Oxidative Coupling of Methane over SrO Deposited on Different Commercial Supports Precoated with La2O3
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- 作者：V. R. Choudhary ; S. A. R. Mulla ; and B. S. Uphade
- 刊名：Industrial & Engineering Chemistry Research
- 出版年：1998
- 出版时间：June 1998
- 年：1998
- 卷：37
- 期：6
- 页码：2142 - 2147
- 全文大小：148K
- 年卷期：v.37,no.6(June 1998)
- ISSN：1520-5045
文摘
The influence of catalyst carrier or support (with differentchemical compositions and surfaceproperties), catalyst deposition method (viz., impregnation andcoating), precursor for strontiumoxide (SrO; Sr-nitrate, acetate, hydroxide, and carbonate), and loadingof SrO and lanthanumoxide (La2O3; 0-25 wt %) on the surfaceproperties and performance of catalyst in oxidativecoupling of methane (OCM; at 850 
ntities/deg.gif">C, gas hourly space velocity =1.02 × 105cm3·g-1·h-1andCH4/O2 = 4 or 16) was thoroughlyinvestigated. The basicity, acidity, and O2chemisorption ofthe catalysts were studied by the temperature programmed desorption(TPD) of CO2, NH3, andO2, respectively, from 50 to 950 ntities/deg.gif">C. The total andstrong basic sites, acidity, and OCM activityof the supported catalyst were strongly influenced by the support usedand also by the La2O3loading on the support. The catalyst with a sintered low surfacearea porous silica-aluminasupport and high (20 wt %) La2O3 and SrOloadings showed the best performance in the OCMprocess. The OCM activity was influenced by SrO loading, but to asmaller extent, and also bythe method of SrO deposition. The OCM activity of the supportedcatalysts could be related totheir strong basic sites (measured in terms of the CO2desorbed between 500 and 950 ntities/deg.gif">C).
ntities/deg.gif">C, gas hourly space velocity =1.02 × 105cm3·g-1·h-1andCH4/O2 = 4 or 16) was thoroughlyinvestigated. The basicity, acidity, and O2chemisorption ofthe catalysts were studied by the temperature programmed desorption(TPD) of CO2, NH3, andO2, respectively, from 50 to 950 ntities/deg.gif">C. The total andstrong basic sites, acidity, and OCM activityof the supported catalyst were strongly influenced by the support usedand also by the La2O3loading on the support. The catalyst with a sintered low surfacearea porous silica-aluminasupport and high (20 wt %) La2O3 and SrOloadings showed the best performance in the OCMprocess. The OCM activity was influenced by SrO loading, but to asmaller extent, and also bythe method of SrO deposition. The OCM activity of the supportedcatalysts could be related totheir strong basic sites (measured in terms of the CO2desorbed between 500 and 950 ntities/deg.gif">C).