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Iranian Journal of Chemistry and Chemical Engineering، جلد ۴۰، شماره ۶، صفحات ۱۷۶۵-۱۷۷۶
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عنوان انگلیسی Characterization of Fresh and Regenerated Industrial Hydrocracking Catalysts; Study Causes of Deactivation
چکیده انگلیسی مقاله In this investigation, fresh and regenerated Ni-W-Alumina-Zeolite industrial hydrocracking catalysts are characterized via several analyzing methods, including XRF, XRD, BET adsorption, FT-IR, FESEM-EDS, and TGA-DTA to understand the phenomena affecting trend towards their deactivation. The XRD patterns represented the presence of main phases of Al2O3/Y-zeolite as support and NiWO4/WO3 as active compounds. For the catalysts subjected to a three-year reactor operation/regeneration cycle, the XRF analysis revealed elemental enhancement of Fe, Na, V, Pb, Sb, and S, mostly from an outsourced environment. The BET and BJH analyses represented cylindrical shape mesoporosity for the samples, while the total pore-specific surface area and volume were reduced from 287.73 m2/g  and 0.46 cm3/g to 160.84 m2/g and 0.40 cm3/g for fresh and regenerated samples, respectively. The latter results indicated possibly filling the pores with impurities and/or sintering of pores. By considering FESEM images, the smooth surface of the fresh sample and indented/corroded characteristics of the regenerated one were seen. The variety of analyses portrayed the increasing trend of the poisoning factors and the structural malfunction of the catalysts towards irreversible deactivation.
کلیدواژه‌های انگلیسی مقاله Ni-W catalyst,Deactivation,Poisoning,Sintering
نویسندگان مقاله Salman Hajian Ghayemi |
Chemical Engineering Department, Faculty of Engineering, University of Sistan and Baluchestan, PO Box 98164-161 Zahedan, I.R. IRAN

Abdolreza Samimi |
Chemical Engineering Department, Faculty of Engineering, University of Sistan and Baluchestan, PO Box 98164-161 Zahedan, I.R. IRAN

Masoud Nematollahi |
Process Engineer and Project Supervisor, Reserch and Development Department, Abadan Oil Refining Company, PO Box 6316953111 Abadan, I.R. IRAN

نشانی اینترنتی https://ijcce.ac.ir/article_241298_864bd6e27e9c12f55006e9e02ce9af1c.pdf
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