焙烧温度对均四甲苯气相氧化制均苯四甲酸二酐钒钛氧化物催化剂的影响  

The effect of calcination temperature on V-Ti oxides catalysts for gas oxidation of 1,2,4,5-tetramethylbenzene to pyromellitic dianhydride

作　　者：方敏 顾龙勤 王昂 陈炳旭 Fang Min;Gu Longqin;Wang Ang;Chen Bingxu(State Key Laboratory of Green Chemical Engineering and Industrial Catalysis,Sinopec Shanghai Research Institute of Petrochemical Technology Co.,Ltd.,Shanghai 201208,China)

机构地区：[1]中石化(上海)石油化工研究院有限公司,绿色化工与工业催化全国重点实验室,上海201208

出　　处：《工业催化》2024年第7期49-53,共5页Industrial Catalysis

摘　　要：采用浸渍法经不同焙烧温度制备钒钛氧化物催化剂,以XRD、Raman和H_(2)-TPR等对催化剂物理化学性能进行表征,并在固定床装置上评价催化剂均四甲苯气相氧化反应性能。结果表明,钒钛氧化物催化剂中钒以TiO_(2)表面VO_(x)物种和晶体V_(2)O_(5)存在,焙烧温度可调变催化剂中表面VO_(x)物种和晶体V_(2)O_(5)的比例,焙烧温度越高,多聚的表面VO_(x)物种或晶体V_(2)O_(5)越多。500℃焙烧条件制备的催化剂具有合适的可还原性,弱酸位点相对较多,在均四甲苯气相氧化中性能最优,均酐质量收率可达85.8%。V-Ti oxides catalysts were prepared by impregation and calcinated at different temperature and tested in a fixed bed reactor for durene oxidation to pyromellitic dianhydride(PMDA).The physical-chemical properties of catalysts were characterized by XRD,Raman and H_(2)-TPR method.The results showed that the vanadium in the catalyst was mainly in the form of crystal V_(2)O_(5)and surface VO_(x)species on the TiO_(2).The ratio of surface VO_(x)species and crystal V_(2)O_(5)in catalyst can be influenced by calcination temperature,and the higher temperature,the more V_(2)O_(5)and polymerized VO_(x)species it was in the catalyst.The catalyst calcinated at 500℃has a highest PMDA yield of 85.8%in the reaction of durene oxidation as the reducibility was moderate and the weak acidity was more.

关 键 词：催化剂工程 钒钛氧化物催化剂 均苯四甲酸二酐 气相氧化 焙烧温度 

分 类 号：TQ426.6[化学工程] O643.36[理学—物理化学]