TY - JOUR
T1 - Alcohol dehydration reactions over tungstated zirconia catalysts
AU - Larsen, Gustavo
AU - Lotero, Edgar
AU - Petkovic, Lucía M.
AU - Shobe, David S.
N1 - Funding Information:
This research was supported by the donors of the Petroleum Research Fund (Grant 31067-AC5). Beamtime at the Brookhaven National Laboratory is gratefully acknowledged. One of us (L.M.P.) thanks the University of San Juan, Argentina, for supporting her graduate work at the University of Nebraska–Lincoln. We thank the referees for their valuable comments.
PY - 1997
Y1 - 1997
N2 - The behavior of tungstated zirconia (WZ) toward dehydration of 1-propanol, 2-propanol, and tert.-butanol was compared with that of H-mordenite. For 1- and 2-propanol, the desorption temperatures of olefinic products formed over the WZ catalyst were found to be very close to those observed in H-mordenite; however, the zeolite catalyst had a much larger tendency to retain (or to readsorb) olefins in the pores in the form of oligomerization products, as evidenced by the detection of the m/e = 65 signal (cyclopentadienyl cation) during the temperature-programmed reaction of 2-propanol. The Brønsted acid sites of the zeolite underwent rapid H+/D+ exchange when 2-propanol deuterated in its hydroxyl group was used. This allowed the olefinic products to incorporate deuterium during reaction. On the other hand, the WZ catalyst did not effect the H+/D+ exchange of propene formed from CH3-HCOD-CH3, presumably because olefin readsorption onto hydrated W6+ sites does not take place. The structure of the WZ catalyst was monitored by EXAFS and XRD.
AB - The behavior of tungstated zirconia (WZ) toward dehydration of 1-propanol, 2-propanol, and tert.-butanol was compared with that of H-mordenite. For 1- and 2-propanol, the desorption temperatures of olefinic products formed over the WZ catalyst were found to be very close to those observed in H-mordenite; however, the zeolite catalyst had a much larger tendency to retain (or to readsorb) olefins in the pores in the form of oligomerization products, as evidenced by the detection of the m/e = 65 signal (cyclopentadienyl cation) during the temperature-programmed reaction of 2-propanol. The Brønsted acid sites of the zeolite underwent rapid H+/D+ exchange when 2-propanol deuterated in its hydroxyl group was used. This allowed the olefinic products to incorporate deuterium during reaction. On the other hand, the WZ catalyst did not effect the H+/D+ exchange of propene formed from CH3-HCOD-CH3, presumably because olefin readsorption onto hydrated W6+ sites does not take place. The structure of the WZ catalyst was monitored by EXAFS and XRD.
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U2 - 10.1006/jcat.1997.1698
DO - 10.1006/jcat.1997.1698
M3 - Article
AN - SCOPUS:0000482501
SN - 0021-9517
VL - 169
SP - 67
EP - 75
JO - Journal of Catalysis
JF - Journal of Catalysis
IS - 1
M1 - CA971698
ER -