Study On Preparation Of InZrO_x By Microfluidic Continuous Co-precipitation Method For Methanol Production From CO₂ And H₂

The process of industrialization and human activities in various countries in the world have exacerbated CO₂ emissions.The ecological and environmental problems caused by the greenhouse effect have become increasingly prominent,and CO₂capture,conversion and utilization are imminent.Focusing on the process of CO₂hydrogenation to synthesize methanol,aiming at the technical bottleneck of the low reaction efficiency of the existing catalytic system,in view of the special oxygen vacancy high-temperature activation of CO₂ mechanism of the bimetal oxide catalyst,combined with the excellent CO₂ adsorption hydrogenation conversion ability of ZrO₂and In2O3,the paper proposes The microfluidic continuous co-precipitation method was used to carry out the research work on the preparation,characterization and performance evaluation of the InZrO_x solid solution structure catalyst.Microfluidic continuous co-precipitation method was used to investigate the composition of different InZrO_x bimetallic oxide In₂O₃ solid solution components and preparation methods,the type of precipitant,calcination temperature,two-phase flow rate,aging time and aging temperature.And CO₂ hydrogenation to methanol catalytic performance;the traditional co-precipitation method,impregnation loading method and physical blending method to prepare bimetal oxide as a reference for comparison,with the help of XRD,XPS,HRTEM,DRUV-vis,N2 adsorption-desorption,O₂-TPD,H₂-TPR,CO₂-TPD and other analysis and characterization methods,systematically investigated the influence of In2O3 doping amount,precipitant type and calcination temperature on the physical and chemical properties and catalytic performance of InZrO_x bimetallic oxide solid solution catalyst And the structure-activity relationship of 50%InZrO_x catalyst was studied;the process conditions of microfluidic continuous co-precipitation preparation and the reaction conditions of CO₂ hydrogenation to methanol were optimized.The results show that using the microfluidic continuous co-precipitation method,the In₂O₃ solid solution content is 50%,the two-phase flow rate is 20ml/min,80℃aging 2h,ammonium carbonate as the precipitant and 500℃baking 3h,50%InZrO_x bimetallic oxide is prepared The solid solution catalyst has excellent catalytic performance of CO₂ hydrogenation to methanol.Under the reaction conditions of reaction pressure 3MPa,temperature 320℃,GHSV=14400mlg-1h-1,CO₂ conversion rate,methanol selectivity and methanol space-time yield STY reach respectively 12.53%,89.43%and 0.55g_MeOH·h^-1·g^-1_cat.