Journal
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
Volume 58, Issue 16, Pages 6278-6287Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.iecr.8b06465
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Funding
- European Union (European SocialFund, ESF)
- Greek national funds through the Operational Program Education and Lifelong Learning of the National Strategic ReferenceFramework (NSRF)-Research Funding Program: THALES-Investing in Knowledge Society through the European Social Fund [MIS 380405]
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Phenol hydrodeoxygenation over a commercial NiMo/gamma-Al2O3 catalyst in a reduced and sulfided form was investigated. Crushed particles (0.165-0.315 mm) were employed to determine the intrinsic reaction kinetics in either case. The internal diffusion phenomena within the catalytic particle of commercial dimensions and forms were also studied, and the phenol effective diffusion coefficient and effectiveness factor for both forms of the catalyst were determined. The sulfided form was active to phenol conversion at higher temperatures in comparison to the reduced form. As indicated from the data acquired by phenol, cyclohexanol, and benzene hydrotreatment experiments, phenol hydrodeoxygenation over the reduced and sulfided NiMo/gamma-Al2O3, catalyst follows both parallel pathways: the direct deoxygenation (DDO) and the stepwise hydrogenation (HYD). The stepwise hydrogenation (HYD) pathway is favored under the tested conditions. In the presence of the reduced catalyst, cyclohexanol and cyclohexane are the main products and the selectivity toward cyclohexanol is high at low temperatures. In the presence of the sulfided catalyst, cyclohexane was the main hydrotreatment product together with a small amount of benzene.
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