无机盐工业
主管:中海油天津化工研究设计院有限公司
主办:中海油天津化工研究设计院有限公司
   中海油炼油化工科学研究院(北京)有限公司
   中国化工学会无机酸碱盐专业委员会
ISSN 1006-4990 CN 12-1069/TQ

无机盐工业 ›› 2024, Vol. 56 ›› Issue (11): 165-174.doi: 10.19964/j.issn.1006-4990.2024-0114

• 催化材料 • 上一篇    

Cs/SiO2-ZrO2催化丙酸甲酯与甲醛缩合反应性能研究

杜海岗1,2(), 王兴永3, 孙培永1,2, 陈和3, 傅送保3, 姚志龙1,2()   

  1. 1.北京石油化工学院新材料与化工学院,北京 102617
    2.恩泽生物质精细化工北京市重点实验室,北京 102617
    3.中海油化工与新材料科学研究院(北京)有限公司,北京 102209
  • 收稿日期:2024-03-01 出版日期:2024-11-10 发布日期:2024-11-27
  • 通讯作者: 姚志龙(1971— ),男,博士,研究员,硕士生导师,研究方向为工业催化;E-mail:yaozl@bipt.edu.cn
  • 作者简介:杜海岗(1998— ),男,硕士生,研究方向为工业催化;E-mail:Mrdu000@163.com
  • 基金资助:
    北京市教育委员会科技计划项目(KM201910017010)

Study on condensation performance between methyl propionate and formaldehyde catalyzed by Cs/SiO2-ZrO2

DU Haigang1,2(), WANG Xingyong3, SUN Peiyong1,2, CHEN He3, FU Songbao3, YAO Zhilong1,2()   

  1. 1.College of New Materials and Chemical Engineering,Beijing Institute of Petrochemical Technology,Beijing 102617,China
    2.Beijing Key Laboratory of Enze Biomass Fine Chemical,Beijing 102617,China
    3.CNOOC Research;Institute of Chemical Engineering and New Materials,Beijing 102209,China
  • Received:2024-03-01 Published:2024-11-10 Online:2024-11-27

摘要:

丙酸甲酯与甲醛缩合制备甲基丙烯酸甲酯(Methyl Methacrylate,简称MMA)是目前较清洁的工艺路线,其关键在于高性能催化剂的开发。采用共沉淀法和初湿浸渍法制备了SiO2-ZrO2复合氧化物和Cs/SiO2-ZrO2催化剂,通过XRD、Raman、ICP-OES、BET、NH3-TPD和CO2-TPD等手段对其理化性质进行了表征,并将其与催化丙酸甲酯和甲醛的缩合反应的性能进行关联,研究载体表面酸碱性对Cs/SiO2-ZrO2催化剂缩合反应活性的影响。结果表明:SiO2质量分数的增大有利于促进SiO2-ZrO2复合氧化物中m-ZrO2t-ZrO2的转变以及t-ZrO2晶型的稳定;引入Cs2CO3可使其结构和表面酸碱性位点分布发生改变。催化剂表面弱碱性位点是适宜的活性中心,具有较高催化活性的催化剂表面弱碱性和总碱性位点数量存在一个最优区间,其中中强碱位点的降低和酸性位点的消除有利于催化活性的提高;在0.2 MPa、370 ℃和质量空速为1.0 h-1的条件下,质量分数为60%的SiO2和质量分数为10%的Cs2CO3组成的10Cs/60SiO2-40ZrO2催化剂具有最佳催化性能,对丙酸甲酯的转化率和目标产物甲基丙烯酸甲酯的选择性分别可达30.77%和97.89%。

关键词: 甲基丙烯酸甲酯, 羟醛缩合, 复合氧化物, SiO2-ZrO2, 丙酸甲酯

Abstract:

The preparation of Methyl Methacrylate(MMA) by condensation of methyl propionate with formaldehyde hydroxyl aldehyde is currently the cleanest process route,and the key lies in the development of high-performance catalysts.A series of SiO2-ZrO2 composite oxides were prepared by coprecipitation and employed as carrier to load Cs2CO3 with an incipient wetness impregnation method.The physiochemical properties of the obtained SiO2-ZrO2 composite oxides and Cs/SiO2-ZrO2 catalysts were characterized by multiple techniques including XRD,Raman,ICP-OES,BET,NH3-TPD and CO2-TPD,and correlated to their performances in the condensation reaction of methyl propionate with formaldehyde.Special attention had been paid to the influence of carrier surface acidity and alkalinity on the activity of Cs/SiO2-ZrO2 catalysts towards the condensation reaction.The results indicated a transformation of zirconia from m-ZrO2 to t-ZrO2 with increasing the SiO2 content,suggesting t-ZrO2 was more stable in the SiO2-ZrO2 composites with higher SiO2 contents.Introduction of Cs2CO3 onto SiO2-ZrO2 composites changed greatly the distribution of surface acid-base sites,as well as the catalyst structure.The weakly basic sites on the catalyst surface were suitable active centers,and there existed an optimal interval between the number of weakly basic and total basic sites on the surface of catalysts with high catalytic activity,in which the reduction of medium-strongly basic sites and the elimination of acidic sites were favourable to the increase of catalytic activity.The 10Cs/60SiO2-40ZrO2 catalyst with 60% SiO2 and 10% Cs2CO3 exhibited the best catalytic performances,yielding the conversion of methyl propionate and the selectivity of methyl methacrylate(MMA) up to 30.77% and 97.89%,respectively,under the optimal reaction conditions of 370 ℃,0.2 MPa,and a space velocity of 1.0 h-1.

Key words: methyl methacrylate, aldol condensation, composite oxides, SiO2-ZrO2, methyl propionate

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