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Ga-Ni nanoparticles supported on porous silica for methanol synthesis from CO2 at low pressures

Grant number: 17/22671-5
Support type:Scholarships in Brazil - Doctorate
Effective date (Start): May 01, 2018
Status:Discontinued
Field of knowledge:Physical Sciences and Mathematics - Chemistry - Physical-Chemistry
Principal Investigator:Elisabete Moreira Assaf
Grantee:Letícia Fernanda Rasteiro
Home Institution: Instituto de Química de São Carlos (IQSC). Universidade de São Paulo (USP). São Carlos , SP, Brazil
Associated scholarship(s):19/22260-0 - Sub-monolayer control of the growth of ZrO2 films over ordered mesoporous silica supports and interface tailoring of Ni-Ga catalysts by Atomic Layer Deposition (ALD), BE.EP.DR

Abstract

Currently, methanol, one of the main products of interest in the chemical industry, is produced from the synthesis gas (CO/H2) in a high pressure process (50-100 bar) using Cu/ZnO/Al2O3 as catalyst. The increase in world demand for methanol predicted for the next years makes necessary the development of alternative, selective and low cost processes for its synthesis. An alternative route that has gained a lot of attention in recent years is the well-known CCUS (Carbon Capture Utilization and Storage), which, in addition to capturing and storing CO2 from a variety of stationary and mobile sources, transforms it into higher added value products such as or methanol. This route participates in the current technologies of CO2 abatement. Among the catalysts used for CO2 hydrogenation for methanol formation, the great majority are based on Cu and little study was done with catalysts based on other metals. In this project, supported and unsupported Ni-Ga catalysts will be evaluated in CO2 hydrogenation under low pressure conditions. It is intended to carry out the study of the alloy composition seeking the best catalytic properties, through the synthesis using a surfactant-assisted method, which can act to control the size and homogeneity of the formed particles. The porosity control of the support will also be evaluated in order to find dimensions in the order of mesopores, since these allow a good dispersion of the metallic phase. It is also intended to modify the support basicity and evaluate this effect on the catalytic activity and selectivity, since CO2 adsorption occurs at catalyst basic sites and these are essential for a high selectivity to methanol. In situ and operando characterization techniques (XPD, XAS, DRIFTS) will be used in order to obtain a catalyst activity/property correlation and information about the reaction mechanism. (AU)