鼓泡流化床中甲烷催化裂解制氢的实验研究

Experimental Study on Catalytic Decomposition of Methane for Hydrogen Production in a Bubbling-Bed Reactor

采用15Ni3Cu2Al(原子比)复合氧化物催化剂,用氮气稀释的甲烷为原料,在流化床中对甲烷催化裂解制氢进行了研究。初始甲烷浓度范围为20%～50%,反应温度控制在500～680℃,临界流化高度为10～30mm。600℃时反应气体流量控制在250～360ml/min之间,流化床稳定操作可以在一定的反应时段内实现。当初始甲烷浓度为48%,反应温度600℃,产物氢气浓度达42%,且可以稳定维持在30min以上,能实现氢气的稳定生产。热力学计算表明试验值与平衡值还有一段距离,因此优化操作还可进一步进行。

Catalytic decomposition of methane for hydrogen production was investigated in a bubbling fluidized-bed reactor (inner diameter, 10mm ) over a 15Ni3Cu2Al(atomic ratio)composite oxide catalyst with diluted methane in nitrogen. Over the entire range of reaction conditions, i.e. 20%-50% initial methane, T=500-680℃, Hmf=10-30mm,and gas flow of 250-360 ml/min, stable reactor operation for hydrogen production was achieved. In some cases, hydrogen content in products could reach 42% and so stable hydrogen production can be reached. It was found from thermodynamic calculation that hydrogen content in products is much lower than that calculated. Therefore, it needs to optimize the operation once more.