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Study on Synthesis and Catalytic Performance of Zeolite ZSM-22

Author: WangYaTao
Tutor: XuJun
School: Zhengzhou University
Course: Chemical processes
Keywords: ZSM-22 zeolite Synthesis Characterization Dodecane Pt/ZSM-22 catalyst Isomerization
CLC: O643.36
Type: Master's thesis
Year: 2011
Downloads: 114
Quote: 0
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Abstract


Isomerization technology can be applied to improve the octane number of gasoline and lower long-chain alkanes base oil pour point is the production of high octane gasoline and high- quality lubricants more economical approach. Dewaxing catalyst is mainly used for the metal - bifunctional zeolite catalysts , with 10-ring channels and moderate acidic zeolite isomerization has better catalytic performance. ZSM-22 zeolite with 10-ring opening of a 1D channel , Kong Daoping line in the ( 001 ) direction , orifice size is 4.5 × 5.5A. In this paper, hydrothermal synthesis method examines the ratio of raw materials , the crystallization temperature and reaction time on the synthesis of ZSM-22 . X-ray diffraction , infrared spectroscopy, low temperature nitrogen adsorption-desorption , scanning electron microscopy, and NH3-TPD characterization methods such as determination of the structure of ZSM-22 zeolite crystal morphology, surface area, acidity. The acid- modified zeolite ZSM-22 through the dual function of Pt catalyst was prepared and used for the n-dodecane hydroisomerization reaction . The experimental results show that: 1 Dynamic synthesis and static seeded synthesis method can synthesize high purity crystalline zeolite ZSM-22 well , crystallization time compared to the previous dynamic synthesis method is superior to static seeded France . (2) addition of seed crystals of the static method, using a silicon source do orthosilicate , high crystallinity can be synthesized ZSM-22 zeolite , by exploration of the reaction conditions , optimal conditions for the synthesis of 90 (Si02): 1 (A1203 ): 27 (DHA): 27 (K): 3600 (H20), crystallization temperature of 160 ℃, crystallization time 48h, seed dosage 1000ppm-3000ppm to synthesize highly crystalline molecular sieves. 3 using XRD, SEM, IR, N2 adsorption and NH3-TPD and other methods to characterize the synthesis of ZSM-22 zeolite crystal structure , crystal grain appearance, surface area and acidity. 4 investigated in Pt/ZSM-22 catalyst reaction temperature, pressure , space velocity , hydrogen to hydrocarbon ratio on the n-dodecane catalytic isomerization reaction. Experimentally derived optimal reaction conditions were: reaction temperature 305 ℃, reaction pressure of 2MPa, space velocity of 1, H2 / hydrocarbon molar ratio of 15 . In optimal conditions dodecahedron alkane conversion rate 89.09% , 34.29% isomerization reaction selectivity , single- branched selectivity of 29.71% , 65.71% selectivity to cracking .

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