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Development of graphene supported catalysts for the selective CO2 hydrogenation toward dimethyl ether (DME)

Grant number: 18/18798-2
Support type:Regular Research Grants
Duration: March 01, 2019 - February 28, 2021
Field of knowledge:Engineering - Chemical Engineering
Principal Investigator:Adriana Maria da Silva
Grantee:Adriana Maria da Silva
Home Institution: Instituto Nacional de Pesquisas Espaciais (INPE). Ministério da Ciência, Tecnologia, Inovações e Comunicações (Brasil). São José dos Campos , SP, Brazil
Assoc. researchers:Livia Melo Carneiro ; Márcio Steinmetz Soares ; Maurício Ribeiro Baldan

Abstract

This research aims at the development of bi functional catalysts supported on graphene toward the selective dimethyl ether (DME) production from the CO2 hydrogenation, in one step. Therefore, the objective of this study is the development of catalysts with the structure M/graphene-D, where M is a transition metal (Cu, Co, Ni and Pd) and D is a dopant (Nb, Zr, Al and Si). The M site is related to the hydrogenation while the support dopant is the site correlated to the methanol dehydration, which is an intermediate in DME formation. The goal of the dopant introduction is to increase the acid sites in order to promote the methanol dehydrogenation to DME. The catalytic behavior will be correlated with the active sites to the DME selective production. The physicochemical and structural properties of the catalyst will be determined through a detailed characterization as follow: X-Ray Fluorescence (XRF); X-Ray Diffraction (XRD); N2 physisorption; Programmed Temperature of Desorption (CO2 TPD and NH3 TPD); High Resolution Electron Transmission Microscopy (HRTEM) and X-Photoelectron Spectroscopy (XPS). The thermal stability of the catalysts will be investigated by Thermogravimetric Analysis coupled to a Mass Spectrometer. The reaction mechanism will be evaluated through in situ characterization: Programmed-Temperature Surface Reaction (TPSR) and Diffuse Reflectance Fourier Transform (DRIFTS).The catalytic performance on the CO2 hydrogenation will be carried out in a fixed be reactor under temperature, pressure, spatial velocity and H2/CO2, previously optimized. (AU)