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1
Content available remote Mikroreaktor krzemowo-szklany do syntezy 2-izopropoksy-5- nitrobenzaldehydu
Knapkiewicz P., Skowerski K., Jaskólska D. E. D. E., Kowalski P., Olszewski T.
Przegląd Elektrotechniczny
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2012
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R. 88, nr 10b
98-100
PL
W niniejszym artykule przedstawiono mikroreaktor krzemowo-szklany oraz jego zastosowanie w reakcji selektywnego nitrowania 2- izopropoksy benzaldehydu do 2-izopropoksy-5-nitrobenzaldehydu, ważnego elementu budulcowego nitrowego katalizatora metatezy olefin typu Hoveydy-Grubbsa. Mikroreaktor wykonano technikami mikroinżynieryjnymi z krzemu i szkła, materiałów odpornych na środowisko nitrowania. Dodatkowo mikroreaktor wyposażono w miniaturowe czujniki temperatury oraz zaplanowano wykorzystanie miniaturowych, odpornych na korozję czujników ciśnienia.
EN
Herein we describe a flow-through silicon-glass microreactor and its application in selective nitration of 2-isopropoxybenzaldehyde to 2- isopropoxy-5-nitrobenzaldehyde, important building block of nitro-substituted metathesis catalyst of type Hoveyda-Grubbs. The flow-through microreactor was fabricated using microengineering techniques from silicon and glass, materials resistant to nitration environment. Microreactor is equipped with miniature temperature sensors and with resistant to corrosion pressure sensors.
2
Content available remote Metateza olefin jako podstawa zrównoważonych technologii chemicznych
Marciniec B.
Przemysł Chemiczny
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2007
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T. 86, nr 1
15-23
3
Content available remote Metathesis of methyl erucate in the presence of WOCl4/Et4Pb catalyst on a large laboratory scale
Walisiewicz-Niedbalska W., Skupiński W., Mol J.C., Kosmacińska B., Pawlak I.
Polish Journal of Chemical Technology
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2002
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Vol. 4, nr 1
24-27
EN
Metathesis of methyl erucate was carried out in the presence of a WOCl4/Et4Pb (Et = ethyl) catalyst on a small laboratory scale (1 g) and on a large laboratory scale (800 g). In either case, the yield and selectivity of metathesis products were identical. This larger scale allowed to separate the main products by applying two distillation and two crystallization stage procedures. A detailed analysis of the products allowed to infer about the reactions occurring in the system studied.
4
MoO3/Al2O3 catalytic systems prepared by conventional impregnation and equilibrium adsorption: activity in propene metathesis
Handzlik J., Ogonowski J.
Polish Journal of Applied Chemistry
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2000
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Vol. 44, nr 4
195-203
EN
The MoO3/Al(2)0(3) catalytic systems were studied. The catalysts were prepared via the conventional impregnation and the equilibrium adsorption techniques. The influence of the applied impregnation method and the impregnation conditions on the catalytic activity in propene metathesis at T = 303 K was investigated. It was shown that the activity of the catalysts depends not only on the molybdenum loading but also on the applied method of the catalysts preparation. In the case of the conventional impregnation technique, the metathesis activity of the catalysts with the same molybdenum loading was strongly affected by the initial pH of the impregnation slurry.
5
Content available remote Metateza heksenu-1wobec układu katalitycznego WOCI4/AI2O3-SiO2/RnM
Maksimowski P., Skupiński W.
Przemysł Chemiczny
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1999
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T. 78, nr 9
332-335
6
Activity of molybdena-alumina catalysts in propene metathesis: effect of the catalyst pretreatment and activation
Handzlik J., Ogonowski J.
Polish Journal of Applied Chemistry
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1999
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Vol. 43, nr 1-2
47-56
EN
Propene metathesis reaction in the presence of MoOJ/Al2OJ catalytic systems was investigated. The catalysts studied were highly selective and moderately active in propene metathesis at low temperature (303 K). The effect of preliminary thermal treatment and in situ activation on the catalyst activity was studied. Replacement of the standard calcination of the catalyst precursor with heating the precursor under vacuum improved the rate of the metathesis of diluted propene. The influence of the catalyst reduction and subsequent reoxidation on its activity was investigated too. The catalysts studied were characterised by XRD.
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