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Syngas to lower olefins synthesis over Zn/Al2O3–SAPO-34 hybrid catalysts: role of doped Zr and influence of the Zn/Al2O3 ratio

Abstract

The hybrid catalysts composed of different loadings of Zr-promoted Zn/Al2O3 with SAPO-34 zeolite were investigated for the direct synthesis of lower olefins from syngas in a fixed bed reactor. The different weight ratio of Zn/Al2O3 catalysts and Zr-promoted Zn/Al2O3 catalysts were prepared by co-precipitation method, respectively. The nano sized SAPO-34 zeolite was synthesized by hydrothermal method. The crystallinity, morphology, textural properties and acidic properties of the catalysts were well characterized by XRD, ICP-OES, TEM, H2-TPR, N2 adsorption–desorption isotherms, XPS, and NH3-TPD, respectively. The H2-TPR results suggested that presence of Zr on the surface of the support favors the reducibility of zinc oxides with a shift of lower reduction temperature. The Zr promoter improved the Zn dispersion and enhanced the surface area of Zn/Al2O3 catalysts. Various factors that influenced the catalytic activity, including the reaction temperature, different weight ratio of methanol synthesis catalyst to SAPO-34 zeolite, gas flow rate and stability test were investigated in detail. The hybrid catalysts composed of Zr.Zn/Al2O3 and SAPO-34 showed excellent catalytic performance in activity, selectivity and stability for the conversion of syngas to lower olefins synthesis. When Zr-free Zn/Al2O3 was used for the hybrid catalyst instead of Zr.Zn/Al2O3, the conversion and stability is low. The results show that the synergistic effect existed between the Zr.Zn/Al2O3 component and SAPO-34 zeolite was directly related to the resulting catalytic performance. This study will contribute to the development of efficient catalysts for production of lower olefins from syngas.

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Publication details

The article was received on 20 Mar 2018, accepted on 14 Jun 2018 and first published on 14 Jun 2018


Article type: Paper
DOI: 10.1039/C8CY00574E
Citation: Catal. Sci. Technol., 2018, Accepted Manuscript
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    Syngas to lower olefins synthesis over Zn/Al2O3–SAPO-34 hybrid catalysts: role of doped Zr and influence of the Zn/Al2O3 ratio

    R. G, C. Li, B. Liu, Y. Cheng, F. Meng and Z. Li, Catal. Sci. Technol., 2018, Accepted Manuscript , DOI: 10.1039/C8CY00574E

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