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ORIGINAL RESEARCH article

Front. Chem.
Sec. Catalytic Reactions and Chemistry
Volume 12 - 2024 | doi: 10.3389/fchem.2024.1439581
This article is part of the Research Topic Principles behind Catalysis for Energy and the Environment View all articles

Efficient In/SSZ-39 catalysts for the selective catalytic reduction of NO with CH4

Provisionally accepted
Sufeng An Sufeng An 1*Peng Wang Peng Wang 1Kuanling Wang Kuanling Wang 1Xuehai Wang Xuehai Wang 1Baozhong Li Baozhong Li 1Xinwen Guo Xinwen Guo 2*
  • 1 SINOPEC (Dalian) Research Institute of Petroleum and Petrochemicals, Dalian, China
  • 2 Dalian University of Technology, Dalian, Liaoning Province, China

The final, formatted version of the article will be published soon.

    The M/SSZ-39 catalysts (M = In, Co, Cu, Fe) with different metal species and metal loadings were synthesized using the wet impregnation method on a small-pore SSZ-39 molecular sieve. X-ray diffraction (XRD), transmission electron microscopy (TEM), nitrogen adsorption-dehydrogenation and hydrogen temperature program reduction (H2-TPR) were employed to characterize the effects of various metal components and metal loadings on the performance of CH4 selective catalytic reduction of NO reaction (CH4-SCR). The characterization results showed that the In/SSZ-39 catalyst exhibited significantly higher catalytic activity compared to the Cu-, Co-, and Fe/SSZ-39 catalysts, suggesting that indium (In) is a more suitable active ingredient for the CH4-SCR reaction. The xIn/SSZ-39 (x = 1, 2, 3, x represents the In loadings of 1.0 wt%, 2.0 wt% and 3.0 wt%) catalysts, with different In loadings, all present excellent CH4-SCR performance. By varying the In loadings, the type of In species present in the catalyst can be regulated, thus enhancing DeNOx activity and CH4 selectivity in the CH4-SCR reaction. At a low temperature of 400 ℃ and a low CH4/NO feed ratio (CH4/NO = 1), the 3In/SSZ-39 catalyst, featuring highly active InOx clusters, achieves the best low-temperature CH4-SCR performance, with a high NO conversion rate of up to 90% and a CH4 selectivity of up to 74.2%.

    Keywords: CH4-SCR, In/SSZ-39, highly dispersed InOx species, low temperature activation of CH4, high CH4 selectivity

    Received: 28 May 2024; Accepted: 10 Jul 2024.

    Copyright: © 2024 An, Wang, Wang, Wang, Li and Guo. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

    * Correspondence:
    Sufeng An, SINOPEC (Dalian) Research Institute of Petroleum and Petrochemicals, Dalian, China
    Xinwen Guo, Dalian University of Technology, Dalian, 116024, Liaoning Province, China

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