Meadwestvaco Corporation

Westvaco Corporation

David R B Walker

Tiejun Zhang

Peter D A McCrae

Laurence H Hiltzik

Edward D Tolles

Peter D A Mccrae

A method for avoidance of attrited carbon dust is disclosed to lead to improved canister performance in emission control. Product attrition by dusting of granular and shaped activated carbons is disclosed to be reduced significantly, or essentially eliminated, by the application of a thin, continuous polymer coating on the granular or shaped activated carbon, without a reduction in adsorption velocity or capacity of the activated carbon when used in automotive emission control canisters.

Coated activated carbon for automotive emission control

A new shaped activated carbon and the method of its manufacture are disclosed. The invention resides in the crosslinking of a polymeric cellulose, such as sodium carboxymethylcellulose (CMC), within the carbon bodies after they are shaped, employing the CMC as a binder for the activated carbon. The approach to attain product mechanical strength and water stability by crosslinking rather than high temperature heat treatment is not obvious from the prior art teaching. The crosslinking reaction occurs at temperatures below 270&deg; C. In addition, this new binder technology produces shaped carbon bodies having key properties beyond the best level that has been accomplished with other binders.

Method of making shaped activated carbon

Shaped activated carbon

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Charleston, SC, United States of America

David R B Walker