Methanol Synthesis from CO2 Using Skeletal Copper Catalysts Containing Co-precipitated Cr2O3 and ZnO

摘要: Skeletal Cu-Cr2O3-ZnO catalysts have been prepared by leaching CuAl2 alloy particles at 273 K using 6.1 M aqueous NaOH solutions containing sodium chromate (Na2CrO4) and zincate (Na2Zn(OH)4). The presence of in the caustic solution was found to affect pore structure surface areas resulting catalysts. Both BET Cu were increased increasing concentration Na2CrO4 Na2Zn(OH)4. Increasing level from 0 0.06 a 6.1M 0.2M Na2Zn(OH)4 caused content ZnO catalyst decrease 8.8 3.0 wt% whilst Cr2 O3 1.7 wt%, indicating that leach liquor not only resulted deposition Cr compound but also inhibited precipitation zinc hydroxide onto skeletal On other hand, 0.6 0.008 Na2 CrO4 loading 8.9wt% with an almost constant (1.3 ± 0.2%) catalysts, revealing led did suppress Cr2O3 formation. Hydrogenation CO2 studied gas mixture 24% H2 total pressure 4MPa, space velocities up 210000L kg-1h-1 temperatures range 493-533K. be both highly active selective for methanol synthesis. This study confirms role promoting activity copper synthesis improving selectivity inhibiting reverse water-gas shift reaction. is improve structural development high area copper.