Preparation and synergetic catalytic effects of amino-functionalized MCM-41 catalysts

Four amine functionalized mesoporous catalysts were synthesized by grafting primary, dualistic and two secondary amines onto the channel walls of mesoporous silica, MCM-41. We examined the effects of organoamine loading amount on the acid-base synergism of the catalysts in the self-condensation reaction of n-butanal, a Knoevenagel condensation and a Henry reaction. We observed the balance of the amine and residual silanol amounts is crucial to the catalytic performances of the functionalized mesoporous catalysts. An optimum organoamine loading amount exists, which is dependent on the organoamine type. There is little difference in the optimum organoamine loading amount between different reactions. The secondary organoamine functionalized MCM-41 exhibits the best catalytic performance in the experimental range.     

间接电解氧化法合成正丁醛

提出了一种合成正丁醛的新方法———间接电解氧化法 .在陶瓷隔膜电解槽中 ,用Pb/PbO2 作阳极 ,石墨作阴极 ,将Mn2 + 氧化成Mn3 + ,然后用Mn3 + 作氧化剂对正丁醇进行氧化获得正丁醛 ,还原所得的Mn2 + 可循环利用 .电解的优选条件为 :C硫酸 =4 .0mol/L ,电流密度 80 0A/m2 ,CMn(II) =0 .5mol/L ,温度t=2 0℃ .