1. Promoter effect of heteroatom substituted AlPO-11 molecular sieves in hydrocarbons cracking reaction.
- Author
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Lyu, Yuchao, Liu, Xinmei, Liu, Zhen, Yan, Zifeng, Liu, Yuxiang, Rood, Mark J., Wang, Baojie, and Wang, Yi
- Subjects
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CRACKING process (Petroleum industry) , *ANTIKNOCK gasoline , *HYDROFINING , *CARBENIUM ions , *DEHYDROGENATION , *ACID rain , *DESULFURIZATION - Abstract
It is important to develop new promoters of fluid catalytic cracking (FCC) catalyst to increase iso-paraffin yield and avoid the decrease of research octane number (RON) caused by olefin saturation in gasoline hydrofining. SAPO-11 and LaAPO-11 molecular sieves were used as promoters to FCC catalyst to increase gasoline RON and were tested in the cracking reaction of n-dodecane on FCC conditions. LaAPO-11 molecular sieve has less and weaker acidity than SAPO-11 molecular sieve. LaAPO-11’s metallic sites polarize the C H bonds to form carbenium ions for isomerization reaction and weak acid sites make less contributions to the cracking of iso-paraffin. LaAPO-11 promoter increases the yield of iso-paraffin (C 5-9 ) from 6.4% to 10.2%. Besides that, a high yield of arene (2.0%) is caused by the dehydrogenation activity of LaAPO-11 promoter. The new contributions of this paper are the synthesis of a hydrothermal stable LaAPO-11 molecular sieve with isomerization activity and proposing the reaction routes of iso-paraffin. These new contributions are important for developing more effective RON promoters of FCC catalyst. [ABSTRACT FROM AUTHOR]
- Published
- 2018
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