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THE DIFFUSION OF m-XYLENE ON MODIFIED ZnZSM-5 AROMATIZATION CATALYST BEFORE AND AFTER COKING
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作者 Wen Gui GUO Jian Hui WU +2 位作者 Su Qin ZHAO Rong Hui WANG Juan LIANG 《Chinese Chemical Letters》 SCIE CAS CSCD 1993年第1期67-68,共2页
The effect of coking amount for diffusion rate of m—xylene in a pore of the modified ZnZSM—5 aromatization catalyst has been studied.
关键词 MS THE DIFFUSION OF m-XYLENE ON MODIFIED ZnZSM-5 aromatization catalyst BEFORE AND AFTER COKING
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Catalytic behavior in propane aromatization using GA-MFI catalyst
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作者 Alfredo Aloise Enrico Catizzone +2 位作者 Massimo Migliori Janos B.Nagy Girolamo Giordano 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2017年第12期1863-1870,共8页
Ga-Al-MFI samples were synthesized in hydrothermal conditions from gels of composition 1.08CH3NH2- 0.134TPABr-1SiO2-xAl2O3-yGa2O3-40H2O at 175 ℃ for 7 days, with x = 0.005 and 0.0025, y = 0.005, 0,010 and 0.020. The ... Ga-Al-MFI samples were synthesized in hydrothermal conditions from gels of composition 1.08CH3NH2- 0.134TPABr-1SiO2-xAl2O3-yGa2O3-40H2O at 175 ℃ for 7 days, with x = 0.005 and 0.0025, y = 0.005, 0,010 and 0.020. The samples were characterized by XRD, BET measurements, thermal analysis (TGA-DTA) atomic absorption and high resolution solid state MAS 27Al and 71Ga NMR measurements. The aromatization of propane was studied as catalytic test. The activity and selectivity of the catalysts were determined for benzene, toluene and xylenes on the one hand and for methane and ethane on the other hand. The most active sample was obtained with the highest Ga/AI ratio. For this sample, the BTX selectivity obtained by aromatization was always higher than the hydrocracking selectivity leading to methane and ethane. The relative amount of toluene was higher than that of benzene and ofxylenes. The samples were deactivated by coke formation that was revealed more severe for the most active sample, 展开更多
关键词 Propane aromatization Gallium ZSM-5 Coke formation catalyst deactivation
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Asymmetric Reduction of Aromatic Ketone withSufonylamide Catalysts
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作者 Gao-shen Yang Jian-Bing Hu +1 位作者 Gang Zhao Yu Ding (Shanghai institute of organic chemistry,Academia Sinica, 354 Fenglin Shanghai) 《厦门大学学报(自然科学版)》 CAS CSCD 北大核心 1999年第S1期129-129,共1页
The asymmetric borane reduction of carbonyl compounds using chiral catalysts is one of the most active research. Among them,Oxazaborolidines developed by Corey are most significant- Herein. we report the use of sufony... The asymmetric borane reduction of carbonyl compounds using chiral catalysts is one of the most active research. Among them,Oxazaborolidines developed by Corey are most significant- Herein. we report the use of sufonylamides as chiral catalysts to reduce aromatic ketone in high yield and with e.e. of up to 91 %. Scheme: 展开更多
关键词 Asymmetric Reduction of Aromatic Ketone withSufonylamide catalysts
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Condensation of Aromatic Aldehydes with Isopropylidene Malonate or 5,5-Dimethyl-1,3-cyclohexanedion without Catalyst
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作者 Dai Qing SHI Yuan GAO +2 位作者 Lai Laong MU Zai Sheng LU Gui Yuan DAI(Department of Chemistry, Xuzhou Normal University, Xuzhou 221009) 《Chinese Chemical Letters》 SCIE CAS CSCD 1997年第9期755-758,共4页
The condensation of aromatic aldehydes with isopropylidene malonate or 5,5-dimethyl-1,3-cyclohexanedione is carried out by DMF as solvent without catalyst.
关键词 IR HNMR Cl ppm Condensation of Aromatic Aldehydes with Isopropylidene Malonate or 5 5-Dimethyl-1 3-cyclohexanedione without catalyst KBr
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A silica gel supported cobalt(Ⅱ) Schiff base complex as efficient and recyclable heterogeneous catalyst for the selective aerobic oxidation of alkyl aromatics 被引量:2
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作者 Lei Chen Bin-Dong Li +1 位作者 Qiu-Xia Xu Da-Bin Liu 《Chinese Chemical Letters》 SCIE CAS CSCD 2013年第9期849-852,共4页
A silica gel supported cobalt(lI) Schiff base complex was synthesized and used for the oxidation of alkyl aromatics using molecular oxygen as an oxidant under atmosphere pressure. The catalyst shows a high conversio... A silica gel supported cobalt(lI) Schiff base complex was synthesized and used for the oxidation of alkyl aromatics using molecular oxygen as an oxidant under atmosphere pressure. The catalyst shows a high conversion of alkyl aromatics and selectivity to benzylic ketones, and could be reused at least 5 times without significant loss of catalytic activity. 展开更多
关键词 Schiff base complex Aerobic oxidation Alkyl aromatics Supported catalyst
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Immobilization of chiral Rh catalyst on glass and application to asymmetric transfer hydrogenation of aryl ketones in aqueous media
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作者 Tan-Yu Cheng Jing-Lan Zhuang +2 位作者 Hui Yao Huai-Sheng Zhang Guo-Hua Liu 《Chinese Chemical Letters》 SCIE CAS CSCD 2014年第4期613-616,共4页
A chiral catalyst, Cp*RhTsDPEN (Cp* = pentamethyl cyclopentadiene, TsDPEN = substitutive phenylsulfonyl-l,2-diphenylethylenediamine), was synthesized and immobilized at the surface of glass. The immobilized cataly... A chiral catalyst, Cp*RhTsDPEN (Cp* = pentamethyl cyclopentadiene, TsDPEN = substitutive phenylsulfonyl-l,2-diphenylethylenediamine), was synthesized and immobilized at the surface of glass. The immobilized catalyst exhibited good catalytic efficiency for asymmetric transfer hydrogenation of aromatic ketones in water with HCOONa as hydrogen source. 展开更多
关键词 Heterogeneous Rh catalyst Asymmetric transfer hydrogenation Aromatic ketones Glass suhstrate
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Pd-catalyzed ortho-olefination of aromatic acetyl esters
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作者 Lei Xiang Kai Yang Qiu-Ling Song 《Chinese Chemical Letters》 SCIE CAS CSCD 2017年第3期517-520,共4页
A Pd(Ⅱ)-catalyzed ortho-olefination of aromatic acetic esters is described which features with an excellent funcitional group tolerance, good yields, mild reaction conditions, good scalability as well as high chemo... A Pd(Ⅱ)-catalyzed ortho-olefination of aromatic acetic esters is described which features with an excellent funcitional group tolerance, good yields, mild reaction conditions, good scalability as well as high chemo-and regio-selectivity. 展开更多
关键词 ortho-Olefination Aromatic acetyl ester Pd catalyst C–H activation Weak coordination
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