Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
50864 | Catalysis Communications | 2010 | 4 Pages |
Abstract
Bentonite clay impregnated with dodecatungstophosphoric acid (20% DTP/BNT) showed an excellent activity, selectivity and stability [95% product yield with 94% selectivity to 2, 2′-methylenebis (4-methylphenol), DAM] for the hydroxyalkylation of p-cresol with formaldehyde at 353 K and for a mole ratio of 5. Ammonia-TPD results showed that an increase in total concentration of acid sites from 4.9 of parent bentonite to 11.6 micromoles per surface area NH3 (μmolS− 1 NH3) of 20% DTP/BNT was due to a strong interaction of protons of bulk DTP with surface hydroxyl groups of BNT as evidenced by 31P NMR studies.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Catalysis
Authors
A.C. Garade, V.S. Kshirsagar, A. Jha, C.V. Rode,