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对镍取代合成云母蒙脱石(NiSMM)的孔结构和酸性质进行了表征,并和其它几种催化材料进行了对比。实验数据表明,正戊烷和正已烷在NiSMM中的晶内扩散系数比在稀土Y型分子筛(REY)中要大数倍;比在交联蒙脱土(CLS)中要小1～2个数量级。随着进入层状结构的镍含量的增加,NiSMM的表面酸量增加,其中强酸量的增加幅度大于弱酸量。NiSMM的强酸数量仅决于氢型丝光沸石(HM),而多于氢Y型分子筛(HY)和CLS。NiSMM既有来自三配位Al的Lewis酸,也有来自层间羟基的Bronsted酸。Ni含量增加时,Lewis酸量增加而Bronsted酸量下降。
The pore structure and acid properties of nickel-substituted mica montmorillonite (NiSMM) were characterized and compared with several other catalytic materials. The experimental data show that the intracrystalline diffusion coefficient of n-pentane and n-hexane in NiSMM is several times larger than that in rare-earth Y zeolite (REY) and smaller than 1-2 in CLS Magnitude. With the increase of nickel content into the layered structure, the surface acidity of NiSMM increased, in which the amount of strong acid increased more than the amount of weak acid. The strong acid number of NiSMM depends only on hydrogen mordenite (HM), but more than hydrogen Y zeolite (HY) and CLS. NiSMM has both Lewis acids from the tridentate Al and Bronsted acids from the interlayer hydroxyl groups. As the Ni content increases, the Lewis acid content increases and the Bronsted acid content decreases.