摘要
以ＮＨ４ＶＯ３和正硅酸乙酯为原料，ＴＢＡＯＨ为模板剂，合成了高活性的钒硅分子筛ＶＳ－２。从ＦＴ－ＩＲ，ＸＲＤ测试可知，钒进入了分子筛骨架，合成的分子筛与Ｓｉｌｉｃａｌｉｔｅ－２具有相同的ＭＥＬ结构。在合成反应中，采用适当的ｎ（ＳｉＯ２）／ｎ（Ｖ２Ｏ５）比，并使溶胶充分老化，能有效地提高催化剂苯酚羟基化反应的活性；在结晶过程中添加晶种也能提高催化剂的选择性。在以Ｈ２Ｏ２为氧化剂的苯酚羟基化反应中。
HighlyactivevanadiumcontainingsilicateswithMELstructurehavebeenprepared.Therawmaterialsusedinthesynthesisweretetraethylsilicateandammoniummetavanadate,andtetrabutylammoniumhydroxidewasusedasatemplate.FTIRspectraofsamplessuggestthepresenceofVionsinframeworkpositions,andXraydiffractionpatternsofsamplesweresimilartothatofsilicalite2.Suitable n (SiO2)/ n (V2O5) ofthereactantmixtureandfullagingofsolgelduringsynthesiscaneffectivelyimprovetheactivityofcatalysts.AdditionofcrystallineseedstothesolgelcanalsoimprovetheactivityandselectivityofVS2catalystsinphenolhydroxylation.TheeffectofreactionconditionsonthediphenolyieldandH2O2efficientutilizationinphenolhydroxylationwithH2O2asoxidantandVS2ascatalysthasalsobeeninvestigated.
出处
《石油学报（石油加工）》
EI
CAS
CSCD
北大核心
1999年第2期34-38,共5页
Acta Petrolei Sinica(Petroleum Processing Section)
