A Study of Surface Conversion of Mo03 on γ-A1203 in Physical Mixtures by TDPAC

Chem. J. Chinese Universities ›› 1994, Vol. 15 ›› Issue (8): 1199.

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A Study of Surface Conversion of Mo0₃ on γ-A1₂0₃ in Physical Mixtures by TDPAC

SUN Gui-Da¹, YU Ting-Yun¹, YAN Fu-Shan¹, REN Li-Guo¹, NI Xin-Bo²

1. Departnrent of Petrochemical Engineering, Fushun Petroleum Institute, Fushun, 113001;
2. Shanghai Instrtute of Nuclear Research, Academia Sinica, Shanghai, 201800

Received:1993-10-04 Revised:1994-01-31 Online:1994-08-24 Published:1994-08-24

Abstract

Abstract: The nuclear ctuadrupole interaction of ⁹⁹Mo(β^-)⁹⁹Tc in calcined MoO₃/Y-A1₂0₃ mixtures was measured by time differential perturbed angular correlation (TDPAC) and used for studying the surface conversion of MoO₃ on γ-Al₂O₃ during thermal treatment. MoO₃ on γ-Al₂0₃ surface can be conveted to Mo₇O₂₄^6- (HM)-like Mo species, which can be further converted to the precursor of the active HDS sites (surface polymolybdate species) via the intermediate MoO₂(OH)₂ formed at high temperature. Water vapour with the suitable amount, the time period and temperature of thermal treatment increasing are in favour of the transfor-mation of MoO₃. The presence of excess water vapour inhibits the transformation and with-out water vapour, MoO₃ is difficult to be converted.

Key words: MoO₃, Al₂O₃, Surface reaction, Time differential perturbed angular correlation (TDPAC)

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SUN Gui-Da, YU Ting-Yun, YAN Fu-Shan, REN Li-Guo, NI Xin-Bo. A Study of Surface Conversion of Mo0₃ on γ-A1₂0₃ in Physical Mixtures by TDPAC[J]. Chem. J. Chinese Universities, 1994, 15(8): 1199.

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A Study of Surface Conversion of Mo0₃ on γ-A1₂0₃ in Physical Mixtures by TDPAC

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