Decarbonisation , PtX , Green Hydrogen , CCS/CCUS / CDR , Blue Hydrogen , Energy Transition , Hydrogen Economy
#GreenHydrogen + #CO2 to #methanol, breakthrough conversion-selectivity "#MethanolEconomy." methanol is a bulk basic chemical that can be used to prepare important chemical products such as olefins, aromatics, formaldehyde, dimethyl ether, etc. It is an important raw material for plastic products, cosmetics, and architectural coatings. With the accelerated development of carbon dioxide hydrogenation to methanol technology, new high-efficiency catalysts are emerging one after another, and catalyst characterization and evaluation processes are continuously optimized. hydrogenation of CO2 to produce methanol, and its reaction equation is as follows: CO 2 +3H 2 =CH 3 OH+H 2 O (1) The main side reaction is the reverse water gas reaction (RWGS), (2) CO 2 +H 2 =CO+H 2 O (2) CO2 hydrogenation to methanol is an exothermic reaction (Eq. 1), while the RWGS side reaction is an endothermic (Eq. 2) In order to achieve an appreciable reaction rate, increasing the reaction temperature, but this is also accompanied by a sharp sacrifice in methanol selectivity, because the competing RWGS reaction is thermodynamically favored at high temperatures. , methanol product may also decompose to form CO at high temperatures , with the increase of reaction temperature CO2 conversion and methanol selectivity generally show a seesaw relationship over various catalysts I the development of catalysts Commonly used catalysts include copper-based catalysts, metal oxide catalysts, precious metal catalysts, and other new catalysts (such as metal sulfides) . At present, the research on catalysts for the hydrogenation of CO2 to methanol mainly focuses on copper-based catalysts. designed and synthesized copper-based catalysts by introducing carriers, additives, and improving or introducing new preparation methods, regulating the interactions between the catalyst components, promoting the dispersion of copper, and obtaining more active sites, thereby improving the carbon dioxide conversion rate and methanol selectivity. In addition, explore the generation, migration and conversion paths of intermediate species in the process of carbon dioxide hydrogenation to methanol, clarifying the reaction path and reaction mechanism, and promoting the process of methanol industrialization. 1-commercial Cu/ZnO/Al2O3 catalyst has a methanol selectivity of 75% and a CO2 conversion of 5% at 200°C, but the selectivity drops rapidly to below 50% when the CO2 conversion approaches 20% at 250°C. 2-deposition-precipitation method to prepare Cu-ZnO-SrTiO 3 catalysts with structured n-type semiconductor material SrTiO 3 as the support for the hydrogenation of carbon dioxide to methanol. 3-Indium oxide is a breakthrough catalyst for the hydrogenation of carbon dioxide to methanol. nickel-indium oxide catalysts by comparing co-precipitation and impregnation methods #CCUS
