Catalytic activity of flame-synthesized Pd/TiO2 for the methane oxidation following hydrogen pretreatments  

作　　者：Nafeng Wang Fang Niu Shuhao Wang Yun Huang 

机构地区：[1]State Key Laboratory of Multiphase Complex Systems,Institute of Process Engineering,Chinese Academy ofSdences,Beijing 100190,China [2]Institute of Engineering Thermophysics,Chinese Academy of Sciences,Beijing 100190,China

出　　处：《Particuology》2018年第6期58-64,共7页颗粒学报（英文版）

摘　　要：A nanocatalyst composed of 10wt% Pd supported on TiO2 was synthesized using one-step flame spray pyrolysis with a highly-quenched premixed stagnation flame.The as-prepared nanoparticles,having a mean diameter of approximately 10nm,were then subjected to isothermal oxidation and reduction in a fixed bed reactor.The potential roles of Pd and PdO as well as possible synergistic effects between these two active species were explored during methane conversion.The lowest light-off temperature T20 was obtained at a Pd ratio of 53% and this result can be reasonably explained based on a surface Pd-PdO site pair mechanism.Additionally,differences in the hysteresis behavior during methane oxidation were noted throughout a heating-cooling cycle over the temperature range of 200-600℃,such that the degree of hysteresis was strongly correlated with the Pd ratio.

关 键 词：Catalytic oxidation Palladium-based catalysts Flame-assisted spray PYROLYSIS Nanoparticles 

分 类 号：O3[理学—力学]