Abstract: The presence of sulfur compounds resistant to hydrogenolysis complicates the production of commercial diesel and marine fuels with low sulfur content. This study examines the effect of catalyst composition and temperature (110–150°C) on the low-temperature oxidative removal of benzothiophene (BT) and dibenzothiophene (DBT) from hexadecane (model feedstock) using carbon nanotubes (CNTs) and nitrogen-doped carbon nanotubes (N-CNTs), as well as Pd-based catalysts supported on them, with oxygen as the oxidant. The catalytic oxidation of BT to sulfone (BT-SO2) showed a positive effect of both nitrogen doping of CNTs and the introduction of small amounts of Pd (0.2 wt %), which stabilized atomic/clustered palladium species on pyridine-like nitrogen centers (Pd2+–NPy). Most of the BT-SO2 formed during the experiment (6 h) underwent thermal decomposition or oxidation with SO2 release, reducing the need for an additional sulfone extraction step in diesel fuel processing. In the catalytic oxidation of DBT to sulfone, nitrogen doping of CNTs had no effect. The highest DBT conversion to sulfone and its further oxidation were observed in the presence of the 0.2 wt % Pd/CNT catalyst, in which palladium was present as nanoparticles with a size of 1.1 nm.

Cite: Salnikov A.V. , Svintsitskiy D.A. , Podyacheva O.Y. , Yashnik S.A.
Low-Temperature Oxidative Removal of Sulfur Compounds from Hydrocarbon Fuel over Pd Catalysts Supported on Carbon Nanotubes
Kinetics and Catalysis. 2025. V.66. N1. P.28-42. DOI: 10.1134/s002315842460192x WOS Scopus РИНЦ AN

Dates:

Submitted:	Jul 5, 2024
Accepted:	Jan 23, 2025
Published print:	Feb 1, 2025
Published online:	Jun 3, 2025

Identifiers:

Web of science:	WOS:001502103900010
Scopus:	2-s2.0-105007159036
Elibrary:	82395808
Chemical Abstracts:	2025:1294936

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