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Abstract RHA-Al2O3 binary oxide supported nickel catalyst
prepared by deposition-percipitation examined in methanantion
of CO2 from H2/CO2(4/1)mixtrue gas and high selectivity
(80~95%)for CH4formation was found in proceeding the reaction at
673~873K withs supported nickel. During the investigations of
preparation conditions, effects of nickel loading, AL2O3
content in support, deposition-precipitation time, calcination
time, calcination temperature, reaction time and reaction
temperature on catalytic behavior were persented and discussed ,
The results indicate that the metal dispersion increases with
decreasing of nickel loading , The higher the nickel loading,
the larger the crystallite size becomes,The CH4 selectivity
depends on AL2O3 content in supports and calcination conditions;
the CH4 yield acheieves a maximum value in CO2gydrogenation at
773K. It is examined by temperature-programmed reduction
techniques that catalyst prepared by this method shows the
effect of metal-support interactions.Moreover, in comparison
with nickel catalysts supported on RHA-Al2O3 and SiO2-Al2O3 by
H2-TPD techniques and reaction test, RHA-AL2O3 is apreferable
support in methanation of carbon dioxide.
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