Metal/acid bifunctional catalysis and intimacy criterion for ethylcyclohexane hydroconversion: when proximity does not matter
Metal/acid bifunctional catalysis and intimacy criterion for ethylcyclohexane hydroconversion: when proximity does not matter
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DOI：
10.1021/acscatal.8b00633
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发表时间：
2018-05
期刊：
影响因子：
12.9
通讯作者：
Ester Gutierrez-Acebo;C. Leroux;C. Chizallet;Y. Schuurman;C. Bouchy
中科院分区：
文献类型：
--
作者：
Ester Gutierrez-Acebo;C. Leroux;C. Chizallet;Y. Schuurman;C. Bouchy
The apparent kinetics in metal/acid bifunctional catalysis is generally strongly affected by the metal to acid site ratio and their proximity. However, these two key parameters have not been systematically investigated in the scientific literature. Such a study is provided here for bifunctional catalysts using platinum as the metallic function and EU-1 zeolite as the acidic function. Two series of bifunctional catalysts with different metal to acid sites ratios and different metal to acid site distances were prepared and tested in ethylcyclohexane hydroconversion. By increasing the metal to acid sites ratio, the catalytic activity and isomerization selectivity increased until a plateau was reached, an observation that is in agreement with the classical bifunctional mechanism. At the same time, the intimacy criterion of Weisz was evaluated: strikingly, for a given metal to acid sites ratio, activities and selectivities are not affected by their distance (up to a micrometer scale). A dual-function kinetic m...
