Facile synthesis of a sintering-resistant zeolite confined Ni catalyst for efficient COx-free hydrogen generation from ammonia decomposition

Wan，Zhijian1; Tao，Youkun1,2; You，Hengzhi1; Shao，Jing3

2021-06-21

10.1039/d1se00417d

Sustainable Energy and Fuels   影响因子和分区

2398-4902

The thermal stability of a catalyst is equally important as its activity particularly for high-temperature catalysis reactions. This paper reports a facile method to synthesise highly stable ZSM-5 zeolite confined Ni catalysts (Ni@ZSM-5) for ammonia decomposition, a promising catalysis reaction for CO-free hydrogen production. The Ni@ZSM-5 catalysts were prepared by treating stabilised Ni complexes together with a dense gel of the zeolitic precursor in a one-step process. The Ni particles were thenin situencapsulated concurrently within the growing zeolite crystalline structure under hydrothermal synthesis conditions. The formation of the ZSM-5 crystalline structure was confirmed by XRD analysis. HRTEM and HAADF-STEM coupled with EDS revealed that Ni particles of ∼2 nm in diameter were homogeneously embedded in the ZSM-5 crystals. The performance of the catalysts was evaluated in ammonia decomposition at a high-temperature of 650 °C using a fixed-bed reactor. The Ni embedded catalyst (Ni@ZSM-5) exhibited not only high activity but also high stability without Ni sintering during a 100 h reaction time. For comparison, the ammonia conversion for the supported Ni catalyst (Ni/ZSM-5) preparedviathe conventional impregnation method subjected to severe sintering showed a 20% decrease in ammonia conversion under the same reaction conditions.

SCI ; EI

英语

通讯

WOS:000653214700001

20212510521115

Ammonia ; Catalysis ; Catalysts ; Chemical reactors ; Hydrogen production ; Hydrothermal synthesis ; Sintering ; Thermodynamic stability ; Zeolites

Gas Fuels:522 ; Thermodynamics:641.1 ; Chemical Plants and Equipment:802.1 ; Chemical Reactions:802.2 ; Chemical Agents and Basic Industrial Chemicals:803 ; Chemical Products Generally:804 ; Inorganic Compounds:804.2

2-s2.0-85108014312

Scopus

1.School of Science,Harbin Institute of Technology,Shenzhen,518055,China
2.Department of Mechanical and Energy Engineering,Academy for Advanced Interdisciplinary Studies,Southern University of Science and Technology,Shenzhen,518055,China
3.College of Chemistry and Environmental Engineering,Shenzhen University,Shenzhen,518060,China

Wan，Zhijian,Tao，Youkun,You，Hengzhi,et al. Facile synthesis of a sintering-resistant zeolite confined Ni catalyst for efficient COx-free hydrogen generation from ammonia decomposition[J]. Sustainable Energy and Fuels,2021,5(12):3182-3190.

Wan，Zhijian,Tao，Youkun,You，Hengzhi,&Shao，Jing.(2021).Facile synthesis of a sintering-resistant zeolite confined Ni catalyst for efficient COx-free hydrogen generation from ammonia decomposition.Sustainable Energy and Fuels,5(12),3182-3190.

Wan，Zhijian,et al."Facile synthesis of a sintering-resistant zeolite confined Ni catalyst for efficient COx-free hydrogen generation from ammonia decomposition".Sustainable Energy and Fuels 5.12(2021):3182-3190.