Enhanced activity of Ni/SiO₂ catalyst in dry reforming of CH4 via a modified impregnation method

A modified impregnation method with the addition of NH₄NO₃ was employed to prepared the supported Ni catalyst (denoted as Ni/SiO₂-N). And the obtained catalyst exhibited an improved catalytic activity and stability in DRM at 800°C with GHSV of 48 L⋅gcat.⁻¹⋅h⁻¹ and CH₄/CO₂/N₂ = 9/9/2. The XRD and H₂-TPR results showed that the Ni/SiO₂-N catalyst was possessed with smaller Ni particles and stronger metal-support interaction than Ni/SiO₂ catalyst prepared by the common impregnation method, leading to the better catalytic performance. It is the decomposition of NH₄NO₃ which can generate extra heat in a short time during the catalyst preparation process that make the change in structure and performance of catalyst. (paper)