【摘要】 制备了负载型疏水性固体酸催化剂H3PW12O40/HZSM-5,并将该疏水性固体酸催化剂用于丙烯酸(简称AA)与正丁醇的酯化反应中。结果表明,硅铝摩尔比为60的HZSM-5负载质量分数为40%的H3PW12O40,180℃干燥2 h,H3PW12O40/HZSM-5催化剂的活性最高,丙烯酸转化率可达96.44%。H3PW12O40/HZSM-5催化剂循环使用4次,丙烯酸的转化率仍保持在71.98%。采用XRD、FTIR以及原位红外对催化剂的结构和酸性进行了表征,测试结果均表明H3PW12O40较好的分散于HZSM-5的表面,在催化剂表面存在Lewis酸和Brφnsted酸,且其负载型疏水性固体酸H3PW12O40/HZSM-5的酸量、催化活性和疏水性能均高于单组分H3PW12O40。更多还原

【Abstract】 A novel solid acid catalyst,H3PW12O40(HPW) supported on HZSM-5, has been prepared for use in the esterification of acrylic acid(AA) with n-butanol.The molar ratios of Si to Al in the support,HPW loading and calcination temperature were optimized.The activity of the catalyst was found to be maximized when a material with w(H3PW12O40)=40% was calcined at 180 ℃ for 2 h,with the conversion of AA being 96.44%.After being reused 4 times,the measured conversion of AA was still over 70%.The catalysts were characterized by FTIR and XRD and their acidity was measured by in situ FTIR.The results indicate that HPW was successfully supported on the HZSM-5 with a high degree of dispersion on the support surface.Bands at 1525 cm-1 and 1686 cm-1,characteristic of acid sites,were observed in the in situ FTIR spectra of HPW/HZSM-5 after adsorption of ammonia,indicating that HPW/HZSM-5 has both Lewis acid sites and Brnsted acid sites.更多还原