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Hydrogen Generation by Ammonia Decomposition over Co/CeO2 Catalyst: Influence of Support Morphologies
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  • Chuanqing Huang,
  • Yingzhi Yu,
  • Xiaoyue Tang,
  • Zeyu Liu,
  • Jin Zhang,
  • Chuanzhen Ye,
  • Yong Ye,
  • Rongbin Zhang
Chuanqing Huang
South China University of Technology
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Yingzhi Yu
Nanchang University
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Xiaoyue Tang
South China University of Technology
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Zeyu Liu
South China University of Technology
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Jin Zhang
South China University of Technology
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Chuanzhen Ye
South China University of Technology
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Yong Ye
South China University of Technology
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Rongbin Zhang
Nanchang University
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Abstract

Three morphology CeO2 supports with three-dimensionally ordered mesoporous structure (3DOM), nanotubes (NT) and nanocubes (NC) were synthesized by nanocasting of a mesoporous silica KIT-6 template with cubic Ia3d symmetries, hydrothermal method with and without urea, respectively, and supported cobalt catalysts were investigated on the production of COx-free hydrogen from ammonia decomposition for 300-600ºC. Morphological structure of CeO2 significantly influenced the catalytic activities in the ammonia decomposition, and the Co/CeO2-3DOM catalyst had a higher catalytic performance than Co/CeO2-NC and Co/CeO2-NT. It was elucidated by the formation of smaller particles size and more oxygen vacancies. The Co/CeO2-3DOM catalyst exhibited good stability and reusability at 600ºC for ammonia decomposition due to the three-dimensionally ordered mesoporous structure as anchoring cobalt active sites and prevention from active site aggregation. A mechanistic insight has been presented to understand the structure-activity relationship based on the structure of the CeO2 supports.