ZSM-5分子筛铝分布的研究方法

发布时间：2018-03-10 14:18

本文选题：ZSM-分子筛　切入点：铝分布　出处：《石油化工》2017年12期 　论文类型：期刊论文

【摘要】：按凝胶中硅铝比分别为40和80,合成了板状和球形两种形貌的ZSM-5分子筛。通过将~(27)Al MAS NMR、Co(Ⅱ)离子交换能力及UV-Vis-DRS技术相结合表征了孤立铝和铝对的含量及骨架铝原子的落位信息;采用~(29)Si MAS NMR技术表征了骨架中Si(nSi,(4-n)Al)(n=0~4)序列群体;采用XPS结合XRF表征了ZSM-5分子筛体相、表面和内部的铝分布,并对上述表征骨架铝分布的方法进行了对比。结合多种表征技术,确定了合成的ZSM-5分子筛的铝分布和落位,确定了ZSM-5分子筛骨架中Al的化学环境,为构建ZSM-5分子筛的铝分布和落位与反应性能的关系提供了数据支持。
[Abstract]:ZSM-5 molecular sieves with plate-like and spherical morphology were synthesized according to Si / Al ratios of 40 and 80 respectively. The ion-exchange ability and UV-Vis-DRS technique were combined to characterize the contents of isolated aluminum and aluminum pairs and the location information of skeleton aluminum atoms. MAS NMR technique was used to characterize the sequence population of SinSiO4, XPS and XRF were used to characterize the bulk phase, surface and internal aluminum distribution of ZSM-5 molecular sieve, and the methods to characterize the distribution of skeleton aluminum were compared. The aluminum distribution and location of the synthesized ZSM-5 molecular sieve and the chemical environment of Al in the framework of ZSM-5 molecular sieve were determined, which provided data support for the construction of the Al distribution of ZSM-5 molecular sieve and the relationship between the Al distribution and the reaction performance.
【作者单位】：北京石油化工学院化学工程系;北京低碳清洁能源研究所;
【分类号】：O643.36

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