Pd-W and Pd-Mo catalysts for NO decomposition and NO/CO reduction reactions

Journal of the Brazilian Chemical Society

Baibich, Ione M.¹  Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil¹  Dallago, Rogério M.¹  Universidade Regional Integrada do Alto Uruguai e das Missões, Erechim, Brazil¹ 

关键词: NO decomposition;    NO/CO reduction;    palladium/alumina catalyst;    molybdenum;    tungsten;   

DOI  :  10.1590/S0103-50532009000500011

学科分类：化学（综合）

来源: SciELO

【 摘 要 】

Pd/γ-Al2O3 catalysts with two different metal particle sizes were prepared from [Pd(acac)2]. Subsequently, the photochemical reaction of [M(CO)6] (M = Mo or W) in the presence of Pd/γ-Al2O3 was used to prepare bimetallic Pd-M/γ-Al2O3 catalysts. DRIFTS FTIR spectra of the catalyst surfaces prior to thermal decomposition showed unstable subcarbonyl [M(CO)n] species. Chemisorption and CO/NO adsorption results indicated a blockage of the Pd active sites when the second metal was incorporated. The catalytic activity and the selectivity for the NO/CO reaction were higher for Pd with higher particle size, but they were both inhibited when Mo or W were incorporated. On the other hand, when the catalysts were tested for NO decomposition, the presence of Mo or W led to an increase in the catalytic activity, with optimal results observed in the presence of Mo.

【 授权许可】

Unknown