Hydrogen Production by Ethanol Steam Reforming Catalyzed with Ni Supported by Rare Earth Modified CaO Carrier AITranslate

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Chinese Library Classification Number:TQ426.64[化学工程]

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Ni/CaO-La₂O₂CO₃(NCaL)catalyst was prepared by supporting Ni with CaO carrier modified by rare earth compound La₂O₂CO₃.Its catalytic effect for hydrogen production by ethanol steam reforming was studied,compared with the unmodified Ni/CaO(NCa)catalyst.The phase of the catalyst was analyzed by X-ray diffractometer(XRD),the redox capacity was tested by temperature programmed chemisorption instrument(TPR),and the hydrogen production performance was analyzed by chromatography worksta-tion.The results show that the ethanol conversion rate at 300℃of NCa is less than 70%,while that of NCaL is more than 80%.The ethanol conversion rate at 400℃of NCaL reaches 100%,while that of NCa is less than 95%.The La₂O₂CO₃ modification can significantly improve the ethanol conversion rate and ca-talytic activity at low temperature of the catalyst.At 600℃,the H₂ selectivity of NCaL reaches the maxi-mum value of nearly 90%,which is 14.31%higher than the maximum H₂ selectivity of NCa.The selectivi-ty of H₂ and CO₂ of NCaL is higher than that of NCa,while its selectivity of CO and CH4 is decreased.The La₂O₂CO₃ modification can significantly improve the H₂ selectivity of the catalyst,and CaO carrier modified by rare earth can improve the hydrogen production effect of ethanol steam reforming catalyzed by Ni.