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Ta2O5 modified γ-Al2O3 as a methanol dehydration component in the single-step synthesis of dimethyl ether from syngas

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Abstract

Ta2O5 modified γ-Al2O3 samples were prepared by impregnating with tantalum ethoxide, and mixed with methanol synthesis component (Cu/Zn/Al2O3) to form the bi-functional catalysts. They were applied in one step process of dimethyl ether synthesis from syngas. The characterization method of XRD, N2 adsorption, FTIR of adsorbed pyridine, H2-TPR and NH3-TPD and catalyst test were used to measure the impact of Ta2O5 on γ-Al2O3 and bi-functional catalysts. The results revealed that on Ta2O5 modified γ-Al2O3 samples, total number of acid sites increased because of appearance of medium acid sites, which contributed to the dimethyl ether formation and helped enhance the CO conversion. The weak acid strength shifted to weaker leading to a lower initial activation temperature of catalysts, which brought out a higher increment of dimethyl ether selectivity at relatively low temperature (230 °C). 6 wt% Ta2O5 modification was enough to obtain high selectivity and conversion of DME synthesis from syngas.

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Acknowledgments

The aurthors appropriate the financial support from the National Science and Technology Supporting Plan (No. 2007BAA08B04).

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Authors and Affiliations

  1. State Key Laboratory of Chemical Engineering, Engineering Research Center of Large Scale Reactor Engineering and Technology, Ministry of Education, East China University of Science and Technology, Shanghai, 200237, China

    Yunfeng Wang, Haitao Zhang & Weiyong Ying

  2. School of Pharmacy, East China University of Science and Technology, Shanghai, 200237, China

    Hongwei Liu

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  1. Yunfeng Wang
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  2. Hongwei Liu
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  3. Haitao Zhang
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  4. Weiyong Ying
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Correspondence to Weiyong Ying.

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Wang, Y., Liu, H., Zhang, H. et al. Ta2O5 modified γ-Al2O3 as a methanol dehydration component in the single-step synthesis of dimethyl ether from syngas. Reac Kinet Mech Cat 119, 585–594 (2016). https://doi.org/10.1007/s11144-016-1063-0

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  • DOI: https://doi.org/10.1007/s11144-016-1063-0

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