Porous Ni-Ca-Al-O bi-functional catalyst derived from layered double hydroxide intercalated with citrate anion for sorption-enhanced steam reforming of glycerol
Porous Ni-Ca-Al-O bi-functional catalyst derived from layered double hydroxide intercalated with citrate anion for sorption-enhanced steam reforming of glycerol
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DOI：
10.1016/j.apcatb.2021.120547
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发表时间：
2021-12
影响因子：
22.1
通讯作者：
Chengxiong Dang;Yang Wenwen;Jingxun Zhou;C. Weiquan
中科院分区：
文献类型：
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作者：
Chengxiong Dang;Yang Wenwen;Jingxun Zhou;C. Weiquan
吸附增强型水蒸气重整(SESR)技术可能为缓解气候变化提供中期(如果不是短期的)解决方案。SESR工艺经济运行的一个关键要求是获得高效的双功能催化剂。在此，我们提出了一种柠檬酸盐层状双氢氧化物(LDH)的碳模板法来制备具有高孔结构的Ni-CaO-Ca12Al14O33双功能催化剂。由于柠檬酸阴离子插层提供的物理隔离效应，多孔结构抑制了Ni和Ca物种的烧结。制备的柠檬酸盐-10Ni-CA2.8在甘油SESR反应脱碳35次循环中表现出非常稳定的性能，在此过程中，H_2纯度保持在98%以上，吸附促进作用仅损失30%，大大优于没有柠檬酸插层的10Ni-CA2.8的70%。此外，柠檬酸阴离子插层策略也可能指导从LDH衍生的材料用于其他高温反应。
The sorption-enhanced steam reforming (SESR) technology may offer a mid-term if not near-term solution to mitigate climate change. A key requirement for the economic operation of SESR processes is the availability of highly effective bi-functional catalysts. Herein, we propose a citrate intercalated layered double hydroxide (LDH) strategy within situformation of carbon template to prepare the Ni-CaO-Ca12Al14O33bi-functional catalyst featuring highly porous morphologies. The porous structure has inhibited the sintering of Ni and Ca species thanks to the physical isolation effect provided by citrate anion intercalation. The as-prepared Citrate-10Ni-CA2.8 displays a very stable performance for 35 reaction-decarbonation cycles in SESR of glycerol, during which H2purity is retained over 98 % and only 30 % loss in sorption enhancement effect is observed, largely outperforming 10Ni-CA2.8 without citrate intercalation by 70 %. Moreover, the citrate anion intercalation strategy may also guide in designing materials derived from LDH for other high-temperature reactions.