固体氧化物催化剂酸碱性质对1,2-丙二醇转化反应的影响  

Effects of Acid-Base Properties of Oxide Catalysts on Transformation of 1,2-Propylene Glycol

作　　者：于政锡[1,2,3] 许磊[1,2] 张新志[1,2] 刘中民[1,2] 

机构地区：[1]中国科学院大连化学物理研究所甲醇制烯烃国家工程实验室,辽宁大连116023 [2]中国科学院大连化学物理研究所大连洁净能源国家实验室,辽宁大连116023 [3]中国科学院研究生院,北京100049

出　　处：《催化学报》2010年第4期441-446,共6页

摘　　要：采用X射线衍射、热重、NH3程序升温脱附、CO2程序升温脱附等手段研究了Al2O3,MgO,CaO和KNO3改性MgO催化剂的结构和酸碱性质,并在固定床反应装置上考察了上述催化剂气相催化转化1,2-丙二醇反应性能.结果表明,催化剂表面的酸碱性对1,2-丙二醇气相转化反应的产物分布有显著影响.Al2O3催化剂上的产物以丙醛和丙酮为主;MgO催化剂上的主要产物为丙酮醇;CaO催化剂上丙酮和丙烯醇选择性相对较高;KNO3改性MgO催化剂上环氧丙烷选择性显著升高.结合不同催化剂酸碱性质及其反应结果,提出了1,2-丙二醇气相转化的6个主要反应途径,明确了各反应途径与催化剂酸碱性质的关系.The structure and surface acid-base properties of Al2O3-, CaO-, MgO-, and KNO3-modified MgO catalysts were characterized by X-ray diffraction, thermogravimetry, NH3 temperature-programmed desorption, and CO2 temperature-programmed desorption. The catalysts were applied to catalyze the gas-phase transformation of propylene glycol in a fixed-bed reactor. The results indicated that the catalytic performance of these catalysts significantly depended on the surface acid-base properties. Main products detected were propionaldehyde and acetone on Al2O3, acetol on MgO, and acetone and allyl alcohol on CaO. However, the MgO catalyst modified with KNO3 remarkably enhanced the selectivity for propylene oxide. A six-pathway reaction mechanism was proposed to describe the catalytic transformation of propylene glycol based on the acid-base properties and the reaction results of the catalysts.

关 键 词：固体酸 固体碱 氧化铝 氧化镁 氧化钙 1 2-丙二醇 环氧丙烷 

分 类 号：TM911.4[电气工程—电力电子与电力传动]