| 袁伟杰,卢晗锋,张波,陈银飞.铬掺杂对V2O5/TiO2催化氧化3-甲基吡啶合成烟酸性能的影响[J].分子催化,2011,(4):322-327 |
| 铬掺杂对V2O5/TiO2催化氧化3-甲基吡啶合成烟酸性能的影响 |
| Influence of Cr doping on catalytic and oxidation performance of 3-picoline to nicotinic acid on V2O5/TiO2 catalysts |
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| DOI： |
| 中文关键词: 3-甲基吡啶 气相氧化 烟酸 V2O5/TiO2 铬掺杂 |
| 英文关键词:3-picoline gas-phase oxidation nicotinic acid V2O5/TiO2 chromium doping |
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| 中文摘要: |
| 为进一步提高V2O5/TiO2催化剂对气相一步催化合成烟酸反应的活性和选择性。通过浸渍法制备一系列掺杂过渡金属铬的V2O5/TiO2催化剂，并对催化剂进行了BET、XRD、H2-TPR、NH3-TPD表征。结果表明，掺杂Cr后催化剂产生了新晶相CrVO4，减小了V2O5晶粒尺寸，并提高了催化剂的酸性，可较大地提高催化剂活性。少量的Cr掺杂促进了V2O5晶格氧的活动性，可同时提高了烟酸的产率和选择性。但过量Cr掺杂，使催化剂表面氧数量增多，导致选择性出现较大的下降。当在Cr掺杂量2wt%时，260℃的反应温度下烟酸的摩尔产率可达77％。 |
| 英文摘要: |
| In order to improve activity and selectivity of gas phase catalytic oxidation of 3-picoline to nicotinic acid on V2O5/TiO2, a series of V2O5/TiO2 catalysts doped with different Cr content were prepared by impregnation method, and characterized by XRD, BET, H2-TPR, NH3-TPD. The results showed that a new crystalline phase CrVO4 appeared on the Cr-doped catalysts, which reduced V2O5 and TiO2 grain size, and increased the acidity of catalysts. A small amount of Cr doping would promote the activity of the lattice oxygen of V2O5, and improved the yield and selectivity for nicotinic acid. But excessive Cr doping would increase the number of surface oxygen, and lead to a decline in selectivity of nicotinic acid. Yield of Nicotinic acid can reached 77% on V2O5/TiO2 with 2wt% Cr at 260℃. |
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