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Coke deposition mechanism on the pores of a commercial Pt-Re/γ- Al2O3 naphtha reforming catalyst

Baghalha, M ; Sharif University of Technology | 2010

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  1. Type of Document: Article
  2. DOI: 10.1016/j.fuproc.2010.02.002
  3. Publisher: 2010
  4. Abstract:
  5. Coke deposition mechanism on a commercial Pt-Re/γ-Al 2O3 naphtha reforming catalyst was studied. A used catalyst that was in industrial reforming operation for 28 months, as well as the fresh catalyst of the unit were characterized using XRD, XRF, and nitrogen adsorption/desorption analyses. Carbon and sulfur contents of the fresh and the used catalysts were determined using Leco combustion analyzer. The pore size distributions (PSD) of the fresh and the used reforming catalysts were determined using BJH and Comparison Plot methods. The Comparison Plot method produced the most reasonable PSDs for the catalysts. Through comparison of the PSDs of the fresh and the used catalysts, it was revealed that coke deposited on both micropores and mesopores of the catalyst at a constant thickness of 1.0 nm. The constant coke thickness on the catalyst pore walls in the naphtha reforming process (temp. ∼ 500 °C) implies that coke deposition reaction is the slow controlling step in comparison to the fast mass transfer rate of coke ingredients into the pores. The bulk density of the deposited coke on the used catalyst was calculated as 0.966 g/cm3
  6. Keywords:
  7. Alumina ; BJH ; Catalyst ; Comparison plot method ; Nitrogen adsorption/desorption ; Pore size distribution ; Adsorption/desorption ; Coke deposition ; Naphtha reforming ; Octane number ; Octane numbers ; Coke ; Combustion ; Naphthas ; Nitrogen ; Platinum ; Polyacrylonitriles ; Pore size ; Size determination ; Size distribution ; Sulfur ; Catalysts
  8. Source: Fuel Processing Technology ; Volume 91, Issue 7 , 2010 , Pages 714-722 ; 03783820 (ISSN)
  9. URL: http://www.sciencedirect.com/science/article/pii/S0378382010000354?np=y&npKey=b817b9b7504cbdfbdbf1347ba02932fb7d95bbfc167fa14a6a68f20c9f97f454