期刊
JOURNAL OF CO2 UTILIZATION
卷 75, 期 -, 页码 -出版社
ELSEVIER SCI LTD
关键词
Nickel-zinc alloy; Dry reforming of methane (DRM); Deactivation; CO 2 utilization; ZnO-ZrO2
This study enhances the performance and stability of a Ni-supported ZrO2 catalyst in the dry reforming of methane by doping with Zn. By adjusting the Ni:Zn:Zr ratio and conducting in situ and ex situ characterizations, it is confirmed that a Ni-Zn alloy is formed under reductive conditions. The resulting catalyst, with tailored morphology of alloy nanoparticles, strong metal-support interactions (ZnO-ZrO2), and additional oxygen vacancies from Zn inclusion, shows 15% higher initial activity and higher stability compared to the Zn-free catalyst.
Stimulated by the capacity of Zn to improve the adoption of CO2 and CH4, we doped a Ni-supported ZrO2 catalyst with Zn to enhance its performance and stability in the dry reforming of methane. We prepared a set of catalysts with different Ni:Zn:Zr proportions and conducted extensive ex situ and in situ characterizations to prove that a Ni-Zn alloy was formed at 750 degrees C under reductive conditions. Combining a tailored morphology of the alloy nanoparticles, strong metal-support (ZnO-ZrO2) interactions, and additional oxygen vacancies created by Zn inclusion resulted in an enhanced catalyst with 15% higher initial activity and higher stability for over 100 h on stream than Zn-free catalyst. Our experimental and modeling results demonstrated that the catalyst with adjusted Ni:Zn:Zr proportion improves the adsorption and reaction rates of CH4 and CO2 while extending its lifetime through enhanced coke precursor gasification compared to its Zn-free counterpart.
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