Stereo-selective hydrogenation of 3-hexyne over low-loaded palladium catalysts supported on mesostructured materials
[Display omitted] ▶ Preparation, characterisation and screening of palladium based catalysts. ▶ Mesostructured materials were used as support of palladium catalysts. ▶ 1% Pd/SBA-15 showed high activity and stereo-selectivity for semi-hydrogenation of 3-hexyne. ▶ The starting 3-hexyne produces primar...
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Veröffentlicht in: | Applied catalysis. A, General General, 2010-10, Vol.387 (1), p.26-34 |
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Sprache: | eng |
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▶ Preparation, characterisation and screening of palladium based catalysts. ▶ Mesostructured materials were used as support of palladium catalysts. ▶ 1% Pd/SBA-15 showed high activity and stereo-selectivity for semi-hydrogenation of 3-hexyne. ▶ The starting 3-hexyne produces primarily
cis-3-hexene, which subsequently is either hydrogenated to hexane or isomerized to
trans-3-hexene and 2-hexenes that are found in very small amounts depending on the nature of the support used.
This paper studies the effect of mesostructured materials in the stereo-selective hydrogenation of 3-hexyne at 298
K and 40
psig pressure of H
2 over Pd-supported catalysts at different substrate:palladium (S:Pd) molar ratios. The catalysts were prepared by impregnation using a toluene solution of Pd(acac)
2 to obtain a metal content close to 1
wt.% over SBA-15 with one-dimensional hexagonal structure, MCM-48 silica with cubic structure and three-dimensional pore system and MSU-γ alumina with a lathlike particle morphology. All the supports were characterised by nitrogen adsorption–desorption isotherms at 77
K, TEM, XRD and H
2 chemisorption and TEM measurements. The reactions were found to be zero order with respect to 3-hexyne concentration. The starting 3-hexyne produces primarily
cis-3-hexene, which subsequently is either hydrogenated to hexane or isomerized to
trans-3-hexene and 2-hexenes that are found in very small amounts depending on the nature of the support used. Palladium catalysts supported on SBA-15 was the most active and selective catalyst. |
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ISSN: | 0926-860X 1873-3875 |
DOI: | 10.1016/j.apcata.2010.07.062 |