Oxidative desulfurization of diesel fuel catalyzed by polyoxometalate immobilized on phosphazene-functionalized silica

Craven, Michael ORCID: 0000-0002-4590-5319, Xiao, Dong, Kunstmann-Olsen, Casper, Kozhevnikova, Elena F ORCID: 0000-0001-8242-7945, Blanc, Frederic ORCID: 0000-0001-9171-1454, Steiner, Alexander ORCID: 0000-0002-4315-6123 and Kozhevnikov, Ivan V ORCID: 0000-0003-2453-5256 (2018) Oxidative desulfurization of diesel fuel catalyzed by polyoxometalate immobilized on phosphazene-functionalized silica. APPLIED CATALYSIS B-ENVIRONMENTAL, 231. pp. 82-91. ISSN 0926-3373, 1873-3883

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Abstract

Keggin-type polyoxometalates (POM) immobilized on alkylaminophosphazene (RPN)-functionalized silica (POM/RPN-SiO<inf>2</inf>) are new effective single-site solid catalysts for oxidative desulfurization (ODS) of diesel fuel under mild conditions in a biphasic system composed of a benzothiophene-containing model diesel fuel (heptane) and aqueous 30% H<inf>2</inf>O<inf>2</inf>. The catalytic activity of POM/RPN-SiO<inf>2</inf> was found to be influenced by the choice of POM and the amine R group in RPN, decreasing in the order PMo > PW > SiW and Bz > iBu > iPr, respectively. The most effective catalyst, PMo/BzPN-SiO<inf>2</inf> (PMo = PMo<inf>12</inf>O<inf>40</inf>³⁻), exhibited 100% removal of dibenzothiophene from model diesel fuel at 60 °C and ambient pressure and could be reused without loss of activity. This catalyst outperforms other recently reported heterogeneous catalysts for ODS in similar systems. ¹³C, ²⁹Si and ³¹P MAS NMR, FTIR, SEM, BET and elemental analysis were used to characterize the structure of surface phosphazene and POM species in the new catalysts.

Item Type:	Article
Uncontrolled Keywords:	Oxidative desulfurization, Polyoxometalate, Phosphazene, Heterogeneous catalysis
Depositing User:	Symplectic Admin
Date Deposited:	12 Apr 2018 08:24
Last Modified:	06 Jun 2025 01:15
DOI:	10.1016/j.apcatb.2018.03.005
Related Websites:	Author Publisher
URI:	https://livrepository.liverpool.ac.uk/id/eprint/3019374