prov:value
| - Besides the mixed-metal-oxide promoters of the present invention, the catalysts of this invention may also contain additional promoters, non-limiting examples of which can include compounds of rare earths such as lanthanum, samarium, and gadolinium, alkaline earths such as barium, strontium and calcium and other metals such as nickel, iron, and manganese, in the form of the halides, nitrates, and
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