Hydrogen production via sorption enhanced chemical looping reforming of glycerol using Ni-based oxygen carrier and Ca-based sorbent: Theoretical and experimental study

摘要

The sorption enhanced chemical looping reforming of glycerol (SECLRG) was proposed. This process can produce high purity H_2 without need for additional gas separation equipment Thermodynamic analysis on the reformer of SECLRG was conducted based on the minimization of Gibbs free energy. The results show that the favorable operation conditions for reformer are pressures around 1-20 atm, temperatures around 800 K, oxygen excess number of 1, and sorbent excess number of 1. The thermal efficiency with steam addition is higher than that without steam addition. The SECLRG was also examined in a fixed bed reactor, with NiO/Al_2O_3 and CaO particles as bed material and glycerol as fuel. Experimental results showed that the H_2 molar fraction was higher with CaO than without it. Initially, high purity hydrogen (>95%) was obtained by SECLR of glycerol at 800 K and 1 atm.