Sorption-enhanced glycerol steam reforming over hierarchical hollow Ni-CaO-Ca12Al14O33 bi-functional catalyst derived from hydrotalcite-like compounds
Sorption-enhanced glycerol steam reforming over hierarchical hollow Ni-CaO-Ca12Al14O33 bi-functional catalyst derived from hydrotalcite-like compounds
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DOI：
10.1016/j.fuel.2022.124468
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发表时间：
2022-09
期刊：
影响因子：
7.4
通讯作者：
Chengxiong Dang;Zhiyuan Li;Juan Long;Wenwen Yang;Weiquan Cai
中科院分区：
文献类型：
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作者：
Chengxiong Dang;Zhiyuan Li;Juan Long;Wenwen Yang;Weiquan Cai
利用吸附增强型蒸汽重整（SESR）技术就地捕获二氧化碳制氢是减少人为二氧化碳排放的一个很有前途的概念。然而，在高反应速率和脱碳温度下，烧结引起的快速循环性能衰减限制了其实际应用。在这里，我们设计了一种具有表面空间限制策略的高度稳定的双功能催化剂。该双功能催化剂具有分层中空微球结构，其壳层由层状金属氧化物组成。发现Ca和Ni的抗烧结性是由于表面空间限制效应，即Ni和CaO颗粒的聚集和迁移被层抑制。经过20次seseg -脱碳后，SESRG反应稳定性高，吸附增强效果仅损失35%，h2纯度保持在99%。研究结果为设计稳定的双功能催化剂提供了参考。
Hydrogen production with in situ CO2capture by the sorption-enhanced steam reforming (SESR) technology is a promising concept to reduce anthropogenic CO2emissions. However, its practical applicability is limited by rapid, sintering-induced cyclic performance decay at high reaction rate and decarbonation temperatures. Here, we design a highly stable bi-functional catalyst with a surface spatial confinement strategy. The bi-functional catalyst has a hierarchical hollow microsphere structure, in which the shell is composed of layered metal oxides. The sintering resistance of Ca and Ni species is found to arise from the surface spatial confinement effect in which the aggregation and migration of Ni and CaO particles are suppressed by the layers. High stability for SESRG reaction with only 35% loss of sorption enhancement effect is observed after 20 cycles of repeated SESEG-decarbonation, during which H2purity is maintained at 99%. The result shed light on the design of the stable bi-functional catalysts in the SESR reaction.