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Cu-Based mixed metal oxides for an efficient photothermal catalysis of the water-gas shift reaction

机译：铜元素为一个高效的混合金属氧化物水煤气的光热光谱分析催化转变反应

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摘要

Cu-Based catalysts are currently used for the low-temperature water-gas shift (WGS) reaction, where the metallic Cu acts as the main active site. Under light irradiation, the Cu nanoparticles absorb photons, and electrons are promoted to the excited state. Then, the rapid relaxation of those excited electrons further drives the excited lattice phonon mode to generate heat in the local environment. This leads to a relatively high temperature at the catalytic reaction site. Herein, Cu-based catalysts were fabricated, and their catalytic activities for the WGS reaction were tested under the light irradiation of a xenon lamp without any additional heat treatment. Time-dependent temperature monitoring revealed that the temperature reached at 300 degrees C in 3 min, and then stabilized at ca. 350 degrees C for those Cu catalysts, which provided sufficient energy to overcome the energetic barrier and initiate the WGS reaction. Various metal oxides were optimized to function as the support, and Cu-ZnO exhibited the highest photothermal catalytic activity, which could produce 9.5 mmol of H-2 in 30 min and had the CO conversion efficiency as high as 86.8%. The superior catalytic activity was ascribed to the strengthened interaction between the intermediate formate species and the partially oxidized Zn in the Cu-ZnO catalyst.
机译：铜催化剂是目前使用的低温水煤气转移(WGS)反应,金属铜作为主要活跃在哪里网站。纳米粒子吸收光子,电子晋升为激发态。进一步放松的激发电子激动的晶格声子模式在当地环境中产生热量。导致温度相对较高催化反应的网站。催化剂是捏造的,和他们的催化活动的WGS反应进行了测试光线照射的一个没有任何的氙灯额外的热处理。温度监控显示温度达到300摄氏度在3分钟,然后稳定在ca。350摄氏度那些提供的铜催化剂,足够了能量来克服和精力充沛的障碍启动WGS反应。被优化的函数作为支持,Cu-ZnO表现出最高的光热光谱分析催化活性,这可能产生9.5更易30分钟,CO 2的转换效率高达86.8%。催化活性是归因于加强中间间相互作用甲酸物种和部分氧化锌Cu-ZnO催化剂。

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