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Effect of water vapor on the catalytic oxidation of nitric oxide
Author(s) -
Kircher Omer,
Hougen O. A.
Publication year - 1957
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.690030310
Subject(s) - water vapor , catalysis , chemistry , adsorption , relative humidity , activated carbon , inorganic chemistry , kinetics , humidity , oxide , capillary condensation , reaction rate , chemical engineering , organic chemistry , thermodynamics , physics , quantum mechanics , engineering
Extension of the kinetics of the catalytic oxidation of nitric oxide on activated carbon and silica gel confirms the rate‐controlling step postulated by previous workers. The effect of variables including water vapor on the reaction rate is expressed by an equation containing the constants a , b , c , and w , which have been evaluated for both catalysts at 30°, 45°, and 60°C. The effect of water vapor is to reduce the reaction by reversible adsorption on the active sites of the catalyst. The value of w is dependent on temperature but independent of water‐vapor concentration up to a relative humidity of 20%. Above 20% the value of w for activated carbon increases greatly with relative humidity, in agreement with the effect of capillary adsorption at high water contents.