| http://www.w3.org/ns/prov#value | - It is preferred to use ammonium or alkali salts formed with carboxylic acid anions such as acetate, formiate, propionate, ascorbinate, tartarate and/or lactate and/or inorganic acid anions such as borate, carbonate, hydrocarbonate, phosphate, phosphite, sulfate, and/or sulfite as catalyst of the process.
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