Thermodynamic analysis of methane reforming with CO2, CO2 + H2O, CO2 + O-2 and CO2 + air for hydrogen and synthesis gas production

Author(s)

Freitas, Antonio C. D. ^[1] ; Guirardello, Reginaldo ^[1]

Affiliation

^[1] Univ Estadual Campinas, UNICAMP, Sch Chem Engn, BR-13083852 Campinas, SP - Brazil

• Document type: Journal article
• Source: JOURNAL OF CO2 UTILIZATION; v. 7, p. 30-38, SEP 2014.
• Web of Science Citations: 19

Abstract

The main objective of this work is performing a thermodynamic evaluation of methane reforming with CO2, CO2 + H2O, CO2 + O-2 and CO2 + air. These evaluations were carried out by Gibbs energy minimization, in conditions of constant pressure and temperature, and entropy maximization, at constant pressure and enthalpy, methods, to determine the equilibrium compositions and equilibrium temperatures, respectively. Both cases were treated as optimization problems (using non-linear programming formulation), satisfying the restrictions imposed by atom balance and non-negativity of number of moles. The GAMS (R) 23.1 software and the CONOPT solver were used in the resolution of the proposed problems. All calculations performed presented a low computational time (less than 1 s). The calculated results were compared with previously published experimental and simulated data with a good agreement between them for all systems. The H-2 and syngas production were favored at high temperature and low pressure conditions. The addition of H2O or O-2 proved to be an effective way to reduce the coke formation in the systems. The CO2 reforming presented endothermic behavior, but the addition of O-2 or air reduced this trend and in some conditions autothermal behavior was observed. (C) 2014 Elsevier Ltd. All rights reserved. (AU)

• FAPESP's process: 11/20666-8 - THERMODYNAMIC ANALYSIS OF THE TRANSFORMATION OF BIOMASS IN FUELS USING GLOBAL OPTIMIZATION TECHNIQUES
• Grantee: Antonio Carlos Daltro de Freitas
• Support Opportunities: Scholarships in Brazil - Doctorate