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热分解率(TGA)评定汽油清净剂控制发动机沉积物的理论和实践
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作者 郑霞君 宋安 +1 位作者 马其华 赵超 《小型内燃机与摩托车》 CAS 北大核心 2011年第5期35-38,共4页
阐述了依据清净剂及其加剂汽油的热稳定性预测其控制发动机沉积物的可行性。用热分解率(TGA)从购自汽车售后市场8款清净剂中挑选2款特定热稳定性的清净剂,分别按规定浓度添加在2台试验车的汽油中进行1000 km道路试验。结果表明,这2款清... 阐述了依据清净剂及其加剂汽油的热稳定性预测其控制发动机沉积物的可行性。用热分解率(TGA)从购自汽车售后市场8款清净剂中挑选2款特定热稳定性的清净剂,分别按规定浓度添加在2台试验车的汽油中进行1000 km道路试验。结果表明,这2款清净剂控制CCD、IVD及PFID的实际效能与其由TGA热稳定性预测的清净效能完全吻合,因此TGA能有效取代清净剂台架试验评定。 展开更多
关键词 热分解率(TGA) 汽油清净剂 热稳定性(TDP) 发动机沉积物
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二元化合物熔化时的热分解率与其在相图中峰顶的曲率半径的关系 被引量:3
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作者 龚德兴 《天津理工学院学报》 2000年第2期25-27,共3页
根据相图中化合物峰项的曲率半径 ,可以知道化合物的热稳定性 ,本文导出AB型和A2 B型化合物熔化时的分解率与相图中峰顶处的曲率半径的定量关系 .
关键词 相图 半径 二元化合物 热分解率 熔化
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HEDP的热分解特性及其阻垢性能评价 被引量:3
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作者 曾彬 李茂东 +3 位作者 朱志平 张辉 赵军明 杨波 《工业水处理》 CAS CSCD 北大核心 2013年第6期47-50,共4页
研究了有氧、无氧条件以及不同pH条件下羟基亚乙基二膦酸(HEDP)在模拟工业锅炉炉水中的热分解特性,采用电导法和静态阻垢法对HEDP阻碳酸钙垢的性能进行了评价。实验结果表明,有氧和无氧条件下的HEDP热分解特性有较大的区别,pH对HEDP的... 研究了有氧、无氧条件以及不同pH条件下羟基亚乙基二膦酸(HEDP)在模拟工业锅炉炉水中的热分解特性,采用电导法和静态阻垢法对HEDP阻碳酸钙垢的性能进行了评价。实验结果表明,有氧和无氧条件下的HEDP热分解特性有较大的区别,pH对HEDP的热分解影响较小;电导法与静态阻垢法对阻垢剂阻CaCO3垢的评价结果具有一致性;溶液中加入5 mg/L HEDP即可达到较高的阻垢率;温度对阻垢剂的阻垢性能有较大的影响;在较低的钙离子和碳酸氢根离子浓度下,HEDP有较好的阻垢效果。 展开更多
关键词 羟基亚乙基二膦酸 热分解率 电导 静态阻垢法
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添加剂对钛酸铝低膨胀陶瓷热稳定性影响 被引量:11
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作者 薛明俊 孙承绪 《华东理工大学学报(自然科学版)》 CAS CSCD 北大核心 2001年第1期76-79,共4页
通过计算晶格常数和热分解率 ,研究了添加剂莫来石和氧化铁对钛酸铝陶瓷热分解影响的机理。实验结果表明 ,莫来石通过挤压作用 ,而氧化铁通过形成固溶体来抑制钛酸铝陶瓷热分解。莫来石和氧化铁的混合添加剂比单用莫来石抑制效果更好。
关键词 热稳定性 添加剂 钛酸铝陶瓷 晶格常数 热分解率 莫来石 氧化铁 热膨胀系数
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Thermal decomposition and mechanical properties of hydroxyapatite ceramic 被引量:5
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作者 杨春 郭英奎 张密林 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2010年第2期254-258,共5页
Pure hydroxyapatite(HAP)ceramic and HAP composite ceramic with B2O3 were prepared by isostatic press forming and pressureless sintering.The relationships between thermal decomposition ratio and mechanical properties... Pure hydroxyapatite(HAP)ceramic and HAP composite ceramic with B2O3 were prepared by isostatic press forming and pressureless sintering.The relationships between thermal decomposition ratio and mechanical properties for pure HAP ceramic and the composite ceramic were investigated by means of FTIR,X-ray diffraction and three-point bending method.The results indicate that the decomposition ratio of pure HAP ceramic increases with ascending the sintering temperature and nearly reaches 80%at 1 350?殆or the HAP composite ceramic,the thermal decomposition is inhibited obviously due to the addition of B2O3.The added B atoms incorporate into the crystal lattice of HAP to form solid solution,resulting in an enlargement in the crystal spacing and an improvement in the binding strength of HAP crystal cell.Thermal decomposition ratio of HAP decreases but bending strength and fracture toughness are enhanced for HAP composite ceramics.However,when the added B2O3 is more than 5%(mass fraction),HAP decomposition is promoted and a steady?-TCP is formed due to the fact that when B atoms with higher negative electricity are combined with O,sp2 and a full-air p are formed,and those voids have a strong trend to intake of the outer electrons.So,it is very possible to occupy the place where HAP loses OH - or PO4 3- . 展开更多
关键词 B2O3 hydroxyapatite ceramic thermal decomposition bending strength fracture toughness
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Pyrolysis characteristics of rubber compositions in medical waste 被引量:3
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作者 邓娜 王维维 +3 位作者 陈广武 张彦 张于峰 马洪亭 《Journal of Central South University》 SCIE EI CAS 2013年第9期2466-2471,共6页
Thermogravimetric study of rubber compositions (operating glove and catheter) in medical waste was carried out using the thermogravimetric analyser (TGA),at the heating rate of 20 ℃/min in a stream of N2.The resu... Thermogravimetric study of rubber compositions (operating glove and catheter) in medical waste was carried out using the thermogravimetric analyser (TGA),at the heating rate of 20 ℃/min in a stream of N2.The results indicate that the decomposition process of operating glove appears an obvious mass loss stage at 250-485 ℃,while catheter has two obvious stages at 240-510 ℃ and 655-800 ℃,respectively; both samples present endothermic pyrolysis reaction; the decomposition of operating glove and the first mass loss stage of catheter are in agreement with natural rubber pyrolysis; the second mass loss stage of catheter corresponds to CaCO3 decomposition.Based on the experimental results,a novel two-step four-reaction model was established to simulate the whole continuous processes,which could more satisfactorily describe and predict the pyrolysis processes of rubber compositions,being more mechanistic and conveniently serving for the engineering. 展开更多
关键词 medical waste RUBBER operating glove CATHETER PYROLYSIS MODEL
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Photocatalytic activity of CuO nanoparticles incorporated in mesoporous structure prepared from bis(2-aminonicotinato) copper(Ⅱ) microflakes
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作者 Azadeh TADJARODI Omid AKHAVAN Keyvan BIJANZAD 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2015年第11期3634-3642,共9页
An easy method for preparing CuO nanoparticles incorporated in a mesoporous structure was presented based on the thermal decomposition of a copper complex. The novel copper coordination compound of [Cu(anic)<sub>... An easy method for preparing CuO nanoparticles incorporated in a mesoporous structure was presented based on the thermal decomposition of a copper complex. The novel copper coordination compound of [Cu(anic)<sub>2</sub>]&middot;0.75H<sub>2</sub>O (anic= 2-aminonicotinate) with the microflake morphology was synthesized through the reaction of 2-aminonicotinic acid (Hanic) and copper(II) nitrate. Using elemental analysis and Fourier transform infrared (FTIR) spectroscopy, the chemical composition of CuC<sub>12</sub>H<sub>11.5</sub>N<sub>4</sub>O<sub>4.75</sub> was proposed. Calcination process at 550 &deg;C for 4 h transformed the microflakes into CuO nanoparticles incorporated in a mesoporous structure. The FTIR peaks assigned to 2-aminonicotinate were completely removed after calcination, confirming CuO formation. X-ray diffraction (XRD) analysis also confirmed the generation of pure and crystalline CuO. SEM showed CuO nanoparticles with the average diameter of 75 nm. The diffuse reflectance spectrum (DRS) of the CuO nanoparticles showed a band gap energy of &minus;1.58 eV. The degradation efficiency toward rhodamine B was almost 100 % after 5 h illumination when both CuO and H<sub>2</sub>O<sub>2</sub> were utilized. The results show that the product can be used as an efficient photocatalyst for water treatment. 展开更多
关键词 copper oxide NANOSTRUCTURE 2-aminonicotinic acid PHOTOCATALYST thermal decomposition degradation efficiency
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A New Study on Combustion Behavior of Pine Sawdust Characterized by the Weibull Distribution 被引量:2
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作者 Lo Kuo-Chao Wu Keng-Tung +1 位作者 Chyang Chien-Song Ting Wei-The 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2009年第5期860-868,共9页
An isothermal operation is implemented by employing a thermogravimetric analyzer (TGA) for simulating the thermal decomposition behavior of 58μm pine sawdust in air atmosphere.An independent parallel reaction model i... An isothermal operation is implemented by employing a thermogravimetric analyzer (TGA) for simulating the thermal decomposition behavior of 58μm pine sawdust in air atmosphere.An independent parallel reaction model is adopted in this study to describe the thermal decomposition mechanism.The Weibull distribution function is used to record and analyze the weight loss during isothermal decomposition at different temperatures(500,600,700,and 800°C).The total weight loss of the pine sawdust is assumed as a linear combination of individual weight loss from three components,including the char and two volatile matters.The plot of the thermal decomposition rate curve leads to kinetic parameters such as the reaction rate constants and the reaction order.The results show that the Weibull distribution function successfully represents decomposition curves of three components,and fits the experimental data very well.Therefore,this study provides a simple way to evaluate the decomposition rate of biomass combustion in a real combustor. 展开更多
关键词 BIOMASS COMBUSTION Weibull distribution parallel reaction model reaction kinetics
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Reaction pathway and kinetics of CdO nanoparticles prepared from CdCO_3 precursor using thermal decomposition method
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作者 Gholam Reza KHAYATI Seyed Hadi SHAHCHERAGHI +1 位作者 Vahid LOTFI Esmael DAREZARESHKI 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2016年第4期1138-1145,共8页
The non-isothermal kinetics of CdO nanoparticles prepared from CdCO3 precursor using thermal decomposition method was investigated. A model-fitting Malek approach and a model-free advanced isoconversional method of Vy... The non-isothermal kinetics of CdO nanoparticles prepared from CdCO3 precursor using thermal decomposition method was investigated. A model-fitting Malek approach and a model-free advanced isoconversional method of Vyazovkin were applied to the analysis of the DSC and TGA data. The results showed that CdO nanoparticles prepared from CdCO3 followed an autocatalytic reaction. Sestak–Berggren model could favorably describe the studied reaction process. Moreover, the apparent activation energy of CdCO3 decomposition was calculated to be (119.19±9.97) kJ/mol and the explicit rate equation form of CdCO3 decomposition was established. 展开更多
关键词 CdCO_3 CdO nanoparticle kinetic modeling thermal decomposition advanced isoconversional method
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Flow of Burgers' fluid over an inclined stretching sheet with heat and mass transfer 被引量:2
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作者 T.Hayat Sadia Asad A.Alsaedi 《Journal of Central South University》 SCIE EI CAS CSCD 2015年第8期3180-3188,共9页
Effects of heat and mass transfer in the flow of Burgers fluid over an inclined sheet are discussed. Problems formulation and relevant analysis are given in the presence of thermal radiation and non-uniform heat sourc... Effects of heat and mass transfer in the flow of Burgers fluid over an inclined sheet are discussed. Problems formulation and relevant analysis are given in the presence of thermal radiation and non-uniform heat source/sink. Thermal conductivity is taken temperature dependent. The nonlinear partial differential equations are simplified using boundary layer approximations. The resultant nonlinear ordinary differential equations are solved for the series solutions. The convergence of series solutions is obtained by plotting theη-curves for the velocity, temperature and concentration fields. Results of this work describe the role of different physical parameters involved in the problem. The Deborah numbers corresponding to relaxation time(β1 and β2) and angle of inclination(α) decrease the fluid velocity and concentration field. Concentration field decays as Deborah numbers corresponding to retardation time(β3) and mixed convection parameter(G) increase. Large values of heat generation/absorption parameters A/B, and the temperature distribution across the boundary layer increase. Numerical values of local Nusselt number,-θ′(0), and local Sherwood number,-f′(0), are computed and analyzed. It is found that θ′(0) increases with an increase in β3. 展开更多
关键词 Burgers' fluid thermal radiation inclined stretching sheet non-uniform heat source variable thermal conductivity
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基于桐油包膜材料的包膜尿素的研究 (I)包膜材料的FTIR,DTA-TGA研究 被引量:6
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作者 唐辉 王亚明 +1 位作者 张晓春 杨爱明 《云南大学学报(自然科学版)》 CAS CSCD 2004年第2期150-153,共4页
用FTIR和DTA-TGA联用技术研究了桐油包膜尿素中使用的桐油、桐油/无机调理剂混合物的红外吸收特征和热行为,用800℃热分解残重率法测定了包膜材料中桐油聚合物的实际含量.结果表明,包膜中桐油的双键特征吸收明显减少甚至消失,无机调理... 用FTIR和DTA-TGA联用技术研究了桐油包膜尿素中使用的桐油、桐油/无机调理剂混合物的红外吸收特征和热行为,用800℃热分解残重率法测定了包膜材料中桐油聚合物的实际含量.结果表明,包膜中桐油的双键特征吸收明显减少甚至消失,无机调理剂的引入使桐油聚合物在程序升温过程中的放热峰温向高温移动.在包膜率相近的情况下,由含有无机调理剂的桐油包膜材料制备的包膜尿素,包膜材料中桐油聚合物的含量越大,包膜尿素的缓释性就越好. 展开更多
关键词 桐油包膜材料 包膜尿素 热分解残重 FTIR DTA-TGA 缓释性 化肥
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Quantum dot-sensitized solar cells employing Pt/C_(60) counter electrode provide an efficiency exceeding 2%
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作者 YUE GenTian WU JiHuai +4 位作者 XIAO YaoMing LIN JianMing HUANG MiaoLiang FAN LeQing LAN Zhang 《Science China Chemistry》 SCIE EI CAS 2013年第1期93-100,共8页
A microporous platinum/fullerenes (Pt/C 60) counter electrode was prepared by using a facile rapid thermal decomposition method,and the quantum-dot sensitized solar cell (QDSSC) of Pt/C 60-TiO 2-CdS-ZnS and Pt/C 60-Ti... A microporous platinum/fullerenes (Pt/C 60) counter electrode was prepared by using a facile rapid thermal decomposition method,and the quantum-dot sensitized solar cell (QDSSC) of Pt/C 60-TiO 2-CdS-ZnS and Pt/C 60-TiO 2-CdTe-ZnS was fabrication.The technique forms a good contact between QDs and TiO 2 films.The photovoltaic performances of the as-prepared cells were investigated.The QDSSCs with Pt/C 60 counter electrode show high power conversion efficiency of 1.90% and 2.06%,respectively (under irradiation of a simulated solar light with an intensity of 100 mW cm 2),which is comparable to the one fabricated using conventional Pt electrode. 展开更多
关键词 counter electrode quantum dot microporous platinum/fullerenes solar cell
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Experimental Investigation of Pyrolysis Process of Woody Biomass Mixture 被引量:3
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作者 Tijana R.Kosanic Mirjana B.Ceranic +3 位作者 Slavko N.Duric Vojin R.Grkovic Milan M.Milotic Sasa D.Brankov 《Journal of Thermal Science》 SCIE EI CAS CSCD 2014年第3期290-296,共7页
This paper describes an experimental investigation of pyrolysis of woody biomass mixture. The mixture consists of oak, beech, fir, cherry, walnut and linden wood chips with equal mass fractions. During the experiment,... This paper describes an experimental investigation of pyrolysis of woody biomass mixture. The mixture consists of oak, beech, fir, cherry, walnut and linden wood chips with equal mass fractions. During the experiment, the sample mass inside the reactor was 10 g with a particle diameter of 5-10 mm. The sample in the reactor was heated in the temperature range of 24-650℃. Average sample heating rates in the reactor were 21, 30 and 54 ℃/min. The sample mass before, during and after pyrolysis was determined using a digital scale. Experimental results of the sample mass change indicate that the highest yield of pyrolytic gas was achieved at the temperature slightly above 650℃ and ranged from 77 to 85%, while char yield ranged from 15 to 23%. Heating rate has sig- nificant influence on the pyrolytic gas and char yields. It was determined that higher pyrolysis temperatures and heating rates induce higher yields of pyrolytic gas, while the char mass reduces. Condensation of pyrolytic gas at the end of the pyrolysis process at 650℃ produced 2.4-2.72 g of liquid phase. The results obtained represent a starting basis for determining material and heat balance of pyrolysis process as well as woody biomass pyrolysis equipment. 展开更多
关键词 PYROLYSIS woody biomass mixture pyrolysis temperature gas yield
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