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首页> 外文期刊>Catalysis science & technology >The role of oxophilic Mo species in Pt/MgO catalysts as extremely active sites for enhanced hydrodeoxygenation of dibenzofuran
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The role of oxophilic Mo species in Pt/MgO catalysts as extremely active sites for enhanced hydrodeoxygenation of dibenzofuran

机译：的角色oxophilic Mo物种在Pt /分别催化剂作为增强极其活跃的网站hydrodeoxygenation的氧芴

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摘要

Pt/MoOx/MgO catalysts were prepared with varying Mo coverage and studied for the selective hydrodeoxygenation (HDO) of dibenzofuran (DBF) to biphenyl (BP), aiming at the elucidation of active sites for HDO. Oxophilic Mo species enrich the reducibility of surface Pt and the acidic sites of catalysts, change the product selectivity and then lead to significant improvement of the deoxygenation activity with an excellent HDO reaction rate (1.06 mu mol s(-1) g(-1)) on Pt/7MoO(x)/MgO compared with that (0.04 mu mol s(-1) g(-1)) on Pt/MgO. Moreover, the catalytic performance can be controlled by the MoOx surface density and varied with the increased MoOx surface density in a volcano-shape manner, in which at low Mo coverage (6.19 Mo per nm(2)), crystalline MoO3 particulates may form that is detrimental to the activity. The highest BP yield (100%) was obtained with Pt/7MoO(x)/MgO close to Mo coverage of one monolayer. Furthermore, reactivity studies in combination with density functional theory (DFT) calculations for the adsorption of dibenzofuran and H-2 indicate the synergy of Pt species in affording hydrogen species and adjacent MoOx species in adsorbing/activating C-O bonds suitable for the HDO of DBF.
机译：Pt / MoOx分别准备了不同的催化剂莫有选择性的报道和研究hydrodeoxygenation (HDO)氧芴(DBF)联苯(BP),旨在说明的活跃的HDO网站。Pt和表面酸性的还原性网站的催化剂,改变产品选择性然后导致显著的改进的脱氧活动优秀的HDO反应速率(1.06μ摩尔年代(1)g(1))在Pt / 7 moo (x) /(0.04分别与之相比μ摩尔s (1) g (1)) Pt /分别。可以控制的催化性能MoOx表面密度和不同volcano-shape MoOx表面密度增加方式,在莫覆盖率低( 6.19 Mo / nm (2)),水晶MoO3微粒可能形式有害的活动。(100%)获得了与Pt / 7 moo (x) /分别以接近密苏里州一个单层的报道。反应性研究结合密度泛函理论(DFT)计算的吸附的氧芴和2表示协同的Pt物种提供氢物种和邻MoOx物种适用于吸附/激活切断债券HDO或DBF。

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