Developing silicalite-1 encapsulated Ni nanoparticles as sintering-/coking-resistant catalysts for dry reforming of methane
Developing silicalite-1 encapsulated Ni nanoparticles as sintering-/coking-resistant catalysts for dry reforming of methane
Authors (12): S. Xu, T. J. A. Slater, H. Huang, Y. Zhou, Y. Jiao, C. M. A. Parlett, S. Guan, S. Chansai, S. Xu, X. Wang, C. Hardacre, X. Fan
Themes: Water-Energy
DOI: 10.1016/j.cej.2022.137439
Citations: 52
Pub type: journal-article
Pub year: 2022

Publisher: Elsevier BV

Issue:

License: [{"start"=>{"date-parts"=>[[2022, 10, 1]], "date-time"=>"2022-10-01T00:00:00Z", "timestamp"=>1664582400000}, "content-version"=>"tdm", "delay-in-days"=>0, "URL"=>"https://www.elsevier.com/tdm/userlicense/1.0/"}, {"start"=>{"date-parts"=>[[2022, 6, 7]], "date-time"=>"2022-06-07T00:00:00Z", "timestamp"=>1654560000000}, "content-version"=>"vor", "delay-in-days"=>0, "URL"=>"http://creativecommons.org/licenses/by/4.0/"}]

Publication date(s): 2022/10 (online)

Pages: 137439

Volume: 446 Issue:

Journal: Chemical Engineering Journal

Link: [{"URL"=>"https://api.elsevier.com/content/article/PII:S1385894722029278?httpAccept=text/xml", "content-type"=>"text/xml", "content-version"=>"vor", "intended-application"=>"text-mining"}, {"URL"=>"https://api.elsevier.com/content/article/PII:S1385894722029278?httpAccept=text/plain", "content-type"=>"text/plain", "content-version"=>"vor", "intended-application"=>"text-mining"}]

URL: http://dx.doi.org/10.1016/j.cej.2022.137439

The stability of catalysts in dry reforming of methane (DRM) is a known issue. In this paper an encapsulation strategy has been employed to improve the stability compared with conventional impregnation methods. Herein, nickel nanoparticles encapsulated in silicalite-1 were prepared using a range of methods including post treatment, direct hydrothermal and seed-directed methods to investigate the effect of synthesis protocol on the properties of catalysts, such as degree of encapsulation and Ni dispersion, and anti-coking/-sintering performance in DRM. The Ni@SiO2-S1 catalysts obtained by the seed-directed synthesis presented the full encapsulation of Ni NPs by the zeolite framework with small particle sizes (∼2.9 nm) and strong metal-support interaction, which could sterically hinder the migration/aggregation of Ni NPs and carbon deposition. Therefore, Ni@SiO2-S1 showed stable CO2/CH4 conversions of 80% and 73%, respectively, with negligible metal sintering and coking deposition (∼0.5 wt%) over 28 h, which outperformed the other catalysts prepared. In contrast, the catalysts developed by the post-treatment and ethylenediamine-protected hydrothermal methods showed the co-existence of Ni phase on the internal and external surfaces, i.e. incomplete encapsulation, with large Ni particles, contributing to Ni sintering and coking. The correlation of the synthesis-structure-performance in this study sheds light on the design of coking-/sintering-resistant encapsulated catalysts for DRM.

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Appendix A. Supplementary data for Developing Silicalite-1 encapsulated Ni nanoparticles as sintering-/coking-resistant catalysts for dry reforming of methane Developing Silicalite-1 encapsulated Ni nanoparticles as sintering-/coki... 2022


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