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Phase-dependent enhancement for CO2 photocatalytic reduction over CeO2/TiO2 catalysts

机译：Phase-dependent增强二氧化碳光催化减少了CeO2 /二氧化钛催化剂

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CeO2 is a basic promoter for CO2 photoreduction with H2O over TiO2-based catalysts, but there is still a lack of insight into the interaction of CeO2 with different TiO2 polymorphs and its effect on CO2 photoreduction. In this study, pure anatase, brookite, and rutile TiO2 and their respective hybrids with CeO2 were prepared, and their structural properties, optical properties, interfacial interaction and activity for CO2 photoreduction were systematically studied. The addition of CeO2 improved the activity for CO2 photoreduction under simulated sunlight irradiation, but the improvement depends on the phases of the TiO2. X-ray diffraction, macro-Raman spectroscopic and electron paramagnetic resonance measurements confirm the presence of Ti defects at the CeO2-rutile interfaces, implying a relatively strong interaction between CeO2 and rutile, which is beneficial for the interfacial separation of photogenerated charge carriers. As a result, CeO2/rutile shows the best enhancement of CO2 photoreduction among the studied CeO2/TiO2 systems. Moreover, different paramagnetic species were detected in the three TiO2 polymorphs. The O-radical anion in the anatase lattice could be oxidized to produce Ti3+ under UV-light irradiation, whereas the O-2(-) radical anion on the surface of brookite TiO2 might retard CO production.
机译：CeO2是二氧化碳的基本启动子光致还原作用与水TiO2-based催化剂,但存在仍然缺乏了解的相互作用CeO2二氧化钛多晶型物及其不同影响二氧化碳的光致还原作用。锐钛矿、板钛矿和金红石二氧化钛及其各自的混合动力车与CeO2准备,它们的结构特性、光学特性,界面交互和二氧化碳的活动系统地研究了光致还原作用。添加CeO2提高二氧化碳的活动光致还原作用下模拟阳光取决于辐照,但改进二氧化钛的阶段。macro-Raman光谱和电子顺磁共振测量确认CeO2-rutile Ti缺陷的存在接口,这意味着相对强劲CeO2和金红石之间的交互,这是有益的界面分离的photogenerated运营商收费。CeO2 /金红石显示最好的增强的二氧化碳光致还原作用在研究CeO2 /二氧化钛系统。发现在三个二氧化钛多晶型物。O-radical阴离子的锐钛矿晶格氧化生产Ti3 +紫外线下辐照,而0 2(-)激进的阴离子板钛矿二氧化钛的表面可能会妨碍有限公司生产。

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