Abstract
Porous silica encapsulated attapulgite (ATP) clay supported nickel catalysts were prepared by successive precipitation-deposition method, which were tested in an ammonia decomposition for production of COx-free hydrogen. The textural and structure properties of Ni/ATP catalysts and silica encapsulated Ni/ATP catalysts were characterized by X-ray diffraction, scanning and transmission electron microscopy, N2 sorption, thermogravimetry-differential thermal analysis, hydrogen temperature-programmed reduction. The results reveal that ATP supported Ni catalysts possess a suitable specific surface area and pore volume, as well as nano-structure. Ni nanoparticles are mostly located on the external surface of ATP supports. With an increase on Ni loading content from 10 to 50 wt % (theoretical value), the ammonia conversion increases gradually. Owning to porous silica enwrapping, the Ni-30/ATP@SiO2 catalysts show a higher specific activity (17.0 mol gNi−1 h−1, 650 °C) and stability than Ni-30/ATP catalysts.
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