Hydrogen production from aqueous‐phase reforming of glycerol, sorbitol, and glycine over Pt/Al2O3 catalyst in a fixed‐bed reactor

Aqueous‐phase reforming (APR) is an interesting technique for generating hydrogen (H2) from biofeeds. In this work, APR of model compounds of wet biomass for H2 production was investigated. Glycerol, sorbitol, and glycine were the chosen model compounds. They represent polyols and amino acids in wet...

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Bibliographic Details
Published inInternational journal of chemical kinetics Vol. 56; no. 11; pp. 674 - 686
Main Authors Kalekar, Vinayak N, Vaidya, Prakash D
Format Journal Article
LanguageEnglish
Published Hoboken Wiley Subscription Services, Inc 01.11.2024
Subjects
Aluminum oxide
Amino acids
Biomass
Calorific value
Catalysts
Electron microscopy
Electrons
Glycerol
Glycine
Hydrogen production
Microscopy
Photoelectrons
Polyols
Reaction kinetics
Reforming
Sorbitol
X ray photoelectron spectroscopy
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Summary:Aqueous‐phase reforming (APR) is an interesting technique for generating hydrogen (H2) from biofeeds. In this work, APR of model compounds of wet biomass for H2 production was investigated. Glycerol, sorbitol, and glycine were the chosen model compounds. They represent polyols and amino acids in wet biomass such as waste sludge and microalgal biomass. The Pt/Al2O3 catalyst was preferred and it was characterized using nitrogen adsorption–desorption, scanning electron microscopy (SEM), transmission electron microscopy (TEM), x‐ray diffraction (XRD), and x‐ray photoelectron spectroscopy (XPS) techniques. APR trials were performed in a continuous fixed‐bed reactor. The reaction conditions chosen for this work were: temperature (T) 453–498 K, pressure (P) 1.2–2.4 MPa, feed concentration 5–15 wt%, and weight hourly space velocity (WHSV) 0.15–0.6 g reactant/(g catalyst h). The best conditions for H2 production by the APR process were found to be T = 498 K, P = 2.4 MPa, and feed concentration = 15 wt%. Among the chosen model compounds, glycerol exhibited the highest H2 selectivity (82.7%) and H2 yield (21.6%) at 498 K. The analysis of kinetic data suggested first‐order reaction kinetics for all the model compounds. The values of activation energy for the reactions with glycerol (55.4 kJ/mol), sorbitol (51.6 kJ/mol), and glycine (45.7 kJ/mol) were determined. Thus, APR is a promising route for effectively producing H2‐bearing gaseous products with high heating value from wet biomass.
ISSN:0538-8066
1097-4601
DOI:10.1002/kin.21752