Abstract
The MoZSM-5 (4.0 wt % Mo) catalyst has been characterized by high-resolution transmission electron microscopy, EDXA, and EPR. Two types of molybdenum-containing particles are stabilized in the catalyst in the course of nonoxidative methane conversion at 750°C. These are 2-to 10-nm molybdenum carbide particles on the zeolite surface and clusters smaller than 1 nm in zeolite channels. According to EPR data, these clusters contain the oxidized molybdenum form Mo5+. The surface Mo2C particles are deactivated at the early stages of the reaction because of graphite condensation on their surface. Methane is mainly activated on oxidized molybdenum clusters located in the open molecular pores of the zeolite. The catalyst is deactivated after the 420-min-long operation because of coke buildup on the zeolite surface and in the zeolite pores.
| Original language | English |
|---|---|
| Pages (from-to) | 389-394 |
| Number of pages | 6 |
| Journal | Kinetics and Catalysis |
| Volume | 47 |
| Issue number | 3 |
| DOIs | |
| Publication status | Published - May 2006 |
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ASJC Scopus subject areas
- Physical and Theoretical Chemistry
- Catalysis
Cite this
Properties and deactivation of the active sites of an MoZSM-5 catalyst for methane dehydroaromatization : Electron microscopic and EPR studies. / Zaikovskii, V. I.; Vosmerikov, A. V.; Anufrienko, V. F.; Korobitsyna, L. L.; Kodenev, E. G.; Echevskii, G. V.; Vasenin, N. T.; Zhuravkov, S. P.; Matus, E. V.; Ismagilov, Z. R.; Parmon, V. N.
In: Kinetics and Catalysis, Vol. 47, No. 3, 05.2006, p. 389-394.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Properties and deactivation of the active sites of an MoZSM-5 catalyst for methane dehydroaromatization
T2 - Electron microscopic and EPR studies
AU - Zaikovskii, V. I.
AU - Vosmerikov, A. V.
AU - Anufrienko, V. F.
AU - Korobitsyna, L. L.
AU - Kodenev, E. G.
AU - Echevskii, G. V.
AU - Vasenin, N. T.
AU - Zhuravkov, S. P.
AU - Matus, E. V.
AU - Ismagilov, Z. R.
AU - Parmon, V. N.
PY - 2006/5
Y1 - 2006/5
N2 - The MoZSM-5 (4.0 wt % Mo) catalyst has been characterized by high-resolution transmission electron microscopy, EDXA, and EPR. Two types of molybdenum-containing particles are stabilized in the catalyst in the course of nonoxidative methane conversion at 750°C. These are 2-to 10-nm molybdenum carbide particles on the zeolite surface and clusters smaller than 1 nm in zeolite channels. According to EPR data, these clusters contain the oxidized molybdenum form Mo5+. The surface Mo2C particles are deactivated at the early stages of the reaction because of graphite condensation on their surface. Methane is mainly activated on oxidized molybdenum clusters located in the open molecular pores of the zeolite. The catalyst is deactivated after the 420-min-long operation because of coke buildup on the zeolite surface and in the zeolite pores.
AB - The MoZSM-5 (4.0 wt % Mo) catalyst has been characterized by high-resolution transmission electron microscopy, EDXA, and EPR. Two types of molybdenum-containing particles are stabilized in the catalyst in the course of nonoxidative methane conversion at 750°C. These are 2-to 10-nm molybdenum carbide particles on the zeolite surface and clusters smaller than 1 nm in zeolite channels. According to EPR data, these clusters contain the oxidized molybdenum form Mo5+. The surface Mo2C particles are deactivated at the early stages of the reaction because of graphite condensation on their surface. Methane is mainly activated on oxidized molybdenum clusters located in the open molecular pores of the zeolite. The catalyst is deactivated after the 420-min-long operation because of coke buildup on the zeolite surface and in the zeolite pores.
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UR - http://www.scopus.com/inward/citedby.url?scp=33747508932&partnerID=8YFLogxK
U2 - 10.1134/S0023158406030104
DO - 10.1134/S0023158406030104
M3 - Article
VL - 47
SP - 389
EP - 394
JO - Kinetics and Catalysis
JF - Kinetics and Catalysis
SN - 0023-1584
IS - 3
ER -