Citation: Nanli Qiao, Yang Li, Na Li, Xin Zhang, Jie Cheng, Zhengping Hao. High performance Pd catalysts supported on bimodal mesopore silica for the catalytic oxidation of toluene[J]. Chinese Journal of Catalysis, ;2015, 36(10): 1686-1693. doi: 10.1016/S1872-2067(15)60924-X shu

High performance Pd catalysts supported on bimodal mesopore silica for the catalytic oxidation of toluene

1.
Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China

Corresponding author: Jie Cheng,
Received Date: 16 March 2015
Available Online: 11 June 2015
Fund Project: 国家自然科学基金(21337003, 21477149) (21337003, 21477149) 中国科学院战略性先导科技专项(XDB05050200). (XDB05050200)

A series of bimodal mesoporous silica (BMS-x)-supported Pd catalysts were successfully prepared by a facile sol-gel approach, followed by an impregnation method. The synthesized catalysts were characterized by several analytical techniques and the oxidation of toluene was used to evaluate their catalytic performance. Textural analysis showed that all samples had high surface areas (~1000 m²/g), large pore volumes (~1.2 cm³/g) and uniform mesopore size (~2.6 nm). Defining the level of ammonia solution to within a certain range resulted in the catalysts possessing a typical bimodal mesoporous structure with an intraparticle framework mesopore and an interparticle textural mesopore (18-40 nm). Transmission electron microscopy observations and CO chemisorption results revealed that this unique bimodal mesoporous structure helped to decrease the particle size of Pd nanoparticles and could further enhance their dispersion. Activity tests revealed the Pd/BMS-5-Pd/BMS-20 catalysts with a bimodal mesopore structure possessed superior catalytic performance for the oxidation of toluene compared to Pd/BMS-30 with a unimodal mesopore structure. More importantly, compared with the Pd/MCM-41 and Pd/MCM-48 catalysts, Pd/BMS-15 had improved hydrothermal stability and catalytic performance at a high gas hourly space velocity of 70000 h^-1. These results indicate the potential application of the catalysts for the elimination of volatile organic compounds.
- Bimodal mesoporous silica,
- Pore structure,
- Catalytic oxidation,
- Toluene,
- Palladium
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