Advanced catalytic CO2 hydrogenation on Ni/ZrO2 with light induced oxygen vacancies formation in photothermal condition at medium-low temperatures
发布时间：2025-04-30
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- 发布时间：
- 2025-04-30
- 论文名称：
- Advanced catalytic CO2 hydrogenation on Ni/ZrO2 with light induced oxygen vacancies formation in photothermal condition at medium-low temperatures
- 发表刊物：
- Catalysis Science & Technology
- 摘要：
- Selective CH4 formation from CO2 hydrogenation is an appealing yet challenging in sunlight-driven or thermal-driven process due to low solar energy utilization efficiency or high energy input. Herein, we report an enhanced catalytic CO2 hydrogenation in photothermal condition on Ni/ZrO2 catalyst, which provided a higher performance than “dark” thermal catalysis at medium-low temperatures (≤350 °C). With assistance of sunlight, CO2 conversion and CH4 selectivity were achieved to 82% and 100% at 350 °C over 3 wt% Ni/ZrO2 catalyst which maintained excellent activity and stability for 48 hours during catalyst durability test. The experiment and catalyst characterization results revealed that the illumination stimulated the photothermal effect of Ni and promoted dissociate of H2 conductive to formation of oxygen vacancies in ZrO2. The existed oxygen vacancies provided strong alkaline adsorption of O2- species on the CO2 surface and enhanced the interaction between metal and support, which was beneficial to CO2 activation. The raise of Ni doping amount would increase the catalytic active sites and thermal accumulation centers, resulting in the dramatical increase of CO2 conversion at low temperatures (≤300 ℃), while reduced along with the elevated temperature due to switched reaction state and deposited carbon on the catalysts. Additionally, Density functional theory (DFT) calculations confirmed the experimental observation, showing the oxygen vacancies on ZrO2 facilitate both CO2 adsorption and hydrogen spillover to further enhance CO2 hydrogenation.
- 合写作者：
- Xin Ding, Xu Liu, Jiahui Cheng, Lingzhao Kong, Yang Guo*
- 是否译文：
- 否
- 发表时间：
- 2022-06-13