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Effect of metal-doped VPO catalysts for the aldol condensation of acetic acid and formaldehyde to acrylic acid

机译：金属掺杂VPO催化剂对乙酸和甲醛至丙烯酸的抗甲醇缩合的影响

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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 _(3) -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.
机译：将Mo，W，Cr，La和Ce添加剂引入VPO催化剂中，研究了所得催化剂的甲醛和乙酸的气相醛醇缩合反应。 XRD，FT-IR，SEM，NH _（3）-TPD，PY-IR和BET用于表征催化剂的结构和性质。在添加第三组分之后，晶体结构变为一定程度;催化剂的表面酸度改变，乙酸的转化率和丙烯酸的选择性也显示出不同程度的影响。催化剂的酸度是影响催化性能的主要因素。当加入到催化剂中时，丙烯酸的选择性最高，催化剂的稳定性也得到改善。推测B酸是该反应的主要活性位点，并且适量的酸是有利的，以促进反应。

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