期刊
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
卷 10, 期 5, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jece.2022.108428
关键词
Waste silica gel; Nickel catalyst; Methane reforming; Impregnation; In-situ DRIFTS
资金
- National Natural Science Foundation of China [52106136]
- Fundamental Research Funds for the Central Universities [2242022R20009]
- Scientific Research Starting Foundation for Postdoctoral Researcher of Southeast University
In this study, waste granular silica gel was reused as a nickel-based catalyst support. The Ni/WGSG catalysts showed good performance in the dry reforming of methane (DRM) reaction, with the Ni/WGSG-2 catalyst exhibiting the highest activity. The catalysts also demonstrated good stability under different working conditions.
The waste granular silica gel (WGSG) was reused as nickel-based catalyst support, where the innovation could be reflected in the following aspects: recycling the SiO2 resources to reduce catalyst cost and utilizing the granular shape to skip catalyst molding. The Ni/WGSG catalysts were prepared by a facile one-pot impregnation method and further tested in the dry reforming of methane (DRM) reaction. The physico-chemical properties of the catalysts were also characterized by XRD, H2-TPR, TGA, SEM and TEM. It was found that among the three catalysts with different Ni contents, the Ni/WGSG-2 with medium Ni loading amount showed a comprehensively better activity towards DRM. Under the condition of CO2/CH4 = 1:1 and 900 C, the CO2 and CH4 conversion of Ni/WGSG-2 catalyst could reach 83.6% and 69.5%, respectively, due to its better anti-coking and anti-sintering ability than the other two catalysts. The stability test with varying working conditions showed the Ni/WGSG-2 catalyst can function steadily for 30 h without large deactivation and its average activity is comparable to several Ni catalysts using complex substrates such as carbonized materials and core-shell SiO2. The mechanism inves-tigation via in-situ DRIFTS disclosed that in the process of DRM reaction, consecutive decomposition of adsorbed CH4 molecule to CHx fractions and further to C species was the prerequisite to initiate the reaction and the presence of CO2 could accelerate the above process by forming bridged carbonyls as reaction intermediate.
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