| http://www.w3.org/ns/prov#value | - mainly one of suppressing the decomposition of alcohols, which is useless for objective reaction, and reducing the deposition of hydrocarbons produced by reaction of organic materials ontothe surface of the catalyst and prolonging the service life of the catalyst.As raw materials of various metal oxides which are used in this invention, derivatives of each metal, such as hydroxides, carbonates, sa
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