Ni‐Al2O3/Ni‐foam catalyst with enhanced heat transfer for hydrogenation of CO2 to methane
Ni‐Al2O3/Ni‐foam catalyst with enhanced heat transfer for hydrogenation of CO2 to methane
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DOI：
10.1002/aic.14935
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发表时间：
2015-12
期刊：
影响因子：
3.7
通讯作者：
Yakun Li;Qiaofei Zhang;Ruijuan Chai;Guofeng Zhao;Ye Liu;Yong Lu;F. Cao
中科院分区：
文献类型：
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作者：
Yakun Li;Qiaofei Zhang;Ruijuan Chai;Guofeng Zhao;Ye Liu;Yong Lu;F. Cao
通过对泡沫镍的湿法化学刻蚀改性，研制出了Ni-Al_2 O_3/Ni-泡沫整体式催化剂，该催化剂在强放热CO_2甲烷化过程中具有高活性、高选择性和稳定性。所制备的催化剂，其特征在于通过X-射线衍射扫描电子显微镜，电感耦合等离子体原子发射光谱法，和H2-程序升温还原-质谱。结果表明，采用改进的湿法化学腐蚀方法可以一步制备出NiO-Al_2 O_3复合催化剂层（约2 μm），并将其牢固地嵌入到泡沫镍基体中。对于H2/CO2（摩尔比为4/1）的进料，在320 ℃和0.1MPa下，气时空速为5000 h-1，在10.2mL这种整体式催化剂上的整个1200小时测试中，可以获得并保持90%的高CO2转化率和>99.9%的高CH 4选择性。计算流体动力学计算和实验测量一致地证实了由于增强的传热而导致的“热点”温度的急剧降低。© 2015美国化学工程师学会AIChE J，61：4323-4331，2015
Monolithic Ni-Al2O3/Ni-foam catalyst is developed by modified wet chemical etching of Ni-foam, being highly active/selective and stable in strongly exothermic CO2 methanation process. The as-prepared catalysts are characterized by x-ray diffraction scanning electron microscopy, inductively coupled plasma atomic emission spectrometry, and H2-temperature programmed reduction-mass spectrometry. The results indicate that modified wet chemical etching method is working efficiently for one-step creating and firmly embedding NiO-Al2O3 composite catalyst layer (∼2 μm) into the Ni-foam struts. High CO2 conversion of 90% and high CH4 selectivity of >99.9% can be obtained and maintained for a feed of H2/CO2 (molar ratio of 4/1) at 320°C and 0.1 MPa with a gas hourly space velocity of 5000 h−1, throughout entire 1200 h test over 10.2 mL such monolithic catalysts. Computational fluid dynamics calculation and experimental measurement consistently confirm a dramatic reduction of “hotspot” temperature due to enhanced heat transfer. © 2015 American Institute of Chemical Engineers AIChE J, 61: 4323–4331, 2015