Preparation And Structural Characterisation
Of SBA-15 Supported Nickel Catalysts Via
Sol-gel Nickel Oxide Coatings For Dry Reforming
Of Methane
Author(s)
R. A. Ahmed, Y. X. Pang, M. Olea & S. N. B. Hodgson
Abstract
Supported nickel catalysts have been prepared by coating mesoporous silica with
nickel oxide through a sol-gel coating technology, other than the conventional
impregnation procedure. Sol-gel nickel oxide coatings were first synthesized
using nickel nitrate and lactic acid as precursors and then, deposited on the
support of mesoporous silica SBA-15. Various synthetic parameters, such as the
nickel/lactic acid molar ratio for the synthesis of the sol-gel coatings and the
nickel/SBA-15 ratio for the preparation of the catalysts, were investigated.
Scanning electron microscopy and energy-dispersive X-ray analysis, X-ray
diffraction, thermal analysis and attenuated total reflection fourier transform
infrared spectroscopy were used to characterise the nickel oxide sol-gel coatings
and the resulting supported catalysts. The catalytic activity was tested using the
Catlab integrated system. Results showed that this sol-gel coating route produces
uniform nickel oxide thin films and leads to a good distribution of the nickel
oxide on the mesopore surface of SBA-15. Compared with the catalyst prepared
by impregnation with nickel nitrate salt solutions, the catalysts prepared through
the sol-gel coating route are superb in nickel loading and distribution. The
mesostructure of the supported catalysts remain unchanged after calcinations at
elevated temperatures. Moreover, their catalytic activity towards the dry
reforming of methane reaction is higher at temperatures lower than 700°C.
Keywords: supported NiO catalysts, SBA-15 silica, sol-gel nickel oxide coatings.
Keywords
supported NiO catalysts, SBA-15 silica, sol-gel nickel oxide coatings.
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