Ceria and lanthana as blocking modifiers for the external surface of MFI zeolite

Jang, Hoi-Gu, Ha, Kwang, Kim, Jong-Ho, Sugi, Yoshihiro and Seo, Geo (2014) Ceria and lanthana as blocking modifiers for the external surface of MFI zeolite. Applied Catalysis A: General, 476 175-185. doi:10.1016/j.apcata.2014.02.028

Author Jang, Hoi-Gu
Ha, Kwang
Kim, Jong-Ho
Sugi, Yoshihiro
Seo, Geo
Title Ceria and lanthana as blocking modifiers for the external surface of MFI zeolite
Journal name Applied Catalysis A: General   Check publisher's open access policy
ISSN 0926-860X
Publication date 2014-04-22
Year available 2014
Sub-type Article (original research)
DOI 10.1016/j.apcata.2014.02.028
Open Access Status
Volume 476
Start page 175
End page 185
Total pages 11
Place of publication Amsterdam, Netherlands
Publisher Elsevier
Collection year 2015
Language eng
Subject 1503 Business and Management
1508 Process Chemistry and Technology
Abstract The ceria- and lanthana-modified MFI zeolites were prepared and extensively investigated to verify the function of lanthanide oxides as blocking modifiers. Their catalytic behavior in the methanol-to-olefin (MTO) conversion was explained by the characterization results regarding crystallinity, agglomeration, porosity, surface composition, and the uptakes of o-xylene and methanol. The ceria impregnated on the MFI formed nano-sized small particles with two oxidation states of +3 and +4 (Ce2O3 and CeO 2) on the surface and was located predominantly on the external surface. So, the ceria impregnation maintained the porosity and activity of the MFI, and induced little change in the conversion and product composition of MTO. However, the lanthana impregnated on the MFI dispersed as a single lanthana (La2O3) phase in its micropores, as well as on the external surface. The blocking of the micropores and reduction of acidity by lanthana impregnation lowered the activity of the lanthana-modified MFI in MTO. The ceria located on the external surface of MFI did not have any negative effects on the catalytic performance, while the lanthana dispersed in the micropores lowered the conversion in MTO. The locations and dispersed states of ceria and lanthana were systematically discussed in the relation to their catalytic performance as blocking modifiers.
Keyword MFI zeolite
Ceria and lanthana impregnation
MTO reaction
Catalytic performance
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2015 Collection
Australian Institute for Bioengineering and Nanotechnology Publications
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