Nanocrystalline MgO catalysts for the Henry reaction of benzaldehyde and nitromethane
Nanocrystalline MgO catalysts for the Henry reaction of benzaldehyde and nitromethane
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DOI：
10.1016/j.molcata.2011.03.018
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发表时间：
2011-05
影响因子：
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通讯作者：
Yuanzhou Xi;R. Davis
中科院分区：
文献类型：
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作者：
Yuanzhou Xi;R. Davis
Nanocrystalline MgO particles of about 3 nm were examined as catalysts for the Henry reaction between benzaldehyde and nitromethane at 273 K. The surface area of nanocrystalline MgO was greater than 600 m2g−1except after thermal treatment in N2at 823 K, which reduced the surface area to 359 m2g−1. The areal rate of the Henry reaction over nanocrystalline MgO at 273 K was 0.015 ± 0.002 μmol m−2s−1and was independent of pretreatment temperature over the range of 523–823 K. Addition of (S)-BINOL to nanocrystalline MgO has been reported previously to favor the production of one enantiomer of the Henry reaction. In the current work, negligible enantiomeric excess was observed on (S)-BINOL-modified nanocrystalline MgO catalysts, regardless of the source of nanocrystalline MgO, the MgO activation temperature, the reaction temperature, the sequence of reactant addition or the loading of (S)-BINOL. Adsorption ofl-proline onto nanocrystalline MgO catalyst induced a small enantiomeric excess in the Henry reaction products, but the catalytic activity of the catalyst was low.
