Facile Regeneration Strategy for Facet-Controlled Nanocatalysts via the Dissolution-Reprecipitation Process Promoted by an Organic Modifier
Facile Regeneration Strategy for Facet-Controlled Nanocatalysts via the Dissolution-Reprecipitation Process Promoted by an Organic Modifier
复制标题
通过有机改性剂促进的溶解-再沉淀过程实现面控制纳米催化剂的简便再生策略
DOI：
10.1021/acs.chemmater.1c02145
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发表时间：
2021
影响因子：
8.6
通讯作者：
Adschiri Tadafumi
中科院分区：
文献类型：
--
作者：
Tomai Takaaki;Tang Liangyu;Yoko Akira;Omura Yuki;Seong Gimyeong;Adschiri Tadafumi
高活性的面控纳米催化剂在其使用过程中容易通过表面原子迁移而劣化。本研究开发了一种方法再生降解面控纳米粒子催化剂的表面晶体结构的重新取向，通过溶解-再沉淀过程中使用的有机改性剂。超临界水热处理与羧酸改性剂改变CeO 2纳米粒子的形貌随时间的推移，以暴露的（100）面。这种形态转变动力学表明，改性剂不仅稳定（100）面，而且还加速溶解-再沉淀过程，促进面改性和催化剂再生。通过CeO 2纳米颗粒储氧能力的恢复实验验证了面控纳米催化剂的再生，这是催化活性的指标。
Highly active facet-controlled nanocatalysts deteriorate readily via surface-atom migration during their use. This study develops a method for regenerating a degraded facet-controlled nanoparticle catalyst by reorientation of surface crystalline structure via the dissolution–reprecipitation process using an organic modifier. The supercritical hydrothermal treatment with the carboxylic acid modifier changes the CeO2nanoparticles morphology to cubic-like over time to expose the (100) facet. This morphological transformation dynamics suggests that the modifier not only stabilizes the (100) facet but also accelerates the dissolution–reprecipitation process, promoting facet modification and catalyst regeneration. The facet-controlled nanocatalyst regeneration is verified experimentally by the recovery of oxygen storage capacity in the CeO2nanoparticle, which is an indicator of the catalytic activity.