摘要
采用水热晶化法在SiO2V2O5(TEA)2ONH4FH2O体系中合成了无铝V-β分子筛,运用XRD,IR,UVVis漫反射,TG/DTA和SEM等技术表征了样品的物理化学特性,证明样品具有BEA拓扑结构,结晶良好,且钒原子进入了分子筛骨架.探讨了反应混合物组成对V-β分子筛晶化的影响,在以H2O2为氧化剂的苯酚羟基化反应中,考察了V-β分子筛的催化氧化性能.
V-β molecular sieves through isomorphous replacement of Si by V in zeolite β were successfully synthesized via hydrothermal procedure. The synthesis conditions were as follows： the molar chemical composition of the mixture ： 60SiO2-xV2O5-y（TEA） 20-zH2O-wNH4F （ 1 ≤x ≤6, y ≥ 16, 500 ≤z≤ 800, w≥35 ）, reaction temperature 413 K, reaction time 12 d. The synthesized samples are characterized by XRD, IR, UV- Vis, TG, DTA and SEM. The results confirm that V-β molecular sieves contain a β phase of good species, and show the presence of V iron in the framework position. In the system the catalytic behavior of V-β molecular sieves in the hydroxylation of phenol with H2O2 as the oxidant was also investigated.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
2006年第3期538-542,共5页
Chemical Journal of Chinese Universities
基金
湖南省自然科学基金(批准号:04JJ40011)
吉林大学无机合成与制备化学国家重点实验室基金资助.
关键词
V-β分子筛
催化性能
苯酚
羟基化
V-β molecular sieve
Catalytic behavior
Phenol
Hydroxylation
