Study On Aluminum Alloy Reduction Of Carbon Dioxide And In-situ Preparation Of Copper-based Catalyst

CO₂ hydrogenation reduction is an important way to reuse CO₂ and cope with the greenhouse gas effect.Cu-based catalysts（CuZnAl,CuMgAl）are commonly used catalysts for thermal catalytic reduction of CO₂ in industrial production.The traditional preparation method-co-precipitation requires mixing,precipitation,crystallization.filtration.washing,drying,hydrogen pre-reduction and other processes,the process flow is very complicated.In addition.the transportation and storage of hydrogen poses greater safety hazards.This paper proposes a new method for preparing Cu-based catalysts by in-situ hydrogenation and reduction of CO₂ from Al alloys catalyzed by copper with different valences.The performance of Al-based alloys on CO₂ in-situ hydrogenation reduction and its influencing factors（alloy type,alloy composition,copper source type,copper loading,carbon source type,carbon source concentration,reaction time,reaction temperature,etc.）were studied.Gas chromatography,nuclear magnetic resonance spectrometer（NMR）were used to determine the composition of gas and liquid products,X-ray diffraction（XRD）,X-ray photoelectron spectroscopy（XPS）,scanning electron microscope（SEM）and other methods were used to analyze the synthesis of catalysts.Differences in morphology,structure and composition.The main results are as follows:1.The gas phase products of the AlZn alloy catalytic reduction of CO₂ include CO and CH₄,while the AlMg alloy and AlCu alloy are mainly CH₄.HCOOH is the main liquid phase product shared by the three alloys;2.The catalytic performance is higher The lowest order is AlCu alloy>AIMg alloy>AlZn alloy.Among them,AlCu50 alloy obtains the highest conversion rate of 37.2%under the conditions of 24h and 210℃,which is about 4.1 times that of AlZn alloy;3.Catalyst material obtained after AlZn alloy reaction The main components are Cu and ZnAl₂O₄,while the AlMg alloy and AlCu alloy are Cu and magnesium-aluminum hydrotalcite after the reaction.This study provides a new idea for the catalytic reduction of CO₂ hydrogenation and a new method for the preparation of Cu-based catalysts.