CIESC Journal ›› 2016, Vol. 67 ›› Issue (9): 3692-3698.doi: 10.11949/j.issn.0438-1157.20160283

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Microkinetics analysis of acetylene hydrogenation over Pd/Al2O3 catalyst with different particle sizes

PANG Hongqiang, SUI Zhijun, ZHU Yi'an, ZHOU Xinggui   

  1. State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China
  • Received:2016-03-10 Revised:2016-06-16 Online:2016-09-05 Published:2016-06-16
  • Supported by:

    supported by the National Basic Research Program of China (2012CB720500) and the National Natural Science Foundation of China (21376076).

Abstract:

Pd/α-Al2O3 with different particle sizes were prepared by the incipient wetness method and characterized by BET, XRD, ICP-AES, CO chemisorption and TEM. The kinetic characteristics over these catalysts were explored following a fractional factorial designs of experiment and the experiment results were analyzed by microkinetic method. The size of three catalysts obtained was 1.6 nm, 3.4 nm and 5.5 nm, respectively, as verified by TEM and CO chemisorption results. After stable performance of the catalyst, the exposed surface Pd number of catalysts measured from CO chemisorption agreed well with that of Pd(111) surface calculated from Hardeveld's model. The microkinetic analysis results showed that the microkinetic model can fit the kinetic experiment results quite well on all catalysts. C2H4* and C2H3* were the most abundant surface species independent of the reaction conditions. The rate determining step was the hydrogenation of vinyl group to form ethylene according to the relationship between microkinetic information and macrokinetic characteristics.

Key words: multiphase reaction, acetylene hydrogenation, microkinetic model, particle size effects, catalyst

CLC Number: 

  • TQ032.4

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