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首页> 外文期刊>Catalysis science & technology >Selective conversion of lactic acid to acrylic acid over alkali and alkaline-earth metal co-modified NaY zeolites
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Selective conversion of lactic acid to acrylic acid over alkali and alkaline-earth metal co-modified NaY zeolites

机译：乳酸的丙烯酸选择性转换酸/碱和碱土金属co-modified反对zeolites

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摘要

Alkali and alkaline-earth metal cation co-modified NaY zeolites were systematically synthesized and comprehensively investigated as catalysts for gas-phase dehydration of lactic acid (LA) to acrylic acid (AA). The long-term (time-on-stream >55 h) catalytic performance in four repeated reaction-regeneration cycles was studied. The best performing catalyst shows a consistently high AA selectivity of ～84% at different weight hourly space velocity (WHSV) values ranging from 0.48 to 4.8 h~(-1). Most importantly, the catalyst can still deliver a high AA selectivity of ～82% after four long-term reaction-regeneration cycles. The investigation shows that mild etching increases the defect density of the zeolite and thus leads to poor hydrothermal stability in the long-term reaction-regeneration cycles. The strong acidic adsorbate/catalyst surface interaction (base property) and the acidity of the catalyst are responsible for the catalyst deactivation. The role of the alkali and alkaline-earth metal cations and the transformation of these cations during the reaction and regeneration process are presented.
机译：碱金属和碱土金属阳离子co-modified不吸附系统合成全面调查作为催化剂乳酸(LA)的气相脱水丙烯酸(AA)。> 55 h)催化性能在四个重复reaction-regeneration周期进行了研究。表现最佳的催化剂显示了一致在不同的重量~ 84% AA选择性高从时空速(WHSV)值0.48 - 4.8 h ~(1)。仍然可以提供高AA选择性催化剂~ 82%的四个长期reaction-regeneration周期。表明,轻度腐蚀缺陷增加沸石的密度,从而导致贫穷热液的长期稳定reaction-regeneration周期。被吸附物/催化剂表面相互作用(基地属性)和催化剂的酸度负责催化剂失活。碱金属和碱土金属的作用阳离子和这些阳离子的变换在反应和再生过程提出了。

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