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以海泡石为载体制备生物质气化的碱金属催化剂,开展了低温水蒸气条件下的麦秸半焦催化气化试验。采用响应面设计法,进行3-level中心组合设计试验,构建半焦气化性能指标(氢气产率RH2、碳转化率XC、反应速率YC)与催化剂制备参数(K2CO3负载量、催化剂煅烧温度)的响应曲面,对半焦气化性能进行效应分析和优化。研究结果表明:K2CO3负载量对半焦气化反应的影响极显著;催化剂煅烧温度对氢气产率、碳转化率影响显著;二者对氢气产率、碳转化率还存在一定的交互效应。利用Design Expert软件优化,得到最佳的催化剂制备参数为:煅烧温度728℃、K2CO3负载量25.8%,在此优化条件下的试验结果显示RH2?103.67 mol/kg、XC?96.48%、YC?1.28%/min,与模型预测值一致。气化温度对半焦气化有着重要的影响,低于700℃时,气化反应受到抑制,且试验表明海泡石是生物质低温气化制取富氢气体的一种合适的催化剂载体。
Methane gasification catalyst was prepared by using sepiolite as carrier, and catalytic gasification of wheat straw under low temperature steam was carried out. The response surface design method was used to test the 3-level central composite design, and the gasification performance index (hydrogen yield RH2, carbon conversion rate XC, reaction rate YC) and catalyst preparation parameters (K2CO3 loading and catalyst calcination temperature) Response surface of the semi-coke gasification performance analysis and optimization. The results show that the influence of K2CO3 loading on the gasification reaction of semi-coke is very significant. The influence of catalyst calcination temperature on hydrogen yield and carbon conversion rate is remarkable. The interaction between hydrogen production rate and carbon conversion rate is still significant. The optimal catalyst preparation parameters were optimized by Design Expert software: calcination temperature 728 ℃, K2CO3 loading 25.8%, under the optimal conditions, the results showed that RH2? 103.67 mol / kg, XC? 96.48%, YC? 1.28 % / min, consistent with the model predictions. The gasification temperature has an important influence on the gasification of semi-coke. When the gasification temperature is below 700 ℃, the gasification reaction is inhibited, and the test shows that the sepiolite is a suitable catalyst carrier for gas-phase hydrogenation of biomass to produce hydrogen-rich gas.