Magnesium-promoted Ni/USY catalysts prepared via surfactant-assisted melt infiltration for ammonia decomposition

The dispersion of active metal species on the support material of a catalyst is crucial for efficient catalytic re-actions. Surfactant-assisted melt infiltration (SAMI), in which catalytically active components are supported only by heating with a surfactant instead of a solvent, is a straightforwar...

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Bibliographic Details
Published in:Applied Surface Science
Main Authors: Cho, Eui Hyun, Jeon, Namgi, Yoon, Byung Sun, Kim, Sujin, Yun, Yongju, Ko, Chang Hyun
Format: Article in Journal/Newspaper
Language:English
Published: Elsevier BV 2023
Subjects:
NI CATALYSTS
HYDROGEN STORAGE
REDUCTION
ZEOLITE
COKE
NH3
MGO
Surfactant
Melt infiltration
Dispersion
Nickel
Alkaline-earth metal
Ammonia
sami
Online Access:https://oasis.postech.ac.kr/handle/2014.oak/114852
https://doi.org/10.1016/j.apsusc.2022.155244
Description
Summary:The dispersion of active metal species on the support material of a catalyst is crucial for efficient catalytic re-actions. Surfactant-assisted melt infiltration (SAMI), in which catalytically active components are supported only by heating with a surfactant instead of a solvent, is a straightforward method for synthesizing highly dispersed catalysts. In this study, monometallic 10 wt% Ni catalyst and alkaline-earth-metal (Mg, Ca, Sr, and Ba)-doped Ni catalysts supported on the ultra-stable Y (USY) zeolite are prepared using SAMI for ammonia decomposition. The addition of SpanTM60 during the preparation of the Ni/USY catalyst improved its catalytic performance. Moreover, the Mg-promoted Ni/USY catalyst prepared via SAMI exhibited further enhancement in catalytic activity and stability, demonstrating the synergistic effect of the SpanTM60 surfactant and Mg promoter. Detailed characterization revealed that the improved performance of the surfactant-added Mg-promoted catalyst was due to the high dispersion of Ni and MgO particles and the enhanced acidic and basic properties, which affected the number of adsorption sites of NH3 and the kinetic rate-determining step during NH3 decomposition, respectively. The results showed that SAMI could be used to synthesize highly dispersed and active Ni catalysts on zeolites. 1 1 N scie scopus

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