原位法制备磷钨酸／SBA-15催化剂及其催化性能  

Preparation of 12-Tungstophosphoric Acid/SBA-15 Catalyst by In-situ Method and Its Catalytic Performance

作　　者：刘士荣[1] 郭红起[1] 毛明富[1] 倪忠斌[1] 陈明清[1] 

机构地区：[1]江南大学食品胶体与生物技术教育部重点实验室化学与材料工程学院,江苏无锡214122

出　　处：《精细化工》2013年第9期1031-1035,1060,共6页Fine Chemicals

摘　　要：用原位合成法制备了不同固载量的磷钨酸催化剂HPW/SBA-15,通过FTIR、TEM、XRD、31PNMR及N2-吸附脱附等方法对催化剂进行表征。结果表明,在低固载量时,原位法制备的催化剂保持了SBA-15材料的长程有序结构,并且随着固载量的提高,孔径、比表面积等均有所下降;固载量达到33.3%时,SBA-15材料的长程有序结构遭到一定的破坏;在载体孔壁中高度分散的磷钨酸仍然保持了Keggin特征结构,且与SBA-15材料的表面羟基存在一定的化学相互作用。对苹果酯合成的催化性能研究表明,乙酰乙酸乙酯的转化率可以达到87%以上,催化剂使用6次后,催化活性仍保持在85%。The catalysts of 12-tungstophosphoric acid/SBA- 15 with different loading capacity were prepared by in-situ method. The structure and properties of the catalysts were characterized by means of FTIR spectroscopy, TEM, X-ray diffraction,31 PNMR and N2 adsorption-desorption. The results show that, when the loading capacity was within the lower range, the catalysts retained the long range order structure of the SBA - 15 material. With the increase of loading capacity, the aperture and specific surface area decreased with the increase of loading capacity, However, the structure of SBA - 15 was destroyed in some degree when the loading capacity was up to 33.3%. The 12-tungstophoaphoric acid highly dispersed in the hole of SBA - 15 still kept the Keggin structure, and had certain chemical interaction with the surface hydroxy of SBA - 15. The catalytic properties in the synthesis of fructone show that HPW/SBA- 15 catalyst has high catalytic activity and selectivity, and shows excellent reusability.

关 键 词：SBA-15 磷钨酸 固载催化剂 苹果酯 

分 类 号：TQ426.91[化学工程]