Glycerol Oxidation over Supported Gold Catalysts: The Combined Effect of Au Particle Size and Basicity of Support

Processes

Nina Bogdanchikova¹  Alberto Villa²  Laura Prati²  Marta Stucchi²  Vicente Cortés Corberán³  Sónia.A.C. Carabineiro⁴  Ekaterina Pakrieva⁵  Dmitrii German⁵  Alexey Pestryakov⁵  Ekaterina Kolobova⁵ 

[1] Centro de Nanociencias y Nanotecnología, Universidad Nacional Autónoma de México, P.O. Box 14, 22800 Ensenada, Mexico;Dipartimento di Chimica, Università degli Studi di Milano, via Golgi 19, 20133 Milano, Italy;Instituto de Catálisis y Petroleoquímica, Consejo Superior de Investigaciones Científicas, Marie Curie 2, 28049 Madrid, Spain;LAQV-REQUIMTE, Department of Chemistry, NOVA School of Science and Technology, Universidade NOVA de Lisboa, 2829-516 Caparica, Portugal;Research School of Chemistry & Applied Biomedical Sciences, National Research Tomsk Polytechnic University, Lenin Av. 30, 634050 Tomsk, Russia;

关键词: gold catalysts;    glycerol oxidation;    catalyst selectivity;    glyceric acid;    glycolic acid;    tartronic acid;   

DOI  :  10.3390/pr8091016

来源: DOAJ

【 摘 要 】

Gold nanoparticles supported on various oxides (CeO₂, CeO₂/TiO₂, MgO, MgO/TiO₂, La₂O₃, La₂O₃/TiO₂) (with 4 wt.% Au loading) were investigated in the liquid (aqueous) phase oxidation of glycerol by molecular oxygen under mild conditions, in the presence of alkaline earth (CaO, SrO and MgO) or alkaline (NaOH) bases. Full conversion and selectivity between 38 and 68% to sodium glycerate were observed on different Au supported catalysts (Au/MgO/TiO₂, Au/La₂O₃/TiO₂, Au/CeO₂ and Au/CeO₂/TiO₂). The combined effect of Au particle size and basicity of the support was suggested as the determining factor of the activity. Agglomeration of gold nanoparticles, found after the reaction, led to the deactivation of the catalysts, which prevents the further oxidation of sodium glycerate into sodium tartronate. Promising results were obtained with the use of alkaline earth bases (CaO, SrO, MgO), leading to the formation of free carboxylic acids instead of salts, which are formed in the presence of the more usual base, NaOH.

【 授权许可】

Unknown