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Citation: Wei Zhao-Bin, Wei Cheng-Dong, Xin Qin. Raman Spectroscopic Study of MoO₃/TiO₂-Al₂O₃ Catalyst[J]. Acta Physico-Chimica Sinica, ;1992, 8(02): 261-265. doi: 10.3866/PKU.WHXB19920224 shu

Raman Spectroscopic Study of MoO₃/TiO₂-Al₂O₃ Catalyst

1.
State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023

Received Date: 6 November 1990
Available Online: 15 April 1992

Raman spectrum was used to characterize the structure of Mo species supported on TiO_2-modified Al_2O_3. For Mo/Al_2O_3 without TiO_2 samples the bands at 325-350 cm~(-1) and 930-940 cm~(-1) assigned as tetrahedral MoO_4~(-2), and the bands at 215 and 950 cm~(-1) as octahedral MoO_6~(-6) can be observed at lower MoO_3 loading, while Al_2(MoO_4)_3 phase and crystalline MoO_3 appeared respectively at 370, 1004 cm~(-1) and 822, 991 cm~(-1) when the amount of MoO_3 was beyond one monolayer dispersion on Al_2O_3 surface. As for Mo/TiO_2-Al_2O_3 samples, only octahedral MoO_6~(-6) and crystalline MoO_3, but no tetrahedral MoO_4~(-2) and Al_2(MoO_4)_3 phases had been detected at low or high MoO_3 loadings, even calcination temperature of the samples raised to 973 K, which reveals that TiO_2 covered on Al_2O_3 can weaken the interaction between MoO_3 and Al_2O_3, and inhibits the formation of Al_2(MoO_4)_3 phase. When a definite amount of CoO added into molybdena samples the bands of crystalline MoO_3 disappeared, suggesting that CoO can effectively promote the dispersion of MoO_3 on the carrier. The presence of CoMoO_4 phase was observed in Al_2O_3 or TiO_2-Al_2O_3 carriers.
- LRS; Surface structure of catalyst; Catalyst of Mo/Al₂O₃ and Mo/TiO₂-Al₂O₃; Co-Mo Catalyst
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Raman Spectroscopic Study of MoO3/TiO2-Al2O3 Catalyst

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Raman Spectroscopic Study of MoO₃/TiO₂-Al₂O₃ Catalyst