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    钼/钒-白云石双功能催化剂催化甘油脱水-氢转移制烯丙醇

    Dehydration-hydrogen transfer of glycerol to allyl alcohol over bifunctional molybdenum/vanadium-dolomite catalyst

    • 摘要: 采用浸渍法制备同时具有碱性位点和氧化还原位点的MoO/VO-CD-T(CD为煅烧白云石,T为煅烧温度)双功能催化剂。结果表明,催化剂表面钼/钒氧化物主要由MoO3和V2O5组成;煅烧白云石与钼、钒氧化物之间形成不同的物相,可进一步调节催化剂稳定性和氧化还原性能。在空气气氛下CD-500负载的V2O5催化剂更有利于烯丙醇形成,主要是因为空气中氧气的存在会抑制高价态钒的还原;而CD-500负载钼的氧化物对烯丙醇的活性较低,因为Mo6+的还原能力弱。以质量分数为20% 的甘油溶液为原料,在反应温度为320 ℃的条件下,2% VO-CD-500催化剂(2% 为VO的质量分数)催化性能相对最佳,甘油转化率为52.4%,烯丙醇选择性为37.4%。

       

      Abstract: Bifunctional catalysts MoO/VO-CD-T(CD: calcined dolomite and T: calcined temperature) with both basic sites and redox sites were prepared by impregnation method. The results showed that the molybdenum/vanadium oxides on the catalyst surface were mainly composed of MoO3 and V2O5, and the formation of different phases between calcined dolomite and molybdenum/vanadium oxides could adjust the stability and redox performance of the catalyst. The allyl alcohol was more favorable to be formed over the VO-CD-500 catalyst in air atmosphere, mainly because the oxygen in air could inhibit the reduction of high-valence vanadium. The MoO-CD-500 catalyst had a low activity to allyl alcohol because the reducibility of Mo6+ was weak. 2% VO-CD-500 catalyst showed the best catalytic performance under the condition of 20% glycerol solution and reaction temperature of 320 ℃, with a glycerol conversion of 52.4% and a selectivity to allyl alcohol of 37.4%.

       

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