Nanogold mesoporous iron promoted ceria catalysts for total and preferential CO oxidation reactions
نویسندگان
چکیده
منابع مشابه
Low-content gold-ceria catalysts for the water–gas shift and preferential CO oxidation reactions
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 C...
متن کاملMicrokinetic analysis of water-promoted CO oxidation, water-gas shift, and preferential oxidation of CO on Pt for hydrogen generation
Hydrogen based proton exchange membranes (PEM) fuel cells show good potential for production of electricity. However, widespread commercialization of PEM fuel cells will depend on cheap and environmentally benign production of hydrogen. Currently, hydrogen is mainly produced from syngas by the water-gas shift (WGS) reaction (CO+H2O↔CO2+H2) followed by preferential oxidation (PROX) of CO. Extens...
متن کاملWater-gas Shift Reaction over Ceria-promoted Pt catalysts
Introduction The fuel processor in which hydrocarbon fuels can be converted into hydrogen has recently attracted much attention as a result of the advancement in the fuel cell technology. In a fuel processor, the water-gas shift (WGS) reaction plays a crucial role in the transformation of CO, a well-known poisonous gas to electrode of fuel cell, into hydrogen through reaction with steam. In WGS...
متن کاملPreferential CO oxidation in hydrogen (PROX) on ceria supported catalysts PART II. Oxidation states and surface species on Pd/CeO2 under reac- tion conditions, suggested reaction mechanism
The aim of the PROX reaction is to reduce the CO content of hydrogen feed to proton exchange membrane fuel cells (PEMFC) by selective oxidation of CO in the presence of excess hydrogen. Both Pt and Pd on ceria are active in CO oxidation (without hydrogen) while Pd is poorly active in the presence of hydrogen. In this paper we aimed at finding the reasons of such behavior, using the same techniq...
متن کاملPreferential CO oxidation in hydrogen (PROX) on ceria supported catalysts PART I. Oxidation state and surface species on Pt/CeO2 under reaction conditions
The CO content of hydrogen feed to proton exchange membrane fuel cells (PEMFC) must be kept under 1-100 ppm for their proper operation. This can be achieved by using catalysts able to selectively oxidize CO in the presence of excess hydrogen (PROX). The present study reports on the mechanism of PROX reaction on Pt/CeO2 catalyst, by using catalytic tests, in-situ DRIFTS, high-pressure XPS, HRTEM...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Journal of Molecular Catalysis A: Chemical
سال: 2016
ISSN: 1381-1169
DOI: 10.1016/j.molcata.2016.01.003