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Ethylene Epoxidation Activity Over Ag-Based Catalysts on Different Nanocrystalline Perovskite Titanate Supports

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Abstract

Ag-based catalysts on different nanocrystalline perovskite supports (MgTiO3, CaTiO3, SrTiO3, and BaTiO3), and nanocrystalline TiO2 support prepared by a sol–gel method and on a commercial α-Al2O3 support were comparatively studied for catalytic activity of the ethylene epoxidation reaction. The dependence of ethylene oxide production performance on calcination temperature of the support, type of titanate nanocrystal supports, Ag loading, and reaction temperature was systematically investigated. The catalysts were analytically characterized by a Brunauer–Emmett–Teller (BET) surface area, X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), energy-dispersive X-ray spectroscopy (EDS), temperature programmed desorption (TPD), and X-ray photoelectron spectroscopy (XPS). Among studied catalysts, the 17.2 wt% Ag/SrTiO3 catalyst exhibited the highest catalytic activity towards ethylene epoxidation reaction.

Graphical Abstract

The long-term stability of the dominant catalysts (which exhibited a high catalytic activity to produce ethylene oxide) was studied at 48 h of time on stream. As shown in the figure, the 17.2 wt% Ag/SrTiO3 catalyst with the support calcination temperature of 923 K is the most effective catalyst for the ethylene epoxidation reaction, giving not only the highest EO selectivity but also providing the highest long-term stability.

EO selectivity as a function of time on stream for 17.2 wt% Ag/SrTiO3 catalyst at the support calcination temperatures of 773 and 923 K compared with 17.1 wt% Ag/BaTiO3 catalyst and a commercial 14.9 wt% Ag/α-Al2O3 catalyst (6 % O2 and 6 % C2H4 balanced with He, a space velocity of 6,000 h−1, a pressure of 24.7 psia, and a reaction temperature of 548 K)

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Acknowledgments

This work was supported by The Royal Golden Jubilee Ph.D. Program (RGJ-Industry) awarded by The Thailand Research Fund with the in-kind support from PTT Global Chemical Public Co. Ltd.; the Sustainable Petroleum and Petrochemicals Research Unit, Center of Excellence on Petrochemical and Materials Technology, Chulalongkorn University (Thailand); and the Transportation Energy Center, Department of Chemical Engineering, University of Michigan (USA).

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Authors and Affiliations

  1. The Petroleum and Petrochemical College, Chulalongkorn University, Soi Chula 12, Phyathai Road, Pathumwan, Bangkok, 10330, Thailand

    Atiporn Chongterdtoonskul & Sumaeth Chavadej

  2. Center of Excellence on Petrochemical and Materials Technology, Chulalongkorn University, Bangkok, 10330, Thailand

    Sumaeth Chavadej

  3. Department of Chemical Engineering, University of Michigan, Ann Arbor, MI, 48109, USA

    Johannes W. Schwank

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  1. Atiporn Chongterdtoonskul
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  2. Johannes W. Schwank
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  3. Sumaeth Chavadej
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Correspondence to Sumaeth Chavadej.

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Chongterdtoonskul, A., Schwank, J.W. & Chavadej, S. Ethylene Epoxidation Activity Over Ag-Based Catalysts on Different Nanocrystalline Perovskite Titanate Supports. Catal Lett 142, 991–1002 (2012). https://doi.org/10.1007/s10562-012-0848-7

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  • DOI: https://doi.org/10.1007/s10562-012-0848-7

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