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Study on catalysts based on metal-metal oxide nanocomposites doped and encapsulated by mesoporous coating for methanol production by CO2 hydrogenation

Grant number: 17/10154-6
Support type:Scholarships in Brazil - Doctorate
Effective date (Start): August 01, 2017
Effective date (End): August 31, 2020
Field of knowledge:Engineering - Chemical Engineering - Chemical Process Industries
Cooperation agreement: Coordination of Improvement of Higher Education Personnel (CAPES)
Principal Investigator:Elisabete Moreira Assaf
Grantee:Marco Aurélio de Lima Silva Rossi
Home Institution: Instituto de Química de São Carlos (IQSC). Universidade de São Paulo (USP). São Carlos , SP, Brazil
Associated research grant:15/06246-7 - Biorefinery concept applied to biological wastewater treatment plants: environmental pollution control coupled with material and energy recovery, AP.TEM

Abstract

Wastewater and sewage treatment systems are increasingly important in terms of sustainable management of current water resources. Despite the great efficiency of these systems, some aspects still need to be improved such as the search for appropriate destination for the biogas components generated in the process. The biogas consists mainly of CO2 and CH4, greenhouse gases whose atmospheric emission is very harmful to the environment. Focusing on CO2, the thermal reduction by catalytic hydrogenation of this compound is shown as one of the most promising actions based on the current sustainability pillars. Considering the products that can be obtained by this reaction, methanol proves valuable for its varied possibilities of application that generate a high annual production demand. Of all the catalysts classes that can be employed, the composites between metals and metal oxides have characteristics that make them very suitable for the process. In recent years, several efficient catalysts have been developed. Despite that fact, current catalysts can still be improved using manipulation strategies of the chemical and structural nature of the materials aiming, among other aspects, for greater interfacial contact between the components, greater metallic dispersion, easier formation of oxygen vacancies in the oxides, greater resistance to the aggregation of the particles and less deactivation by poisoning due to the water produced during the reaction. Therefore, the present project proposes the synthesis of catalysts based on copper-zirconia and copper-ceria nanocomposites doped with In and La and encapsulated by mesoporous silica and their application as catalysts in the CO2 hydrogenation to methanol. (AU)