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JOURNALS // Mendeleev Communications // Archive

Mendeleev Commun., 2025 Volume 35, Issue 4, Pages 484–486 (Mi mendc7266)

Communications

Ordered and disordered zirconia-modified silica supports in diclofenac hydrodechlorination over palladium catalyst

E. S. Loktevaa, E. G. Khachatryana, M. D. Pesotskiya, E. V. Golubinaa, K. I. Maslakova, I. Yu. Kaplina, S. I. Kirikovb, S. V. Maksimova

a Department of Chemistry, M. V. Lomonosov Moscow State University, 119991 Moscow, Russian Federation
b Institute of Chemistry and Chemical Technology, Siberian Branch of the Russian Academy of Sciences, 660036 Krasnoyarsk, Russian Federation

Abstract: The performance of Pd catalysts supported on ordered (ZrSBA) or disordered (ZS) ZrO2-modified SiO2 was evaluated in the hydrodechlorination of ecotoxic diclofenac with H2 in an aqueous medium at 30 °C, after pre-reduction of the catalysts with H2 at 320 °C or in water at 30 °C. The ordered 0.1 wt% Pd/ZrSBA catalysts with lower Pd content, reduced at both temperatures, showed similar diclofenac conversion rates that were comparable to or much higher than those of the 0.86 wt% Pd/ZS catalysts reduced at 320 or 30 °C, respectively. A comprehensive analysis using XRD, N2 adsorption, TEM-EDA, TPR and XPS techniques revealed the presence of larger Pd nanoparticles, a reduced degree of Pd decoration with silica and slightly improved reducibility of Pd/ZrSBA at 30 °C compared to Pd/ZS, which resulted in a superior efficiency of the former catalyst.

Keywords: diclofenac, hydrodechlorination, catalyst, mesopores, ordered structure, catalyst reduction.

Received: 27.12.2024
Accepted: 13.02.2025

Language: English

DOI: 10.71267/mencom.7717



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© Steklov Math. Inst. of RAS, 2025