Insight into the effects of different ageing protocols on Rh/Al 2O3 catalyst

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal

12 Scopus Citations
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Author(s)

  • Baohuai Zhao
  • Rui Ran
  • Yidan Cao
  • Xiaodong Wu
  • Duan Weng
  • And 2 others
  • Jun Fan
  • Xueyuan Wu

Detail(s)

Original languageEnglish
Pages (from-to)230-236
Journal / PublicationApplied Surface Science
Volume308
Publication statusPublished - 30 Jul 2014
Externally publishedYes

Abstract

In this work, a catalyst of Rh loaded on Al2O3 was prepared by impregnating method with rhodium nitrate aqueous solution as the Rh precursor. The catalyst was aged under different protocols (lean, rich, inert and cyclic) to obtain several aged samples. All the Rh/Al2O 3 samples were characterized by X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET) method, CO-chemisorption, H2-temperature programmed reduction (H2-TPR), transmission electron microscope (TEM) and X-ray photoelectron spectroscopy (XPS). It was found that a specific ageing treatment could strongly affect the catalytic activity. The N2 aged and the H2 aged samples had a better catalytic activity for CO + NO reaction than the fresh sample while the air aged and the cyclic aged samples exhibited much worse activity. More surface Rh content and better reducibility were obtained in the N2 and the H2 aged samples and the Rh particles existed with an appropriate size, which were all favorable to the catalytic reaction. However, the air and the cyclic ageing protocols induced a strong interaction between Rh species and the Al 2O3 support, which resulted in a severe sintering of particles of Rh species and the loss of active sites. The structure evolution scheme of the catalysts aged in different protocols was also established in this paper. © 2014 Elsevier B.V.

Research Area(s)

  • Ageing protocols, Diffusion, Interaction

Citation Format(s)

Insight into the effects of different ageing protocols on Rh/Al 2O3 catalyst. / Zhao, Baohuai; Ran, Rui; Cao, Yidan; Wu, Xiaodong; Weng, Duan; Fan, Jun; Wu, Xueyuan.

In: Applied Surface Science, Vol. 308, 30.07.2014, p. 230-236.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal