TS-1分子筛的合成及其催化性能

发布时间：2018-06-21 01:36

本文选题：钛硅分子筛 + TS-1　；参考：《华东师范大学》2016年硕士论文

【摘要】：TS-1分子筛作为一个重要的绿色催化剂在工业应用上极具优势和价值。八十年代以来,大量科研工作者为了降低TS-1分子筛的合成成本,改善钛的配位状态,获得廉价高性能的TS-1分子筛做了大量的工作,取得了出色的成绩,扩展了TS-1分子筛在工业上的应用价值。本文在前人的研究工作基础上,从廉价合成路线出发,通过的合成配方的调控和步骤的控制,采用较为廉价的四丙基溴化铵(TPABr)部分取代四丙基氢氧化铵(TPAOH)作为模板剂,并控制总的TPA+使用量,成功合成得到结晶度相对较好的微米级板块状TS-1分子筛(Brick TS-1)。这种微米级的Brick TS-1晶粒为单晶,在十元环直形孔道所在的b轴方向较薄,对于发生于直形孔道内的反应具有较小的传质阻力,有利于提高微米尺寸的TS-1分子筛的催化效果。在此基础上本文通过适量的NaOH部分取代TPAOH对合成得到的BrickTS-1进行廉价的后处理改性,生成大量介孔的同时避免了Ti的中毒,且在板块表面具有更高的Ti的含量,获得了较高的催化性能。同时我们尝试在TS-1分子筛的合成溶胶中加入少量的蔗糖,获得了尺寸相对较小的晶化较好的Brick TS-1分子筛样品,其催化性能与传统合成方法得到的纳米级TS-1分子筛基本一致。我们也尝试进行Al-TS-1的合成和研究。这些都丰富了TS-1分子筛的廉价合成方法,促进了TS-1分子筛的廉价化发展。
[Abstract]:As an important green catalyst, TS-1 molecular sieve has great advantage and value in industrial application. In order to reduce the cost of synthesis of TS-1 molecular sieve and improve the coordination state of titanium, a large number of researchers have done a lot of work since 1980s to obtain TS-1 molecular sieve with low cost and high performance. The application value of TS-1 molecular sieve in industry is expanded. In this paper, based on the previous research work, based on the cheap synthesis route, the cheap tetrapropylammonium bromide (TPABr) partially substituted tetrapropylammonium hydroxide (TPAOH) was used as the template through the regulation of the synthesis formula and the control of the steps. Under the control of the total amount of TPA, the relatively good crystallinity of micrometer TS-1 molecular sieve Brick TS-1 was obtained. The micron Brick TS-1 grain is a single crystal, which is thin in the direction of b axis in the straight channel of ten member ring, and has smaller mass transfer resistance to the reaction occurring in the straight channel, which is helpful to improve the catalytic effect of TS-1 molecular sieve with micron size. On this basis, the synthesized BrickTS-1 was modified by partial substitution of TPAOH with proper amount of NaOH, which resulted in the formation of a large number of mesoporous cells and the prevention of Ti poisoning, and the higher Ti content on the surface of the plate. High catalytic performance was obtained. At the same time, we tried to add a small amount of sucrose to the synthesis sol of TS-1 molecular sieve, and obtained BTSK-1molecular sieve samples with relatively small size and better crystallization. The catalytic activity of these samples was basically the same as that obtained by the traditional synthesis method of TS-1 molecular sieve. We also try to synthesize and study Al-TS-1. All these have enriched the cheap synthesis method of TS-1 molecular sieve and promoted the development of TS-1 molecular sieve's cheap synthesis.
【学位授予单位】：华东师范大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：O643.36

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