磷铁摩尔比对磷酸铁结构及其催化转化2,3-丁二醇性能的影响  

Effects of P / Fe molar ratio on structure and catalytic activity of iron phosphate for 2,3-butanediol transformation

作　　者：董云海[1] 赵锦波[1] 彭钢[1] 余定华[1] 

机构地区：[1]南京工业大学生物与制药工程学院,江苏南京211800

出　　处：《南京工业大学学报（自然科学版）》2016年第4期51-57,78,共8页Journal of Nanjing Tech University(Natural Science Edition)

基　　金：国家自然科学基金(21376120)

摘　　要：通过水热合成方法制备一系列不同摩尔比的磷酸铁催化剂,测试了其催化转化2,3-丁二醇的性能。利用X线衍射(XRD)、NH_3程序升温脱附(NH_3-TPD)、H_2程序升温还原(H2-TPR)、傅里叶变换红外光谱(FT-IR)、热质量-差热分析法(TG-DTA)及N2吸附-脱附等手段表征催化剂的结构和表面性质。实验发现,低磷铁比催化剂转化2,3-丁二醇的主要产物为氧化断裂产物乙醛,而高磷铁比催化剂的主要产物则为脱水产物丁酮。表征结果表明,低磷铁比FePO_4有着更强的表面氧化还原活性和较弱的表面酸性,随着磷铁摩尔比升高,催化剂表面酸性得到增强而氧化还原性减弱。提出了一种2,3-丁二醇在酸性与氧化还原性双功能催化剂上的转化机制。A series of iron phosphate catalysts with different P / Fe molar ratios prepared with hydrothemal synthesis method were used to test the effects on 2,3-butanediol transformation. The catalyst structures and surface properties were characterized by several physico-chemical methods,including X-ray diffraction（ XRD）,NH3temperature-programmed desorption（ NH_3-TPD）,H_2 temperature-programmed reduction（ H_2-TPR）,Furier transform infrared spectroscopy（ FT-IR）,thermagravimetry-differential thermal analysis（ TG-DTA）,and N_2 adsorption-desorption. The catalysts with lower P / Fe molar ratios could catalyze the cracking reaction of 2,3-butanediol to aldehyde,while the catalysts with higher P / Fe molar ratios could catalyze the dehydration reaction of 2,3-butanediol to butanone. The characterization results showed that the catalysts with lower P / Fe ratios had stronger oxidation activity and weaker acidity,and the surface acidity of catallysts could be enhanced and the surface redox properties decreased with the increase of phosphate content. A transformation mechanism of 2,3-butanediol on solid acid and redox catalysts was proposed.

关 键 词：磷酸铁 2 3-丁二醇 脱水 断裂 脱氢 

分 类 号：TQ426.94[化学工程]