原位共沉淀法制备Ni-Mg-Al-LDHs/γ-Al2O3催化前驱体在甲烷二氧化碳重整反应体系中的性能评价

doi:10.3866/PKU.WHXB201503111

Abstract

Abstract:

A series of novel catalysts derived from Ni-Mg-Al-LDHs (LDHs: layered double hydroxides) were synthesized in-situ on γ-Al₂O₃ and evaluated in CO₂ reforming of CH₄ (dry reforming of methane, DRM) reaction system. The catalytic precursors were decomposed and reduced by calcination and an atmospheric plasma technique, respectively. Activity and stability tests showed that the catalytic properties were greatly affected by the pretreatment method. The best catalytic performance was obtained with the catalyst that was directly reduced and decomposed using an atmospheric H₂/Ar plasma jet. Compared with the pure LDH precursor, Ni- Mg-Al-LDHs/γ-Al₂O₃ had much greater mechanical strength, because of the γ-Al₂O₃ support. This feature extends the long lifetime of catalyst at high temperatures. X-ray diffraction (XRD), transmission electron microscopy (TEM), N₂-adsorption-desorption, and thermogravimetry-differential thermal analysis (TG-DTA) results showed that the excellent catalytic performance was based on the small particle size and uniform dispersion of active Ni crystals, as well as the high mechanical strength and large specific surface area of the catalyst.

Key words: Dry reforming of methane, Layered double hydroxide, Ni-based catalyst, Catalytic activity, Stability, Coke resistance

MSC2000:

O643

ZHANG Xiao-Qing, XU Yan YAN, YANG Chun-Hui, ZHANG Yan-Ping, YIN Yong-Xiang, SHANG Shu-Yong. In-situ Co-Precipitation of Ni-Mg-Al-LDH Catalytic Precursor on γ-Al₂O₃ for Dry Reforming of Methane: Synthesis and Evaluation[J].Acta Phys. -Chim. Sin., 2015, 31(5): 948-954.

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In-situ Co-Precipitation of Ni-Mg-Al-LDH Catalytic Precursor on γ-Al₂O₃ for Dry Reforming of Methane: Synthesis and Evaluation

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In-situ Co-Precipitation of Ni-Mg-Al-LDH Catalytic Precursor on γ-Al2O3 for Dry Reforming of Methane: Synthesis and Evaluation

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In-situ Co-Precipitation of Ni-Mg-Al-LDH Catalytic Precursor on γ-Al₂O₃ for Dry Reforming of Methane: Synthesis and Evaluation