Indexed by:Journal Article

Date of Publication:2017-03-01

Journal:7th China-Japan Workshop on Environmental Catalysis and Eco-Materials

Included Journals:CPCI-S、EI、SCIE

Volume:281

Page Number:512-519

ISSN:0920-5861

Key Words:Au/HZMS-5; Au/SiO2; HCHO oxidation; Treatment atmosphere; Deactivation

Abstract:Au catalysts supported on HZSM-5 and SiO2 prepared by a deposition-precipitation (DP) method with ammonia as the precipitant were very active for HCHO complete oxidation at room temperature under humid air. The treatment atmosphere exerted significant effects on the catalytic performance. The catalysts treated in H-2 had better Au dispersions and smaller Au particle sizes than those treated in air, which were crucial for high reactivity. Both catalysts deactivated at high GHSV (600,000 ml g(-1) h(-1)), due to the growth of Au nanoparticles during the reaction, as well as the accumulation of surface species such as formate intermediates on the catalyst. Our results suggested that small Au particle size and strong metal support interaction were the key factors for the high activity for HCHO oxidation over Au supported on silica-based materials. (C) 2016 Elsevier B.V. All rights reserved.