加氢异构化催化剂的研究——酸性能的影响

发布时间：2018-02-28 09:45

本文关键词： ZSM- ZSM- 加氢异构化正癸烷多支链异构体　出处：《石油学报(石油加工)》2017年05期 　论文类型：期刊论文

【摘要】：以具有不同硅/铝摩尔比的ZSM-12和ZSM-22分子筛为研究对象,采用XRD、XRF、N2吸附、吡啶吸附和SEM等分析工具对合成的分子筛样品进行了详细的表征。结果表明,所用分子筛为纯相晶体且Al原子完全处于分子筛骨架中;分子筛Br9nsted酸中心数量和强度随硅/铝摩尔比变化而改变。以正癸烷为模型化合物对制备的催化剂进行加氢异构化反应评价。结果表明,分子筛的酸性中心数量是影响催化剂活性的主要因素;在低转化率(85%)下,Br9nsted酸中心数量对催化剂异构选择性的影响要大于强Br9nsted酸中心的比例。另一方面,研究结果也表明,即使分子筛酸性质相同,如果分子筛孔径不同,相应催化剂所表现出来的催化活性和选择性也是不相同的。
[Abstract]:The ZSM-12 and ZSM-22 molecular sieves with different molar ratios of Si / Al were used to characterize the synthesized molecular sieve samples by means of XRDI XRFN 2 adsorption, pyridine adsorption and SEM. The molecular sieve used is pure phase crystal and Al atom is completely in the framework of molecular sieve. The number and strength of the acid sites of molecular sieve Br9nsted varied with the molar ratio of Si / Al. The hydroisomerization of the catalyst was evaluated using n-decane as the model compound. The number of acidic sites of molecular sieve is the main factor affecting the activity of the catalyst, and the number of Br9nsted acid sites has more influence on the isomerism selectivity of the catalyst than that of the strong Br9nsted acid sites at low conversion rate of 855.On the other hand, the results also show that, Even if the acid properties of the molecular sieve are the same, the catalytic activity and selectivity of the corresponding catalysts are different if the pore size of the molecular sieve is different.
【作者单位】：中国石化石油化工科学研究院;
【分类号】：TE624.9

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