Green hydrogen production from sorption-enhanced steam reforming of biogas over a Pd/Ni–CaO-mayenite multifunctional catalyst
Green hydrogen production from sorption-enhanced steam reforming of biogas over a Pd/Ni–CaO-mayenite multifunctional catalyst
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DOI：
10.1016/j.renene.2022.10.106
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发表时间：
2022-12
期刊：
影响因子：
8.7
通讯作者：
Chengxiong Dang;Huanhuan Xia;Shuting Yuan;Xingchuan Wei;Weiquan Cai
中科院分区：
文献类型：
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作者：
Chengxiong Dang;Huanhuan Xia;Shuting Yuan;Xingchuan Wei;Weiquan Cai
利用沼气生产“绿色氢”的碳中和应用似乎是确保能源生产可持续性的一个有吸引力的解决方案。然而，沼气中CO2含量高且变化大，限制了沼气利用的发展。在此，我们报告，吸附增强的沼气蒸汽重整（SESRB）提供了一种有效的方法，以获得高纯度的氢气从沼气与原位去除CO2。研究了温度和CO2含量对CH 4转化率和H2纯度的影响。结果表明，CO2含量对SESRB流程穿透前阶段的CH 4转化率和H2纯度没有影响。长期稳定性研究结果表明，Pd/Ni-CaO-mayenite-2. 8多功能催化剂在30次SESRB焙烧循环中，甲烷转化率可达97. 8%，氢气体积分数可达98. 0%.在SESRB反应过程中形成的少量焦炭（0.8wt%）可以通过煅烧处理过程中的碳气化有效地消除。结果表明，SESRB是一种有效利用沼气制取高纯氢气的技术。
The carbon-neutral application of biogas to produce “green hydrogen” appears to be an attractive solution to ensure the sustainability of energy production. However, the high and variable CO2content in biogas has limited the development of biogas utilization. Herein, we report that sorption-enhanced steam reforming of biogas (SESRB) provides an efficient way to obtain high-purity hydrogen from biogas with the in-situ removal of CO2. The effect of temperature and CO2content on CH4conversion and H2purity is studied. The results indicate that the content of CO2does not affect the CH4conversion and H2purity in the pre-breakthrough stage of SESRB process. Meanwhile, the performance of long-term stability shows that 98.0 vol% H2with ⁓97.8% conversion of CH4in the pre-breakthrough stage is stably obtained over the Pd/Ni–CaO-mayenite-2.8 multifunctional catalyst for 30 SESRB-calcination cycles. The small amount of coke (0.8 wt%) formed during the SESRB reaction can be effectively eliminated by carbon gasification during calcination treatment. The results point out that SESRB is a promising technology for the efficient utilization of biogas to produce high-purity hydrogen.