Effect of Calcination Temperature on the Characterization of Spent Catalyst

Disposal of spent catalyst is a growing concern for all refiners. Environmental regulations are becoming increasingly stricter and there are state recommendations to develop disposal routes that emphasize recycling as much as possible and processing the wastes as near as possible. In this context, a...

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Bibliographic Details
Published in:Petroleum science and technology 2010-01, Vol.28 (3), p.322-330
Main Authors: Mohamed, L. K., Shaban, S. A., El-Kady, F. Y.
Format: Article
Language:English
Subjects:
Applied sciences
Calcination
Catalysts
Compressive strength
Crude oil
Crude oil, natural gas and petroleum products
Energy
Exact sciences and technology
Fuels
Nickel
Petroleum products, gas and fuels. Motor fuels, lubricants and asphalts
Processing of crude oil and oils from shales and tar sands. Processes. Equipment. Refinery and treatment units
Recycling
Regeneration
Spinel
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Summary:Disposal of spent catalyst is a growing concern for all refiners. Environmental regulations are becoming increasingly stricter and there are state recommendations to develop disposal routes that emphasize recycling as much as possible and processing the wastes as near as possible. In this context, a recycling process has been carried out for the Ni-Mo/Al 2 O 3 spent catalyst used in oil refineries. The process starts with a deoiling of the catalyst to eliminate oil and then calcination at different temperatures to remove carbon-contaminated. Fresh and spent catalyst samples were analyzed by a variety of techniques, which include X-ray diffraction (XRD), infrared spectroscopy (IR), crushing strength, bulk crushing strength, surface area, and pore volume. The activities of fresh and spent catalysts have been studied using micropulse techniques and cyclohexene as a model molecule. It has been noticed that, after the regeneration step, there was some nickel promoter loss due to nickel spinel (NiAl 2 O 4 ) formation. The spinel formation explains why the catalytic activity of the fresh catalyst was not fully recovered after the regeneration of the spent catalyst.
ISSN:1091-6466
1532-2459
DOI:10.1080/10916460903058103