Effect of various admixtures on the properties of Mn-substituted cordierite


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Abstract

The effect of various admixtures (graphite, sawdust, mullite–silica fiber, vermiculite, boric acid, different size fractions of cordierite, corundum microspheres) in the cordierite stock (mixture of talc, clay, manganese oxide, and aluminum hydroxide) on the formation of Mn-substituted cordierite has been investigated. The admixtures exert an effect on the degree of cordierite formation, on the impurity phase content of the product (including its Mn2O3 content), on the surface concentration of manganese cations, on their oxidation state, on the texture of the catalysts, and on their ammonia oxidation activity. The highest NOx yield is observed with the catalysts containing a coarse fraction of cordierite and corundum microspheres, which are characterized by a high surface concentration of oxidized manganese cations and have large transport pores.

About the authors

E. F. Sutormina

Boreskov Institute of Catalysis, Siberian Branch

Author for correspondence.
Email: selena@catalysis.ru
Russian Federation, Novosibirsk, 630090

L. A. Isupova

Boreskov Institute of Catalysis, Siberian Branch

Email: selena@catalysis.ru
Russian Federation, Novosibirsk, 630090

N. A. Kulikovskaya

Boreskov Institute of Catalysis, Siberian Branch

Email: selena@catalysis.ru
Russian Federation, Novosibirsk, 630090

N. A. Rudina

Boreskov Institute of Catalysis, Siberian Branch

Email: selena@catalysis.ru
Russian Federation, Novosibirsk, 630090

V. A. Rogov

Boreskov Institute of Catalysis, Siberian Branch; Novosibirsk State University

Email: selena@catalysis.ru
Russian Federation, Novosibirsk, 630090; Novosibirsk, 630090

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