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- Title
Pre-reforming of n-tetradecane over Ni/MgO-AlO catalyst: effect of added potassium on the coke resistance.
- Authors
Lee, Sung-hun; Koo, Kee; Jung, Un; Shul, Yong-Gun; Yoon, Wang
- Abstract
We investigated the pre-reforming of n-tetradecane (CH) over the K-promoted 50 wt% Ni/MgO-AlO catalyst and also analysed the coke resistance. The 50 wt% Ni/MgO-AlO catalysts were prepared by the deposition-precipitation method and 1-5 wt% of potassium was added to the catalyst using the impregnation method. The catalysts were characterized by ICP, XRD, H-chemisorption, H-TPR, and BET. The pre-reforming of n-tetradecane was performed under the reaction conditions of S/C = 4.0, GHSV = 3000 h, and 400-450 °C. The Ni crystallite size increased, whereas the Ni dispersion and surface area of catalysts decreased with increasing amounts of K. The 50 wt% Ni/MgO-AlO showed large amounts of coke deposition compared to the K-promoted catalysts. It was found that the K addition over 50 wt% Ni/MgO-AlO catalyst was beneficial for coke removal by promoting the coke gasification. A 1 wt%K/50 wt% Ni/MgO-AlO catalyst showed stable activity during pre-reforming at S/C = 4.0, GHSV = 3000 h, and 400 °C. Furthermore, it had the lowest amount of surface coke, as observed by SEM, TEM, and TG analysis.
- Subjects
METALLIC oxides; METAL catalysts; SURFACE area; DEPOSITIONS; PRECIPITATION (Chemistry); POTASSIUM
- Publication
Research on Chemical Intermediates, 2016, Vol 42, Issue 5, p4317
- ISSN
0922-6168
- Publication type
Article
- DOI
10.1007/s11164-015-2277-x