Structure and catalytic properties of Ni/MWCNTs and Ni/AC catalysts for hydrogen production via ammonia

Articles

Structure and catalytic properties of Ni/MWCNTs and Ni/AC catalysts for hydrogen production via ammonia [APPEEC 2014]
Author(s)
Yahia Alhamed
ABSTRACT
The catalytic properties and the structure of nickel catalysts supported on multi-wall carbon nanotubes (MWCNTs) and on three different types of activated carbon (AC) were investigated. It was found that the size of the particle size is strongly dependent on the surface area of AC carrier. Large surface area of AC led to small Ni nanoparticles and high Ni dispersion and vice versa. Turnover frequency (TOFNH3) of ammonia decomposition decreased with decreasing of Ni particle size. Ni catalyst supported on AC having the largest surface area showed the highest activity in ammonia decomposition amongst Ni/AC catalysts. Ni supported on MWCNTs showed much higher activity than that observed for the best Ni/AC catalysts studied. The synergic nickel-support interaction and special electronic conductivity properties of MWCNTs were responsible for high catalytic activity of Ni/MWCNTs catalyst.
KEYWORDS
Ni/MWCNTs, Ni/AC, hydrogen production, ammonia
References