【摘要】 采用浸渍法制备了负载型杂多酸催化剂,并对杂多酸在载体上负载的牢固度、分散性、热稳定性和酸性进行了研究。结果表明,杂多酸负载的牢固度与载体的表面化学性质及孔结构有关;对于比表面积为432 m~2/g的硅胶载体来说,当负载量不超过30％时,磷钨酸呈单层分散状态;杂多酸负载后热稳定性有所下降;因杂多酸与载体间存在相互作用,负载后杂多酸的酸性下降,负载后的杂多酸除B酸中心外,还存在L酸中心。更多还原

【Abstract】 The supported heteropolyacids catalyst was prepared by impregnation. The fixation stability, degree of dispersion, thermal stability and acidity of the hetropolyacids over some supportswere investigated. The results showed that the fixation stability of the hetropolyacids over the supportsdepended on both of the surface chemical properties and the pore structure of the supports. The tungsto-phosphoric acid loaded on a specific surface area of 432m~2/g silica gel carrier was in the form of monolay-ered dispersion while its loading less than 30％. The thermal stability of the supported hetropolyacidswas somewhat reduced, and its acidity was also declined due to the interaction of the hetropolyacids andthe supports. Besides Bronsted acid sites, Lewis acid sites were also existed in the supported hetropoly-acids.更多还原