Comparative study on the performance of <i>n</i>-dodecane isomerization reaction on molecular sieve catalysts with different topological structures

LIU Jia; SONG Zhao-yang; LI Si-jie; ZHOU Ming-dong; LI Lei; LING Feng-xiang

doi:10.19906/j.cnki.JFCT.2023067

Volume 51 Issue 10

Oct. 2023

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LIU Jia, SONG Zhao-yang, LI Si-jie, ZHOU Ming-dong, LI Lei, LING Feng-xiang. Comparative study on the performance of n-dodecane isomerization reaction on molecular sieve catalysts with different topological structures[J]. Journal of Fuel Chemistry and Technology, 2023, 51(10): 1441-1452. doi: 10.19906/j.cnki.JFCT.2023067

Citation:

LIU Jia, SONG Zhao-yang, LI Si-jie, ZHOU Ming-dong, LI Lei, LING Feng-xiang. Comparative study on the performance of n-dodecane isomerization reaction on molecular sieve catalysts with different topological structures[J]. Journal of Fuel Chemistry and Technology, 2023, 51(10): 1441-1452. doi: 10.19906/j.cnki.JFCT.2023067

Citation:

LIU Jia, SONG Zhao-yang, LI Si-jie, ZHOU Ming-dong, LI Lei, LING Feng-xiang. Comparative study on the performance of n-dodecane isomerization reaction on molecular sieve catalysts with different topological structures[J]. Journal of Fuel Chemistry and Technology, 2023, 51(10): 1441-1452. doi: 10.19906/j.cnki.JFCT.2023067

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Comparative study on the performance of n-dodecane isomerization reaction on molecular sieve catalysts with different topological structures

doi: 10.19906/j.cnki.JFCT.2023067

1.
LiaoNing Petrochemical University, Fushun 113001, China
2.
SINOPEC (Dalian) Research Institute of Petroleum and Petrochemicals Co., Ltd, Dalian 116045, China

Funds: The project was supported by China Petrochemical Corporation Limited (420014).

Received Date: 2023-08-17
Accepted Date: 2023-09-13
Rev Recd Date: 2023-09-13

Available Online: 2023-09-18

Publish Date: 2023-10-10

Abstract

Abstract

The catalysts were prepared by loading about 0.5% Pt noble metal on Y molecular sieves, ZSM-5 molecular sieves and β molecular sieves with similar Si/Al ratios. The crystal structures of the molecular sieves with different topologies, elemental compositions, pore structures, activities, and Al distributions were investigated by means of XRD, XRF, TEM, N₂ physical adsorption and desorption, NH₃-TPD, Py-FTIR, and ²⁷Al NMR. And then the effect of topology on the catalytic performance of n-dodecane isomerization reaction was investigated. The results showed that when the Si/Al ratios were close to each other, the ZSM-5 molecular sieve had the highest total acid and skeleton Al ratio and the smallest average pore size, the Y molecular sieve had the lowest total acid and skeleton Al ratio and the largest average pore size, and the β molecular sieve's total acid, skeleton Al ratio, and average pore size were between the two others, which indicated that different topologies of the molecular sieves with different combinations of Si/Al atoms affected not only the structure of the pores and the size of the pore but also the number of acidity. In the n-dodecane isomerization reaction, the Pt/ZSM-5 catalyst had the highest activity and the main reaction occurred on the outer surface without selectivity, the Pt/Y catalyst had the lowest activity and the isomerization reaction mainly occurred inside the pores, while the Pt/β catalyst had the activity between the other two catalysts and the isomerization reaction occurred dominantly at the pore opening as the key-locking reaction.
- similar Si/Al ratio,
- β-molecular sieve,
- Y-molecular sieve,
- ZSM-5 molecular sieve,
- topological,
- isomerization

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References(37)

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