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Selective Hydrocracking and Isomerization of N-Octodecane on ZSM-22Zeolite

Author: WangGuoQing
Tutor: LiuJing
School: Dalian University of Technology
Course: Industrial Catalysis
Keywords: ZSM-22zeolite hydrocracking isomerization n-octadecane catalyticactivity
CLC: O643.32
Type: Master's thesis
Year: 2013
Downloads: 40
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Abstract


Generally, long-chain aliphatic hydrocarbon exists in fatty acid of vegetable oil, and the long-chain hydrocarboncan be obtained using some technology methods, Compared with the hydrocarbon originated from petroleum, this kind of hydrocarboncan have several obvious and special advantages, such as, environmental friendly products made from this kind of hydrocarbon, and the regenerative raw materials. The purpose of this study in the paper is to produce aviation kerosene through selective hydrocracking and isomerization of n-octadecane obtained from vegetable oil using ZSM-22Zeolite as a catalyst.ZSM-22zeolite is used as a catalyst in this paper, and the catalytic activity of selective Hydrocracking and Isomerization of n-Octadecane on ZSM-22zeolite was studied to find the optimum condition for catalytic performance. Using the technology methods, the acid content, acid strength and pore structure were adjusted. And the properties of the ZSM-22zeolite catalysts were characterized by SEM、XRD、TPD、FT-IR measurements, and so on.The major aspects in this paper are in following:1) H-ZSM-22zeolite catalysts was prepared, using the ion exchange methods, and then Pt was loaded on the ZSM-22zeolite catalysts to produce Pt/ZSM-22catalysts. Subsequently, we studied the catalytic activity of the selective hydrocracking and isomerization of n-octadecane on ZSM-22zeolite.2) The influences for catalytic activity of n-octadecane on ZSM-22zeolite were studied to find the optimum condition. The reaction temperature, reaction pressure, H2/hydrocarbon mole ratio, space velocity and the yields of products were investigated. The results indicated that the optimum reaction conditions were reaction temperature of280℃, space velocity of1.0g/(h·g-cat), reaction pressure of3.0MPa, H2/hydrocarbon mole ratio of15. Using the conditions, the average conversion of n-octadecane and the average yield of products were maintained at86.5%and33.1%, respectively.3) To optimize the catalytic performance, the acid content, acid strength on surface of catalyst was adjusted to achieve a balance of the acid content and acid strength. Steam passivation, citric acid and ethyl orthosilicate were used to study the influence for the selective hydrocracking and isomerization of n-octadecane on ZSM-22zeolite. 4) According to the above optimum processing methods, the60hours stability test of the ZSM-22zeolite catalyst was also measured after preparation of a batch of catalyst.

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CLC: > Mathematical sciences and chemical > Chemistry > Physical Chemistry ( theoretical chemistry ),chemical physics > Chemical kinetics,catalysis > Catalytic > Catalytic reaction
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