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Article

Tailoring Properties of Metal-Free Catalysts for the Highly Efficient Desulfurization of Sour Gases under Harsh Conditions

1
Institute of Chemistry and Processes for Energy, Environment and Health (ICPEES), UMR 7515 CNRS-University of Strasbourg (UdS), 25, rue Becquerel, CEDEX 02, 67087 Strasbourg, France
2
Ha-Noi University of Mining and Geology, 18 Pho Vien, Duc Thang, Bac Tu Liem, Ha-Noi 100000, Vietnam
3
Faculty of Chemical Engineering, The University of Da-Nang, University of Science and Technology, 54 Nguyen Luong Bang, Da-Nang 550000, Vietnam
4
Institute of Chemistry of OrganoMetallic Compounds, ICCOM-CNR Via Madonna del Piano, 10, Sesto F.no, 50019 Florence, Italy
5
SICAT SARL, 20 Place des Halles, 67000 Strasbourg, France
*
Authors to whom correspondence should be addressed.
Academic Editor: Daniela Barba
Catalysts 2021, 11(2), 226; https://doi.org/10.3390/catal11020226
Received: 19 January 2021 / Revised: 3 February 2021 / Accepted: 4 February 2021 / Published: 9 February 2021
(This article belongs to the Special Issue Catalysts and Processes for H2S Conversion to Sulfur)
Carbon-based nanomaterials, particularly in the form of N-doped networks, are receiving the attention of the catalysis community as effective metal-free systems for a relatively wide range of industrially relevant transformations. Among them, they have drawn attention as highly valuable and durable catalysts for the selective hydrogen sulfide oxidation to elemental sulfur in the treatment of natural gas. In this contribution, we report the outstanding performance of N-C/SiC based composites obtained by the surface coating of a non-oxide ceramic with a mesoporous N-doped carbon phase, starting from commercially available and cheap food-grade components. Our study points out on the importance of controlling the chemical and morphological properties of the N-C phase to get more effective and robust catalysts suitable to operate H2S removal from sour (acid) gases under severe desulfurization conditions (high GHSVs and concentrations of aromatics as sour gas stream contaminants). We firstly discuss the optimization of the SiC impregnation/thermal treatment sequences for the N-C phase growth as well as on the role of aromatic contaminants in concentrations as high as 4 vol.% on the catalyst performance and its stability on run. A long-term desulfurization process (up to 720 h), in the presence of intermittent toluene rates (as aromatic contaminant) and variable operative temperatures, has been used to validate the excellent performance of our optimized N-C2/SiC catalyst as well as to rationalize its unique stability and coke-resistance on run. View Full-Text
Keywords: mesoporous N-doped carbon coating; silicon carbide composites; gas-tail desulfurization treatment; BTX contaminants; elemental sulfur mesoporous N-doped carbon coating; silicon carbide composites; gas-tail desulfurization treatment; BTX contaminants; elemental sulfur
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MDPI and ACS Style

Duong-Viet, C.; Nhut, J.-M.; Truong-Huu, T.; Tuci, G.; Nguyen-Dinh, L.; Pham, C.; Giambastiani, G.; Pham-Huu, C. Tailoring Properties of Metal-Free Catalysts for the Highly Efficient Desulfurization of Sour Gases under Harsh Conditions. Catalysts 2021, 11, 226. https://doi.org/10.3390/catal11020226

AMA Style

Duong-Viet C, Nhut J-M, Truong-Huu T, Tuci G, Nguyen-Dinh L, Pham C, Giambastiani G, Pham-Huu C. Tailoring Properties of Metal-Free Catalysts for the Highly Efficient Desulfurization of Sour Gases under Harsh Conditions. Catalysts. 2021; 11(2):226. https://doi.org/10.3390/catal11020226

Chicago/Turabian Style

Duong-Viet, Cuong, Jean-Mario Nhut, Tri Truong-Huu, Giulia Tuci, Lam Nguyen-Dinh, Charlotte Pham, Giuliano Giambastiani, and Cuong Pham-Huu. 2021. "Tailoring Properties of Metal-Free Catalysts for the Highly Efficient Desulfurization of Sour Gases under Harsh Conditions" Catalysts 11, no. 2: 226. https://doi.org/10.3390/catal11020226

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