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Effect of P-H2O2 Treatment on Catalytic Performance of ZSM-5 Zeolite for Hydration of Cyclohexene

Author: WangMingMing
Tutor: ZhaoRuSong；YaoZhiLong
School: Beijing University of Chemical Technology
Course: Chemical Engineering and Technology
Keywords: Cyclohexene Hydrated Cyclohexanol HZSM-5 zeolite Phosphorus modified Steam treatment H2O2 treatment
CLC: TQ233.1
Type: Master's thesis
Year: 2011
Downloads: 28
Quote: 0
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Abstract


Cyclohexanol are intermediates in the production of adipic acid and caprolactam, is also an important industrial solvent. The traditional method of production of the cyclohexanol is cyclohexane oxidation method, but the method is explosion hazard exists. Asahi Kasei has developed a more economical and safer hydration process. The key to this process is that the selection of the catalyst. Compared with the other catalyst, HZSM-5 zeolite shows better hydration activity, there is still a low conversion rate of cyclohexene, the reaction rate is slow and other shortcomings. HZSM-5 zeolite was modified to make it more suitable for the hydration reaction is an important research direction. The paper first examines the HZSM-5 zeolite Al ratio and grain size of the hydration reaction of cyclohexene get SiO2/Al2O3 molar ratio of 25 and smaller grain HZSM-5 zeolite is the preferred hydrated catalyst. Secondly, the physical and chemical properties of the phosphorus and water vapor Joint modified HZSM-5 zeolite surface acidity and catalytic cyclohexene hydration of cyclohexanol performance. XRD characterization of modified catalyst does not generate new crystal phase. NH3-TPD showed that the introduction of phosphorus combined steam treatment to change the molecular sieve surface acid strength, reducing the number of acid sites, in particular, to reduce the number of strong acid sites. Pyridine adsorption infrared results show that reducing the number of strong acid sites B acid. In addition, the reduction of the number of strong acid sites, and promote the cyclohexene conversion at the same time also improve the selectivity of cyclohexanol. Derived cyclohexene hydration reaction activity and a catalyst amount of acid in particular, is a strong acid amount and acid strength are closely related. The optimum conditions of the catalyst modifier: phosphorus load mass fraction of 0.8%, the hydrothermal treatment temperature of 570 ° C, hydrothermal treatment time was 2h. Under the best conditions, the the cyclohexene conversion rate and selectivity of up to 8.31% and 97.73% cyclohexanol. Finally, the H202 HZSM-5 zeolite processing, and X-ray diffraction N2 cryoadsorption, scanning electron microscopy, were characterized by NH3-TPD and pyridine adsorption - desorption infrared spectroscopy and other methods. H202 treatment of HZSM-5 structure and catalytic cyclohexene hydration reaction activity. The treated zeolite particles becomes small, the particle size of 0.5 to 0.7 μm, while the amount of acid is decreased, B acid and L reduction in the number of acid centers, it is important to reduce more apparent L acid. H202 reactive processing help improve catalytic cyclohexene hydration of cyclohexyl alcohol, and the conversion rate of cyclohexene and cyclohexanol selectivity of up to 8.33% and 97.80% respectively.

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CLC: > Industrial Technology > Chemical Industry > Basic Organic Chemistry Industry > The production of carbon - ring compounds,alicyclic compounds > Alicyclic alcohols and their derivatives > Saturated alicyclic family alcohol
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