Green synthesis of Cu-SSZ-13 zeolite by seed-assisted route for effective reduction of nitric oxide

Zhang, Xinyan; Dou, Ting-Ting; Wang, Yao; Yang, Jingyue; Wang, Xue; Guo, Yali; Zhang, Shaoqing

doi:10.1016/j.jclepro.2019.117667

Cited by 20 publications

(2 citation statements)

References 39 publications

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“…Polymer hydrogels are three-dimensional networks of polymer chains that are crosslinked by physical means, which can be used as microreactors or nano-reactors to control the nucleation, assembly, and growth of zeolite (Li 2016;Zhu 2016). By combining TMADaOH and C 22 − 4−4 Br 2 in the gelation process, hierarchical pore SSZ-13 molecular sieve was synthesized in one step (Zhang 2019).…”

Section: Introductionmentioning

confidence: 99%

Facile and Rapid Synthesis of Durable SSZ-13 Catalyst Using Choline Chloride Template for Methanol-to-Olefins

Lin

Yang

et al. 2021

Preprint

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In this study, a facile and rapid synthesis approach for SSZ-13 catalyst was proposed using choline chloride (CC) as template. The optimal synthesis condition was explored, and the catalytic performance for methanol-to-olefins (MTO) was examined. Results revealed that the appropriate ratio of soft template could meet the condition for rapid and ordered growth of catalyst crystals. Using environmentally friend and cheaper CC as template could greatly accelerate the formation of bi-hexagonal ring structure in SSZ-13 framework, and it could shorten the synthesis cycle to within 4 h. With a proper amount of CC addition (i.e., m(CC)/m(SiO2) = 0.14), uniform and homogeneously distributed cubic SSZ-13 crystals were obtained with relatively lower aggregation. The catalyst synthesized with m(CC)/m(SiO2)=0.14 demonstrated excellent porous features with a total specific surface area and mesopore volume of 641.706 m2.g-1 and 0.0377 cm3.g-1, respectively. The optimized strong and weak acid sites on the SSZ-13 were obtained by regulating the m(CC)/m(SiO2). As a typical acid catalytic reaction, the SSZ-13 catalyst with strong and weak acid sites exhibited bi-functional role. The lower amount of strong acid sites and larger amount of weak acid sites in the synthesized catalyst were conducive to the catalytic performance for MTO under relatively lower reaction temperature (450 oC). Consequently, the synthesized SSZ-13 showed a better conversion rate and lifetime than that of purchased one. The methanol conversion rate using synthesized catalyst was maintained over 95% within 120 min, and its lifetime was achieved to 172 min. The appropriate acidity and well-developed pore structure of synthesized SSZ-13 could slow down the carbon deposition rate and significantly increase the lifetime of the catalyst. Moreover, the initial selectivity of light olefin could maintain above 50% within 160 min. Eventually, the desirable features of synthesized SSZ-13 catalyst were thought be with good potential for industrial application.

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Section: Introductionmentioning

confidence: 99%

Facile and Rapid Synthesis of Durable SSZ-13 Catalyst Using Choline Chloride Template for Methanol-to-Olefins

Lin

Yang

et al. 2021

Preprint

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show abstract

“…They can be used as micro-or nano-reactors to control the nucleation, assembly, and growth of zeolites [12,13]. By combining TMADaOH and C 22-44 Br 2 (2 bromo-n-22~44 alkane) in the gelation process, a hierarchical pore SSZ-13 molecular sieve was synthesized in one step [14]. However, such methods were usually with a high synthesis cost and low yield, which hindered its further industrial production.…”

Section: Introductionmentioning

confidence: 99%

Facile and Rapid Synthesis of Durable SSZ-13 Catalyst Using Choline Chloride Template for Methanol-to-Olefins Reaction

Lin

Yang

et al. 2021

Catalysts

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In the current study, a facile and rapid synthesis approach for a SSZ-13 catalyst using choline chloride (CC) as a template was proposed, and the catalytic performance for the methanol-to-olefins (MTO) reaction was examined. With a proper amount of CC addition (i.e., m(CC)/m(SiO2)=0.14), uniform and homogeneously distributed cubic SSZ-13 crystals were obtained within 4 h with lower aggregation. The synthesized catalyst demonstrated excellent porous features with a total specific surface area and mesopore volume of 641.71 m2·g−1 and 0.04 cm3·g−1, respectively. The optimized strong and weak acid sites on SSZ-13 were obtained by regulating the m(CC)/m(SiO2) ratio. The less strong acid sites and a larger amount of weak acid sites in the synthesized catalyst were conducive to the catalytic performance of the MTO reaction under a lower reaction temperature (450 °C). The appropriate acidity and well-developed pore structure of synthesized SSZ-13 could also slow down the carbon deposition rate and, thus, significantly improve the catalytic lifetime of the catalyst. The methanol conversion rate and initial selectivity of light olefin using the synthesized catalyst could maintain over 95% and 50%, respectively, and a lifetime of 172 min was achieved. Although the low olefin selectivity of the synthesized SSZ-13 catalyst was slightly lower than that of the purchased one, its desirable features were thought to have good potential for industrial application.

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Review of Recent After-Treatment Technologies for De-NOx Process in Diesel Engines

Choi

Lee

Son³

2020

Int.J Automot. Technol.

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Green synthesis of Cu-SSZ-13 zeolite by seed-assisted route for effective reduction of nitric oxide

Cited by 20 publications

References 39 publications

Facile and Rapid Synthesis of Durable SSZ-13 Catalyst Using Choline Chloride Template for Methanol-to-Olefins

Facile and Rapid Synthesis of Durable SSZ-13 Catalyst Using Choline Chloride Template for Methanol-to-Olefins

Facile and Rapid Synthesis of Durable SSZ-13 Catalyst Using Choline Chloride Template for Methanol-to-Olefins Reaction

Review of Recent After-Treatment Technologies for De-NOx Process in Diesel Engines

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