Abstract
Isomerate, the product of a light naphtha Isomerization unit, is a clean, high-octane gasoline blending component, which is free of sulfur content, aromatics, and olefins. However, the isomerization of the long-chain alkanes, such as n-heptane, is pretty difficult. As a result, this process has not been commercialized yet. In recent years, much attention has been paid to Pt/WO3/ZrO2 as an n-heptane isomerization catalyst due to its good thermal stability, strong acidity, simplicity of preparation, reusability and good isomerization activity. In this work, the Pt/WO3/ZrO2 catalyst was modified by various loading of metal Cr to improve the catalytic performance. The effects of WO3 content, Cr metal loading and calcination temperature on the catalyst characters and catalytic activity were studied. It is shown that Cr-Pt/WO3/ZrO2 with the loading of 18 wt% WO3 and 1.0–1.4 wt% Cr, prepared at the calcination temperature of 800 °C, has the highest activity. It was found that the octane number increases by 28 units through the isomerization of light naphtha feedstocks. In addition, the study on the stability of Cr-Pt/WO3/ZrO2 indicates that the catalyst is not deactivated after 500 h of the n-heptane isomerization reaction.
Highlights
Current stringent environmental protection regulations have forced the implementation of severe controls for reducing aromatic, olefin, and sulfuric compounds and led to a sharp rise in the demand for clean fuels with none-aromatic and high octane number [1,2]
No process that is suitable for heptane fraction isomerization in industrial oil refining is currently known; since the implementation of such a process will allow for the meeting of long-term environmental requirements for commercial gasoline, it has aroused increased interest [4]
Pt/WO3/ZrO2 enhances catalysis and stability of n-heptane isomerization, and it was demonstrated n-heptane isomerization, and it was demonstrated that Cr can be used as a modifier in Pt/WO3 /ZrO2 that Cr can be used as a modifier in Pt/WO3/ZrO2 catalysts
Summary
Current stringent environmental protection regulations have forced the implementation of severe controls for reducing aromatic, olefin, and sulfuric compounds and led to a sharp rise in the demand for clean fuels with none-aromatic and high octane number [1,2]. Heptane isomerization to branched isomers with high octane numbers is a desirable reaction for compensating for the octane number [3,4]. /ZrO catalyst shows high selectivity in the isomerization reaction of linear alkane,. 2 type catalyst shows high selectivity in the isomerization reaction of linear alkane, the 2 type catalyst activity is is is too high [8].[8]. Many researchers have found that the addition of researchers have found that the addition of small amounts of metals such as Fe, Al, In, and Ga to small amounts of metals such as Fe, Al, In, and Ga to Pt/WO3 /ZrO2 enhances catalysis and stability of. Pt/WO3/ZrO2 enhances catalysis and stability of n-heptane isomerization, and it was demonstrated n-heptane isomerization, and it was demonstrated that Cr can be used as a modifier in Pt/WO3 /ZrO2 that Cr can be used as a modifier in Pt/WO3/ZrO2 catalysts.
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