Patent ID: 7425521

Claim:
A method for making a carbon-based monolith structure impregnated with copper, silver, zinc, and molybdenum species and triethylenediamine, wherein the monolith structure is impregnated by: contacting the monolith structure with a first solution; adjusting the pH of the first solution to about 2 to 5; treating thermally the monolith structure within a temperature range of from about 280 degrees C. to about 400 degrees C.; contacting the monolith structure with a second solution; adjusting the pH of the second solution to about 8 to 11; treating thermally the monolith structure within a temperature range of from about 100 degrees C. to about 400 degrees C.; reducing the monolith structure in hydrogen within a temperature range of from about 250 degrees C. to about 500 degrees C.; and exposing the monolith structure to triethylenediamine vapor within a temperature range of from about 80 degrees C. to about 200 degrees C.