采用水热法合成了比表面积分别为34和87m~2/g的ZrO_2样品(分别记为ZrO_2-34和ZrO_2-87),并考察了它们作分散剂时Ru-Zn催化剂上苯选择加氢制环己烯反应的件能.结果表明,两个ZrO_2样品具有相近的纯度和物相,晶粒粒径分别为21.6和11.4am.其中ZrO_2-34具有较小的比表面积、较大的孔径、较小的粒径、集中的粒度分布和较大的堆密度,因而更适合用作苯选择加氧制环己烯Ru-Zn催化剂的分散剂,且循环使用多次催化剂仍表现出较高的选择性和稳定性.
Nanosized zirconia was prepared by hydrothermal synthesis. The effect of zirconia with surface areas of 34 and 87 m~2/g (denoted ZrO_2-34 and ZrO_2-87, respectively) used as a dispersant on the catalytic performance of the Ru-Zn catalyst was investigated. The crystallite sizes of ZrO_2-34 and ZrO_2-87 were 21.6 and 11.4 nm, respectively. The two samples had similar purity and phases. Cyclohexene selectivity and the stability of the Ru-Zn catalyst dispersed using ZrO_2-34 were better than that using 2rO_2-87. This was due to the smaller surface area, bigger pore diameter, smaller particle size, narrower particle distribution, and bigger bulk density of ZrO_2-34.
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