Journal
FRONTIERS OF CHEMICAL SCIENCE AND ENGINEERING
Volume 15, Issue 5, Pages 1111-1124Publisher
SPRINGER
DOI: 10.1007/s11705-020-2031-9
Keywords
SAPO-41 molecular sieve; Pt-Pd bimetallic site; bifunctional catalysts; n-hexadecane; hydroisomerization
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Funding
- National Key R&D Program of China
- Intergovernmental International Science and Technology Innovation Cooperation Key Project [2018YFE0108800]
- National Natural Science Foundation of China [21676074, 21706053]
- National Key Research and Development Project
- National Ministry of Education Silk Road 1 + 1 Research Cooperation Project
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This study investigates the hydroisomerization of n-hexadecane over Pt-Pd bimetallic catalysts prepared by co-impregnation or sequential impregnation, and analyzes the effects of metal species and impregnation order on catalytic performance. The results show that the Pt-Pd/SAPO-41 catalyst prepared by co-impregnation exhibits the highest iso-hexadecane yield and best stability, indicating effective (de)hydrogenation activity promotion.
The hydroisomerization of n-hexadecane over Pt-Pd bimetallic catalysts is an effective way to produce clean fuel oil. This work reports a useful preparation method of bimetallic bifunctional catalysts by a co-impregnation or sequential impregnation process. Furthermore, monometallic catalysts with loading either Pt or Pd are also prepared for comparison. The effects of the metal species and impregnation order on the characteristics and catalytic performance of the catalysts are investigated. The catalytic test results indicate that the maximum iso-hexadecane yield over different catalysts increases as follows: Pt/silicoaluminophosphate SAPO-41 < Pd/SAPO-41 < Pt*-Pd/SAPO-41 (prepared by sequential impregnation) < Pt-Pd/SAPO-41 (prepared by co-impregnation). Owing to the synergic effects between Pt and Pd, the Pt-Pd/SAPO-41 catalyst prepared by the co-impregnation method demonstrates the effective promotion of (de)hydrogenation activity. Therefore, this catalyst exhibits the highest iso-hexadecane yield of 89.4% when the n-hexadecane conversion is 96.3%. Additionally, the Pt-Pd/SAPO-41 catalyst also presents the highest catalytic activity and best stability even after 150 h long-term tests.
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