Soot oxidation performance with a HZSM-5 supported Ag nanoparticles catalyst and the characterization of Ag species

Hongcheng Ruan, Maiko Nishibori, Tomoki Uchiyama, Kakeru Ninomiya, Kazutaka Kamitani, Kazuo Kato, Yuko Konishi, Alexander Haensch, Nicolae Barsan, Udo Weimar, Kengo Shimanoe

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Abstract

A HZSM-5 supported Ag nanoparticles catalyst, which has a Si/Al ratio of 1500, is synthesized by a simple impregnation method for soot oxidation. Ultrafine Ag nanoparticles (NPs) of 1-2 nm in diameter were well dispersed and stable without any aggregation up to 800 °C, confirmed by high resolution scanning transmission electron microscopy, X-ray photoelectron spectroscopy, and high temperature X-ray diffraction. This catalyst exhibited high intrinsic soot oxidation activity and Tmax (peak temperature of DTA curves) values were 362 °C and 533 °C under tight contact and loose contact conditions, respectively. Furthermore, the physical and chemical states of Ag species before and during soot oxidation were examined by in situ X-ray absorption spectroscopy. Two kinds of Ag species (ZO-Ag+ and Ag NPs) were found in this catalyst; they were reduced and crystallized after heating over 150 °C. The Ag NPs remained stable without any aggregation even after 800 °C, which means the Ag/HZSM-5 catalyst can be well regenerated after high temperature treatment, ensuring good repeatability of soot oxidation performance.

Original languageEnglish
Pages (from-to)43789-43797
Number of pages9
JournalRSC Advances
Volume7
Issue number69
DOIs
Publication statusPublished - Jan 1 2017

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)

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    Ruan, H., Nishibori, M., Uchiyama, T., Ninomiya, K., Kamitani, K., Kato, K., Konishi, Y., Haensch, A., Barsan, N., Weimar, U., & Shimanoe, K. (2017). Soot oxidation performance with a HZSM-5 supported Ag nanoparticles catalyst and the characterization of Ag species. RSC Advances, 7(69), 43789-43797. https://doi.org/10.1039/c7ra06712g