The purpose of this study is to develop a powerful CO₂ methanation process using a variety of structured Ni/CeO₂ catalysts. Various configurations of metallic honeycomb-type catalysts, which are plain, stacked, segment, and multi-stacked were constructed and tested under various reaction conditions; i.e. inlet temperature, feed flow rate and CO₂ partial pressure. Effects of the developed configurations including stack and gap distance were examined. The random-flow channels of stacked type and the gap distance of segment type could improve the catalytic activity, resulting in high CO₂ conversion. Under industrial-like high feed rate condition and pure feed gas component, a moderate hot spot over the multi-stacked catalyst was observed and reported for the first time. The moderate hot spot reboosted the conversion to a high level even at high feed flow rate condition of 3000 mL/min (contact time of 235 ms). As a result, high CO₂ conversion > 90%, high CH₄ selectivity > 99.5%, and high stability with dropped conversion < 0.6%, could be maintained over 76 h test at setting temperature of 300 °C, flow rate of 3000 mL/min and feed ratio of $p_{{CO}_2}/p_{H_2}=0.12/0.88$. The stability of the Ni/CeO₂ catalyst under the moderate hot spot condition was revealed by BET, SEM and XRD analyses.

这项研究的目的是开发使用各种结构化的Ni / CeO ₂催化剂的强大的CO ₂甲烷化过程。在各种反应条件下，构造并测试了金属蜂窝型催化剂的各种结构，包括平整，堆叠，分段和多层堆叠。即入口温度，进料流速和CO ₂分压。检查了包括堆叠和​​间隙距离在内的已开发配置的影响。堆积型的随机流动通道和链段型的间隙距离可提高催化活性，导致高CO ₂转换。在工业化的高进料速率条件下和纯净的进料气成分下，首次观察到并报道了多层催化剂上方的中等热点。即使在3000 mL / min的高进料流速条件下（接触时间235 ms），中度的热点也将转化率提高到了一个很高的水平。结果，在设定温度为300°C，流量为3000 mL的情况下，经过76小时的测试，可以保持高的CO ₂转化率> 90％，高的CH ₄选择性> 99.5％和高稳定性，并且转化率下降<0.6％。 / min和进料比$p_{{CØ}_{\mathrm{2个}}}/p_{H_{\mathrm{2个}}}=0.12/0.88$。通过BET，SEM和XRD分析揭示了Ni / CeO ₂催化剂在中等热点条件下的稳定性。