| http://www.w3.org/ns/prov#value | - After divalent cation-exchange, the composite is generally washed, dried and activated, preferably by heating it with a dry gas, such as air or nitrogen, at a temperature in the range of about 200 to about 800??? C., and preferably at a temperature in the range of about 300 to about 700??? C. The nitrogen-oxide- and low molecular weight hydrocarbon-selective zeolites can be used in various industr
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