Abstract
Combustion of hydrogen releases energy but in many applications, catalytic combustion of hydrogen may prove advantageous over direct combustion. The main advantage of catalytic combustion of hydrogen is that heat can be obtained at lower temperatures as well. The activity of catalyst for combustion of lean mixtures (< 2%) of hydrogen was studied in the present work and the kinetics of catalytic combustion of hydrogen has been established. The combustion of hydrogen on alumina supported platinum catalyst starts at above 323 K. Two reaction models have been investigated for possible mechanism of the reaction. The kinetics follows Hougan-Watson model where both hydrogen and oxygen adsorb on same site; hydrogen undergoes dissociative chemisorption and surface reaction being the slowest step. However, a simplified power law type rate equation was also established which adequately fits the experimental data for temperature between 373 and 673 K.
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