Suppressed Strong Metal–Support Interactions in Platinum on Sulfated Titania and Their Influence on the Oxidation of Carbon Monoxide,ChemCatChem

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Suppressed Strong Metal–Support Interactions in Platinum on Sulfated Titania and Their Influence on the Oxidation of Carbon Monoxide
ChemCatChem ( IF 3.8 ) Pub Date : 2018-02-09 , DOI: 10.1002/cctc.201701501
Jaeha Lee ₁ , Inhak Song ₁ , Do Heui Kim ₁

Affiliation

Strong metal–support interactions (SMSI), which are evidenced by the coverage of Pt by the TiO₂ support under reducing conditions, were suppressed upon loading Pt on sulfated TiO₂ (S‐TiO₂), according to controlled CO chemisorption results. Combined X‐ray diffraction (XRD) and X‐ray absorption near‐edge structure (XANES) studies showed that the Pt species interacted more strongly with the sulfur‐free TiO₂ surface than with the sulfated TiO₂ surface, which thereby facilitated the formation of SMSIs at low temperatures. Weakened interactions between Pt and S‐TiO₂ led to the formation of large Pt clusters with more metallic character. CO oxidation on the Pt/S‐TiO₂ and Pt/TiO₂ catalysts revealed that the temperature for 50 % conversion was lower on Pt/S‐TiO₂ than on Pt/TiO₂ by more than 50 °C. It was concluded that the metal–support interactions between Pt and TiO₂ could be controlled by S species on TiO₂, and this ultimately influenced the CO oxidation ability of the catalyst.

中文翻译：

抑制了铂在硫酸二氧化钛上的强金属-载体相互作用及其对一氧化碳氧化的影响

根据受控的CO化学吸附结果，当将Pt负载在硫酸化TiO ₂（S-TiO ₂）上时，可以抑制还原条件下TiO ₂载体对Pt的覆盖，从而证明了较强的金属-载体相互作用（SMSI）。结合X射线衍射（XRD）和X射线吸收近边缘结构（XANES）研究表明，Pt物种与无硫TiO ₂表面的相互作用比与硫酸化TiO ₂表面的相互作用更强，从而促进了形成过程低温下的SMSI。Pt和S-TiO ₂之间的相互作用减弱导致形成了具有更多金属特性的大型Pt团簇。Pt / S‐TiO ₂上的CO氧化Pt / TiO ₂催化剂显示，Pt / S-TiO _2的50％转化温度比Pt / TiO ₂的转化温度低50°C以上。结论是，Pt和TiO ₂之间的金属-载体相互作用可以由TiO ₂上的S物种控制，这最终影响了催化剂的CO氧化能力。

更新日期：2018-02-09

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