Wang Yumeng, Hou Yuelin, Hao Xue, Wang Zhenlu, Zhu Wanchun
Key Laboratory of Surface and Interface Chemistry of Jilin Province, College of Chemistry, Jilin University Jiefang Road 2519 Changchun 130021 P. R. China
RSC Adv. 2019 Feb 18;9(11):5958-5966. doi: 10.1039/c8ra09241a.
Mo, W, Cr, La, and Ce additives were introduced into a VPO catalyst, and the resulting catalysts were investigated for the gas-phase aldol condensation reaction of formaldehyde and acetic acid. XRD, FT-IR, SEM, NH-TPD, Py-IR, and BET were used to characterize the structure and properties of the catalysts. After the addition of the third component, the crystal structure changed to a certain extent; the surface acidity of the catalyst changed, and the conversion of acetic acid and the selectivity of acrylic acid also showed different degrees of influence. The acidity of the catalyst was the main factor affecting the catalytic performance. When La was added to the catalyst, the selectivity for acrylic acid was the highest, and the stability of the catalyst also improved. It is presumed that B acid is the main active site of this reaction, and a moderate amount of acid is favorable to facilitate the reaction.
将钼、钨、铬、镧和铈添加剂引入到VPO催化剂中，并对所得催化剂进行甲醛和乙酸的气相羟醛缩合反应研究。采用XRD、FT-IR、SEM、NH-TPD、Py-IR和BET对催化剂的结构和性能进行表征。添加第三组分后，晶体结构有一定程度的变化；催化剂的表面酸度发生改变，乙酸转化率和丙烯酸选择性也呈现出不同程度的影响。催化剂的酸度是影响催化性能的主要因素。当向催化剂中添加镧时，丙烯酸的选择性最高，且催化剂的稳定性也有所提高。推测B酸是该反应的主要活性位点，适量的酸有利于促进反应。
