Positron Annihilation Study of Mo Dispersion in MoO3/Al2O3 Catalysts

摘要：

MoO3/Al2O3 catalysts were prepared by the impregnation method. The pore structure and dispersion of Mo inside the pores in Al2O3 were studied using positron annihilation lifetime spectra (PALS) and coincidence Doppler broadening (CDB) spectra. The PALS measurement revealed two long lifetime components related with positronium annihilation. This suggests that there are two types of pores with different size in the Al2O3 support. It is found that Mo species are mainly dispersed inside the large pores of the support after MoO3 was loaded, which leads to the decrease of the pore volume. As the MoO3 loading exceeds 18％, the size of the large pores is decreased to the similar size of the small pores.

作者: H.J.Zhang D.Wang Z.Q.Chen S.J.Wang Y.M.Xu X.H.Luo

作者单位: Department of Physics,Wuhan University,Wuhan 430072,P.R.China Fushun Research Institute of Petroleum and Petrochemicals,SINOPEC,Fushun 113001,P.R.China

会议类型: 国际会议

会议名称: 第九届国际正电子与正电子素国际会议(9th International Workshop on Positron and Positronium Chemistry)(PPC–9)

会议地点: 武汉

会议语种:英文

页码: 130

在线出版日期: 2008-05-11（万方平台首次上网日期，不代表论文的发表时间）