Nickel-induced structure transformation in hydrocalumite for enhanced ammonia decomposition. (21st April 2020)

• Record Type: Journal Article
• Authors: Zhao, Jiawen; Deng, Lidan; Zheng, Wei; Xu, Shuang; Yu, Qianqian; Qiu, Xinhong
• Is Part Of: International journal of hydrogen energy. Volume 45:Number 22(2020)
• Page Start: 12244
• Page End: 12255
• Publication Date: 2020-04-21
• Subjects: Hydrocalumite -- Ni2+ -- Layered double hydroxides (LDHs) -- Modulation of material structure -- Structure transformation -- Ammonia decomposition; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2020.02.201
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: Modifying the material structure of catalysts and determining how the structure controls their catalytic activities are critical topics in heterogeneous catalysis research. Herein we report that the structure of hydrocalumite-layered double hydroxides (CaAl-LDHs) can be tuned by gradually introducting Ni 2+ . It was revealed that the gradual introduction of Ni 2+ in hydrocalumite led to a structure-transformation process, which introduced hydrombobomkulite and eventually evolved into takovite. Compared with the case without structure-transformation process, the structure-transformation catalysts showed excellent NH3 decomposition activity after high-temperature reduction. Moreover, the obtained catalysts showed a relatively high conversion per Ni weight compared with other reported oxide-supported Ni catalysts. This study demonstrates the feasibility of preparing LDHs-based heterogeneous catalysts by modulating the material structure through induced structure-transformation process. Graphical abstract: Image 1 Highlights: Modifying the structure of hydrocalumite by introducting Ni 2+ . The substitution of Ni 2+ in hydrocalumite led to a structure-transformation process. The structure-transformation catalysts showed excellent NH3 decomposition activity.