Acta Phys. -Chim. Sin. ›› 2000, Vol. 16 ›› Issue (05): 464-467.doi: 10.3866/PKU.WHXB20000518

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Studies on Differential Heats H2 Adsorption over γ-Mo2N Catalysts by Microcalorimetry

Zhang Yao-Jun, Xin Qin   

  1. Petroleum Engineering Department,Xi'an Petroleum Institute,Xi'an 710065|State Key Laboratory of Catalysis,Dalian Institute of Chemical Physics,Chinese Academy of Sciences,Dalian 116023
  • Received:1999-07-27 Revised:1999-11-05 Published:2000-05-15
  • Contact: Zhang Yao-Jun

Abstract:

Differential heats of H 2 adsorption on γ-Mo2N catalysts were studied by using microcalorimetry. Samples with high and medium surface areas (90 and 17 m2•g -1 ) present a homogeneous energetic distribution of surface sites, which corresponds with the preferential orientation of their (200) planes. Molybdenum nitride with low surface area (8 m2•g -1 ) displays a heterogeneous energetic distribution of H 2 adsorption sites. The higher initial differential heat of hydrogen adsorption observed for the low surface Mo nitride was attributed to species adsorbed on surface sites associated with the (111) plane.

Key words: γ-Mo2N, Microcalorimetry, Differential heat of H2 adsorption