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Direct Transformation of Syngas to Lower Olefins synthesis over Hybrid Zn-Al2O3/SAPO-34 Catalysts

Abstract

Syngas is a key platform chemical for the utilization of non-petroleum carbon resources. Therefore, a great attention has been paid to the syngas conversion to value added chemicals, such as lower olefins (C2-C4=), liquefied petroleum gas (LPG), gasoline and aromatics. Among these value added chemicals the lower olefins is a promising chemicals, and the direct synthesis of lower olefins from syngas was investigated over a series of hybrid catalysts composed of Zn-M catalysts (M=Al2O3, ZrO2, Cr2O3 and CeO2) and SAPO-34 zeolite. The Zn-M catalysts and different Si/Al ratio of SAPO-34 zeolites were synthesized by co-precipitation and hydrothermal methods, respectively. The aim of the present study the influence of various supports on the catalytic performance of in this reaction. The catalysts were well characterized by X-ray diffraction (XRD), SEM, ICP-AES, BET surface area, NH3-TPD, CO2-TPD, FT-IR, TEM-EDS and H2-TPR techniques. NH3-TPD results showed that with the increase of Si/Al ratio in SAPO-34 zeolite the catalysts exhibit higher acidity due to higher amount of silica content. From the H2-TPR and XRD results suggested that the Zn/Al2O3 catalyst shows strong metal support interactions it is favorable for the higher activity. Various factors that affect the catalytic activity, including reaction pressure, catalysts weight ratio, SiO2/Al2O3 ratio and integration manner of both active components were investigated. These results clearly demonstrated that Si/Al ratio in SAPO-34 catalyst had a predominant effect on lower olefins selectivity. The Zn/Al2O3 with SAPO-34(0.043) catalyst showed excellent lower olefins selectivity (80%). For the integration manner of hybrid catalysts, the highest activity was obtained when the powders of both Zn/Al2O3 and SAPO-34 catalysts was grinded in a mortar for 10 min and pelletized. While the sequential bed and granule mixing of Zn/Al2O3 and SAPO-34 catalyst showed less amount of lower olefins selectivity, indicating that appropriate proximity of active components favor the lower olefins selectivity.

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Publication details

The article was received on 02 Dec 2017, accepted on 07 Feb 2018 and first published on 08 Feb 2018


Article type: Paper
DOI: 10.1039/C7NJ04734G
Citation: New J. Chem., 2018, Accepted Manuscript
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    Direct Transformation of Syngas to Lower Olefins synthesis over Hybrid Zn-Al2O3/SAPO-34 Catalysts

    G. Raveendra, C. Li, Y. Cheng, F. Meng and Z. Li, New J. Chem., 2018, Accepted Manuscript , DOI: 10.1039/C7NJ04734G

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