Hydrogen Production via Steam Reforming of Methane with Simultaneous CO2 Capture over CaO−Ca12Al14O33
Hydrogen Production via Steam Reforming of Methane with Simultaneous CO2 Capture over CaO−Ca12Al14O33
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DOI：
10.1021/ef9014058
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发表时间：
2010-03
期刊：
影响因子：
5.3
通讯作者：
Christina S. Martavaltzi;Eleftheria P. Pampaka;Emmanuela S. Korkakaki;A. Lemonidou
中科院分区：
文献类型：
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作者：
Christina S. Martavaltzi;Eleftheria P. Pampaka;Emmanuela S. Korkakaki;A. Lemonidou
在实验室固定床反应器上比较了两种水蒸气重整制氢工艺：镍基催化剂的常规水蒸气重整和镍基催化剂与CaO−Ca12Al14O33的混合吸附剂水蒸气强化水蒸气重整。对常压下吸附强化重整的操作窗口进行了初步的热力学研究。操作温度需要低于650C才能充分利用原位捕获二氧化碳的有利热力学，而当蒸汽与甲烷的摩尔比约为3时，两种工艺方案之间的甲烷转化增益最大。在此条件下，以醋酸钙为前驱体合成的CaO−Ca12Al14O33(85：15wt)起到了有效的二氧化碳脱附剂的作用，将传统水蒸气重整过程中排放的总二氧化碳减少了67%。由于二氧化碳的捕获，甲烷水蒸气重整平衡向更高的氢纯度移动。哈.。
Two processes to produce hydrogen via steam reforming are compared in a laboratory fixed bed reactor: conventional steam reforming with a nickel-based catalyst and sorbent-enhanced steam reforming with a mixture of a nickel-based catalyst and CaO−Ca12Al14O33 sorbent. A preliminary thermodynamic study was performed to determine the operating window of the sorption enhanced reforming at atmospheric pressure. Operating temperatures less than 650 °C are required to take advantage of the favorable thermodynamics due to the in situ capture of CO2, while maximum gain in methane conversion between the two process options is attained for a steam to methane molar ratio of around 3. Under these conditions, CaO−Ca12Al14O33 (85:15 wt) synthesized using calcium acetate as a CaO precursor acted as an effective CO2 sorbent, reducing by 67% the amount of total CO2 that would have been emitted in conventional steam reforming. Due to CO2 capture, the methane steam reforming equilibrium shifted to higher hydrogen purities. H...