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Seeds Promoted Interzeolite Transformation of USY and Fumed Silica to Long-Lifetime SSZ-13 Catalysts in Methanol-to-Olefins Reaction via a Grinding Route
https://orcid.org/https://orcid.org/0000-0002-4552-9288
https://orcid.org/https://orcid.org/0000-0003-1695-4223
https://orcid.org/https://orcid.org/0000-0003-3181-6275
https://orcid.org/https://orcid.org/0000-0002-2262-0564
https://orcid.org/https://orcid.org/0000-0001-9683-3223
https://orcid.org/https://orcid.org/0000-0002-0328-5254
https://orcid.org/https://orcid.org/0000-0002-6683-3801
Two different seed crystals (K–CHA and nano-scaled SAPO-34) were used to promote the rapid interzeolite conversion of USY and fumed silica to pure SSZ-13 zeolite phase via a grinding route. The results show that both seeds can shorten the crystallization time of SSZ-13 zeolite to 24h, which is much shorter than the syntheses in the absence of seeds. The phase purity, morphology, textural parameters, elemental compositions and acid properties of two typical H–SSZ-13 samples with seeds were analyzed by XRD, SEM, N2 physisorption, EDS and NH3–TPD techniques in detail, and compared with the sample without seeds and a reference sample. The results indicate that the introduction of seeds can effectively modify the acid properties of H–SSZ-13, especially their medium strong acid sites. The methanol-to-olefins (MTO) reaction was employed as a probe to evaluate the catalytic stability of above four H–SSZ-13 catalysts. The results reveal that the catalytic lifetime of the two catalysts using seeds is much longer than that of the one without seeds and the reference sample H–SSZ-13–RS. It was speculated that the appropriate concentration of medium strong acid sites may play a pivotal role in prolonging their catalytic lifetime. Here our findings may throw light on the rational design of long-lifetime H-SSZ-13 catalysts in the MTO reaction.
Seeds Promoted Interzeolite Transformation of USY and Fumed Silica to Long-Lifetime SSZ-13 Catalysts in Methanol-to-Olefins Reaction via a Grinding Route
https://orcid.org/https://orcid.org/0000-0002-4552-9288
https://orcid.org/https://orcid.org/0000-0003-1695-4223
https://orcid.org/https://orcid.org/0000-0003-3181-6275
https://orcid.org/https://orcid.org/0000-0002-2262-0564
https://orcid.org/https://orcid.org/0000-0001-9683-3223
https://orcid.org/https://orcid.org/0000-0002-0328-5254
https://orcid.org/https://orcid.org/0000-0002-6683-3801
Two different seed crystals (K–CHA and nano-scaled SAPO-34) were used to promote the rapid interzeolite conversion of USY and fumed silica to pure SSZ-13 zeolite phase via a grinding route. The results show that both seeds can shorten the crystallization time of SSZ-13 zeolite to 24h, which is much shorter than the syntheses in the absence of seeds. The phase purity, morphology, textural parameters, elemental compositions and acid properties of two typical H–SSZ-13 samples with seeds were analyzed by XRD, SEM, N2 physisorption, EDS and NH3–TPD techniques in detail, and compared with the sample without seeds and a reference sample. The results indicate that the introduction of seeds can effectively modify the acid properties of H–SSZ-13, especially their medium strong acid sites. The methanol-to-olefins (MTO) reaction was employed as a probe to evaluate the catalytic stability of above four H–SSZ-13 catalysts. The results reveal that the catalytic lifetime of the two catalysts using seeds is much longer than that of the one without seeds and the reference sample H–SSZ-13–RS. It was speculated that the appropriate concentration of medium strong acid sites may play a pivotal role in prolonging their catalytic lifetime. Here our findings may throw light on the rational design of long-lifetime H-SSZ-13 catalysts in the MTO reaction.
Seeds Promoted Interzeolite Transformation of USY and Fumed Silica to Long-Lifetime SSZ-13 Catalysts in Methanol-to-Olefins Reaction via a Grinding Route
https://orcid.org/https://orcid.org/0000-0002-4552-9288
https://orcid.org/https://orcid.org/0000-0003-1695-4223
https://orcid.org/https://orcid.org/0000-0003-3181-6275
https://orcid.org/https://orcid.org/0000-0002-2262-0564
https://orcid.org/https://orcid.org/0000-0001-9683-3223
https://orcid.org/https://orcid.org/0000-0002-0328-5254
https://orcid.org/https://orcid.org/0000-0002-6683-3801
Two different seed crystals (K–CHA and nano-scaled SAPO-34) were used to promote the rapid interzeolite conversion of USY and fumed silica to pure SSZ-13 zeolite phase via a grinding route. The results show that both seeds can shorten the crystallization time of SSZ-13 zeolite to 24h, which is much shorter than the syntheses in the absence of seeds. The phase purity, morphology, textural parameters, elemental compositions and acid properties of two typical H–SSZ-13 samples with seeds were analyzed by XRD, SEM, N2 physisorption, EDS and NH3–TPD techniques in detail, and compared with the sample without seeds and a reference sample. The results indicate that the introduction of seeds can effectively modify the acid properties of H–SSZ-13, especially their medium strong acid sites. The methanol-to-olefins (MTO) reaction was employed as a probe to evaluate the catalytic stability of above four H–SSZ-13 catalysts. The results reveal that the catalytic lifetime of the two catalysts using seeds is much longer than that of the one without seeds and the reference sample H–SSZ-13–RS. It was speculated that the appropriate concentration of medium strong acid sites may play a pivotal role in prolonging their catalytic lifetime. Here our findings may throw light on the rational design of long-lifetime H-SSZ-13 catalysts in the MTO reaction.
Seeds Promoted Interzeolite Transformation of USY and Fumed Silica to Long-Lifetime SSZ-13 Catalysts in Methanol-to-Olefins Reaction via a Grinding Route
Pet. Chem.
Hao, Zongyi (author) / Niu, Li (author) / Long, Xuefeng (author) / Li, Hongwei (author) / Wang, Dongliang (author) / Ji, Dong (author) / Zhao, Xinhong (author)
Petroleum Chemistry ; 62 ; 962-971
2022-08-01
10 pages
Article (Journal)
Electronic Resource
English
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