膨润土/沸石制备猫砂实验研究

本文利用X射线(衍)射、SEM及化学分析等方法,研究了北票膨润土及沸石特性.通过实验研究,找出了沸石改性较好的试验条件,确定了膨润土与沸石的最佳配比,制备的猫砂产品比国内猫砂性能好,接近国外进口猫砂的性能指标.     

HY分子筛上苯甲醚酰化反应及动力学研究

在微型固定床反应器中以HY分子筛为催化剂,研究了苯甲醚和乙酸酐的酰化反应,得出最佳工艺条件为:反应温度110℃,苯甲醚和乙酸酐的摩尔比为5:1,反应物空速11.3h-1,催化剂粒径0.059～0.042mm,产物最高收率可达83.7％.同时研究了苯甲醚乙酰化反应初始阶段的动力学,结果表明,此阶段为准一级反应,反应速率常...     

Effects of TS-1 zeolite structures on physical properties and enzymatic degradation of Poly (butylene succinate) (PBS)/TS-1 zeolite hybrid composites

The objective of this study was to investigate how the water uptake features and carrier characteristics of the TS-1 zeolite affected the physical and rheological properties, morphological parameters, and enzymatic hydrolysis of Poly (butylene succinate) (PBS). The introduction of TS-1 zeolite as catalyst was developed for the preparation of PBS/TS-1 zeolite hybrid composites (PTHC) without heavy metal toxic substance in the context on clean technology. The TS-1 zeolite can act as a catalyst as well as a reinforcement filler with the result that PTHC can show marked increases in tensile properties and elongation at breakage in the solid state. The rheological properties of PTHC with high zeolite contents showed low values of complex viscosity, as compared with PTHC with low TS-1 zeolite contents, due to the volatilization of water released from the zeolite pores during esterification. The introduction of the TS-1 zeolite in the PBS matrix was not significantly affected by changes in the size of the long period, lamella thickness, or the amorphous region, indicating that PBS chains do not penetrate into zeolite pores, as confirmed by SAXS profiles. In enzymatic hydrolysis over 90 days, the enzymatic hydrolysis rates of PTHC significantly accelerated with increasing TS-1 zeolite contents, compared with Homo PBS. This result indicated that TS-1 zeolite can act as a carrier for enzyme activation, resulting in enzymatic hydrolysis, occurring from the amorphous area on the surface into the inside of the film.     

改性沸石去除中低放废水中痕量放射性核素的研究

研究了天然沸石的改性及其去除模拟中低放废水中痕量放射性核素的性能.将预处理好的天然沸石在浓度为0.25 mol/L的NaCl溶液中浸泡并在25℃、转速为200 r/min下恒温振荡24h,洗净烘干后得到钠型改性沸石.研究了吸附时间、溶液pH、沸石投加量和竞争离子对沸石吸附Co2+的影响,得到了最佳吸附条件:Co2+起始...     

粉煤灰微波合成沸石在水处理中的应用

以粉煤灰为原料采用微波水热合成法制备沸石,将其用于废水处理中,考察了粉煤灰合成沸石对氨氮、磷、Fe2+、Mn2+、Cu2+的去除效果.实验结果表明,与粉煤灰相比,粉煤灰合成沸石具有更高的氨氮、磷去除率;在吸附去除废水中的Fe2+、Mn2+、Cu2+时,合成沸石比天然沸石更有效.     

酸改性沸石去除高浓度甲醛废水的研究

用盐酸对天然沸石进行改性得到酸改性沸石,通过静态吸附实验研究了酸改性沸石对废水中甲醛的吸附性能。研究表明在293 K时,酸改性沸石对甲醛的平衡吸附量为255 mg/g,最佳吸附pH值为6.5,吸附平衡时间为2 h。     

α-异佛尔酮异构化反应研究

以α-异佛尔酮为原料,4A分子筛为催化剂,通过异构化反应制备β-异佛尔酮,考察了温度和催化剂用量对反应的影响,并对反应进行了热力学研究.实验结果表明:该反应的最佳反应温度为210℃,催化剂用量为反应原料的10％,反应时间为6h.a-异佛尔酮异构化生成β-异佛尔酮反应的焓变为55.4 kJ/mol.     

沸石去除废水中铅离子的研究

沸石是一种天然、有效、廉价的吸附材料,对铅离子有很强的选择吸附性,在废水处理中具有很好的应用前景。文章主要探讨沸石去除废水中铅离子的机理、影响因素及沸石的改性。     

ZSM-22分子筛的快速合成及表征

采用动态水热晶化法,通过加入结构导向剂,在较短的时间内成功合成出结晶度良好的ZSM-22分子筛。结果表明,结构导向剂能够明显影响分子筛的合成过程,尤其是能够大幅度缩短晶化时间,与常规方法相比,晶化时间由36 h缩短到20 h。采用XRD、SEM、TG-DTA技术,对合成的ZSM-22分子筛表征,并考察了一些参数对合成过程的影响。     

Microwave catalytic NOx and SO2 removal using FeCu/zeolite as catalyst

Non-thermal plasma technology is a promising process for flue gas treatment. Microwave catalytic NO_x and SO₂ removal simultaneously has been investigated using FeCu/zeolite as catalyst. The experimental results showed that a microwave reactor with FeCu/zeolite only could be used to microwave catalytic oxidative 91.7% NO_x to nitrates and 79.6% SO₂ to sulfate; the reaction efficiencies of microwave catalytic reduction of NO_x and SO₂ in a microwave reactor with FeCu/zeolite and ammonium bicarbonate (NH₄HCO₃) as a reducing agent could be up to 95.8% and 93.4% respectively. Microwave irradiation accentuates catalytic reduction of SO₂ and NO_x treatment, and microwave addition can increases SO₂ removal efficiency from 14.5% to 18.7%, and NO_x removal efficiency from 13.4% to 18.7%, separately. FeCu/zeolite catalyst was characterized by X-ray diffraction (XRD), X-ray photoelectron spectrum analysis (XPS), scanning electron microscopy (SEM) and the Brunauer Emmett Teller (BET) method. Microwave catalytic NO_x and SO₂ removal follows Langmuir-Hinshelwood (L-H) kinetics.