Abstract
Abstract The addition of phosphoric acid to W–Nb–O catalyst active for glycerol transformation to acrolein and to W–V–Nb–O catalyst active for direct transformation of glycerol to acrylic acid appreciably improved their catalytic performance. The phosphoric acid-added W–Nb–O catalyst gave acrolein yield of 81.8%, and the phosphoric acid-added W–V–Nb–O catalyst gave acrylic acid yield of 59.2% in the direct glycerol transformation. The improvement of the catalytic performance seems due to the increases of the acid amount and the Brønsted acidity.
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