Enantioselective hydrogenation of ethyl pyruvate: Long-term performance of chirally modified Pt/zeolite catalysts
作者： U Böhmer , F Franke , K Morgenschweis , T Bieber , W Reschetilowski
DOI: 10.1016/S0920-5861(00)00333-3
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摘要: Abstract The long-term performance of 5 wt.% Pt/zeolite catalysts (HNaY with different degrees ion exchange) modified (−)cinchonidine was studied. enantioselective hydrogenation ethyl pyruvate to R (+)ethyl lactate used as the model reaction. Pt/zeolites are effective for use, if chiral modifier is added before each cycle hydrogenation. optimal ratio between amount catalyst and essentially depends on both specific Pt surface area solvent used. It found that use acetic acid results in a higher than cyclohexane. This due competitive adsorption auxiliary surface. Furthermore, acidity weakening (−)cinchonidine/Pt interaction, which prevents an overloading or its decay products. effect determined by means differential thermal analysis elemental analysis. When cyclohexane solvent, significantly improved raising carrier acidity.
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