A novel hybrid iron-calcium catalyst/absorbent for enhanced hydrogen production via catalytic tar reforming with in-situ CO2 capture
A novel hybrid iron-calcium catalyst/absorbent for enhanced hydrogen production via catalytic tar reforming with in-situ CO2 capture
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DOI：
10.1016/j.ijhydene.2020.01.243
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发表时间：
2020-04
影响因子：
7.2
通讯作者：
Han Long;Han Long;Qi Liu;Y. Zhang;Kang Lin;Guoqiang Xu;Qinhui Wang;Nai Rong;Xiaorui Liang-Xiaorui-L
中科院分区：
文献类型：
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作者：
Han Long;Han Long;Qi Liu;Y. Zhang;Kang Lin;Guoqiang Xu;Qinhui Wang;Nai Rong;Xiaorui Liang-Xiaorui-L
采用两步溶胶-凝胶法制备了一种铁钙混合催化剂/吸附剂（Ca-Al-Fe），以提高钙环气化过程中焦油转化、循环co2捕获和吸附剂的机械强度。所研制的催化剂/吸附剂由氧化钙和褐铁矿（Ca2Fe2O5）组成，并以镁铝石（Ca12Al14O33）为惰性载体。与不含ca2fe2o5或Ca12Al14O33的三种候选吸附剂相比，Ca-Al-Fe的循环碳化反应活性和机械强度都得到了很大的提高。同时，在本研究的重整条件下，Ca-Al-Fe的转化率接近1-甲基萘（1-MN）的最大转化率，产氢率提高到0.15 mol/（h·g）左右。Ca-Al-Fe也表现出最大的co2吸收和最低的焦炭沉积。评价了操作变量对1-MN重整的影响，推荐条件为铁与CaO的质量比为10%，反应温度为800℃，蒸汽与碳的1-MN摩尔比为2.0。Ca-Al-Fe杂化催化剂/吸附剂具有良好的应用前景。
An iron-calcium hybrid catalyst/absorbent (Ca–Al–Fe) is developed by a two-step sol-gel method to enhance tar conversion, cyclic CO2capture and mechanical strength of absorbent for hydrogen production in calcium looping gasification. The developed catalyst/absorbent consists of CaO and brownmillerite (Ca2Fe2O5) with mayenite (Ca12Al14O33) as inert support. Comparing with three candidate absorbents without Ca2Fe2O5or Ca12Al14O33, cyclic carbonation reactivity and mechanical strength of Ca–Al–Fe are largely promoted. Meanwhile, Ca–Al–Fe approaches the maximum conversion rate of 1-methyl naphthalene (1-MN) with enhanced hydrogen yield around 0.15 mol/(h·g) under reforming conditions of present study. Ca–Al–Fe also shows the largest CO2absorption and lowest coke deposition. Influences of operation variables on 1-MN reforming are evaluated and recommended conditions can be iron to CaO mass ratio of 10%, reaction temperature of 800 °C and steam to carbon in 1-MN mole ratio of 2.0. Ca–Al–Fe hybrid catalyst/absorbent presents good potential to be applied in future.