Reducible carrier supported Au catalyst activities of Co- precipitation prepared MnxCe1-xOy sample and the supported Au catalyst for carbon monoxide oxidation
GAO Li- ping
Science and Technology Information Department, Center Iron and Steel Research Institute, Beijing 100081, China
Abstract:Co- precipitation method prepared MnxCe1-xOy mixed powder was used to prepare the Au catalyst with deposition- precipitation method. The weight ratio of Au was 1. 5% (mass fraction). The catalytic activity was tested by carbon monoxide oxidation. The performance of the samples was characterized by temperature progress reduction (H2- TPR), nitrogen adsorption- desorption, X- ray diffraction (XRD) and oxygen temperature progress desorption (O2- TPD). The test results suggested that the introduction of Au particles largely enhanced the activity of the catalyst. Before the gold was supported, the catalytic activity of MnxCe1-xOy sample was promoted by the increase of manganese oxide content. After supported with gold, the orderliness of catalytic activity was greatly altered. The Au/CeO2 sample had the better activity. The catalytic activities of Au/MnxCe1-xOy samples were decreased with the advance of manganese oxide content. The characteristic results illustrated that the introduction of gold did not destroy the porosity of the supports but changed the chemical state of manganese oxide. The particle of Au highly dispersed on the surface of support, embarrassed the reduction of manganese and cerium components by overcastting the supports surface. The interaction between MnOx and CeO2 was thus disturbed. The large amount of active oxygen spices could provide to Au active site since the increase of CeO2 with lattice oxygen, leading to the high activity of catalyst.
收稿日期: 2018-04-02
出版日期: 2018-07-03
通讯作者:
高丽平
E-mail: gaolp@chinamet.cn
引用本文:
高丽平. 可还原性载体担载金催化剂低温CO氧化的研究[J]. , 2018, 25(3): 12-16.
GAO Li- ping. Reducible carrier supported Au catalyst activities of Co- precipitation prepared MnxCe1-xOy sample and the supported Au catalyst for carbon monoxide oxidation. , 2018, 25(3): 12-16.