Abstract: Highly dispersed LaCo1-x-yCuxTiyO3/KIT-6 perovskites were synthesized by citrate method with inert mesoporous KIT-6 addition. KIT-6 matrix was removed by dissolution in 7% NaOH aqueous solution. The dispersity of perovskites is probably varying depending on the largest cation and its content in the B position of perovskite ABO3 structure. The Co(S=2)3+/Co(S=0)3+ ratio increases with the growth copper content and with the presence of Ti4+. It may be explained by the compensation of the distortion of perovskite structure. The maximum syn-gas conversion is achieved at nCo/nCu = 7/3. At a higher copper content the activity of the samples decreases due to the formation of large copper particles (up to 40 nm) in the course of the reduction. The selectivity for alcohols increases with an increase in the proportion of copper and reaches maximum values at a ratio of nCo/nCu close to 1. The distribution of alcohols is the same for all samples, except for LaCo0.35Cu0.35Ti0.3O3/KIT-6. It can be assumed that the synthesis of alcohols proceeds on bimetallic CoCu particles 3 nm in size and cobalt particles 4–6 nm in size, most likely enriched with copper on the surface.

Cite: Dokuchits E.V. , Kardash T.Y. , Larina T.V. , Bespalko Y.N. , Minyukova T.P.
LaCo1-x-yCuxTiyO3/KIT-6 Perovskites: Synthesis and Catalytic Behavior in Syngas Conversion to Higher Alcohols
Dalton Transactions. 2023. V.52. N2. P.409-420. DOI: 10.1039/D2DT03298H WOS Scopus РИНЦ AN PMID OpenAlex

Dates:

Submitted:	Oct 12, 2022
Accepted:	Dec 1, 2022
Published online:	Dec 5, 2022
Published print:	Jan 14, 2023

Identifiers:

Web of science:	WOS:000899311700001
Scopus:	2-s2.0-85144291267
Elibrary:	54356113
Chemical Abstracts:	2022:3107655
PMID:	36520036
OpenAlex:	W4311574968

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