Jump to main content
Jump to site search

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


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.

Back to tab navigation

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
  •   Request permissions

    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

Search articles by author