Oxidative coupling of methane-comparisons of MnTiO3-Na2WO4 and MnOx-TiO2-Na2WO4 catalysts on different silica supports

Worapinit Tiyatha; Thanaphat Chukeaw; Sarannuch Sringam; Thongthai Witoon; Metta Chareonpanich; Günther Rupprechter; Anusorn Seubsai

doi:10.1038/s41598-022-06598-6

Oxidative coupling of methane-comparisons of MnTiO₃-Na₂WO₄ and MnO_x-TiO₂-Na₂WO₄ catalysts on different silica supports

Sci Rep. 2022 Feb 16;12(1):2595. doi: 10.1038/s41598-022-06598-6.

Authors

Worapinit Tiyatha^{1

2}, Thanaphat Chukeaw^{1

2}, Sarannuch Sringam^{1

2}, Thongthai Witoon^{1

2

3}, Metta Chareonpanich^{1

2

3}, Günther Rupprechter⁴, Anusorn Seubsai^{5

6

7}

Affiliations

¹ Department of Chemical Engineering, Faculty of Engineering, Kasetsart University, Bangkok, 10900, Thailand.
² Center of Excellence on Petrochemical and Materials Technology, Kasetsart University, Bangkok, 10900, Thailand.
³ Research Network of NANOTEC-KU on NanoCatalysts and NanoMaterials for Sustainable Energy and Environment, Kasetsart University, Bangkok, 10900, Thailand.
⁴ Institute of Materials Chemistry, TU Wien, 1060, Vienna, Austria.
⁵ Department of Chemical Engineering, Faculty of Engineering, Kasetsart University, Bangkok, 10900, Thailand. fengasn@ku.ac.th.
⁶ Center of Excellence on Petrochemical and Materials Technology, Kasetsart University, Bangkok, 10900, Thailand. fengasn@ku.ac.th.
⁷ Research Network of NANOTEC-KU on NanoCatalysts and NanoMaterials for Sustainable Energy and Environment, Kasetsart University, Bangkok, 10900, Thailand. fengasn@ku.ac.th.

Abstract

The oxidative coupling of methane (OCM) converts CH₄ to value-added chemicals (C₂₊), such as olefins and paraffin. For a series of MnTiO₃-Na₂WO₄ (MnTiO₃-NW) and MnO_x-TiO₂-Na₂WO₄ (Mn-Ti-NW), the effect of loading of MnTiO₃ or MnO_x-TiO₂, respectively, on two different supports (sol-gel SiO₂ (SG) and commercial fumed SiO₂ (CS)) was examined. The catalyst with the highest C₂₊ yield (21.6% with 60.8% C₂₊ selectivity and 35.6% CH₄ conversion) was 10 wt% MnTiO₃-NW/SG with an olefins/paraffin ratio of 2.2. The catalyst surfaces with low oxygen-binding energies were associated with high CH₄ conversion. Stability tests conducted for over 24 h revealed that SG-supported catalysts were more durable than those on CS because the active phase (especially Na₂WO₄) was more stable in SG than in CS. With the use of SG, the activity of MnTiO₃-NW was not substantially different from that of Mn-Ti-NW, especially at high metal loading.

Publication types

Research Support, Non-U.S. Gov't