SO_(4)^(2-)改性CrO_(x)/VO_(x)/SiO_(2)催化剂及其乙烯聚合性能  

SO_(4)^(2-)modified CrO_(x)/VO_(x)/SiO_(2)catalyst and its ethylene polymerization performance

作　　者：王俊荣 黄荣福 于连荣 郭建豪 金玉龙 WANG Jun-rong;HUANG Rong-fu;YU Lian-rong;GUO Jian-hao;JIN Yu-long(Research Institute of Liaoyang Petrochemical Company,PetroChina,Liaoyang 111003,China;College of Materials and Energy,South China Agricultural University,Guangzhou 510642,China)

机构地区：[1]中国石油辽阳石化公司研究院,辽宁辽阳111003 [2]华南农业大学材料与能源学院,广东广州510642

出　　处：《石化技术与应用》2025年第1期8-12,共5页Petrochemical Technology & Application

摘　　要：通过引入不同质量分数的固体强酸组分对CrO_(x)/VO_(x)/SiO_(2)催化剂的载体进行SO_(4)^(2-)改性,利用扫描电子显微镜、电感耦合等离子体发射光谱仪和物理吸附仪等对改性前后的催化剂进行表征,考察了不同n(Al)/n(Cr)和聚合温度对改性前后催化剂性能的影响,并对聚合产物进行了分析。结果表明:经SO_(4)^(2-)改性后,催化剂的Cr,V元素实际负载量(质量分数)与理论负载量基本一致,但S元素实际负载量偏低,只有理论负载量的30%~60%;最佳的n(Al)/n(Cr)在85~95;最佳聚合温度均为75℃;且合成的聚乙烯产品均属于双峰聚乙烯。The support of CrO_(x)/VO_(x)/SiO_(2)catalyst was modified by SO_(4)^(2-)by introducing different mass fractions of solid strong acid components.The catalysts before and after modification were characterized by scanning electron microscope,inductively coupled plasma emission spectrometer and physical adsorption instrument.The effects of different n(Al)/n(Cr)and polymerization temperature on the performance of the catalysts before and after modification were investigated,and the polymerization products were analyzed.The results showed that after SO_(4)^(2-)modification,the actual Cr and V element loadings(mass fraction)of the catalyst were basically consistent with the theoretical loading,but the actual S element loading was low,only 30%-60%of the theoretical loading.The optimum n(Al)/n(Cr)was in the range of 85-95.The optimum polymerization temperature was 75℃.The synthesized polyethylene products belonged to bimodal polyethylene.

关 键 词：双金属催化剂 CrO_(x) VO_(x) 固体强酸 SO_(4)^(2-)改性 乙烯聚合 双峰聚乙烯 

分 类 号：TQ314.242[化学工程—高聚物工业] TQ325.12