Author, as appears in the article.: Fakhrnasova, Dina; Chimentao, Ricardo J.; Medina, Francisco; Urakawa, Atsushi;
Department: Enginyeria Química
URV's Author/s: CHIMENTON, RICARDO JOSE / Medina Cabello, Francisco
Keywords: Urea Transesterification Reaction mechanism Multivariate curve resolution Mixed-metal oxides Kinetics Ethylene glycol Ethylene carbonate Doe Acid-base property
Abstract: This work employs (i) a rational approach to improve the material properties of catalysts for urea transesterification with ethylene glycol (EG) to ethylene carbonate (EC) over metal oxides and (ii) a statistical approach to maximize the desired product. For the rational approach, single- and mixed-metal oxides with different elemental combinations (Zn, Mg, Al, Fe) with a variety of acid−base properties were synthesized and evaluated for the reaction. The roles of acidity and basicity in the identified reaction paths were clarified on the basis of product selectivities and kinetic parameters extracted from the concentration profiles of reactants and products in every reaction path by means of in situ IR monitoring and subsequent multivariate analysis. The paths toward EC are favorably catalyzed by acidic sites, while basic sites catalyze all paths toward undesired products. However, the surface sites are blocked when the acidity is too high and there exists an optimum value for the ratio of total acidic and basic sites to be an efficient catalyst in the targeted reaction. A mixed-metal oxide consisting of Zn and Fe at a 3:1 atomic ratio was found to be the optimum catalyst with a well-balanced acid−base property. Furthermore, a design of experiments (DoE) approach was used to statistically identify critical reaction parameters and optimize them for the best Zn- and Fe-containing catalysts. These approaches successfully gave insights into the determining material factors for the reaction and afforded excellent EC selectivity (up to 99.6%) with high yield.
Thematic Areas: Química Materiais Interdisciplinar General chemistry Engenharias ii Ciências agrárias i Chemistry, physical Chemistry (miscellaneous) Chemistry (all) Catalysis Astronomia / física
licence for use: https://creativecommons.org/licenses/by/3.0/es/
Author's mail: francesc.medina@urv.cat
Author identifier: 0000-0002-3111-1542
Record's date: 2024-09-07
Papper version: info:eu-repo/semantics/publishedVersion
Link to the original source: https://pubs.acs.org/doi/10.1021/acscatal.5b01575
Licence document URL: https://repositori.urv.cat/ca/proteccio-de-dades/
Papper original source: Acs Catalysis. 5 (11): 6284-6295
APA: Fakhrnasova, Dina; Chimentao, Ricardo J.; Medina, Francisco; Urakawa, Atsushi; (2015). Rational and statistical approaches in enhancing yield of ethylene carbonate in urea transesterification with ethylene glycol over metal oxides. Acs Catalysis, 5(11), 6284-6295. DOI: 10.1021/acscatal.5b01575
Article's DOI: 10.1021/acscatal.5b01575
Entity: Universitat Rovira i Virgili
Journal publication year: 2015
Publication Type: Journal Publications