摘要
分别以复合分子筛HY-silicalite-1、HY和Hsilicalite-1的机械混合物、HY为载体,浸渍活性金属,制备了双功能催化剂Ni-Mo/HY-silicalite-1、Ni-Mo/HY+Hsilicalite-1和Ni-Mo/HY,探讨了其物化性能和催化性能的差异,并与其相应单功能催化剂载体的物化性能和催化性能进行了比较。结果表明,复合分子筛催化剂Ni-Mo/HY-silicalite-1和HY-silicalite-1均同时含有silicalite-1和Y型分子筛两种晶相;其比表面积和孔体积均小于相应的纯Y型分子筛及其机械混合物;NH3-TPD结果表明与Y型分子筛相比,两种催化剂均表现出明显的弱酸和强酸位。在固定床反应器上考察了各催化剂对正辛烷加氢裂化反应的催化性能,在其它操作条件相同时,正辛烷在各催化剂上加氢裂化转化率和裂解率的排列顺序为Ni-Mo/HY-silicalite-1>HY-silicalite-1≈Ni-Mo/HY+Hsilicalite-1>Ni-Mo/HY>HY≈HY+Hsilicalite-1,Ni-Mo/HY-silicalite-1和HY-silicalite-1均对直链烷烃具有一定的选择性。
Bifunctional catalysts Ni-Mo/HY-silicalite-1, Ni-Mo/HY＋Hsilicalite-1, Ni-Mo/HY were respectively prepared by the impregnation method with HY or the mixture of HY-silicalite-1, HY and Hsilicalite-1 as a carrier. Physical and chemical properties as well as catalytic performance of the bifunctional catalysts were studied. The results showed that all of XRD characteristic peaks of Y and silicalite were observed on the composite zeolite catalysts Ni-Mo/HY-silicalite-1 and HY-silicalite-1. Compared with the pure Y zeolite and its mixture, the surface area and pore volume of Ni-Mo/HY-silicalite-1 and HY-silicalite-1 were smaller respectively. The results of NH3-TPD showed that both the composite zeolites had weak acid sites and strong acid sites. Then the performance of these catalysts for hydrocracking of n-octane was studied in a fixed bed stainless steel tubular reactor. The evaluation result showed that, under the same conditions, the orders of conversion and hydrocracking rate of n-octane were Ni-Mo/HY-silicalite-1〉HY-silicalite-1≈Ni-Mo/HY＋Hsilicalite-1〉Ni-Mo/HY〉HY≈HY＋Hsilicalite-1. Ni-Mo/HY-silicalite-1 and HY-silicalite-1 showed well n-paraffin selectivity.
出处
《当代化工》
CAS
2013年第11期1511-1515,共5页
Contemporary Chemical Industry
