Keggin heteropolyacid supported on BN and C3N4: Comparison between catalytic and photocatalytic alcohol dehydration

Selective oxidation of aromatic alcohols in the presence of C3N4 photocatalysts derived from the polycondensation of melamine, cyanuric and barbituric acids

“…It cannot be excluded a possible reaction of 4-OHBA with the basic sites on the photocatalyst resulting in the inactivation or partial poisoning of the C 3 N 4 photocatalyst. This behaviour has been previously observed for acidic heteropolyacids which inactivate the C 3 N 4 surface by an acid-base reaction [63]. Further research is underway to investigate the possible inactivation of C 3 N 4 by reaction with acid substrates.…”

Heteropolyacids supported on boron nitride and carbon nitride for catalytic and catalytic photo-assisted alcohol dehydration

“…) and (B), the Keggin structure is retained in the PW 12 /BN material, while the shift of the characteristic peaks of HPA in the case of PW 12 /C 3 N 4 and PW 12 /C 3 N 4 -TE composites suggests some structural changes in the HPA structure[34,[39][40][41]. Similar conclusions are drawn for the case of P 2 W 18 -based materials.…”

“…Figure S1 displays the PXRD patterns of the pristine supports, PW 12 and binary materials that were studied elsewhere [34]. From that previous study, it was concluded that the BN and C 3 N 4 supports preserve their structures after the HPAs deposition.…”

“…From that previous study, it was concluded that the BN and C 3 N 4 supports preserve their structures after the HPAs deposition. However, PW 12 itself, which was initially represented by H 3 PW 12 O 40 •21H 2 O (1534-ICSD) [35] became partially or, in the case of PW 12 /C 3 N 4 -TE, completely dehydrated, after being deposited on the solid supports [34,36,37]. Moreover, the formation of the ammonium salt of the [PW 12 O 40 ] 3cannot be excluded, as reported in literature [38].…”