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Characterization study of NiMo/SiO2-Al2O3 spent hydroprocessing catalysts for heavy oils

Paper ID Volume ID Publish Year Pages File Format Full-Text
54392 47008 2014 8 PDF Available
Title
Characterization study of NiMo/SiO2-Al2O3 spent hydroprocessing catalysts for heavy oils
Abstract

•NiMo/SiO2-Al2O3 spent catalysts characterized by several techniques.•Decreasing of acid catalytic sites confirmed by cumene hydrocracking.•Activity of acidic catalysts affected by carbon and metal deposition.

NiMo/SiO2-Al2O3 spent catalysts were obtained after the hydroprocessing of Maya crude oil in a fixed-bed up-flow reactor. The textural properties, metal content, carbon deposition and sulfide phase of spent catalysts were studied and compared with those of fresh catalysts. Scanning electron microscopy was used to study the deposit of nickel and vanadium, and the total metal content was determined by atomic absorption. The sulfide phase was analyzed with the use of infrared spectroscopy technique. Moreover, the catalytic activity of spent catalysts was evaluated with cumene hydrocracking and compared with the catalytic activities of fresh catalysts. The characterization results show that the silica-alumina NiMo catalysts are more sensitive to metal deposition than carbon deposition because of their porous structure which provokes pore mouth plugging and the decrease of the NiMoS active sulfide phase. The results show that optimizing the catalyst resistance to deactivation requires a trade-off between the support acidity and macro-mesoporosity.

Keywords
NiMo/SiO2-Al2O3 spent catalysts; Carbon deposition; Metal deposition; CO adsorption; Cumene cracking
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Characterization study of NiMo/SiO2-Al2O3 spent hydroprocessing catalysts for heavy oils
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volumes 220–222, March 2014, Pages 89–96
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us