Journal
FUEL PROCESSING TECHNOLOGY
Volume 122, Issue -, Pages 120-128Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.fuproc.2014.01.031
Keywords
Hydroisomerization; Hydrocracking; n-Dodecane; Nickel phosphide; SAPO-11; Acidity
Funding
- National Natural Science Foundation of China [21176177]
- Natural Science Foundation of Tianjin [12JCYBJC13200]
- Program of Introducing Talents to the University Disciplines [B06006]
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A new type of nickel phosphide catalysts supported on SAPO-11 was used for the hydroisomerization of n-dodecane. Their properties were characterized by means of N-2-sorption, H-2-TPR, XRD, XPS, DRIFTS of adsorbed pyridine, CO chemisorption, and NH3-TPD and H-2-TPD. The effects of the Ni/P ratio and the nickel content on catalyst performance were investigated. For comparison, the property and performance of Ni/SAPO-11 were also considered. Compared to Ni/SAPO-11, SAPO-11 supported nickel phosphides had higher isomerization selectivity due to their lower hydrogenolysis activity. As the Ni/P ratio deceased, the n-dodecane conversion decreased, while the isododecane selectivity reached its maximum at the Ni/P ratio of 1. As the nickel content increased, the n-dodecane conversion and isododecane selectivity reached their maximum. In short, a balance between medium strength add sites and Ni sites was required for obtaining high n-dodecane conversion and isododecane selectivity. Moreover, there was a synergism between the Ni sites and the medium strength acid site. Under suitable conditions, the isododecane yield reached about 65% on Ni2P/SAPO-11 containing 3 wt% Ni. (C) 2014 Elsevier B.V. All rights reserved.
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