锌
合金
催化作用
铜
傅里叶变换红外光谱
X射线吸收光谱法
化学工程
无机化学
甲醇
化学
吸收光谱法
有机化学
量子力学
物理
工程类
作者
Maxim Zabilskiy,Vitaly L. Sushkevich,Mark A. Newton,Jeroen A. van Bokhoven
出处
期刊:ACS Catalysis
日期:2020-11-20
卷期号:10 (23): 14240-14244
被引量:35
标识
DOI:10.1021/acscatal.0c03661
摘要
The mechanism of carbon dioxide hydrogenation to methanol over Cu/ZnO materials has been explored for decades; however, the question of the active site still remains open to discussion. We used operando time-resolved X-ray absorption spectroscopy (XAS) and time-resolved isotope labeling experiments coupled with Fourier transform infrared (FTIR) spectroscopy and mass spectrometry (MS) analysis to elucidate the reaction mechanism and study the active sites and intermediates over a Cu/ZnO catalyst during carbon dioxide conversion into methanol. No reduction of the zinc oxide or formation of a copper–zinc alloy was observed even under highly reducing conditions (15 bar of hydrogen, 260 °C), which leads to the conclusion that a copper–zinc alloy phase is not required for high methanol yields and selectivity to be obtained. We attribute the reactive superiority of the copper–zinc-based system to the interplay between copper and zinc oxide phases. Our synthesis protocol provides a way to produce this copper–zinc oxide interface, without having to go through an alloy phase.
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