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首页> 外文期刊>Catalysis science & technology >Effect of nickel on catalytic behaviour of bimetallic Cu-Ni catalyst supported on mesoporous alumina for the hydrogenolysis of glycerol to 1,2-propanediol
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Effect of nickel on catalytic behaviour of bimetallic Cu-Ni catalyst supported on mesoporous alumina for the hydrogenolysis of glycerol to 1,2-propanediol

机译：镍对支持甘油氢解至1,2-丙二醇的介孔氧化铝的双金属Cu-Ni催化剂的催化行为的影响

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摘要

The catalytic conversion of glycerol to 1,2-propanediol by hydrogenolysis has potential use in the commercial biomass industry. However, the high hydrogen pressure required for the reaction is a major drawback. To overcome this limitation, in this study, we added nickel metal to a copper-based catalyst for both supplying hydrogen via aqueous-phase reforming (APR) of glycerol and improving selectivity for 1,2-propanediol in hydrogenolysis. The bimetallic Cu-Ni catalyst supported on mesoporous alumina (MA) was prepared by a sol-gel method. The prepared Cu-Ni catalyst contains ordered mesopores with high surface area and well-dispersed active sites, as confirmed by BET, TEM, XRD, and TPR. The 9Cu-lNi/MA (molar ratio of copper to nickel: 9:1) catalyst showed the highest catalytic performance among the various xCu-yNi/MA catalysts in a low pressure of H2. The XPS results showed that the surface ratio of Ni to (Cu + Ni) and Cu~0/(Cu~0 +-Cu~(2+)) is closely related to catalytic performance, selectivity and yield. The effect of nickel on the hydrogen production was experimentally proven by the time-on-stream tests over monometallic (Cu) and bimetallic (Cu-Ni) catalysts in the absence of hydrogen. The optimum value of the ratio of Ni to Cu is varied with the conditions in the presence of H2. The reaction mechanism was proposed for the Cu-Ni bimetallic catalysts for hydrogenolysis with APR of glycerol.
机译：通过氢解会将甘油催化转化为1,2-丙二醇，在商业生物量行业中可能使用。但是，反应所需的高氢压是主要缺点。为了克服这一局限性，在这项研究中，我们将镍金属添加到基于铜的催化剂中，既可以通过甘油的水相重构（APR）提供氢，又提高了1,2-丙二醇在氢解中的选择性。通过Sol-Gel方法制备了支持介氧氧化铝（MA）的双金属Cu-Ni催化剂。所制备的Cu-Ni催化剂包含有序的中孔，具有高表面积和良好分散的活性位点，如BET，TEM，XRD和TPR所证实的。 9CU-LNI/MA（铜与镍的摩尔比：9：1）催化剂在低压H2的各种XCU-YNI/MA催化剂中显示出最高的催化性能。 XPS结果表明，Ni与（Cu +Ni）和Cu〜0/（Cu〜0 +-cu〜（2+））的表面比与催化性能，选择性和产率密切相关。在没有氢气的情况下，通过一翼（CU）和双金属（CU-NI）催化剂的时间流测试证明了镍对氢生产的影响。在存在H2的情况下，Ni与Cu比率的最佳值随条件而变化。提出了用于用甘油APR的Cu-Ni双金属催化剂的Cu-Ni双金属催化剂。

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