茶叶中茶多酚的吸附分离提取

研制了聚酰胺/硅胶负载型吸附剂并用于提取茶叶中的茶多酚。该吸附剂对茶多酚的吸附能力与硅胶的平均孔径和聚酰胺的负载量有关，硅胶平均孔径以12-13nM为宜；聚酰胺的担载量以10~20WT%效果最佳。该吸附剂对茶多酚的提取率约12%；制品纯度为85%─90%可直接用于食品加工工业

陶瓷先驱体Polyvinylsilazane-b-Polystyrene的合成及纳米陶瓷颗粒的制备

以DTBA为链转移剂,VSZ和苯乙烯为单体,通过可逆加成断裂链转移(RAFT)聚合合成了嵌段共聚物陶瓷先驱体Polyvinylsilazane-b-Polystyrene(PVSZ-b-PS)。利用DLS、TEM、AFM等技术,考察了PVSZ-b-PS在选择性溶剂DMF中自组装成胶束的行为。结果表明,胶束为核-壳结构的球形,其中PVSZ为核、PS为壳,胶束直径70～110nm。PVSZ-b-PS胶束制成的聚合物膜能完整保留胶束的球形特征,800℃热解能制得直径为30～40 nm的纳米陶瓷颗粒。XRD结果表明陶瓷颗粒是SiC结晶相

Effects of Rare Earth Oxide Additives on Cu/ZnO/CoO/Al2O3Catalyst for One-step Synthesis of Ethyl Acetate from Ethanol

研究了lA、CE、SM和Pr等稀土氧化物对乙醇一步合成乙酸乙酯的Cu/znO/COO/Al2O3催化剂的添加效果，得出只有lA2O3才起正的添加作用，其他均呈不同程度的负作用，这可能与稀土元素的价电子层构型有关。Effects of some rare earth oxide additives on Cu/ZnO/CoO/Al2O3 catalyst for one-step synthesis of ethyl acetate from ethanol were studied.It is observed that the La2O3 has the positive effect,and the Sm2O3、Pr6O11 and CeO2 have the negative effect.The effects of rare earth oxides probably relate with the structure of electron shell of rare earth element

On Tea-polyphenol Antioxygenation in Edible Oil by Paramagnetic Resonance Spectroscopy

研究了茶叶中的主要活性成分茶多酚的抗氧化作用及其机理。将不同含量的茶多酚溶液添加到经各种高温处理的食用油中，在实验的各个反应阶段分别取样用顺磁共振波谱仪进行跟踪检测。结果表明：茶多酚具有明显的消除、抑制食用油中自由基的能力，该能力随着茶多酚加入的浓度、反应时间的变化而不同。实验所获得的茶多酚抑制食用油中自由基的反应时间、浓度、温度的变化规律，为今后在食品工业上科学地利用茶多酚提供了科学依据及实验参考数据。Antioxygenation of tea_polyphenol (TP) and its mechanism were studied by paramagnetic resonance spectroscopy.The antioxidative eFFect of various amounts of TP in edible oil heated For various times was examined.The experimantal results showed that TP had obvious ability to scavenge Free radicals in edible oil, and its elimination ability increased with the TP concentration and reaction time.The necessary data were provided For the scientiFic use of TP in Food industry For the Future.厦门市自然科学基

Inhibition EFFect of Polyphenol to Free Radical

采用循环伏安法测定自制茶多酚及标准儿茶素的氧化峰电位.结果表明，前者高于后者，即后者还原能力较强.经加温强化处理的各种食用油，分别加入同量、不同量的上述两种试样；不同来源的食用油加同量的标准儿茶素，用ESr方法测试它们随温度、时间条件的改变引起自由基强度变化的规律.结果说明：茶多酚、儿茶素均有很强的自由基抑制效应，儿茶素更强（和还原能力较强相一致）.该研究对于从茶叶中提取茶多酚并用于食品工业，具有一定的理论意义和应用的参考价值.The potential of oxidation peaks of selF made polyphenols and standard catechins has been measured by cyclic voltammetry.It was Found that the potential of selF made polyphenols is high.The Free radical in various oils adding selF made polyphenols and standard catechins has been measured by ESR at various reaction time.The results indicated that standard catechins and selF made polyphenols have strong ability of inhibition to Free radical.The inhibition ability of standard catechins is stronger, which is in agreement with its stronger reducing ability .This result is of signiFicance in extracting polyphenols From tea.厦门市自然科学基金;福建永安鑫辉精细化工厂资

The Pathway For Cleavage of C O Bond of CO in Syngas Conversion to Ethanol over Rhodium Catalysts

利用程序升温表面反应─红外（TPSr-Ir）动态技术考察CO吸附物种对氢的反应性能并检验表面反应生成的中间物，结果表明线式CO对氢的反应性能高于桥式CO，即线式CO更可能是活性吸附态；表面反应生成了HCO、CH2等中间物.用键级守恒（bOC）-MOrSE势方法计算比较了CO→CH2过程中各可能基元步骤在rH（111）面上的反应活化能和反应热，结果表明CO经其部分氢化物种（如H2CO、HCOH）的氢解反应断裂C─O键在能量上最有利.根据这些实验结果，提出铑基催化剂上合成气转化反应主要按缔合式机理进行；CO的优势断键途径为先部分氢化，而后氢助断键.The main pathway For C-O bond cleavage in ethanol Formation reaction has been studied by using TPSR-IR dynamic method and Bond-Order-Conservation(BOC)-Morse potential approach.The partially hydrogenated CO species, H CO(1589 cm(-1)),and CH2 species(2933 cm(-1))are simultaneously detected by IR in CO adsorption-TPSR(in H2 Flow) dynamic process over Rh-Mn(1:1)/SiO2 catalyst,and a good correlation between the detected surFace Formyl intensity and the ethanol activity is also observed,implying that Formyl species is a key intermediate in the ethanol synthesis and that C-O bond cleavage occurs From a partially hydrogenated CO species.BOC-Morse potential approach predicts the activation energies For C-O bond cleavage on Rh(111) surFace according to dissociation mechanisms(including direct and hydrogen assisted dissociation of adsorbed CO)and association mechanisms(including direct and hydrogen assisted dissociation of partially hydrogenated CO such as H CO,H2 CO,HCOH),showing that the activation energy For hydrogen assisted dissociation of H2CO(or H COH)is the lowest.Based on the results of IR study and BOC calculation,it may be concluded that C-O bond cleavage occurs via hydrogen assisted dissociation of partially hydrogenated CO species.国家自然科学基

合成气制醇钼硫基催化剂上吸附物种的红外光谱表征

利用现场ＦＴＩＲ方法对合成气制混合醇钼硫基催化剂上吸附物种进行了表征。结果表明，在反应条件下，非负载或ＳｉＯ_２负载的碱助钼硫基催化剂上主要的ＣＯ加氢中间物种是ＨＣ＝Ｏ、ＣＨ_２、ＨＣＯＳ、Ｏ－ＣＨ_３及Ｓ－ＣＨ_３，而ＨＣＯＯ~－和ＣＯ_３~（２－）的红外指纹谱带却十分弱，难以辨识．推断了该催化体系的反应历程

SiO_2负载的磺化三苯膦铑配合物催化高碳烯氢甲酰化及反应中的氘逆同位素效应

水溶性磺化三苯膦铑配合物担载在SiO_2表面制得的负载化水溶性Wilkinson催化剂具较大的比表面积,当1-己烯、1-辛烯、1-庚烯和十一烯酸甲酯等液态高碳烯烃在这种催化剂上于固定床加压流动态反应器中连续进行氢甲酰化催化反应时,产物醛的选择性98～100%,并可在适当过量配体存在下保持较高的催化活性.在这种催化剂上分别于CO用/H_2和CO/D_2气氛下进行烯烃氢甲酰化反应,可观察到显著的氘逆同位素效应.根据分析,初步认为酰基物中间体氢解反应可能是SiO_2负载的磺化三苯膦铑配合物催化剂上高碳烯氢甲酰化的速控步骤

合成气制醇钼硫基催化剂上吸附物种的红外光谱表征

利用现场ＦＴＩＲ方法对合成气制混合醇钼硫基催化剂上吸附物种进行了表征。结果表明，在反应条件下，非负载或ＳｉＯ_２负载的碱助钼硫基催化剂上主要的ＣＯ加氢中间物种是ＨＣ＝Ｏ、ＣＨ_２、ＨＣＯＳ、Ｏ－ＣＨ_３及Ｓ－ＣＨ_３，而ＨＣＯＯ~－和ＣＯ_３~（２－）的红外指纹谱带却十分弱，难以辨识．推断了该催化体系的反应历程

Study on the mechanism for clearage of C-O bond of CO and the rate-determining step of ethanol formation

International Union of Pure and Applied Chemistry Congress(34th (1993 Beijing