TY - JOUR
T1 - In situ FT-IR microscopic investigationof metal substituted AIPO4-5 single crystals
AU - Müller, G.A.
AU - Bodis, E.
AU - Mirth, G.C.
AU - Kornatowski, J.
AU - Lercher, J.A.
PY - 1997
Y1 - 1997
N2 - First direct spectroscopic evidence for the existence of Brønsted acid sites in AlPO4-5 (AFI) single crystal molecular sieves substituted with divalent metal cations is reported. Ammonia and pyridine were used as probe molecules. Compared with unsubstituted AlPO4-5 single crystals, the metal substituted samples exhibit well-developed bands of isolated hydroxyl groups and a broad absorption band indicating the existence of hydrogen bonded OH groups. Upon adsorption of pyridine on the metal substituted samples the formation of a new, relatively free vibrating hydroxyl group (¿oh = 3690¿3694 cm¿1 was observed, giving evidence for a strong Lewis type interaction leading to the cleavage of a metal-oxygen bond close or at the position of the substituting metal cation.
AB - First direct spectroscopic evidence for the existence of Brønsted acid sites in AlPO4-5 (AFI) single crystal molecular sieves substituted with divalent metal cations is reported. Ammonia and pyridine were used as probe molecules. Compared with unsubstituted AlPO4-5 single crystals, the metal substituted samples exhibit well-developed bands of isolated hydroxyl groups and a broad absorption band indicating the existence of hydrogen bonded OH groups. Upon adsorption of pyridine on the metal substituted samples the formation of a new, relatively free vibrating hydroxyl group (¿oh = 3690¿3694 cm¿1 was observed, giving evidence for a strong Lewis type interaction leading to the cleavage of a metal-oxygen bond close or at the position of the substituting metal cation.
U2 - 10.1016/S0022-2860(96)09578-6
DO - 10.1016/S0022-2860(96)09578-6
M3 - Article
VL - 410-41
SP - 173
EP - 178
JO - Journal of molecular structure
JF - Journal of molecular structure
SN - 0022-2860
ER -