碱处理法制备Pt/ZSM-5催化剂用于肉桂醛选择加氢反应  

Pt/ZSM-5 Catalysts Prepared by Alkali Treatment for the SelectiveHydrogenation of Cinnamaldehyde

作　　者：路珊 翟帅 胡凯 王非[1] 许杰[1] 薛冰[1] LU Shan;ZHAI Shuai;HU Kai;WANG Fei;XU Jie;XUE Bing(School of Petrochemical Engineering,Changzhou University,Changzhou 213164,China)

机构地区：[1]常州大学石油化工学院,江苏常州213164

出　　处：《化学反应工程与工艺》2023年第1期29-35,共7页Chemical Reaction Engineering and Technology

基　　金：国家自然科学基金面上项目(21878027);江苏省先进催化与绿色制造协同创新中心科技创新人才支持项目(ACGM2022-10-07)。

摘　　要：负载型催化剂中贵金属的负载方法常常会影响催化剂的结构以及催化反应性能。本研究采用碱处理法制备了ZSM-5负载Pt纳米粒子催化剂,并用透射电镜(TEM)、X射线衍射(XRD)、傅里叶变换红外光谱(FTIR)、N_(2)物理吸脱附、氨气程序升温脱附(NH3-TPD)等方法对催化剂物理化学性质进行了表征,同时将肉桂醛选择加氢反应作为模型反应,考察了合成催化剂的催化性能。结果表明:对比传统浸渍法制备的Pt/ZSM-5催化剂,用碱处理制备的催化剂能够显著地提高肉桂醛的转化率,其转化频率(TOF)值明显高于传统方法制备的催化剂,并且通过改变压力和反应温度可以进一步提高其催化活性。表征结果发现:碱处理法制备的Pt/ZSM-5催化剂具有更小粒径的Pt纳米粒子和更多的表面酸性位,有利于肉桂醛在催化剂表面的吸附和活化,使其具有更高的催化活性。The preparation method of supported noble metal catalysts often affects their structure and catalytic properties.In this paper,the ZSM-5 supported Pt nanoparticle catalysts were prepared by a developed alkali treatment method.The physicochemical properties of the catalysts were characterized by transmission electron microscope(TEM),X-ray diffraction(XRD),Fourier transform infrared spectroscopy(FTIR),N_(2)sorption,temperature programmed desorption of ammonia(NH3-TPD).The selective hydrogenation of cinnamaldehyde was used to investigate their catalytic performance.The results showed that their turnover frequency(TOF)values were higher than that of the Pt/ZSM-5 catalyst prepared by the traditional impregnation method,and the catalytic activity could be further improved by changing the H2 pressure and the reaction temperature.Characterization results demonstrated that the Pt/ZSM-5 catalysts prepared by alkali treatment possessed smaller particle size of Pt nanoparticles and more surface acid sites,which facilitated the adsorption and activation of cinnamaldehyde on the surface of the catalyst and further leaded to their higher catalytic activity.

关 键 词：Pt/ZSM-5 催化剂 碱处理 肉桂醛 选择加氢 

分 类 号：O643[理学—物理化学]