Photocatalytic reduction of CO2 to CO over the Ti–Highly dispersed HZSM-5 zeolite containing Fe
Photocatalytic reduction of CO2 to CO over the Ti–Highly dispersed HZSM-5 zeolite containing Fe
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DOI：
10.1016/j.apcatb.2016.10.065
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发表时间：
2017-04
影响因子：
22.1
通讯作者：
Y. Tong;Lu Chen;Shangbo Ning;Na Tong;Zizhong Zhang;Huaxiang Lin;Fuying Li;Xuxu Wang
中科院分区：
文献类型：
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作者：
Y. Tong;Lu Chen;Shangbo Ning;Na Tong;Zizhong Zhang;Huaxiang Lin;Fuying Li;Xuxu Wang
本论文选择在光催化还原CO2反应中表现出高效、稳定的含铁HZSM-5分子筛，采用溶胶-凝胶法制备了Ti-HZSM-5杂化材料。XRD、UV-vis DRS、拉曼和XPS表征表明，钛物种以纳米团簇或单点形式高度分散在HZSM-5分子筛表面。与普通TiO 2-HZSM-5复合样品相比，Ti-HZSM-5样品具有更高的激发态电子浓度和更快的电子转移速率，从而提高了光催化还原CO2的活性。Ti含量为0.99wt%的Ti-HZSM-5样品具有最高的光催化还原CO2的速率。光电流和ESR的表征结果表明，Ti物种和Fe物种在紫外光照射下协同作用，从而提出了Ti-HZSM-5上CO2光还原的可能反应机理。本工作突出了沸石中的Fe-O物种与半导体杂化以增强光催化性能的良好前景。
Iron-containing HZSM-5 zeolite, which was shown as an efficient and stable photocatalyst for photocatalytic CO2reduction in our previous research, was chosen to prepare a Ti-HZSM-5 hybrid via sol-gel method. The characterizations by XRD, UV–vis DRS, Raman, and XPS demonstrate that Ti species highly dispersed as nanoclusters or mono-sites on the HZSM-5 zeolite surface. Compared with the common TiO2-HZSM-5 composite sample, the as-prepared Ti-HZSM-5 sample exhibits an enhanced activity for photocatalytic CO2reduction due to higher concentration of excited state electrons and faster electron transfer rate. The Ti-HZSM-5 sample with 0.99 wt% of Ti content is observed to have the highest rate for the photocatalytic CO2reduction. And the characterization results of photocurrent and ESR reveal that Ti species and Fe species work synergistically upon UV-light irradiation, therefore, we propose a possible reaction mechanism of CO2photoreduction on Ti-HZSM-5. This work highlights the promising prospect of hybridizing of the Fe-O species in zeolite with semiconductors for enhanced photocatalytic performance.