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首页> 外文期刊>Catalysis science & technology >Influence of adsorption strength in aqueous phase glycerol hydrodeoxygenation over Ni@Pt and Co@Pt overlayer catalysts
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Influence of adsorption strength in aqueous phase glycerol hydrodeoxygenation over Ni@Pt and Co@Pt overlayer catalysts

机译：在水相吸附强度的影响甘油hydrodeoxygenation Ni@Pt和Co@Pt覆盖物催化剂

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摘要

Silica-alumina supported bimetallic overlayer catalysts of platinum on nickel (Ni@Pt) and platinum on cobalt (Co@Pt) were synthesized using the directed deposition technique. Hydrogen chemisorption and an ethylene hydrogenation descriptor reaction were used to study the adsorption strength of platinum overlayer compared to pure platinum. Decreased hydrogen heats of adsorption from H-2 chemisorption were observed for overlayer catalysts compared to pure platinum, consistent with computational predictions. Ethylene hydrogenation reactivity decreased for overlayer catalysts compared to pure Pt which also implies weakened hydrogen binding of overlayer catalysts. In aqueous phase glycerol hydrodeoxygenation, overlayer catalysts showed higher hydrocarbon production rates per active site compared to their monometallic counterparts and bimetallic alloy samples, likely due to the decreased adsorption strength on Pt overlayer so that less Pt active sites were blocked by strongly adsorbed species such as H-2 and CO. For reactions where strong product binding has been shown to inhibit the reaction, the weakened binding associated with the overlayer catalysts should result in increased activity.
机译：矽支持双金属覆盖物催化剂的铂镍(Ni@Pt)和铂钴(Co@Pt)合成使用定向沉积技术。化学吸收作用和乙烯加氢描述符的反应被用来研究吸附铂覆盖物的力量相对于纯铂。热氢吸附的化学吸收作用观察覆盖物催化剂相比,纯铂、与计算一致预测。减少对覆盖物催化剂相比纯Pt也意味着削弱氢绑定覆盖物的催化剂。甘油hydrodeoxygenation,覆盖物的催化剂显示更高的利率/烃生产活性位点相比单本位制的同行和双金属合金样品,可能由于Pt的吸附强度下降覆盖物,以便减少Pt活跃的网站被强烈吸附物种如2和有限公司反应强烈的产品绑定可以抑制反应,削弱了绑定的覆盖物催化剂会导致增加活动。

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