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首页> 外文期刊>Catalysis science & technology >Black TiO2-x with stable surface oxygen vacancies as the support of efficient gold catalysts for water-gas shift reaction
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Black TiO2-x with stable surface oxygen vacancies as the support of efficient gold catalysts for water-gas shift reaction

机译：黑色TiO2-x稳定表面氧空位作为有效的金催化剂的支持水气交换反应

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摘要

Exploring appropriate supports is a key step to prepare efficient water-gas shift (WGS) catalysts. In this sense, supports with some oxygen vacancies are preferable, but there have been no efficient methods to obtain abundant stable surface oxygen vacancies. Here, a black TiO2-x support rich in stable surface oxygen vacancies was prepared by hydrogen-etching technology. More impressively, compared with the gold catalyst supported on traditional white TiO2, the gold catalyst supported on black TiO2-x has been proven to be an efficient and stable WGS catalyst. According to the in-depth characterization of its structural properties, the disordered layer and abundant stable surface oxygen vacancies of the black TiO2-x support lead to higher microstrain and more metallic Au-0 species, respectively, which are all in favor of higher WGS catalytic activities. Furthermore, we successfully linked the WGS thermocatalytic activities with the optoelectronic properties, and then tried to understand the WGS pathway from the view of an electron flow process. Hereinto, the Ohmic barrier has been decreased because of the narrowed forbidden band gap, which improves the transmission efficiency of "hot-electron flow". Meanwhile, the abundant surface oxygen vacancies function as electron traps, thus promoting the flow of "hot-electrons" and reduction reaction of H2O. As a consequence, the WGS catalytic activity is enhanced. The involved hydrogen-etching method resulting in abundant stable surface oxygen vacancies can be extended to other supported catalysts for WGS reaction or other thermocatalytic reactions.
机译：探索合适的支持是关键的一步准备有效的水煤气转移(WGS)催化剂。氧空位是可取的,但有没有有效的方法来获取丰富稳定的表面氧空位。TiO2-x支持丰富的稳定表面氧空缺由hydrogen-etching准备技术。金催化剂支持传统的白色二氧化钛,金催化剂在黑色TiO2-x支持已经被证明是一种有效和稳定的WGS催化剂。表征其结构特性,无序层和丰富稳定的表面氧空位的黑人TiO2-x领导的支持更高的微应变和更多的金属Au-0物种,分别都赞成更高的WGS催化活动。成功WGS thermocatalytic有关活动与光电性质,然后试图理解WGS通路一个电子流的过程的观点。欧姆的障碍已经下降,因为禁带缩小差距,提高“热电子的传输效率流”。空置率函数作为电子陷阱,因此促进“热电子”和流动水的还原反应。WGS催化活性增强。hydrogen-etching方法导致丰富稳定的表面氧空位可以扩展为WGS反应或其他受支持的催化剂其他thermocatalytic反应。

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