本文選題：CHA沸石　切入點(diǎn)：固相合成　出處：《東華理工大學(xué)》2017年碩士論文　論文類(lèi)型：學(xué)位論文

【摘要】：沸石分子篩作為催化劑在環(huán)境保護(hù)和石油化工領(lǐng)域的有著廣泛的應(yīng)用。在SSZ-13沸石骨架中,體積較大的CHA籠由八元環(huán)孔道彼此連接起來(lái),形成三維的孔道結(jié)構(gòu)。近期,人們發(fā)現(xiàn)SSZ-13分子篩在消除空氣中氮氧化物和甲醇制烯烴方面有良好的催化作用。然而,合成SSZ-13分子篩具有模板劑價(jià)格高昂,反應(yīng)周期長(zhǎng),產(chǎn)率低和難以合成高硅鋁比產(chǎn)物的問(wèn)題。為克服這些問(wèn)題,我們分別應(yīng)用了無(wú)溶劑固相合成路線和使用氟離子體系合成高硅沸石的方法。在第二章中,使用一種廉價(jià)的模板劑,在無(wú)溶劑固相條件下將成功的將FAU沸石轉(zhuǎn)化為CHA沸石,得到的產(chǎn)物結(jié)晶度高,粒徑分布均勻,同時(shí)其產(chǎn)率高達(dá)94%以上。與傳統(tǒng)方法生產(chǎn)的SSZ-13沸石相比,在NH3-SCR反應(yīng)中表現(xiàn)出同等的催化性能。在第三章中,在氟體系下合成了高硅鋁比(Si/Al=100)的CHA沸石,甲醇制烯烴(MTO)測(cè)試表明具有很高的轉(zhuǎn)化率和烯烴選擇性。
[Abstract]:Zeolites as catalysts are widely used in the field of environmental protection and petrochemical industry. In the framework of SSZ-13 zeolite, the larger CHA cages are connected with each other by octa-ring channels to form three-dimensional pore structures. It has been found that SSZ-13 molecular sieve has a good catalytic effect in eliminating nitrogen oxides and methanol to olefin in air. However, the synthesis of SSZ-13 molecular sieve has high cost of template agent and long reaction period. In order to overcome these problems, solvent-free solid state synthesis and fluorine ion system were used to synthesize high silica zeolites. In Chapter 2, a cheap template was used. FAU zeolites were successfully transformed into CHA zeolites under solvent-free solid state conditions. The obtained products have high crystallinity and uniform particle size distribution, and the yield of SSZ-13 zeolites is over 94%. In chapter 3, CHA zeolites with high Si-Al / Al ratio of Si / Al ~ (100) were synthesized in fluorine system. The results of methanol-to-olefin synthesis showed high conversion and olefin selectivity.
【學(xué)位授予單位】：東華理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：O643.36

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本文編號(hào)：1640285