Bivalent copper oligopyrocatecholate as a novel heterogeneous catalyst for the oxidative degradation of mercaptan in caustic solution: Synthesis, characterization, and kinetic study

Ахмадуллин, Р. М.; Губайдуллин, А. Т.; Харлампиди, Х. Э.; Kurbankulov, S.R.; Nigmatullin, T.F.; Dao, My Uyen; Khamidullin, R. F.; Akhmadullina, A.G.; Vasseghian, Yasser; Hoang, H. Y.

doi:10.1016/j.envres.2021.112171

Cited by 3 publications

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“…In this reaction, metal phthalocyanines behave as biomimetic catalysts (inorganic mimics of cytochrome P450), because they are capable of limited oxidation of mercaptans into disulfides by molecular oxygen under mild conditions. The catalytic oxidative demercaptanization is widely used for eliminating offensive odors from industrial wastewaters and petroleum products [14,16] and to reduce the corrosion activity of mercaptans in motor fuel [15]. The Merox process was used in the present work as a model reaction to compare the catalytic performance of transition metal complexes of petroleum porphyrins, synthesized for the first time from high-purity petroleum vanadyl porphyrins obtained by the sulfocationite-based chromatographic method [11].…”

Section: Introductionmentioning

confidence: 99%

Complexes of Transition Metals with Petroleum Porphyrin Ligands: Preparation and Evaluation of Catalytic Ability

et al. 2021

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In the present work, the first data on the catalytic activity of d-metal complexes of petroleum porphyrins obtained via two-stage re-metallization (acid demetallization with subsequent metalation) of high-purity petroleum vanadyl porphyrins are presented. During acid demetallization of petroleum vanadyl porphyrins, the highest yield (49%) and spectral purity of free petroporphyrin bases were achieved with concentrated sulfuric acid and a diluted solution of vanadyl porphyrins in chloroform. In the series of divalent cations of Mn, Fe, Co, Ni, Cu, and Zn, only the last four metals are complexed with demetallated petroporphyrins without significant changes in their component composition, whereas the interaction with Mn and Fe cations causes an evident structural transformation or even full degradation of petroporphyrin macrocycles, respectively. The composition and spectral purity of petroleum porphyrin-containing reactants and products were analyzed by FT-IR, UV-Vis, NMR, and MALDI-TOF mass spectroscopic methods. The obtained petroporphyrin-based d-metal complexes were assayed by the reaction of 2-mercaptoethanol oxidative dimerization, in which the copper porphyrins exhibited the highest catalytic activity.

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