摘要
通过改变催化剂制备过程中搅拌速率、分散剂(聚乙二醇)添加量等结晶条件制得不同钒磷氧(VPO)催化剂,并采用XRD、BET、化学滴定等手段进行表征,考察了催化剂的晶相结构和微观形貌等对催化性能的影响。实验结果表明,不同的搅拌速率和分散剂添加量均对催化剂的晶相结构和微观形貌产生一定影响,并且搅拌速率对钒的平均氧化态有很大影响。选择适宜的搅拌速率、添加适量的聚乙二醇(PEG)可改变催化剂的微观结构和表面形貌等,从而获得高性能的催化剂。催化反应评价结果表明,当合成反应中搅拌速率为225r/min、添加的PEG与V2O5质量比为0.10时,催化剂上正丁烷转化率可达88%,顺丁烯二酸酐选择性可达70%,收率达到61.7%。
By changing crystallization conditions of stirring speed and adding different amount of dis- persants （PEG） during catalyst preparation, a series of vanadyl pyrophosphate catalysts were prepared and characterized＇by XRD, BET and chemical titration to study the effect of crystal structure and micro- morphology on catalytic performance. Experimental results show that stirring speed and dispersant dos- age have properly effect both on crystal structure and micro-structure, and the former has a great influ- ence on the average oxidation state of vanadium as well. Appropriate choice of stirring speed and amount61.7%.
出处
《石油炼制与化工》
CAS
CSCD
北大核心
2014年第2期55-59,共5页
Petroleum Processing and Petrochemicals
基金
中国石油化工股份有限公司合同项目(411095)
关键词
钒磷氧催化剂
搅拌速率
分散剂
晶相结构
微观形貌
催化性能
顺酐
vanadyl pyrophosphate catalyst
stirring speed
dispersant
crystal structure
micro-morphology
catalytic performance
maleic anhydride
