Materiais mesoporosos nanoestruturados com diferentes morfologias: suporte para catalisadores de conversão de CO2

Abstract

Carbon Dioxide has been the subject of many global discussions due to its significant impact on the planet's greenhouse effect. Among many sources of emissions are the oil and energy industries. There are many alternatives to mitigate this problem, such as its hydrogenation for methanol production. This process has attracted considerable research interest, particularly in the use of silica supports for anchoring catalysts based on copper, zinc, and zirconium. Among these supports are the mesoporous nanostructured materials like SBA-15 and KIT-6, which, due to their textural properties and other characteristics, have garnered much attention in this process. These properties can be enhanced by changing the morphology, which is achieved through the synthetic process. Thus, the objective of this work is to synthesize mesoporous nanostructured materials of the SBA15 type in different morphologies and KIT-6, in order to obtain different textural properties, to be evaluated in the hydrogenation reaction of carbon dioxide (CO2) to obtain methanol, using hydrothermal synthesis at different reaction temperatures. The materials were characterized by X-ray Diffraction, N2 adsorption and desorption, Scanning Electron Microscopy (SEM), and Fourier Transform Infrared Spectroscopy (FTIR). CO2 adsorption experiments were conducted to evaluate the adsorption capacity of each material. The reactions were performed for conversion to obtain methanol, and each product was identified using gas chromatography. The material with rice grain morphology showed the best results for CO2 adsorption, about 4.71 mmol/g, conversion, and selectivity with 57.31% and 15.93%, respectively.