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Construction And Evaluation of Nickel Catalysts Based on Silica Structures to Apply in the Hydrogenation Process of Benzene

Shafiei Dezaki, Mohammad Reza | 2022

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 57078 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Khorashe, Farhad; Soltanali, Saeed; Mashaiekhi, Maryam
  7. Abstract:
  8. Benzene is one of the most famous aromatic compounds characterized by ringing and stability, which is formed by both natural processes and human activities. Benzene is also a substance found in hydrocarbons such as gasoline and hexane. International organizations for cancer research and global health have identified benzene as a carcinogen. Also, polymer grade hexane and in fact the same benzene-free hexane is widely used in the petrochemical and lubrication industries (food industry) of the country, which also requires reducing benzene from 6 to 2% to less than 50% ppm. Since partial and selective hydrogenation of benzene is performed because it is a heterogeneous process, ie at the surface of the catalyst solid particles, in addition to being precise in controlling the operating conditions, it is also a costly process, so one of the most cost-effective methods required It is a widely used chemical, so the important concern is to find a suitable catalyst for benzene saturation, and considering that the active metal used in the present study is nickel metal with a suitable percentage between 15-30% and also the hexane hydrocarbon cut, the construction and achievement of The optimum catalytic base of the process is of particular importance. With these interpretations, the purpose of this dissertation is to construct and investigate the role of various types of siliceous bases on the catalytic performance of the benzene saturation process. After synthesizing some samples of amorphous and crystalline siliceous bases, we metalized them in two ways. In the first method, we deposited the entire amount of nickel metal on the base by inoculation method, and in the second method, we introduced a percentage of it into the base structure during synthesis and the rest. We added to the base by wet inoculation and by analysis of Raman spectrometry, H2-TPR, EDX Dot-Mapping, BET FESEM, FTIR XRD, we examined each of the bases and the effect of adding metal. Finally, by reactor test and comparing the obtained results with The results of commercial catalyst We concluded that crystalline silica bases have a favorable effect on the process and the addition of metal during synthesis provides more surface dispersion, which results in an increase in conversion percentage to 19%. It was also observed that the stability of the modified catalyst was much higher Which will lead to great economic benefits
  9. Keywords:
  10. Hexanes ; Silica Support ; Crystalline Structure ; Mesoporous Silica ; Mesoporous Structure ; Benzene Hydrogenation ; Hexane Hydrocarbon Cutting

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