III International Conference

PP-II-20Bidentate formate (ν as (COO) = 1560, ν s (COO) = 1370 cm -1 ) is the main form of theinteraction between formaldehyde and V 2 O 5 /TiO 2 catalyst. The readsorption of formic acid onV 2 O 5 /TiO 2 catalyst leads to formation of asymmetrical formates (ν as (COO) = 1668, ν s (COO)= 1220 cm -1 ).The adsorption of HCOOH on investigated catalysts leads to the formation of bidentateformates (ν as (COO) = 1587 - 1552, ν s (COO) = 1383 – 1360 cm -1 ), asymmetrical formates(ν as (COO) = 1668, ν s (COO) = 1220 cm -1 ) and H-bonded formic acid (ν as (COO) = 1730 -1714, ν s (COO) = 1190 - 1170 cm -1 ) (Fig 1, b).15602% CH 2O/air1% HCOOH/aira1555b172016681590137012201717166815871370122011701'Absorbance1640139014801467143013831231714173015521383136011902'3'1800 1500 1200 1800 1600 1400 1200Wavenumber, cm -1Figure 1. In situ FTIR spectra of surface species during formaldehyde oxidation (a) andformic acid decomposition (b) over supported vanadia catalysts: 1, 1’ - V 2 O 5 /TiO 2 (120 o C),2, 2’ - V 2 O 5 /Al 2 O 3 (120 o C), 3, 3’ - V 2 O 5 /SiO 2 (80 o C)The kinetics of the formation and the decomposition of surface formates arising duringformaldehyde oxidation and formic acid decomposition over supported vanadia catalysts wasstudied. The effect of the support on the structure and the reactivity of surface intermediateswas displayed.AcknowledgementThe work was supported by the Russian Foundation for Basic Research, Grant06-03-08137-ofs and Grant 06-03-32473.References1. M. Ai, J. Catal., 83 (1983) 1412. G.Ya. Popova, T.V. Andrushkevich and G.A. Zenkovets, Kinet. Catal., 1997, 38, 285.200