Synthesis of Light Hydrocarbons via Oxidative Coupling of Methane over Silica-supported Na<sub>2</sub>WO<sub>4</sub>-TiO<sub>2</sub> Catalyst

  • Anusorn Seubsai Kasetsart University
  • Palida Tiencharoenwong Kasetsart University
  • Phattaradit Kidamorn Kasetsart University
  • Chalida Niamnuy Kasetsart University
Keywords: catalyst, light hydrocarbons, oxidative coupling of methane, sodium tungsten oxide, titanium oxide

Abstract

Methane is of great interest for conversion into high-value hydrocarbons (C2+) and olefins, via oxidative coupling of methane (OCM) using catalysts. In this work, Na2WO4-TiO2/SiO2 catalyst, along with the single catalysts of its components (Na2WO4/SiO2 and TiO2/SiO2), was investigated for OCM reaction to C2+. We found that 5 wt% Na2WO4+ 5 wt% TiO2 on the SiO2 support was a superior catalyst for OCM reaction compared to the single catalysts. The maximum C2+ formation of the Na2WO4-TiO2/SiO2 catalyst was found under test conditions of a N2/(4CH4:1O2) feed gas ratio of 1:1, a reactor temperature of 700 ºC, and gas hourly space velocity of 9,500 h−1, exhibiting 71.7% C2+ selectivity, 6.8% CH4 conversion, and 4.9% C2+ yield. Moreover, the activity of the catalyst had good stability over 24 h of on-stream testing. The characterizations of the Na2WO4-TiO2/SiO2 catalyst using XRD, FT-IR, XPS, FE-SEM, and TEM revealed that a crystalline structure of α-cristobalite of SiO2 was present along with TiO2 crystals, substantially enhancing the activity of the catalyst for OCM reaction to C2+.

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Author Biographies

Anusorn Seubsai

Department of Chemical Engineering, Faculty of Engineering, Kasetsart University, Bangkok 10900, Thailand

Center of Excellence on Petrochemical and Materials Technology, Kasetsart University, Bangkok 10900, Thailand

Research Network of NANOTEC–KU on NanoCatalysts and NanoMaterials for Sustainable Energy and Environment, Kasetsart University, Bangkok 10900, Thailand

Palida Tiencharoenwong

Department of Chemical Engineering, Faculty of Engineering, Kasetsart University, Bangkok 10900, Thailand

Phattaradit Kidamorn

Department of Chemical Engineering, Faculty of Engineering, Kasetsart University, Bangkok 10900, Thailand

Chalida Niamnuy

Department of Chemical Engineering, Faculty of Engineering, Kasetsart University, Bangkok 10900, Thailand

Research Network of NANOTEC–KU on NanoCatalysts and NanoMaterials for Sustainable Energy and Environment, Kasetsart University, Bangkok 10900, Thailand

Published In
Vol 23 No 5, Sep 30, 2019
How to Cite
[1]
A. Seubsai, P. Tiencharoenwong, P. Kidamorn, and C. Niamnuy, “Synthesis of Light Hydrocarbons via Oxidative Coupling of Methane over Silica-supported Na<sub>2</sub>WO<sub>4</sub>-TiO<sub>2</sub&gt; Catalyst”, Eng. J., vol. 23, no. 5, pp. 169-182, Sep. 2019.