摘要
以共沉淀方法制备了杂多酸盐催化剂ＣｓｙＰ１．３３－ｋＭｏ１２ＳｂｌＣｕｍＶｎＡｓｋＯｘ．利用ＩＲ及ＳＥＭ研究了催化剂的结构，ＤＳＣ研究了催化剂的稳定性，ＥＳＲ研究了催化剂的氧化还原性，及ＮＨ３－ＴＰＤ研究了催化剂的酸性．同时考察了催化剂对异丁醛一步氧化制甲基丙烯酸的催化性能，并与催化剂的氧化还原性进行了关联．发现Ｃｓ１．５Ｐ１．１３Ｍｏ１２Ｓｂ０．２５Ｃｕ０．２５Ｖ０．２５Ａｓ０．２０Ｏｘ催化剂使异丁醛氧化的目的产物甲基丙烯酸收率最高，达７０．１％．
Molybdophosphoric acid with Keggin structure is an effective catalyst for oxidative reactions. As the central atom, coordinated atom and equilibrium ion in molybdophosphoric acid are displaced in a suitable manner, it exhibits increasing catalytic activity although the structure of the anion keeps unchanged. In this paper, the Cs y P 1.33- k Mo 12 Sb l Cu m V n As k O x catalysts were synthesized by a co precipitation method. The structure of the catalysts was characterized by means of XRD, IR and SEM. The thermal stability of the catalysts was characterized by DSC. The redox property of the catalysts was systematically characterized by ESR. The acidity of the catalysts was characterized by NH 3 TPD. The catalytic performance over the Cs y P 1.33- k Mo 12 Sb l Cu m V n As k O x catalysts for one step oxidation of isobutyraldehyde to produce methacrylic acid was measured too. The relation between the redox property and catalytic performance was discussed. The experimental results indicated that the Cs 1.5 P 1.13 Mo 12 Sb 0.25 Cu 0.25 V 0.25 As 0.20 O x catalyst is a good catalyst for the mentioned reaction (the yield of methacrylic acid is 70 1%).
出处
《催化学报》
SCIE
EI
CAS
CSCD
北大核心
1996年第4期306-310,共5页
基金
中国石化总公司资助
关键词
杂多钼磷酸盐
异丁醛
氧
甲基丙烯酸
催化剂
Heteropoly molybdophosphate, Isobutyraldehyde, One step oxidation, Methacrylic acid, Redox property, Stability
