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Kwak, Ja Hun
Molecular Catalysis lab
Research Interests
  • Heterogeneous catalysis, molecular catalysis, ASlumima, zeolites

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Highly Dispersed and Active ReOx on Alumina-Modified SBA-15 Silica for 2-Butanol Dehydration

Cited 6 times inthomson ciCited 6 times inthomson ci
Title
Highly Dispersed and Active ReOx on Alumina-Modified SBA-15 Silica for 2-Butanol Dehydration
Other Titles
Highly Dispersed and Active ReOx on Alumina-Modified SBA-15 Silica for 2-Butanol Dehydration
Author
She, XiaoyanKwak, JahunSun, JunmingHu, JianzhiHu, Mary Y.Wang, ChongminPeden, Charles H. F.Wang, Yong
Keywords
rhenia catalyst; catalyst stability; 2-butanol dehydration; SBA-15; in situ UV-vis (DRS); aberration-corrected TEM; Al-27 MAS NMR
Issue Date
2012-06
Publisher
AMER CHEMICAL SOC
Citation
ACS CATALYSIS, v.2, no.6, pp.1020 - 1026
Abstract
SBA-15 silica supported rhenium catalysts were synthesized using solution-based atomic layer deposition method, and their activity and stability were studied in the acid-catalyzed 2-butanol dehydration. We find that ReOx/SBA-15 exhibited an extremely high initial activity but a fast deactivation for 2-butanol dehydration at 90-105 degrees C. Fast deactivation was likely due to the sintering, sublimation, and reduction of rhenia as confirmed by TEM, elemental analysis, and in situ UV-vis (DRS) measurements. To overcome these issues, ReOx/AlOx/SBA-15 catalysts with significantly improved stability were prepared by first modifying the surface identity of SBA-15 with alumina followed by dispersion of rhenia using atomic layer deposition. The AlOx phase stabilizes the dispersion of small and uniform rhenia clusters (<2 nm) as as confirmed by TEM, STEM, and UV-vis (DRS) characterizations. Additional Al-27 MAS NMR characterization revealed that modification of the SBA-15 surface with alumina introduces a strong interaction between rhenia and alumina, which consequently improves the stability of supported rhenia catalysts by suppressing the sintering, sublimation, and reduction of rhenia albeit at a moderately reduced initial catalytic dehydration activity
URI
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DOI
10.1021/cs2006444
ISSN
2155-5435
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ECHE_Journal Papers
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