Journal
CHEMICAL ENGINEERING JOURNAL
Volume 377, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2018.07.148
Keywords
Beta zeolite; Conversion; Ethylene-to-propylene; SSZ-13
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Funding
- National Research Council of Science & Technology (NST) grant by the Korea government (MSIT) [CRC-14-1-KRICT]
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For the first time, beta zeolites (IZA code: BEA with 12-membered rings, having a wide range of SiO2/Al2O3) were converted into SSZ-13s (IZA code CHA, having 8-membered rings) in the presence of external silica source (here, Na2SiO3) and N, N, N-trimethyl-1-adamantanamine hydroxide as a structure directing agent. Na2SiO3 was essential for the successful conversion when the parent zeolite beta was Al-rich. The conversion of beta into SSZ-13 zeolite can be explained by the relative stabilities of beta and SSZ-13 zeolites, where pore size had more dominant role than the framework density. The obtained SSZ-13s were highly porous, had both weak and strong acidic sites and composed of tetrahedral aluminum. Finally, the synthesized SSZ-13s were applied in the direct conversion of ethylene-to-propylene (ETP) as a solid catalyst. The results showed that the SSZ-13s, converted from beta, were better or competitive in ETP (especially in the stable conversion of ethylene) against the SSZ-13 (synthesized by using tetraethylammonium hydroxide) that had showed very competitive performances earlier in ETP.
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