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Design and Manufacture of Advanced Catalysts for the Propane Dehydrogenation Process Based on Metal Oxides

Amanati, Mozhdeh | 2025

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 58071 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Kazemini, Mohammad; Soltanali, Saeed; Royaee, Javid
  7. Abstract:
  8. Given the increasing global demand for propylene and the inherent limitations of traditional production technologies, the development of efficient, economical, and sustainable catalysts for the dehydrogenation of propane has become a strategic necessity in the petrochemical industry. In this study, with the aim of enhancing the performance, stability, and selectivity of cobalt-based catalysts, two types of catalytic supports—zeolitic ZSM-5 and mesoporous silica MCM-41—were employed. Various metal species, including Sn(II), Sn(IV), Cu, Zr, Zn, Ba, and Mn, were incorporated into the support structures via doping or dealumination methods. The synthesized catalysts were comprehensively characterized using advanced techniques such as XRD, BET, NH3-TPD, H2-TPR, XPS, Raman, DRS, and TGA. Catalytic evaluation and reactor performance tests revealed that Co/Sn(II)@ZSM-5 and Co/Sn(II)@MCM-41 exhibited outstanding performance, achieving propylene selectivity values exceeding 80% and 92%, respectively. Moreover, Co/Sn(II)@ZSM-5 demonstrated a significantly reduced deactivation rate (kd = 0.053 h-1) and minimized coke deposition (0.72%). This improved performance is attributed to the uniform dispersion of Co2+ species, the formation of stable Co–O–Si bonds within the zeolitic framework, and the well-controlled surface acidity. Similarly, Co/Sn(II)@MCM-41 showed remarkable performance, with a lower deactivation rate (kd = 0.068 h-1) and substantially reduced coke formation (6.28%) compared to other modified MCM-41-based samples. These findings highlight the significant enhancement in catalyst stability and lifespan achieved by utilizing the ordered mesoporous structure of MCM-41 and the uniform distribution of active metal species on the catalyst surface. Overall, the structural modification of cobalt-based catalysts using Sn(II) over both ZSM-5 and MCM-41 supports has led to the development of highly active, selective, and long-lasting catalysts with improved resistance to coke formation. These results represent an important step toward the design of a new generation of sustainable and efficient catalysts for environmentally friendly processes in the petrochemical industry
  9. Keywords:
  10. Propane Dehydrogenation ; Zeolite Catalyst HZSM-5 ; Mobil Composition of Matter No. 41 (MCM-41) ; Propylene Selectivity ; Cobalt Active Phase ; Catalytic Stability

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