Transformation synthesis of aluminosilicate SSZ-39 zeolite from ZSM-5 and beta zeolite

Xu, Hao; Chen, Wei; Wu, Qinming; Lei, Chi; Zhang, Juan; Han, Shichao; Zhang, Ling; Zhu, Qi; Meng, Xiangju; Dai, Daniel; Maurer, Stefan; Parvulescu, Andrei‐Nicolae; Müller, Ulrich; Zhang, Weiping; Yokoi, Toshiyuki; Bao, Xinhe; Marler, Β.; Vos, Dirk De; Kolb, Ute; Zheng, Anmin; Xiao, Feng‐Shou

doi:10.1039/c9ta00174c

Cited by 55 publications

(29 citation statements)

References 77 publications

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“…[1][2][3][4][5] Compared to other zeolites with a larger pore size, small-pore zeolites can stabilize nano-sized noble metal species to show comparably high stability, which is crucial for catalytic reactions under realistic conditions. 3,[6][7][8] Particularly, applications of Pd-impregnated small-pore zeolite catalysts for aer-treatment and hydrogen generation have been successfully demonstrated. 3,6,7 In these cases, various Pd phases such as isolated Pd 2+ ions, Pd, and PdO can exist in the zeolite, all of which show different catalytic activities depending on the reaction.…”

Section: Introductionmentioning

confidence: 99%

“…3,[6][7][8] Particularly, applications of Pd-impregnated small-pore zeolite catalysts for aer-treatment and hydrogen generation have been successfully demonstrated. 3,6,7 In these cases, various Pd phases such as isolated Pd 2+ ions, Pd, and PdO can exist in the zeolite, all of which show different catalytic activities depending on the reaction. [3][4][5]7,9 For example, isolated Pd 2+ ions are active for passive NO x adsorbers (PNAs), 5,9 while most catalytic reactions including catalytic combustion of CH 4 require highly dispersed Pd or PdO nanoparticles for high catalytic activity.…”

Section: Introductionmentioning

confidence: 99%

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Uniform synthesis of palladium species confined in a small-pore zeolite via full ion-exchange investigated by cryogenic electron microscopy

et al. 2021

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Uniform synthesis of palladium species confined in a small-pore zeolite via full ion-exchange investigated by cryogenic electron microscopy

et al. 2021

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“…The initial Na-zeolites (AEI, CHA, and RTH) were synthesized according to the previous literature [17][18][19]. After calcination, the Na-zeolites were ion-exchanged twice with NH 4 NO 3 solution (0.1 M) at 80 ℃ for 5 h to obtain NH 4 -zeolites.…”

Section: Catalyst Synthesismentioning

confidence: 99%

Passive NO Adsorption on Hydrothermally Aged Pd-Based Small-Pore Zeolites

Shan

Sun

et al. 2020

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Pd-based small-pore zeolites with different framework structures (AEI, CHA and RTH) were synthesized by a facile incipient wetness impregnation method. The zeolites were utilized as low-temperature passive NO x adsorbers (PNA) for NO x storage before and after hydrothermal aging. It was found that 1 wt% Pd/AEI showed better PNA behavior than the 1 wt% Pd/ CHA and Pd/RTH samples, regardless of hydrothermal aging at 750 and 800 ℃. The AEI zeolite has a three-dimensional but tortuous pore channel structure, which accelerated Pd dispersion at 750 ℃ but inhibited Pd aggregation at 800 ℃ when subjected to hydrothermal aging. Pd/CHA showed a slight increase in Pd dispersion at 750 ℃, but extensive Pd aggregation at 800 ℃ due to its straight and unhindered three-dimensional pore structure. The Pd species in Pd/RTH zeolite were prone to accumulation during hydrothermal aging due to the two-dimensional pore structure. Therefore, Pd/AEI can be utilized as an efficient and stable PNA after activation by mild hydrothermal aging treatment.

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“…Moreover, given that SSZ-39 has traditionally been synthesized through interzeolite transformation from high-silica Y, of which the preparation is expensive and requires complex post-treatments, Xu et al. successfully synthesized SSZ-39 through interzeolite transformation from low-cost and widely used ZSM-5 and beta zeolites [ 103 ]. In summary, Cu-SSZ-39 zeolite exhibits strong potential as an NH 3 -SCR catalyst for actual application due to its optimal deNO x efficiency and outstanding hydrothermal stability.…”

Section: Other Small-pore Zeolites Applied To Nh 3 -Scrmentioning

confidence: 99%

Selective catalytic reduction of NOx with NH3: opportunities and challenges of Cu-based small-pore zeolites

Shan

Zhang

et al. 2021

National Science Review

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188

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Zeolites, as efficient and stable catalysts, are widely used in the environmental catalysis field. Typically, Cu-SSZ-13 with small-pore structure shows excellent catalytic activity for selective catalytic reduction of NOx with ammonia (NH3-SCR) as well as high hydrothermal stability. This review summarizes major advances in Cu-SSZ-13 applied to the NH3-SCR reaction, including the state of copper species, standard and fast SCR reaction mechanism, hydrothermal deactivation mechanism, poisoning resistance, and synthetic methodology. The review gives a valuable summary of new insights on the matching between SCR catalyst design principles and the characteristics of Cu2+-exchanged zeolitic catalysts, highlighting the significant opportunity presented by zeolite-based catalysts. Principles for designing zeolites with excellent NH3-SCR performance and hydrothermal stability are proposed. On the basis of these principles, more hydrothermally stable Cu-AEI and Cu-LTA zeolites are elaborated as well as other alternative zeolites applied to NH3-SCR. Finally, we call attention to the challenges facing Cu-based small-pore zeolites that still need to be addressed.

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Transformation synthesis of aluminosilicate SSZ-39 zeolite from ZSM-5 and beta zeolite

Abstract: Aluminosilicate SSZ-39 zeolite has been prepared by transformation from ZSM-5 and beta zeolite in the presence of N,N-diethyl-cis-2,6-dimethylpiperidinium hydroxide.

Cited by 55 publications

References 77 publications

Uniform synthesis of palladium species confined in a small-pore zeolite via full ion-exchange investigated by cryogenic electron microscopy

Uniform synthesis of palladium species confined in a small-pore zeolite via full ion-exchange investigated by cryogenic electron microscopy

Passive NO Adsorption on Hydrothermally Aged Pd-Based Small-Pore Zeolites

Selective catalytic reduction of NOx with NH3: opportunities and challenges of Cu-based small-pore zeolites

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