立方氧化锆
离解(化学)
甲醛
催化作用
四方晶系
单斜晶系
化学工程
吸附
材料科学
漫反射红外傅里叶变换
锆
傅里叶变换红外光谱
化学
光化学
分析化学(期刊)
无机化学
相(物质)
物理化学
晶体结构
结晶学
有机化学
光催化
工程类
陶瓷
作者
Yufei Zhang,Yu Huang,Shuncheng Lee,Junji Cao
标识
DOI:10.1016/j.cej.2019.122498
摘要
The room temperature catalytic efficiency of formaldehyde (HCHO) is determined by interfacial electrons transfer properties, gas adsorption configuration and reactivity of catalysts. The phase-junctions with lattice planes of high matching degree and abundant active sites may do better in the above three aspects than traditional catalysts and their heterojunctions. In this work, tetragonal-monoclinic nano-zirconia (ZrO2) phase-junctions (TMZ) were synthesized for the first time. The highest conversion efficiency of HCHO into CO2 was around 81% at 25 °C exceeded the value for pure ZrO2. Density functional theory calculations and in-situ diffuse reflectance infrared Fourier transform spectroscopy measurements revealed that the adsorption enhancement of rich zirconium sites and single electron activation at TMZ interface caused C–H dissociation of HCHO and hydrogenation of O2 (D–H), significantly lowering the activation barrier of catalytic oxidation of HCHO. Our findings can facilitate further design of more active catalyst for room temperature removal of HCHO.
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