Search

Your search keyword '"controlled size Pt nanoparticles"' showing total 2 results
Start Over Descriptor "controlled size Pt nanoparticles"
2 results on '"controlled size Pt nanoparticles"'

1. Tuning the Activity and Selectivity of Phenylacetylene Hydrosilylation with Triethylsilane in the Liquid Phase over Size Controlled Pt Nanoparticles.

Author

G. Dobó, Dorina, Sipos, Dániel, Sápi, András, London, Gábor, Juhász, Koppány L., Kukovecz, Ákos, and Kónya, Zoltán

Subjects
*ETHYNYL benzene, *NANOPARTICLE synthesis
Abstract

Pt nanoparticles with controlled sizes between 1.6-7.0 nm were anchored onto the surface and pores of SBA-15 silica support. The catalysts were characterized by TEM-ED, BET, XRD, and ICP-MS techniques and were tested in liquid phase hydrosilylation of phenylacetylene with triethylsilane. The activity of the 7.0 nm Pt nanoparticles anchored onto the surface of SBA-15 in hydrosilylation (TOF = 0.107 molecules·site-1·s-1) was ~2 times higher compared to the 5.0 nm Pt/SBA-15 (TOF = 0.049 molecules·site-1·s-1) catalyst and ~10 times higher compared to the 1.6 nm Pt/SBA-15 (TOF = 0.017 molecules·site-1·s-1) catalyst. Regarding the selectivity, bigger nanoparticles produced more vinylsilane-type products (α- and β-(E)-products) and less side products (mainly ditriethylsilane, triethyl(1-phenylethyl)silane and triethyl(phenethyl)silane derived likely from the reduction of the vinylsilane products). However, the selectivity towards the β-(E)-triethyl(styryl)silane was higher in the case of 1.6 nm Pt/SBA-15 catalyst compared to 5.0 nm Pt/SBA-15 and 7.0 nm Pt/SBA-15, respectively, which can be attributed to the beneficial effect of the size differences of the Pt nanoparticles as well as the differences of the quality and quantity of Pt/SiO2 interfaces. [ABSTRACT FROM AUTHOR]

Published
2018
Full Text
View/download PDF

2. Tuning the Activity and Selectivity of Phenylacetylene Hydrosilylation with Triethylsilane in the Liquid Phase over Size Controlled Pt Nanoparticles

Author

Koppány L. Juhász, Gábor London, András Sápi, Dorina Gabriella Dobó, Ákos Kukovecz, Zoltán Kónya, and Dániel Sipos

Subjects
catalysis by design, Materials science, controlled size Pt nanoparticles, Hydrosilylation, 05.07. Társadalom- és gazdaságföldrajz, Nanoparticle, 010402 general chemistry, lcsh:Chemical technology, 01 natural sciences, Catalysis, lcsh:Chemistry, chemistry.chemical_compound, hydrosilylation, Pt/SiO2 interface, lcsh:TP1-1185, Physical and Theoretical Chemistry, Vinylsilane, 010405 organic chemistry, 01.04. Kémiai tudományok, Silane, 0104 chemical sciences, chemistry, Phenylacetylene, lcsh:QD1-999, Triethylsilane, Selectivity, Nuclear chemistry
Abstract

Pt nanoparticles with controlled sizes between 1.6–7.0 nm were anchored onto the surface and pores of SBA-15 silica support. The catalysts were characterized by TEM-ED, BET, XRD, and ICP-MS techniques and were tested in liquid phase hydrosilylation of phenylacetylene with triethylsilane. The activity of the 7.0 nm Pt nanoparticles anchored onto the surface of SBA-15 in hydrosilylation (TOF = 0.107 molecules·site−1·s−1) was ~2 times higher compared to the 5.0 nm Pt/SBA-15 (TOF = 0.049 molecules·site−1·s−1) catalyst and ~10 times higher compared to the 1.6 nm Pt/SBA-15 (TOF = 0.017 molecules·site−1·s−1) catalyst. Regarding the selectivity, bigger nanoparticles produced more vinylsilane-type products (α- and β-(E)-products) and less side products (mainly ditriethylsilane, triethyl(1-phenylethyl)silane and triethyl(phenethyl)silane derived likely from the reduction of the vinylsilane products). However, the selectivity towards the β-(E)-triethyl(styryl)silane was higher in the case of 1.6 nm Pt/SBA-15 catalyst compared to 5.0 nm Pt/SBA-15 and 7.0 nm Pt/SBA-15, respectively, which can be attributed to the beneficial effect of the size differences of the Pt nanoparticles as well as the differences of the quality and quantity of Pt/SiO2 interfaces.

Published
2018

Catalog

Books, media, physical & digital resources
See catalog results