TY - JOUR
T1 - Influence of the chemical composition upon adsorption, coadsorption, and reactivity of ammonia and methanol on alkali-exchanged zeolites
AU - Kogelbauer, Andreas
AU - Gründling, Christian
AU - Lercher, Johannes A.
PY - 1996/2/1
Y1 - 1996/2/1
N2 - The interaction of ammonia and methanol with several alkali zeolites was studied by means of IR spectroscopy, mass spectrometry, and thermogravimetry. While ammonia adsorbed identically on all zeolites investigated, the adsorption complex of methanol subtly depended upon the concentration of lattice aluminum in the zeolite. This is attributed to the variation of the polarizability of the zeolite lattice induced by the varying chemical composition. With respect to the reaction of methanol with ammonia, the differences in the sorption of methanol led to variations in the reactivity of these zeolites toward the primary products monomethylamine and dimethyl ether. On zeolites with a high aluminum content, both products were formed in approximately equal concentrations, while with silicon-rich zeolites monomethylamine was the dominating product. With all alkali zeolites investigated methanol was significantly stronger adsorbed than ammonia.
AB - The interaction of ammonia and methanol with several alkali zeolites was studied by means of IR spectroscopy, mass spectrometry, and thermogravimetry. While ammonia adsorbed identically on all zeolites investigated, the adsorption complex of methanol subtly depended upon the concentration of lattice aluminum in the zeolite. This is attributed to the variation of the polarizability of the zeolite lattice induced by the varying chemical composition. With respect to the reaction of methanol with ammonia, the differences in the sorption of methanol led to variations in the reactivity of these zeolites toward the primary products monomethylamine and dimethyl ether. On zeolites with a high aluminum content, both products were formed in approximately equal concentrations, while with silicon-rich zeolites monomethylamine was the dominating product. With all alkali zeolites investigated methanol was significantly stronger adsorbed than ammonia.
UR - http://www.scopus.com/inward/record.url?scp=33748634633&partnerID=8YFLogxK
U2 - 10.1021/jp952284t
DO - 10.1021/jp952284t
M3 - Article
AN - SCOPUS:33748634633
SN - 0022-3654
VL - 100
SP - 1852
EP - 1857
JO - Journal of Physical Chemistry
JF - Journal of Physical Chemistry
IS - 5
ER -