Selective glucose oxidation to glucaric acid using bimetallic catalysts: Lattice expansion or electronic structure effect?

0578834 - ÚFCH JH 2025 RIV NL eng J - Journal Article
Lavrič, Ž. - Teržan, J. - Kroflič, A. - Zavašnik, J. - Olszówka, Joanna Elżbieta - Vajda, Štefan - Huš, M. - Grilc, M. - Likozar, B.
Selective glucose oxidation to glucaric acid using bimetallic catalysts: Lattice expansion or electronic structure effect?
Applied Catalysis B - Environmental. Roč. 343, APR 2024 (2024), č. článku 123455. ISSN 0926-3373. E-ISSN 1873-3883
R&D Projects: GA ČR(CZ) GF21-48595L
Institutional support: RVO:61388955
Keywords : glucaric acid * glucose oxidation * catalyst characterization * DFT
OECD category: Physical chemistry
Impact factor: 22.1, year: 2022
Method of publishing: Open access

Our study presents a comprehensive approach for the selective oxidation of glucose to glucaric acid (GA) by heterogeneous catalysis. We have synthesized and characterized Au/ZrO2, AuCu/ZrO2 and AuPt/ZrO2 catalysts using X-ray diffraction (XRD), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and oxygen pulse chemisorption (OPS) techniques. Combining experimental observations with in-depth density functional theory (DFT) studies, we found that bimetallic catalysts form alloys, which exhibit different characteristics than monometallic counterparts for the given reaction. We performed batch reactions, varying temperature and oxygen pressure, and used the data to construct a predictive microkinetic model. As it turned out, AuPt/ZrO2 showed the highest selectivity, yielding 32% of GA at 100 °C and 30 barg O2. Our results provide valuable insights for the developing of efficient catalysts and point out the bottlenecks for the oxidation of glucose to GA.
Permanent Link: https://hdl.handle.net/11104/0347751