光催化氮氧化物去除的催化剂活性位点设计研究进展

Progress in Active Sites Engineering of Catalysts for Photocatalytic NOx Removal

光催化技术是一种能够有效去除低浓度氮氧化物的方法。然而,气固相光催化技术存在气体分子吸附活化率低、光能利用率低、光生电子空穴复合率高等问题。催化剂活性位点设计能够有效解决上述问题从而提高催化剂催化活性。本综述简要阐述了光催化氮氧化物去除的反应机理,报道了近年来用于氮氧化物去除的光催化剂表面活性位点设计的研究进展,涉及的活性位点包括金属位点、Lewis位点、缺陷位点以及掺杂位点,最后对光催化氮氧化物的去除进行总结及展望。本文将有助于科研工作者合理设计催化活性位点以发展更高效的光催化剂。

Photocatalytic technique has been considered as a promising method to remove the low concentration of harmful nitrogen oxide(NOx).However,there are still some challenges needed to be tackled,such as poor adsorption and activation of gas molecules,low utilization efficiency of light energy and high recombination rate of photoinduced charge carriers in the gas-solid phase photocatalytic system.The active sites engineering of catalysts is an effective strategy to settle down these obstacles to achieve superior catalytic activity.This report firstly presents the reaction mechanism of photocatalytic NOx removal.Then the most recent advances on the active sites engineering of catalysts including metal,Lewis,defect and doping sites are reviewed.Finally,a brief summary and perspective in this field is discussed.This review will inspire the researchers to develop highly efficient photocatalysts with the rational design of active sites.