Formic Acid Production via One-Pot Hydrolysis-Oxidation of Starch over Quaternary Ammonium Salts of Vanadium-Containing Keggin-Type Heteropoly Acids
oleh: Nikolay V. Gromov, Tatiana B. Medvedeva, Ivan A. Lukoyanov, Valentina N. Panchenko, Maria N. Timofeeva, Oxana P. Taran, Valentin N. Parmon
| Format: | Article |
|---|---|
| Diterbitkan: | MDPI AG 2022-10-01 |
Deskripsi
Bifunctional solid acidic quaternary ammonium salts of Keggin-type vanadium-containing heteropoly acids, such as R<sub>3.5</sub>H<sub>0.5</sub>PVMo<sub>11</sub>O<sub>40</sub> (R: (C<sub>2</sub>H<sub>5</sub>)<sub>4</sub>N, (C<sub>4</sub>H<sub>9</sub>)<sub>4</sub>N, (C<sub>6</sub>H<sub>13</sub>)<sub>4</sub>N), and [(C<sub>4</sub>H<sub>9</sub>)<sub>4</sub>N]<sub>4.5</sub>H<sub>0.5</sub>SiW<sub>11</sub>VO<sub>40</sub>, are capable of one-pot hydrolysis-oxidationconversion (OxFA-processing) of starch to biogenic formic acid. The impact of the reaction conditions and catalyst type was revealed. The highest formic acid yield of 50% was achieved over the best [(C<sub>2</sub>H<sub>5</sub>)<sub>4</sub>N]<sub>3.5</sub>H<sub>0.5</sub>PVMo<sub>11</sub>O<sub>40</sub> catalyst, which was active and stable in seven reaction cycles. The kinetic computational model, which described formic acid formation well, was proposed in the presence of the most active [(C<sub>2</sub>H<sub>5</sub>)<sub>4</sub>N]<sub>3.5</sub>H<sub>0.5</sub>PVMo<sub>11</sub>O<sub>40</sub> catalyst.