【摘要】 以工业级硅溶胶与正硅酸乙酯(TEOS)的混合物为硅源,通过一次原位水热晶化成功制备出钛硅分子筛TS-1,并研究了TS-1/H2O2体系对噻吩的脱除效果与再生情况。结果表明,当TEOS占硅源总量的25%时,所得TS-1分子筛样品的晶化率达到100%,晶体粒径约为4-6μm。该样品与H2O2组成的催化体系在基相浓度为0.03 mol.L-1、催化剂浓度为5 g.L-1、H2O2与基相摩尔比为4∶1的条件下,60℃恒温反应6 h,对噻吩的脱除率达到93.3%,明显优于由单一硅源制备的TS-1样品。经过两次简单加热再生后,该样品对噻吩的6 h脱除率仍可达到75%。更多还原

【Abstract】 Titanium silicalite（TS-1） molecular sieves had been successfully prepared via hydrothermal synthesis using the mixture of commertial silica sol and low-purity tetraethyl orthosilicate（TEOS） as silicon source.Also,the catalytic performance of TS-1/H₂O₂ system towards thiophene had been studied.The research suggested that samples made by mixed silicon sources containing 25% TEOS were apparently superior to those made by single silicon source.Their crystallinity reached 100% and the average crystal size was about 4⁶ μm.Besides,these samples manifested much higher catalytic activity on the efficiency of removing thiophene.The removing rate of thiophene reached 93.3% under the following conditions:base concertration=0.03 mol·L-1,catalyst concentration=5 g·L-1,H₂O₂/base=4∶1（molar ratio）,reaction temperature=60℃,reaction time=6 h,solvent=water.Moreover,the removing rate of thiophene could still achieve 75% using samples simply regenerated twice by calcining at high temperature.更多还原