Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Ni-Cu and Ni-Co-Modified Fly Ash Zeolite Catalysts for Selective Hydrodeoxygenation of Levulinic Acid to γ-Valerolactone

Margarita Popova
* ,
Momtchil Dimitrov
,
Silviya Boycheva
ORCID logo ,
Ivan Dimitrov
,
Filip Ublekov
,
Neli Koseva
ORCID logo ,
Genoveva Atanasova
ORCID logo ,
Ágnes Szegedi
* ORCID logo
Version 1 : Received: 22 November 2023 / Approved: 1 December 2023 / Online: 1 December 2023 (04:52:49 CET)

A peer-reviewed article of this Preprint also exists.

Popova, M.; Dimitrov, M.; Boycheva, S.; Dimitrov, I.; Ublekov, F.; Koseva, N.; Atanasova, G.; Karashanova, D.; Szegedi, Á. Ni-Cu and Ni-Co-Modified Fly Ash Zeolite Catalysts for Hydrodeoxygenation of Levulinic Acid to γ-Valerolactone. Molecules 2024, 29, 99. Popova, M.; Dimitrov, M.; Boycheva, S.; Dimitrov, I.; Ublekov, F.; Koseva, N.; Atanasova, G.; Karashanova, D.; Szegedi, Á. Ni-Cu and Ni-Co-Modified Fly Ash Zeolite Catalysts for Hydrodeoxygenation of Levulinic Acid to γ-Valerolactone. Molecules 2024, 29, 99.

Abstract

Monometallic (Ni, Co, Cu) and bimetallic (Ni-Co, Ni-Cu) 10-20 wt. % metal containing catalysts supported on fly ash zeolite were prepared by post-synthesis impregnation method. The catalysts were characterized by X-ray powder diffraction, N2 physisorption, XPS and H2-TPR methods. Finely dispersed metal oxides and mixed oxides were detected after the decomposition of impregnating salt on the relevant zeolite support. By reduction intermetallic, NiCo and NiCu phases were identified in the bimetallic catalysts. Hydrogeoxygenation of lignocellulosic biomass-derived levulinic acid to γ-valerolactone (GVL) was studied. Bimetallic, 10 wt. % Ni, 10 wt. % Cu or Co containing fly ash zeolite catalyst showed higher catalytic activity than monometallic ones. Their selectivity to GVL reached 70-85 % at 100 % conversion. The reaction proceeds through formation of 4-hydroxy pentanoic acid, as the only intermediate compound.

Keywords

lignocellulosic biomass; levulinic acid; fly ash zeolite; γ-valerolactone; Co-Ni alloy

Subject

Chemistry and Materials Science, Materials Science and Technology

Copyright: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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