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首页> 外文期刊>Catalysis science & technology >Confinement of Pt nanoparticles in cage-type mesoporous silica SBA-16 as efficient catalysts for toluene oxidation: the effect of carboxylic groups on the mesopore surface
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Confinement of Pt nanoparticles in cage-type mesoporous silica SBA-16 as efficient catalysts for toluene oxidation: the effect of carboxylic groups on the mesopore surface

机译：监禁的笼式Pt纳米粒子介孔二氧化硅SBA-16高效催化剂甲苯氧化:羧基的影响组织间隙孔表面

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摘要

In this work, 3D cage-type mesoporous silica SBA-16, which is functionalized either with or without -COOH groups, is used to support Pt nanoparticles (NPs) and then applied for toluene oxidation. The -COOH functionalized SBA-16 exhibits higher affinity towards Pt4+ species, and as a result highly dispersed and nanosized Pt nanoparticles are formed in comparison to the case of its counterpart pure silica SBA-16 without -COOH groups. When pure SBA-16 without -COOH is used as the support, on the other hand, Pt NPs are formed outside the mesopores of SBA-16, resulting in larger Pt NPs. The catalytic activity for toluene oxidation over Pt nanoparticles deposited on SBA-16 with -COOH is significantly higher than that on pure SBA-16. The intermediate species, reaction mechanisms and active sites in the course of toluene oxidation are probed by in situ IR spectroscopy of CO and toluene adsorption. The Pt nanoparticles confined in the cage-type mesopores of SBA-16 with -COOH can induce the breakage of the strong C-C bonding between phenyl and methyl groups to form CO and carbonyl intermediates, and thus enhance the catalytic activity for toluene oxidation. The defect sites of Pt particles on SBA-16 with -COOH may play a role in the adsorption and decomposition of toluene. The low reducibility of Pt on SBA-16 results in a poor ability to degrade toluene, thus leading to a low catalytic rate for toluene oxidation.
机译：在这个工作中,3 d笼式介孔二氧化硅SBA-16,功能化的或没有羧基组,用于支持工党纳米颗粒(NPs),然后申请甲苯氧化。展品高亲和力对Pt4 +物种,结果高度分散和纳米Pt纳米粒子形成相比纯硅SBA-16相应的案例没有羧基组。羧基作为支持,另一方面,Pt NPs形成中孔外SBA-16,导致更大的Pt NPs。活动甲苯氧化/ Pt纳米颗粒沉积在SBA-16与羧基明显高于纯SBA-16。中间物种,和反应机制甲苯氧化过程中活跃的网站通过原位红外光谱探测的CO和甲苯吸附。笼式的中孔SBA-16羧基能诱导强烈的碳碳键的断裂苯基甲基形成公司和之间羰基中间体,因此提高甲苯氧化的催化活性。缺陷的Pt粒子与羧基SBA-16在吸附和可能发挥作用甲苯的分解。Pt SBA-16结果在一个贫穷的降解能力甲苯,从而导致催化率较低甲苯氧化。

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