The electrocatalytic hydrogenation of glucose; 1: Kinetics of hydrogen evolution and glucose hydrogenation on Raney nickel powder

Journal Article · Sat Oct 01 04:00:00 EDT 1994 · Journal of the Electrochemical Society; (United States)

DOI:https://doi.org/10.1149/1.2059196· OSTI ID:6941105

Anantharaman, V; Pintauro, P N ^[1]

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1. Tulane Univ., New Orleans, LA (United States). Dept. of Chemical Engineering

The kinetics of H[sub 2] evolution and glucose reduction to sorbitol was investigated using a batch slurry reactor containing Raney nickel powder catalyst. In the presence and absence of glucose, hydrogen evolution proceeds via a Volmer-Heyrovsky mechanism, with both steps simultaneously rate controlling at low overpotentials and the Volmer reaction rate limiting at high cathodic overvoltages. A kinetic model for the electrocatalytic hydrogenation of glucose with simultaneous H[sub 2] generation was developed and tested. The model contains rate equations for the individual Volmer, Heyrovsky, and glucose hydrogenation steps, a Langmuir adsorption isotherm for glucose, an equation describing the shift in open-circuit potential due to glucose adsorption on the nickel catalyst, and steady-state atomic hydrogen and charge balance relationships. The theory accurately predicted potentiostatic polarization data and glucose hydrogenation rates. The results indicate that the mechanism for sorbitol formation with electrogenerated atomic hydrogen on Raney nickel is the same as that for the high temperature and pressure chemical catalytic hydrogenation process.

• OSTI ID: 6941105
• Journal Information: Journal of the Electrochemical Society; (United States), Journal Name: Journal of the Electrochemical Society; (United States) Vol. 141:10; ISSN JESOAN; ISSN 0013-4651
• Country of Publication: United States
• Language: English

Related Subjects

08 HYDROGEN
080101* -- Hydrogen-- Production-- Electrolysis
09 BIOMASS FUELS
090900 -- Biomass Fuels-- Processing-- (1990-)
ALDEHYDES
CARBOHYDRATES
CATALYTIC EFFECTS
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
DIURETICS
DRUGS
ELECTROLYSIS
ELEMENTS
EQUATIONS
GLUCOSE
HEXOSES
HYDROGEN PRODUCTION
HYDROGENATION
KINETIC EQUATIONS
KINETICS
LYSIS
MATHEMATICAL MODELS
METALS
MONOSACCHARIDES
NICKEL
ORGANIC COMPOUNDS
REACTION KINETICS
SACCHARIDES
SORBITOL
SYNTHESIS
TRANSITION ELEMENTS