Homogeneous Redox Catalysts Based on Heteropoly Acid Solutions: IV. Tests of Methyl Ethyl Ketone Synthesis Catalysts in the Presence of Equipment Corrosion Products (Metal Cations)
E. G. Zhizhinaа1 and L. L. Goginа, *
а Boreskov Institute of Catalysis, Siberian Branch, Russian Academy of Sciences, Novosibirsk, 630090 Russia
Correspondence to: *e-mail: gogin@catalysis.ru
1Abbreviations and notation: HPA, heteropoly acid; MEK, methyl ethyl ketone; Pc, cobalt dichlorodisulfophthalocyanine disodium salt; E, redox potential; GLC, gas–liquid chromatography; NHE, normal hydrogen electrode; m, degree of reduction of the HPA-x solution; Δm, change in the degree of reduction of the HPA-x solution during reaction; τbut, butylene reaction time; τoxyg, catalyst regeneration time; Wbut, butylene absorption rate.
Received 12 March, 2021
Abstract—The effect of equipment corrosion products (transition metal cations) on the physicochemical and catalytic properties of a homogeneous Pd(II)+HPA-x (Mo–V–P heteropoly acid containing x vanadium atoms) catalyst developed for the two-stage oxidation of n-butene to methyl ethyl ketone (MEK) with oxygen has been studied. The thermal stability of a solution of a catalyst based on HPA-x in the presence of transition metal cations has been determined. The composition of the two-component catalyst recommended for pilot testing of the MEK process has been optimized.
Keywords: heteropoly acids, homogeneous catalysis, butylene oxidation, methyl ethyl ketone
DOI: 10.1134/S002315842105013X