TAILIEUCHUNG - Water-gas shift reaction on Au/CeO2 catalytic material

Nanostructured Au-Ceria has been known as a promising catalyst for the low-temperature water-gas shisft reaction. The catalyst prepared by coprecipitation method with the gold loading various between 2 - 3 at.% with the crystallite size of nm has been used to study some factors that effect to catalytic activity and long-term stability of this material. | Journal of Chemistry Vol. 41 1 P. 119 -123 2006 WATER-GAS SHIFT REACTION ON Au CeO2 CATALyTIC MATERIAL Received 17 January 2005 LA THE VINH LA VAN BINH Hanoi University of Technology SUMMARy Nanostructured Au-Ceria has been known as a promising catalyst for the low-temperature water-gas shisft reaction. The catalyst prepared by coprecipitation method with the gold loading various between 2 - 3 at. with the crystallite size of nm has been used to study some factors that effect to catalytic activity and long-term stability of this material. I - INTRODUCTION CO oxidation over catalyst was studied and there were also a lot of catalytic materials used for this purpose. This report focus on a new material based on Au CeO2 which has been known as the new catalytic material for the low temperature water-gas shift LTS . The catalyst was prepared by co-precipitation CP from cerium-nitrat solution and gold acid by pH . The gold loading was varied between 2 3 at. with the crystallite size of nm. The catalytic activity correlates well with structure characterization of gold as well as dispersion of gold on ceria. II - EXPERIMENTAl 1. Catalyst preparation The support is suspended in water at 60oC and at pH of - 7. The pH was controlled by adding a Na2CO3 solution. We added goldacid HAuCl4 and kept the pH between and 7 by adding more Na2CO3 solution. After 30 min of stirring the solution is cooled down to room temperature and filtered with a Rotbandfilter. The catalyst is resuspended twice in warm water to diminish the natrium amount after that it is dried in an exicator under vacuum over night and then stored in the dark. Before use the catalyst was conditioned by heating it up to 200oC in N2 and kept at this temperature for 30 minutes in N2 flow. Then the gas flow was switched for 45 minutes to a 10 H2 in N2 mixture and finally it was kept another 30 minutes in a N2 flow. After the conditioning treatment the catalyst is cooled down to reaction .

• Hoá học
• Công nghệ hóa
• Water gas
• Shift reaction on Au CeO2
• Catalytic material
• Hóa vô cơ
• Kinetic measurements
• Kỹ thuật hệ thống công nghệ hóa học
• Hệ thống công nghệ hóa học
• Công nghệ hóa học
• Tối ưu hóa
• Quá trình công nghệ hóa học
• Phương pháp giải thích
• Quy hoạch toán học
• Phương pháp gradient
• Mô hình hóa công nghệ hóa học
• Nghiên cứu công nghệ hóa học
• Mô tả công nghệ hóa học
• giáo trình công nghệ hóa học
• thiết bị công nghệ hóa học
• bài giảng công nghệ hóa học
• công nghệ hóa chất
• tài liệu công nghệ hóa chất
• áp dụng công nghệ hóa chất
• tìm hiểu công nghệ hóa chất
• nghiên cứu công nghệ hóa chất
• công nghệ hóa dầu
• bài giảng công nghệ hóa dầu
• giáo trình công nghệ hóa dầu
• tài liệu công nghệ hóa dầu
• lý thuyết công nghệ hóa dầu