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首页> 外文期刊>RSC Advances >Efficient production of acrylic acid by dehydration of lactic acid over BaSO4 with crystal defects
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Efficient production of acrylic acid by dehydration of lactic acid over BaSO4 with crystal defects

机译：在具有晶体缺陷的BaSO 4 上乳酸脱水可高效生产丙烯酸

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BaSO4 catalysts with different micromorphologies and crystal texture were prepared and used to investigate the structure–activity relationship in the dehydration reaction of lactic acid (LA) to acrylic acid (AA). SEM and N2 physisorption were used to study the micromorphology. XRD and photoluminescence spectra were employed to analyze the crystal texture of samples prepared with different methods and treatments. The results revealed that BaSO4 with smaller crystals and more defects had higher activity and selectivity to AA. It was likely that the crystal defects provided the active acid sites for dehydration of LA to AA, as evidenced by XPS and NH3-TPD measurements. Using ethanol as the solvent and ultrasound treatment during the preparation of BaSO4, imperfect small crystals with more defects were formed, which increased the AA selectivity to 78.8%.
机译：制备了具有不同微观形貌和晶体织构的BaSO 4 催化剂，并用于研究乳酸（LA）脱水成丙烯酸（AA）脱水反应中的构效关系。 。扫描电镜和N 2 物理吸附作用研究其微观形貌。用XRD和光致发光光谱分析了用不同方法和处理方法制备的样品的晶体结构。结果表明，晶体较小，缺陷较多的BaSO 4 具有较高的活性和对AA的选择性。 XPS和NH 3 -TPD测量结果证明，晶体缺陷可能为LA脱水成AA提供了活性酸位。 BaSO 4 制备过程中，以乙醇为溶剂，经超声处理，形成缺陷多的不完善小晶体，使AA的选择性提高到78.8％。

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