title: [Catalytic application of synthesizing n-butyl acrylate by a new type nanometer complex heteropoly acid catalyst H3PW12O40/SiO2].
abstract: A new nanometer complex heteropoly acid with Keggin structure, H3PW12O40/SiO2, were prepared by sol-gel method, and were characterized with IR, UV, XRD and TEM techniques. By means of this nanometer catalytic materials, the optimum conditions of the n-butyl acrylate synthesis have been studied. The results show that the complex heteropoly acid H3PW12O40/SiO2 nanoparticles have the mean grain size of 40 nm and they are typical amorphous. A strong chemical interaction exists between H3PW12O40 and silica surface. The nanoparticles have high catalytic activity for synthesizing n-butyl acrylate. The optimum catalytic conditions are as follows: the mole ratio of acrylic acid and n-butyl alcohol is 1:1.2, the reaction temperature is approximately 90-96 degrees C, and the catalyst quantity in the reaction is 10% of the acid mass. The conversion proportion is 94.37% and product yield 91.2% in 5 h. Apparently, the unique structure of the Keggin anions and surface acid center and the high specific surface area and the pseudoliquid phase of H3PW12O40/SiO2 play an important role in the esterification reactions with the acid catalyst.
authors.affiliation: Faculty of Chemistry and Molecular Science, Wuhan University, Wuhan 430072, China.
authors.forename: Li-qun
authors.initials: LQ
authors.lastname: Zhou
authors.forename: Shi-zhong
authors.initials: SZ
authors.lastname: Liu
authors.forename: Ju-tang
authors.initials: JT
authors.lastname: Sun
mesh_terms: D000179:Acrylates / Q000138:chemical synthesis* / Q000737:chemistry; D002384:Catalysis; D003460:Crystallization; D049329:Nanostructures; D036103:Nanotechnology; D012822:Silicon Dioxide / Q000737:chemistry; D014414:Tungsten / Q000737:chemistry
chemical_list: D000179:Acrylates; C032490:n-butyl acrylate; D012822:Silicon Dioxide; C036658:acrylic acid; D014414:Tungsten