A series of TiO2-SiO2 supported cobalt catalysts were prepared by using the incipient wetness impregnation method,and their activity and selectivity were evaluated for the selective hydrogenation of cinnamaldehyde to ...A series of TiO2-SiO2 supported cobalt catalysts were prepared by using the incipient wetness impregnation method,and their activity and selectivity were evaluated for the selective hydrogenation of cinnamaldehyde to cinnamyl alcohol.The effects of Co loading,calcination temperature,reduction temperature and rare earth promoters on the hydrogenation performance of the catalysts were tested.The results showed that the catalytic performance of cobalt catalyst depended on the crystal size of Co on the catalyst surface.The catalyst with bigger Co crystals exhibited higher hydrogenation activity and selectivity of cinnamyl alcohol.The optimal cobalt loading,calcination temperature and reduction temperature of the catalyst for cinnamaldehyde hydrogenation were found to be 15%,823 K and 823 K,respectively.The addition of rare earth La or Ce enhanced the dispersion of Co on the catalyst surface,and increased the catalytic activity.展开更多
肉桂醇脱氢酶(CAD)在木质素合成过程中起关键作用。通过RACE(rapid-amplification of cDNA ends)方法从香蕉根系cDNA均一化全长文库中获得一个肉桂醇脱氢酶基因,命名为MaCAD1(GenBank登录号为KF582533)。MaCAD1是香蕉MYB基因编码框全长c...肉桂醇脱氢酶(CAD)在木质素合成过程中起关键作用。通过RACE(rapid-amplification of cDNA ends)方法从香蕉根系cDNA均一化全长文库中获得一个肉桂醇脱氢酶基因,命名为MaCAD1(GenBank登录号为KF582533)。MaCAD1是香蕉MYB基因编码框全长cDNA,包含一个1 077bp的最大开放阅读框(ORF),编码358个氨基酸。蛋白质序列同源比对发现,其含有完整的醇脱氧酶的典型保守结构域,属于典型的CAD蛋白。系统进化树比对分析表明,MaCAD1与水稻OsCAD6(CAD39907)的亲缘关系较近。组织特异性研究表明MaCAD1基因组成型表达于香蕉各个组织。在耐病和感病品种中,MaCAD1均上调表达,但在耐病品种中MaCAD1在所有时间点相对于对照增加的倍数均高于感病品种,表明MaCAD1基因在香蕉的抗病性中起着重要作用,MaCAD1可以作为一个新的响应枯萎病侵染的标记基因。展开更多
文摘A series of TiO2-SiO2 supported cobalt catalysts were prepared by using the incipient wetness impregnation method,and their activity and selectivity were evaluated for the selective hydrogenation of cinnamaldehyde to cinnamyl alcohol.The effects of Co loading,calcination temperature,reduction temperature and rare earth promoters on the hydrogenation performance of the catalysts were tested.The results showed that the catalytic performance of cobalt catalyst depended on the crystal size of Co on the catalyst surface.The catalyst with bigger Co crystals exhibited higher hydrogenation activity and selectivity of cinnamyl alcohol.The optimal cobalt loading,calcination temperature and reduction temperature of the catalyst for cinnamaldehyde hydrogenation were found to be 15%,823 K and 823 K,respectively.The addition of rare earth La or Ce enhanced the dispersion of Co on the catalyst surface,and increased the catalytic activity.
文摘肉桂醇脱氢酶(CAD)在木质素合成过程中起关键作用。通过RACE(rapid-amplification of cDNA ends)方法从香蕉根系cDNA均一化全长文库中获得一个肉桂醇脱氢酶基因,命名为MaCAD1(GenBank登录号为KF582533)。MaCAD1是香蕉MYB基因编码框全长cDNA,包含一个1 077bp的最大开放阅读框(ORF),编码358个氨基酸。蛋白质序列同源比对发现,其含有完整的醇脱氧酶的典型保守结构域,属于典型的CAD蛋白。系统进化树比对分析表明,MaCAD1与水稻OsCAD6(CAD39907)的亲缘关系较近。组织特异性研究表明MaCAD1基因组成型表达于香蕉各个组织。在耐病和感病品种中,MaCAD1均上调表达,但在耐病品种中MaCAD1在所有时间点相对于对照增加的倍数均高于感病品种,表明MaCAD1基因在香蕉的抗病性中起着重要作用,MaCAD1可以作为一个新的响应枯萎病侵染的标记基因。
