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Effect of CeO_(2) on carbon deposition resistance of Ni/CeO_(2) catalyst supported on SiC porous ceramic for ethanol steam reforming

查看全文 作　　者：Tingting [1]Bao;Hui [1]zhou;Yi [1]Zhang;Chenxu [1]Guo;Wenming [1]Guo;Hang [1]Qin;Pengzhao [1]Gao;Hanning [1]Xiao;Weixiong [2]Liu 高影响力作者 机构地区：[1]College of Materials Science and Engineering,Hunan University,Changsha,410082,China;[2]School of Chemical Engineering,Sichuan University,Chengdu,610065,China高影响力机构 出　　处：《Journal of Rare Earths》索引2023年第41卷第11期,共12页高影响力期刊 基　　金：Project supported by the Natural Science Foundation of Hunan Province,China (2022JJ30133)。 摘　　要：Ni/CeO_(2) catalysts(nCeO_(2):n_(Ni)=0,1,4,7,10)supported on SiC porous ce ramics for ethanol steam reforming(ESR)were investigated with respect to hydrogen production performance and growth of carbon deposition.The oxygen released from CeO_(2) enables the oxidation of CH_(x) species to serve as carbon precursors,thus providing Ni/CeO_(2) catalysts with stronger resistance to carbon deposition compared with Ni catalysts.The Ni/CeO_(2) catalysts prepared by inverse microemulsion and impregnation methods exhibit regular semicircular spherical shape on SiC porous ceramics.Under 500℃for 25 h of ESR reaction,the ethanol conversion rate over Ni/CeO_(2) catalysts(n_(CeO_(2)):n_(Ni)=7)is sustained up to 100%and H_(2) selectivity is essentially kept at 74%.The by-product selectivity declines stepwise with increasing content of CeO_(2),which is attributed to the adsorption and oxidation of CO and of CH_(x) species as CH_4 precursor from CeO_(2).The scanning electron microscopy(SEM)and transform electron microscopy(TEM)results reveal that further loading of CeO_(2) on the surface of Ni catalysts can alleviate both migration and sintering of Ni particles.Furthermore,carbon deposition on Ni/CeO_(2) catalysts preferentially outgrow filamentous rather than amorphous carbon,with a tendency for the latter to be more deactivated. 关 键 词：SiC porous CERAMIC Ni/CeO_(2)catalyst Carbon deposition Ethanol steam reforming Rare earths
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