Citation: Wen Li, Hongqi Ye, Gonggang Liu, Hongchao Ji, Yonghua Zhou, Kai Han. The role of graphene coating on cordierite-supported Pd monolithic catalysts for low-temperature combustion of toluene[J]. Chinese Journal of Catalysis, ;2018, 39(5): 946-954. doi: 10.1016/S1872-2067(18)63015-3 shu

The role of graphene coating on cordierite-supported Pd monolithic catalysts for low-temperature combustion of toluene

State Key Laboratory for Powder Metallurgy, College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, Hunan, China

Received Date: 13 November 2017
Revised Date: 20 December 2017

Fund Project: This work was supported by the National Natural Science Foundation of China (21276284, 21676303, 21706292).

In the present work, a Pd/graphene/cordierite (Pd/Gr/Cor) composite was prepared as a monolithic catalyst for low-temperature combustion of toluene. We mainly focused on understanding the role of graphene coating through investigation of catalytic performance and adsorption behavior of the composite. Compared with the traditional Pd/Cor catalyst without graphene coating, Pd/Gr/Cor catalyst delivered much higher activity and stability for toluene catalytic combustion in both dry and moist conditions. Transmission electron microscopy (TEM) and hydrophobic characterizations indicated that graphene coating can considerably improve the dispersity of Pd nanoparticles and enhance the hydrophobicity of the cordierite support. The adsorption behavior of the above two catalysts, including adsorption isothermal, adsorption kinetics, and adsorption thermodynamics were carefully investigated. The simulation results indicated that a large amount of toluene was adsorbed on graphene surface through relatively weak interaction, whereas only a relatively small amount of toluene was adsorbed on Pd surface with strong affinity. The adsorption thermal calculation indicated that the adsorption of toluene on graphene was a process with reduced entropy, indicating highly-ordered assembly of toluene molecular on graphene. It is the significant concentration and affinity gap between graphene and Pd that ensures a simultaneously and rapid transfer of toluene during the reaction process.
- Graphene coating,
- Palladium,
- Catalytic combustion,
- Steam,
- Adsorption
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