Simplified kinetic model for steam reforming of ethanol on a Ni/Al2O3 catalyst

• Type: Article in International Scientific Journal
• Date: 2013

Authors

Y.-J. Wu (Author) Other; J. C. Santos (Author) Other; Ping Li (Author) Other; J.-G. Yu (Author) Other; A. F. Cunha (Author) FEUP; A. E. Rodrigues (Author) Other

Journal

Title: Canadian Journal of Chemical Engineering

Vol. 92

Pages: 116-130

ISSN: 0008-4034

Publisher: Wiley-Blackwell

Indexing

ISI Web of Knowledge - 15 Citations

Scopus - 0 Citations

Scientific classification

FOS: Engineering and technology > Chemical engineering

CORDIS: Technological sciences > Engineering > Chemical engineering

Other information

Authenticus ID: P-008-NET

DOI: 10.1002/cjce.21773

Abstract (EN): Ethanol steam reforming is a promising method for hydrogen production. Kinetic studies are carried out over a nickel-based catalyst from 200 to 600°C. A simplified Langmuir-Hinshelwood-Hougen-Watson (LHHW) kinetic model was proposed with nine parameters, where the surface decomposition of methane is assumed as the rate determining step (RDS), and while all other reaction steps are set as reversible. It is postulated that the velocity of the backward reaction step of the dissociative methane adsorption is similar to all other equilibrium reactions proposed, while the forward reaction step is set as the RDS. In addition, the formation of adsorbed carbon species is excluded due to the fact that SRE experiments were performed with excess water, suggesting that OH species, excluding O species formation, stick better on active Ni surface than methane. In addition, a power law kinetic model was used for analysis; the activation energy was 31.8kJ/mol, and the reaction order of ethanol pressure was 1.52. Experimental results were successfully demonstrated by both kinetic models. The purpose of this work was to develop a simplified mechanistic model to replace empirical models (power rate model) and other proposed kinetic models that are too complex for an applied kinetic process. It was found that the simplified LHHW kinetic model has a better fit than that of the power law model. The proposed kinetic model works well over a wide temperature range (200-600°C). © 2013 Canadian Society for Chemical Engineering.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 15