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以有机改性后的十六烷基三甲基溴化铵柱撑蒙脱石(CTAB-MMT)为载体,t采用浸渍法制备了Ni/MMT催化剂.通过傅里叶红外光谱、X射线衍射、H2程序升温脱附、N2物理吸附以及紫外漫散射等物理化学手段对催化剂进行了表征;并结合微型高压反应釜萘加氢反应,t评价了催化剂的加氢性能.结果表明,t有机改性显著改善了Ni/MMT催化剂的金属Ni分散度和织构性质,t且所制催化剂表现出优异的萘加氢性能,tNi萘转化率达到88.2%,t不仅远高于未处理催化剂(13.1%)和Al2O3柱撑处理催化剂(24.2%),t而且高于Ni/SBA-15催化剂(68.2%).鉴于CTAB有机柱撑体在催化剂还原过程因热解而消除,t其对催化剂所起的作用主要发生于浸渍过程,t提出了有机改性在浸渍过程对Ni/MMT催化剂的促进作用机制.
Ni / MMT catalyst was prepared by impregnation method using organically modified cetyl trimethyl ammonium bromide pillared montmorillonite (CTAB-MMT) as support.FTIR, X-ray diffraction The results showed that the catalysts were characterized by means of physico-chemical methods such as temperature-programmed desorption, temperature-programmed desorption by H2, N2 physisorption and UV diffuse scattering. The hydrogenation performance of the catalyst was evaluated by the naphthalene hydrogenation reaction of the autoclave. t organic modification significantly improved the Ni / MMT catalyst metal Ni dispersion and texture properties, t and the catalyst showed excellent naphthalene hydrogenation performance, nNi naphthalene conversion reached 88.2%, not only far higher (13.1%) and Al2O3 pillared catalyst (24.2%), and higher than that of Ni / SBA-15 catalyst (68.2%). In view of the fact that CTAB organic pillared is eliminated by pyrolysis during the catalyst reduction process , t its role in the catalyst mainly occurs in the impregnation process, t proposed organic modification in the impregnation process on the promotion of Ni / MMT catalyst mechanism.