TiO2-ZrO2 Composite Oxide as an Acid-Base Bifunctional Catalyst for Self-Condensation of Cyclopentanone
TiO2-ZrO2 Composite Oxide as an Acid-Base Bifunctional Catalyst for Self-Condensation of Cyclopentanone
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DOI：
10.1021/acs.iecr.0c03605
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发表时间：
2020-11-11
影响因子：
4.2
通讯作者：
Liu, Yuejin
中科院分区：
文献类型：
--
作者：
Wan, Jinmeng;Fu, Lin;Liu, Yuejin
采用溶胶-凝胶法和溶剂热法分别合成了TiO2-ZrO2混合氧化物TZ-SG和TZ-ST。采用x射线光电子能谱、x射线衍射、扫描电镜、透射电镜、吡啶傅里叶变换红外光谱、nh3 -程序升温解吸（TPD）、CO2-TPD、N-2吸附-解吸等温线对TiO2-ZrO2混合氧化物的理化性质进行了表征。所制备的TZ-ST结合了酸性和碱性固体催化剂的优点，是一种稳定高效的环戊酮自缩合催化剂。与TZ-SG相比，TZ-ST具有较高的比表面积和丰富的酸碱位点，在环戊酮自缩合反应中表现出更高的催化活性。除碱度外，TiO2-ZrO2的酸度对其催化环戊酮自缩合的活性也有重要影响。在催化剂与环戊酮质量比为0.2:1，反应温度为140℃，反应时间为6 h的最佳条件下，在TZ-ST上二聚体（C-10）的收率可达75.6%。
TiO2-ZrO2 mixed oxides TZ-SG and TZ-ST were synthesized by a sol-gel method and a solvothermal method, respectively. The physicochemical properties of the TiO2-ZrO2 mixed oxides were characterized by X-ray photoelectron spectroscopy, X-ray diffraction, scanning electron microscopy, transmission electron microscopy, pyridine Fourier transform infrared spectroscopy, NH3-temperature-programmed desorption (TPD), CO2-TPD, and N-2 adsorption-desorption isotherms. The prepared TZ-ST was a stable and high-efficiency catalyst that combined the advantages of acidic and basic solid catalysts for cyclopentanone self-condensation. Compared with TZ-SG, TZ-ST exhibited higher catalytic activity in cyclopentanone self-condensation because of its high specific surface area and plentiful acid-base sites. In addition to its basicity, the acidity of TiO2-ZrO2 also had an important influence on its catalytic activity for cyclopentanone self-condensation. Under optimum reaction conditions (a catalyst/cyclopentanone mass ratio of 0.2:1, a reaction temperature of 140 degrees C, and a reaction time of 6 h), the dimer (C-10) yield could reach 75.6% on TZ-ST.