在Ag/ZnO催化剂上通过等离子体辅助的逆水气转换反应实现CO2的高转化率

IF 4.5 3区 工程技术 Q2 ENGINEERING, CHEMICAL
Chunhong Pan, Biao Wang, Jinman Mao, Mengjia Li, Huimin Wang, Wenyi Chen, Feng Gao, Guoping Hu, Xiaolei Fan, Feng Huang
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引用次数: 0

摘要

逆水气转换反应是CO2利用的战略途径。尽管具有潜力,但传统热催化的逆水气转换反应面临着一些挑战,包括热力学限制导致的低平衡转化率、高能耗和产物选择性不足。本研究表明,等离子体与Ag/ZnO之间具有明显的协同作用,可以增强水气倒转反应。等离子体催化体系的CO2转化率为76.5%,CO选择性为96.8%,CO产率为74.1%,能量效率高达0.19 mmol·kJ−1,超过了单独等离子体催化体系和ZnO催化体系。x射线光电子能谱和俄歇电子能谱的结果证实了Ag和ZnO之间存在电子金属支撑相互作用,这有助于形成缺电子的Ag位点和部分还原的ZnOx物质。这些活性位点与还原过程中产生的氧空位一起,增强了H2和CO2的吸附和活化,为改进的逆水气转换反应提供了一个主要的等离子体辅助表面反应途径。这些发现强调了电子金属支撑相互作用在操纵表面环境以促进高效等离子体辅助催化反应中的关键作用,对合理设计能够在温和条件下有效转化二氧化碳的催化剂具有重要意义。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
High CO2 conversion via plasma assisted reverse water-gas shift reaction over Ag/ZnO catalyst

Reverse water-gas shift reaction represents a strategic pathway for CO2 utilization. Despite its potential, reverse water-gas shift reaction via conventional thermal-catalysis faces several challenges, including low equilibrium conversion rates due to thermodynamic constraints, high energy consumption, and insufficient product selectivity. Here, this study demonstrates an evident synergetic effect between plasma and Ag/ZnO, on enhancing reverse water-gas shift reaction. The plasma catalytic system achieved significantly improved performance with a remarkable CO2 conversion rate of 76.5%, a high CO selectivity of 96.8% and a CO yield of 74.1%, along with an energy efficiency as high as 0.19 mmol·kJ−1, surpassing the plasma alone system and ZnO catalytic systems. Results from X-ray photoelectron spectroscopy and Auger electron spectroscopy confirm the presence of electronic metal-support interactions between Ag and ZnO, which facilitates the formation of electron-deficient Ag sites and partially reduced ZnOx species. These reactive sites, along with oxygen vacancies created during reduction treatment, enhance the adsorption and activation of H2 and CO2, offering a dominant plasma-assisted surface reaction pathway for the improved reverse water-gas shift reaction. These findings underscore the crucial role of electronic metal-support interactions in manipulating surface environments to facilitate efficient plasma-assisted catalytic reactions, with significant implications for the rational design of catalysts capable of converting CO2 efficiently under mild conditions.

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来源期刊
CiteScore
7.60
自引率
6.70%
发文量
868
审稿时长
1 months
期刊介绍: Frontiers of Chemical Science and Engineering presents the latest developments in chemical science and engineering, emphasizing emerging and multidisciplinary fields and international trends in research and development. The journal promotes communication and exchange between scientists all over the world. The contents include original reviews, research papers and short communications. Coverage includes catalysis and reaction engineering, clean energy, functional material, nanotechnology and nanoscience, biomaterials and biotechnology, particle technology and multiphase processing, separation science and technology, sustainable technologies and green processing.
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