A study on synthesis of ZSM-5 zeolite with enhanced hydrothermal stability for naphtha catalytic cracking = 증진된 수열안정성을 가지는 납사 접촉분해반응용 ZSM-5 분자체 합성 연구

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ZSM-5 was synthesized by template-free method usi/ng nano-sized crystalline ZSM-5 as a seed and sodium silicate as a silica source. The uniform ZSM-5 crystals with relative crystallinity higher than 100 % could be obtained successfully by the seeding method. To guaranty uniform and crystalline ZSM-5, the nano-sized crystalline seed in the range of 100 nm should be used. The crystal size of ZSM-5 could be controlled easily by the content of seed in mother slurry. The windows of $Na_2O/SiO_2$ and $Al_2O_3/SiO_2$ of mother slurry could be expanded by the introduction of crystalline seed even in template-fee synthesis of ZSM-5 with sodium silicate. The ZSM-5 prepared in the presence of nano-sized crystalline seed also revealed higher hydrothermal stability than those prepared without seed. To compare the catalytic activity of synthesized and commercial ZSM-5, a series of P modified ZSM-5 was prepared using $H_3PO_4$ solution and was evaluated after steaming in a severe condition. The synthesized ZSM-5 shows higher activity than commercial one in naphtha cracking. Finally, enhanced catalytic performance of synthesized ZSM-5 using crystalline seed was confirmed in fluidized bed re-actor. The catalysts were characterized by XRD, Ar adsorption, $^{27} Al$ and $^{31} P MAS NMR$ , $NH_3-TPD$ . Results showed that to obtain the higher hydrothermal stable acid sites, it is important to have the structural stability of framework in ZSM-5 zeolites.
Advisors
Woo, Seong Ihlresearcher우성일researcherPark, Young-Kiresearcher박용기researcher
Description
한국과학기술원 :생명화학공학과,
Publisher
한국과학기술원
Issue Date
2016
Identifier
325007
Language
eng
Description

학위논문(박사) - 한국과학기술원 : 생명화학공학과, 2016.8 ,[xiv, 119 p :]

Keywords

nano-sized crystalline seed; sodium silicate; template-free; high hydrothermal stability; phosphrous; 나노크기의 결정성 씨드; 물유리; 고수열안정성; 인; 납사분해능

URI
http://hdl.handle.net/10203/222167
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=663112&flag=dissertation
Appears in Collection
CBE-Theses_Ph.D.(박사논문)
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