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Effective dispersio...
Effective dispersion of Au and Au-M (M = Co, Ni, Cu and Zn) bimetallic nanoparticles over TiO2 grafted SBA-15 : their catalytic activity on dehydroisomerization of α-pinene
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- Samikannu, Ajaikumar (författare)
- Umeå universitet,Kemiska institutionen
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- Golets, Mikhail, 1987- (författare)
- Umeå universitet,Kemiska institutionen
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- Larsson, William (författare)
- Umeå universitet,Kemiska institutionen
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- Shchukarev, Andrey (författare)
- Umeå universitet,Kemiska institutionen,Technical Chemistry
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- Kordas, Krisztian (författare)
- Umeå universitet,Kemiska institutionen,Microelectronics and Materials Physics Laboratories, University of Oulu, FIN-90570 Oulu, Finland,Technical Chemistry
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- Leino, A-R (författare)
- Microelectronics and Materials Physics Laboratories, University of Oulu, FIN-90570 Oulu, Finland
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- Mikkola, Jyri-Pekka (författare)
- Umeå universitet,Kemiska institutionen,Technical Chemistry
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(creator_code:org_t)
- Amsterdam : Elsevier, 2013
- 2013
- Engelska.
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Ingår i: Microporous and Mesoporous Materials. - Amsterdam : Elsevier. - 1387-1811 .- 1873-3093. ; 173, s. 99-111
- Relaterad länk:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- Mesostructured siliceous SBA-15 was synthesized via direct hydrothermal crystallization from acidic solution of poly-(ethylene glycol)-block-poly(propylene glycol)-block poly(ethylene glycol)-copolymer and tetraethyl orthosilicate. The amorphous surface of the calcined Si-SBA-15 was modified with 20wt.% of TiO2 by chemical grafting method using titanium isopropoxide as the titanium source in ethanol solution. Various metal nanoparticles Au, Au-M (M = Co, Ni, Cu and Zn) were supported on TiO2/SBA-15 by deposition-precipitation method (DP) using urea as the precipitating agent. The structural features of the synthesized materials were characterized by various physico-chemical techniques such as X-ray diffraction, nitrogen sorption, XPS and HR-TEM. BET results of Si-SBA-15 revealed the formation of mesoporous structure with an average pore size of 5.9nm, pore volume of 1.12 cm3/g and the specific surface area of 846 m2/g. HR-TEM results demonstrated that metal nanoparticles were highly dispersed over TiO2/SBA-15 and long range ordering of hexagonal mesopores of Si-SBA-15 was well retained after loading of 20 wt.% TiO2 and 3 wt.% of bimetallic nanoparticles. The catalytic performances of the prepared catalysts were studied on dehydroisomerization of α-pinene under gas phase conditions using hydrogen atmosphere. The stability and catalytic activity of Au-M-TiO2/SBA-15 (DP) catalysts upon conversion of α-pinene in to p-cymene was explored in comparison with the catalysts prepared by conventional method. AuNi-TiO2/SBA-15 catalysts prepared via DP method were found to be stable upon longer reaction time as well as superior in terms of conversion and selective towards the formation of p-cymene.
Ämnesord
- NATURVETENSKAP -- Kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences (hsv//eng)
Nyckelord
- Supported bimetal catalysts
- TiO2/SBA-15
- Dehydroisomerization
- α-Pinene
- p-Cymene
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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