关键词 Energy storage Lithium-sulfur battery Catalytic redox reaction Porous carbon Carbonate electrolyte
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银杏叶黄酮对小鼠和大鼠肝脏脂质过氧化的影响
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作者 唐祖年 韦玉先 +1 位作者 梁荣感 马孟斌 《华夏医学》 CAS 1995年第3期243-245,共3页
本文采用硫代巴比妥酸反应法,观察了银杏叶黄酮对小鼠和大鼠正常肝匀浆及四氯化碳(ccl4)引起的脂质过氧化作用的影响,并观察了对小鼠血清SGPT的影响。结果表明,银杏叶黄酮对体外小鼠和大鼠肝匀浆及ccl4引起的脂质过氧... 本文采用硫代巴比妥酸反应法,观察了银杏叶黄酮对小鼠和大鼠正常肝匀浆及四氯化碳(ccl4)引起的脂质过氧化作用的影响,并观察了对小鼠血清SGPT的影响。结果表明,银杏叶黄酮对体外小鼠和大鼠肝匀浆及ccl4引起的脂质过氧化均有显著降低。而对体内小鼠的脂质过氧化及ccl4诱导的SGPT升高无明显影响。 展开更多
关键词 银杏叶黄酮 脂质过氧化 代巴比妥酸反应 肝匀浆.
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Removal of SO_2 and NO_x by Pulsed Corona Combined with in situ Ca(OH)2 Absorption 被引量:12
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作者 黄立维 党永霞 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2011年第3期518-522,共5页
Removal of SO2 and NOx by pulsed corona combined with in situ alkali absorption was experimentally investigated.In the reactor,a plate-wire-plate combination is devised for generating pulsed corona and then alkaline a... Removal of SO2 and NOx by pulsed corona combined with in situ alkali absorption was experimentally investigated.In the reactor,a plate-wire-plate combination is devised for generating pulsed corona and then alkaline absorbent slurries were introduced into the reactor by a continuous band conveying system to capture the gaseous reaction products.It was found that both SO2 and NO could be removed by corona combined with in situ alkali absorption.The removal of SO2 increased to 75%with the corona discharge,compared with 60%removal only with Ca(OH)2 absorption.About 40%removal of NO was reached by pulsed corona combined with in situ Ca(OH)2 absorption.It was found that SO2 and NO in the gas stream are oxidized to SO3 and NO2 by pulsed corona respectively,and then absorbed by the alkali in the reactor.The removals of SO2 as well as NO were higher with Ca(OH)2 as the absorbent,compared with using CaCO3 or ZnO. 展开更多
关键词 pulsed corona ABSORPTION DENITRIFICATION DESULFURIZATION REMOVAL Ca(OH)2
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Pressure leaching of zinc silicate ore in sulfuric acid medium 被引量:11
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作者 李存兄 徐红胜 +3 位作者 邓志敢 李兴彬 李旻廷 魏昶 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2010年第5期918-923,共6页
Zinc silicate ore was characterized mineralogically and the results showed that zinc exists mainly as hemimorphite and smithsonite in the sample.Sulfuric acid pressure leaching of zinc silicate ore was carried out to ... Zinc silicate ore was characterized mineralogically and the results showed that zinc exists mainly as hemimorphite and smithsonite in the sample.Sulfuric acid pressure leaching of zinc silicate ore was carried out to assess the effect of particle size,sulfuric acid concentration,pressure,reaction time and temperature on the extraction of zinc and the dissolution of silica.Under the optimum conditions employed,up to 99.25% of zinc extraction and 0.20% silica dissolution are obtained.The main minerals in leaching residue are quartz and small amounts of undissolved oxide minerals of iron,lead and aluminum are associated with quartz. 展开更多
关键词 zinc silicate ore sulfuric acid pressure leaching extraction of zinc dissolution of silica
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Oxidative Desulfurization of Non-hydrotreated Kerosene Using Hydrogen Peroxide and Acetic Acid 被引量:8
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作者 Asghar Molaei Dehkordi Mohammad Amin Sobati Mohammad Ali Nazem 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2009年第5期869-874,共6页
The oxidative desulfurization of a real refinery feedstock (i.e.,non-hydrotreated kerosene with total sulfur mass content of 0.16%) with a mixture of hydrogen peroxide and acetic acid was studied.The influences of var... The oxidative desulfurization of a real refinery feedstock (i.e.,non-hydrotreated kerosene with total sulfur mass content of 0.16%) with a mixture of hydrogen peroxide and acetic acid was studied.The influences of various operating parameters including reaction temperature (T),acid to sulfur molar ratio (nacid/nS),and oxidant to sulfur molar ratio (nO/nS) on the sulfur removal of kerosene were investigated.The results revealed that an increase in the reaction temperature (T) and nacid/nS enhances the sulfur removal.Moreover,there is an optimum nO/nS related to the reaction temperature and the best sulfur removal could be obtained at nO/nS=8 and 23 for the reaction temperatures of 25 and 60°C,respectively.The maximum observed sulfur removal in the present oxidative desulfurization system was 83.3%. 展开更多
关键词 oxidative desulfurization KEROSENE hydrogen peroxide acetic acid oxidation extraction
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SO_2/Hg removal from flue gas by dry FGD 被引量:5
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作者 Wang Fan Wang Hongmei +4 位作者 Zhang Fan Zhu Jinwei Tian Gang Liu Yu Mao Jixian 《International Journal of Mining Science and Technology》 2012年第1期107-110,共4页
To study the mechanism of SO2 and Hg removal from flue gas, an experimental packed bed reactor was designed to simulate the dry FGD, where a mixture of lime and fly ash in ratio 1:3 w/w was used as the S02 and Hg sor... To study the mechanism of SO2 and Hg removal from flue gas, an experimental packed bed reactor was designed to simulate the dry FGD, where a mixture of lime and fly ash in ratio 1:3 w/w was used as the S02 and Hg sorbent, and steam at temperature of 100 ℃ was applied for activation of the sorbent, while the activation time set to 20 rain. The experimental factors including the SO2/Hg sorbent characteristics, 50% breakthrough time for SO2/Hg removal, sorbent packed bed depth and reaction temperature were investigated. The experimental results show that after steam activation, the BET specific surface area and specific pore volume increased from 37.8 to 45.5 m^2/g and from 0.42 to 0.51 cm^3/g, respectively. With activation of the sorbent by steam, the 50% breakthrough times of SO2 and Hg removal increased from 34 to 42 rain and from 23 to 45 rain, respectively. When the packed bed depth was increased from 5 to 25 ram. the 50% breakthrough times for Hg and S02 removal increased from 12 to 52 rain and from 6 to 47 rain, respectively. With the increase of the reaction temperature, the 50% breakthrough of SO2/Hg removal decreased accordingly. Steam activation can efficiently improve SO2/Hg removal simultaneously. 展开更多
关键词 SO2 removal Hg removal Dry FGD Sorbent activation
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Preparation of Cu-BiVO_4 and Its Photocatalytic Properties for Desulfurization of Model Oil 被引量:2
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作者 Gao Xiaoming Wang Jing +1 位作者 Fu Feng Li Wenhong 《China Petroleum Processing & Petrochemical Technology》 SCIE CAS 2012年第4期17-23,共7页
A photocatalyst Cu-BiVO4 was synthesized by the hydrothermal method and was characterized by XRD, UV-vis DRS, and N2 adsorption-desorption measurement. The catalytic activity of the Cu-BiVO4 samples was studied on des... A photocatalyst Cu-BiVO4 was synthesized by the hydrothermal method and was characterized by XRD, UV-vis DRS, and N2 adsorption-desorption measurement. The catalytic activity of the Cu-BiVO4 samples was studied on desulfurization of thiophene dissolved in n-octane, which was used as a model light oil, via photocatalytic oxidation reaction under illumination by visible light. The catalyst characterization results indicated that the loading of Cu on the catalyst did not change the crystal phase of BiVO4, and the crystallinity of the Cu-BiVO4 sample was found to be better at pH=7. The Cu-BiVO4 samples presented a significant bathochromic shift of the absorption band in the visible region, and the absorption intensity increased for the composite catalyst. The desulfurization experiments showed that the Cu-BiVO4 sample prepared at a pH value of 7 had a better catalytic activity. Under proper operating conditions, the desulfurization rate of the model compound achieved by Cu-BiVO4 sample prepared at pH=7 could reach as high as 90%. 展开更多
关键词 PHOTOCATALYST Cu -BiVO4 DESULFURIZATION THIOPHENE
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Reduction of lead sulfate to lead sulfide with carbon monoxide 被引量:3
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作者 郑永兴 刘维 +4 位作者 覃文庆 焦芬 韩俊伟 杨康 罗虹霖 《Journal of Central South University》 SCIE EI CAS CSCD 2015年第8期2929-2935,共7页
In order to decrease the solubility of PbSO4 and enhance lead recovery from PbSO4 bearing wastes, CO was employed as a reductant to transform PbSO4 into Pb S. Reaction system was established and reductive thermodynami... In order to decrease the solubility of PbSO4 and enhance lead recovery from PbSO4 bearing wastes, CO was employed as a reductant to transform PbSO4 into Pb S. Reaction system was established and reductive thermodynamics of PbSO4 was calculated by software HSC 5.0. The effects of gas concentration, reaction temperature, time and mass of sample on reduction of PbSO4 were examined by thermogravimetry(TG) and XRD. Roasting tests further verify the conclusions of thermodynamic and TG analyses. The results show that increasing temperature in the reasonable range and CO content are favorable for the formation of Pb S. The reduction process is controlled by chemical reaction and calculation value of the activation energy is 47.88 k J/mol. 展开更多
关键词 lead sulfate REDUCTION carbon monoxide lead sulfide PYROMETALLURGY
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Leaching kinetics of molybdenum from Ni-Mo ore in sulfuric acid solution with sodium peroxodisulfate as oxidant 被引量:3
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作者 刘志雄 尹周澜 +1 位作者 陈义光 熊利芝 《Journal of Central South University》 SCIE EI CAS CSCD 2015年第3期874-879,共6页
The leaching kinetics of molybdenum from Ni-Mo ore in sulfuric acid solution with sodium peroxodisulfate was studied.The effects including leaching temperature, reaction time, particle size, stirring speed, and concen... The leaching kinetics of molybdenum from Ni-Mo ore in sulfuric acid solution with sodium peroxodisulfate was studied.The effects including leaching temperature, reaction time, particle size, stirring speed, and concentrations of sulfuric acid and sodium peroxodisulfate were investigated. The leaching process of molybdenum from Ni-Mo ore is controlled by the chemical reaction through the solid layer across the unreacted shrinking core. The apparent activation energy of the leaching of molybdenum is calculated to be 41.0 k J/mol and the leaching kinetics equation of molybdenum from Ni-Mo ore is expressed as1-(1-a)1/3=3405.7exp[-41030.0/(RT)]t. 展开更多
关键词 Ni-Mo ore leaching kinetics molybdenum oxidant sodium peroxodisulfate
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Novel stereoselective sulfur ylide epoxidation reaction catalyzed by ferrocenylsulfide
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作者 汪磊 黄志真 《Journal of Zhejiang University-Science A(Applied Physics & Engineering)》 SCIE EI CAS CSCD 2005年第7期636-639,共4页
A range of ferrocenyl sulfides are synthesized and screened. Among them l-a-methysulphoferrocenyl ethyl acetate and l-a-methysulphoferrocenyl alcohol are found to be unexpected catalysts, which is first reported media... A range of ferrocenyl sulfides are synthesized and screened. Among them l-a-methysulphoferrocenyl ethyl acetate and l-a-methysulphoferrocenyl alcohol are found to be unexpected catalysts, which is first reported mediating in sulfur ylide epoxidation reactions, furnishing a novel approach for highly stereoselective synthesis of oxiranes with 98%-100% trans-isomer. The protocol also has excellent yield, convenient workup and recycled starting material. The reason of high trans-selectivity is due to the bulky ferrocenyl sulfide group, which stabilizes the intermediates and determines the trans priority. A possible catalytic mechanism is also proposed. 展开更多
关键词 Ferrocenylsulfide Catalytic ylide epoxidation STEREOSELECTIVITY
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Microwave-assisted hydroxylation of benzene to phenol with H_2O_2 over FeSO_4/SiO_2 被引量:4
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作者 LIU Tong WEI Xianyong +3 位作者 ZHAO Jianjun XIE Hengsen WANG Taotao ZONG Zhimin 《Mining Science and Technology》 EI CAS 2010年第1期93-96,共4页
Hydroxyl radicals HO are generated under Fenton-like (Fe2++H2O2→HO?+OH?+Fe3+) catalytic conditions upon microwave irradiation. Liquid-phase direct catalytic oxidation of benzene to phenol was obtained using FeSO4 sup... Hydroxyl radicals HO are generated under Fenton-like (Fe2++H2O2→HO?+OH?+Fe3+) catalytic conditions upon microwave irradiation. Liquid-phase direct catalytic oxidation of benzene to phenol was obtained using FeSO4 supported on silica gel as a solid catalyst and hydrogen peroxide as the oxidant. The effects of various parameters, such as the different solvents, the amount of solvent used, the amount of catalyst used, the reaction time, the reaction temperature and the amount of hydrogen peroxide used on the yield of phenol were studied to identify optimum reaction conditions. Conventionally heated reaction gives a phenol yield of 0.6%. A higher phenol yield of 13.9% with a selectivity of 100% is obtained when the reaction mixture was irradiated with micro-wave energy. It is concluded that microwave irradiation offers more effective control of energy input for hydroxyl radical generation that is appropriate for various synthetic reactions. 展开更多
关键词 hydroxyl radicals Fenton catalytic conditions microwave energy
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Facile Conversion of Alcohols to Olefins by Tosylation and Subsequent SiO_2-promoted β-elimination
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作者 RUAN Xiaohong SONG Gaopeng ZHANG Yichun LI Yingxia 《Journal of Ocean University of China》 SCIE CAS 2007年第2期196-198,共3页
A convenient and effective procedure was developed for the conversion of alcohol to olefin by tosylation and subsequent β-elimination promoted by silica gel in this study. Treatment of the alcohols with p-toluenesulf... A convenient and effective procedure was developed for the conversion of alcohol to olefin by tosylation and subsequent β-elimination promoted by silica gel in this study. Treatment of the alcohols with p-toluenesulfonyl chloride in pyridine at 0℃ af- fords tosylates which undergo β-elimination with silica gel in dichloromethane or chloroform at room temperature, yielding olefins with high productivity. 展开更多
关键词 alcohol TOSYLATION silica gel OLEFIN β-elimination
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Effect of Sulfate Adlayer on Formic Acid Oxidation on Pd(111) Electrode
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作者 Jing Lei Zhen Wei +3 位作者 Mian-le Xu Jie Wei Yan-xia Chen Shen Ye 《Chinese Journal of Chemical Physics》 SCIE CAS CSCD 2019年第6期649-656,I0002,共9页
The kinetics of formic acid oxidation (FAO) on Pd(111) in 0.1 mol/L H2SO4+0.1 mol/L HCOOH with and without addition of Na2SO4 is studied using cyclic voltammetry and potential step method, which is compared with that ... The kinetics of formic acid oxidation (FAO) on Pd(111) in 0.1 mol/L H2SO4+0.1 mol/L HCOOH with and without addition of Na2SO4 is studied using cyclic voltammetry and potential step method, which is compared with that in 0.1 mol/L HClO4. It is found that adsorbed sulfate has significant inhibition effect on FAO kinetics. After addition of 0.05 mol/L or 0.1 mol/L Na2SO4, FAO current in the negative-going scan is found to be significantly smaller than that at the same potential in the positive-going scan. We speculate that at potentials positive of the phase transition potential for the (SO4*ad)m+[(H2O)n-H3O+] or(SO4*ad)m+[Na+(H2O)n-H3O+] adlayer, the adlayer structure probably becomes denser and more stable with the increase of potential or with the addition of Na2SO4. The formation of connected adlayer network greatly enhance the stability of the adlayer, and the insertion of positive-charged H+ or Na+ into the adlayer network further reduces the electrostatic repulsion between partially charged sulfates. As a result, the destruction/desorption of compact sulfate adlayer becomes more difficult, which leaves much less free sites on the surface for FAO, and thus FAO kinetics at higher potentials and in the subsequent negative-going potential scan is significantly inhibited. 展开更多
关键词 Formic acid oxidation Pd(111) electrode Sulfate adsorption Anions effect
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Mechanism of Chalcopyrite Leaching in Oxidative Sulphuric Acid Solution
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作者 Miroslav D. Sokic Branislav R. Markovic +2 位作者 Vladislav Lj. Matkovic Nada D. Strbac Dragana T. Zivkovic 《Journal of Chemistry and Chemical Engineering》 2011年第1期37-41,共5页
The mechanism of the leaching process of chalcopyrite concentrate with sodium nitrate in sulphuric acid solution were studied and discussed. Chemical reactions of leaching and their thermodynamic probabilities are pre... The mechanism of the leaching process of chalcopyrite concentrate with sodium nitrate in sulphuric acid solution were studied and discussed. Chemical reactions of leaching and their thermodynamic probabilities are predicted based on the calculated Gibbs energies and analysis of E-pH diagrams. Experimental data, thermodynamic analysis, chemical, XRD, and SEM/EDX analyses of concentrate and the leach residues, were performed to develop a better understanding of the chemical reactions that took place in the system. Elemental sulphur was formed as the main leaching product, precipitated at the particle surfaces and tended to inhibit the leaching rate. 展开更多
关键词 CHALCOPYRITE leaching mechanism sulpruric acid sodium nitrate.
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Electrochemical mechanism of rusticyanin (Rus.) isolated from A.ferrooxidans measured by Rus.-ZnS-QDs/L-Cys/Au electrode
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作者 孙静 余润兰 +3 位作者 苗雷 钟代立 刘杰 顾帼华 《Journal of Central South University》 SCIE EI CAS 2011年第5期1389-1394,共6页
Electrochimcal behaviors of rusticyanin (Rus.) isolated from Acidithiobacillus ferrooxidans were investigated through Rus.-ZnS-QDs/L-Cys/Au electrode. The cyclic voltammetric results indicate that rusticyanin immobi... Electrochimcal behaviors of rusticyanin (Rus.) isolated from Acidithiobacillus ferrooxidans were investigated through Rus.-ZnS-QDs/L-Cys/Au electrode. The cyclic voltammetric results indicate that rusticyanin immobilized on the surface of Rus.-ZnS-QDs/L-Cys/Au electrode can undergo a direct quasi-reversible electrochemical reaction. The immobilized rusticyanin is not denatured and still retains its activity in the temperature range of 19-43 ℃. The reduction ability of the protein increases and its oxidation ability becomes weak with the increase of pH from 6.0 to 7.8. Fe^2+ ions in the solution can promote the electron transfer kinetics of the immobilized rusticyanin and make its peak potentials (φp) markedly move negatively. 展开更多
关键词 rusticyanin acidithiobacillusferrooxidans cyclic voltammetry ELECTROCHEMISTRY
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