کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9607861 | 46064 | 2005 | 10 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Low-content gold-ceria catalysts for the water-gas shift and preferential CO oxidation reactions
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کلمات کلیدی
Cerium oxide - اکسید سریمSelective CO oxidation - اکسیداسیون انتخابی COPreferential oxidation of carbon monoxide - اکسیداسیون ترجیحی مونوکسید کربنWater–gas shift - تغییر آب و گازRedox - ردوکس(اکسایش و کاهش)Gold - طلاFuel cells - پیل های سوختیTemperature-programmed reduction - کاهش دما برنامه ریزی شده
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
کاتالیزور
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Low-content (<0.6 at.%) gold-ceria samples were prepared by one-pot synthesis by the urea gelation/co-precipitation method, and by sodium cyanide leaching of high-content (5 at.%) gold-ceria materials prepared by deposition-precipitation. These catalysts, containing cationic gold in ceria, are active for both the low-temperature water-gas shift (WGS) reaction and the preferential oxidation of CO (PROX). The surface oxygen of ceria, as estimated by H2-TPR, was used to normalize the WGS reaction rates. Cyclic temperature-programmed reduction with intermittent reoxidation showed that the surface structures of gold-ceria catalysts are highly reversible. Considerable reoxidation by oxygen or H2O can occur even at ambient conditions. The stability of low-content gold-ceria catalysts for the PROX reaction in a realistic fuel gas mixture containing 1% CO-0.5% O2-50% H2-10% H2O-15% CO2-He was excellent. No drop in activity or selectivity was found in cyclic operation up to 150 °C.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Applied Catalysis A: General - Volume 291, Issues 1â2, 12 September 2005, Pages 126-135
Journal: Applied Catalysis A: General - Volume 291, Issues 1â2, 12 September 2005, Pages 126-135
نویسندگان
Weiling Deng, Janice De Jesus, Howard Saltsburg, Maria Flytzani-Stephanopoulos,