不同因素对神木煤电化学氧化制氢特性的影响

Effect of Different Factors on Electrochemical Hydrogen Production From Shenmu Coal

为了探究碱性条件下神木煤电化学氧化制氢特性,实验以铂电极为工作电极,采用恒电流法,通过单因素实验和正交实验考察了反应温度、煤浆浓度、K3Fe(CN)6浓度、碱液浓度及搅拌速度对煤浆电化学氧化制氢的影响。结果表明1 mol/L KOH、温度30℃、搅拌速率520 r/min、煤浆浓度0.06 g/mL、催化剂浓度0.03mol/L时为最优工艺条件,在该条件下氧化电压最小且产生气体较多。采用气相色谱分析了气体组成,H2含量可达95%以上,还含有少量CO2和CH4气体。同时神木煤电化学氧化前后的FT-IR和XRD表明,神木在电化学氧化中収生了相关氧化反应。

In order to investigate the electrochemical hydrogen production characteristics of Shenmu coal in alkaline solution,taking platinum electrode as working electrode and using constant current electrolysis,the influences of reaction temperature,coal slurry concentration,K3 Fe(CN)6 concentration,alkaline concentration and stirring rate on the electrochemical oxidation hydrogen production of coal slurry were investigated by orthogonal experiments and single-factor experiments.The results revealed that the optimum conditions were as follows:KOH concentration 1 mol/L,the temperature 60°C,the stirring rate 520 r/min,the coal slurry concentration 0.06 g/mL and the catalyst concentration 0.08 mol/L.Under above conditions,the electrochemical oxidation voltage was the lowest and more gas was produced.The composition of produced gas was analyzed by gas chromatography,and hydrogen content reached 95%.FT-IR and XRD measurements of Shenmu coal before and after electrolysis oxidation reaction indicated that Shenmu coal oxidizing reaction happened in the electrochemical oxidation.