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Positron annihilation study of Mo dispersion in MoO3/Al2O3 catalysts

Zhang Hong-Jun Wang Dong Chen Zhi-Quan Wang Shao-Jie Xu You-Ming Luo Xi-Hui

Positron annihilation study of Mo dispersion in MoO3/Al2O3 catalysts

Zhang Hong-Jun, Wang Dong, Chen Zhi-Quan, Wang Shao-Jie, Xu You-Ming, Luo Xi-Hui
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Publishing process
  • Received Date:  21 April 2008
  • Accepted Date:  22 May 2008
  • Published Online:  20 November 2008

Positron annihilation study of Mo dispersion in MoO3/Al2O3 catalysts

  • 1. (1)武汉大学物理科学与技术学院,武汉 430072; (2)中国石化抚顺石油化工研究院,抚顺 113001

Abstract: A series of MoO3/Al2O3 catalysts was prepared by the impregnation method. The positron annihilation lifetime spectra(PALS)and coincidence Doppler broadening (CDB) spectra of the samples were measured to study the pore structure and dispersion of MoO3. The PALS result shows that there are two types of pores with different size in the Al2O3 support. After MoO3 was loaded in the support, Mo species are mainly dispersed inside the large pores of the support, and thus decrease the volume of the large pores. The CDB spectrum shows significant change while MoO3 loading is just 3%. This indicates that the Mo species are dispersed into the pores, and cause the change of the electron momentum distribution seen by positrons. As the MoO3 loading exceeds 18%, the size of the large pores is decreased to the similar size of the small pores, and the positron annihilation parameters show nearly no change with further Mo loading, which indicates saturation of the dispersion of Mo species.

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