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Nitric Oxide Adsorption by Clay Minerals¹

ABSTRACT

Nitric oxide was found to be chemically adsorbed on mont-morillonite and nontronite when the exchange complex was saturated with certain transition metal ions. Infrared data showed a number of reactions depending on the nature of the saturating ion including: (i) coordination of NO as the mono or dinitrosyl complex; (ii) formation of N₂O; (iii) formation of (NO)⁺. The NO molecule was able to penetrate the interlamellar regions of Co-montmorillonite or Co-nontronite. On all other systems, apparently only surface adsorption occurred. When air was admitted, all surface-adsorbed NO was immediately oxidized, but interlamellar NO decreased at a rate apparently dependent upon the diffusion of NO to the clay mineral surface. A produce of oxidation was found to be coordinated nitrite.

¹ Authorized for publication by the Director as Journal Article no. 3531 of the Michigan Agr. Exp. Sta., East Lansing. This work was supported by National Science Foundation Project GP1478.

² Professor of Soil Science.

Received for publication December 21, 1964. Accepted for publication February 11, 1965.