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首页> 外文期刊>Journal de Chimie Physique et de Physico-Chimie Biologique >Synthese et caracterisation d'hydrotalcites Mg-Al. Application a l'aldolisation de l'acetone
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Synthese et caracterisation d'hydrotalcites Mg-Al. Application a l'aldolisation de l'acetone

机译：镁铝水滑石的合成与表征。在丙酮醛缩醛化中的应用

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Hydrotalcites were prepared with various Mg/Al ratios. The influence of aH and alkaline solution of the precipitation were examined. The compounds are well cristallized when the precipitation is done with NaOH+Na_2CO_3 alkaline solutions at aH near 10. These samples contain Cl~- and (CO_3)~(2-) compensating anions in the interlayer space. In all cases well defined hydrotalcites phases are obtained. By exchange reactions of the synthetized samples with Na_2CO_3 the Cl~- anions are totally removed. The production of diacetone alcohol by aldol condensation of acetone is an important industrial reaction using soda or potash as catalysts. The substitution of liquid base catalysts by solid catalysts is desirable to preserve environment. In this goal the basicity of Mg-Al hydrotalcites have been tested in the condensation reaction of acetone. It is also evidenced that for the activation temperature higher 400 deg C the catalytic activity of these materials increases with the content of (CO_3)~(2-) and the Mg/Al ratio.
机译：制备具有各种Mg / Al比率的水滑石。考察了aH和碱性溶液对沉淀的影响。当用NaOH + Na_2CO_3碱性溶液在接近10的aH下沉淀时，化合物具有良好的结晶性。这些样品在层间空间中包含Cl〜-和（CO_3）〜（2-）补偿阴离子。在所有情况下，均可获得定义明确的水滑石相。通过合成样品与Na_2CO_3的交换反应，Cl_-被完全去除。通过丙酮的醛醇缩合生产双丙酮醇是使用苏打水或钾盐作为催化剂的重要工业反应。为了保护环境，期望用固体催化剂代替液体碱催化剂。为此，已经在丙酮的缩合反应中测试了Mg-Al水滑石的碱度。也有证据表明，对于较高的活化温度400℃，这些材料的催化活性随（CO_3）〜（2-）的含量和Mg / Al比的增加而增加。

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