膜反应器中生物质甘油制氢反应的热力学研究

采用吉布斯自由能最小化方法对膜反应器中生物质甘油水汽重整制氢反应进行热力学研究,考察了温度、压力、水与甘油进料比(S/G)等条件对反应性能的影响,并分析副产物CO和CH₄的生成、积炭的生成、移去CO₂、O₂的添加等对氢气产量和反应体系平衡组成的影响.结果表明:T=900 K,p=100 kPa,S/G=12时,在膜反应器中及时移除CO₂可提高氢气产量和选择性,氢气产量高达6.86 mol H₂/摩尔甘油,选择性98.00%; 在反应体系中添加少量的O₂(摩尔分数<1%)有利于抑制CO和CH₄的生成,而氢气产量几乎不受影响.

The Thermodynamic Study on the Steam Reforming of Bio-Glycerol for Hydrogen Production with Membrane Reactor

A thermodynamic analysis on hydrogen production by steam reforming of bio-glycerol in membrane reactor was carried out by employing the Gibbs free energy minimization principle.The influence of operating conditions such as temperature,pressure,ratio of steam and glycerol(S/G),the production of CO,CH₄and coke,the removal of CO₂and the addition of O₂on the reaction performance,hydrogen production and selectivity were investigated in details.When T=900 K,p=100 kPa,S/G=12,hydrogen production of 6.86 mol H₂/mol glycerol and hydrogen selectivity of 98.00% were achieved in a membrane reactor via CO₂removal,which could improve the hydrogen production and selectivity.Meanwhile,the addition of little amount of O₂(<1%)was favorable for this catalysis process,showing no effects on hydrogen production,but was inhibitive of the reformation of CO and CH₄.