甲硫醚硫醇化催化剂的研究进展

甲硫醇是合成蛋氨酸等产品的重要有机化工原料。本文主要针对近些年来国内外甲硫醚、硫化氢合成甲硫醇催化剂的研究进展,甲硫醚、硫化氢和甲硫醇三者在催化剂表面的吸附特性及可能的反应过程,以及催化剂的失活与再生等方面进行综述。福建省教育厅中青年科研基金(JAT160423);;泉州师范学院学科服务产业项目(1024-YA0201)和泉州师范学院青年预研基金(2016QBKJ01

Preparation and antioxidant activity of synthesized vanadyl （Ⅳ） trehalose and vanadyl （Ⅳ） carboxymethyl trehalose

对合成的钒氧海藻糖和钒氧羧甲基海藻糖的结构进行红外光谱分析,并利用ICP-MS测定钒的含量分别为2.9%和3.2%。同时对钒氧海藻糖和钒氧羧甲基海藻糖清除羟基自由基与DPPH自由基的能力进行研究,结果表明,钒氧海藻糖和钒氧羧甲基海藻糖清除DPPH·的能力和清除·OH的能力均比配体的清除能力有显著提高。此外,对钒氧海藻糖和钒氧羧甲基海藻糖清除羟基自由基和DPPH自由基的机理进行了讨论

Study on Microwave-assisted Preparation and Electrocatalytic Performance of Anode Catalyst for Direct Methanol Fuel Cell

直接甲醇燃料电池由于其低毒、高能量密度、环境可持续性、高能量转换效率和结构紧凑等优点受到了大量的关注。然而较低的催化性能和高成本是限制直接甲醇燃料电池商业化应用的主要挑战。因此迫切需要制备出催化活性高、成本较低的催化剂来顺应直接甲醇燃料电池的发展趋势。 为了提高催化剂性能、降低催化剂成本，本文制备了PtRu/C核壳催化剂、双壳层PtRu/TiO2催化剂和H-PtRu催化剂。采用X射线衍射（XRD）、扫描电子显微镜（SEM）、能谱分析（EDX）、透射电子显微镜（TEM）以及X射线光电子能谱（XPS）来研究催化剂的形貌、结构和组分。利用循环伏安法和计时电流法来测试催化剂的甲醇氧化电化学性能。主要...Direct methanol fuel cell (DMFC) has attracted many interests due to its low toxicity, high energy density, environmental sustainability, high energy-conversion efficiency and compact system. However, the insufficient catalytic performance and high cost issues are the main challenges that hinder the commercial application of DMFC. Thus, developing new catalysts to improve the catalytic activity an...学位：工学硕士院系专业：化学化工学院_工程硕士(化学工程)学号：2062013115147

小鱼仙草精油化学成分的GC-MS分析

福建省科委基金资助项目 (K20096);福建省自然科学基金项目;国家中医药管理局项目 (2000-J-P-40

Advances for the Ruthenium Complexes-Based Homogeneous Catalytic Hydrogenation of Oxalates to Ethylene Glycol

草酸酯加氢是重要的有机化学反应,在工业制乙二醇生产中有着重要的应用.对钌金属配合物均相催化反应的研究进行了综述.以催化反应体系为焦点,探讨了多种; 因素如温度、氢气压力、催化剂浓度、反应时间、添加剂等对底物转化率以及产物选择性的影响,并讨论了催化反应机理,其中金属-配体协同促进的H_2分子异; 裂,进而完成对底物分子中酯基依次加氢的反应机理是探讨的重点,这为新型催化剂的设计和应用提供参考.Hydrogenation of oxalates is one of the important organic reactions, which has an ultimate use for the industrial production of ethylene glycol. The studies on the ruthenium complexes-based homogeneous catalytic reaction systems are herein summarized. With the focus on the catalytic reaction systems, the important factors with significant influences on the oxalate transformation efficiency as well as the product selectivity are discussed, including temperature, H-2 pressure, catalyst concentration, reaction duration, additives, and so on. The catalytic reaction mechanisms are also discussed in detail, where the mechanism for the H-2-heterolysis promoted under the metal-ligand cooperation for the oxalate hydrogenation to ethylene glycol is enhanced. This study would be useful for designing the new catalyst applicable in industry.National Natural Science Foundation of China [21473142, 91545115,; 21473145]; Innovative Research Team of China [IRT_14R31, J1310024

Rare Earth Eu Doped PtRu/C Catalysts and Their Properties for Methanol Electrooxidation

Commercially available PtRu/C catalyst was doped with Eu by chemical reduction and sintering, resulting in PtRuEux/C catalysts with different Eu contents. The catalysts were characterized by transmission electron microscopy (TEM), energy dispersive X-ray (EDX) spectroscopy, X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). Results showed that Eu doping did not change the average size of the PtRu/C catalysts (ca 3 nm), and their surfaces were modified by both Eu metal and oxide. Cyclic voltammetry and chronoamperometry demonstrated that the activity of the PtRuEux/C catalysts was higher than that of commercial PtRu/C for methanol electrooxidation. Among the PtRuEux/C catalysts, PtRuEu0.3/C exhibited the best performance. The electrocatalytic oxidation of methanol on the catalyst was further investigated by in situ Fourier transform infrared (FTIR) spectroscopy at molecular level. Results indicated that the adsorbed species derived from the dissociative adsorption of methanol on the catalysts were linear. bonded CO (COL). Eu doping decreased the oxidation potential of COL and thus significantly enhanced the activity of the catalysts and their tolerance to CO.National Natural Science Foundation of China [20833005, 20828005]; Scientific Research Foundation, Ministry of Education ; Opening Foundation of the State Key Laboratory for Physical Chemistry of Solid Surface of Xiamen University ; Innovation Project of Guangxi Graduate Education, Chin

Decoration of Tetrahexahedral Pt Nanocrystals and Studies of Electrocatalytic Processes

具有明确表面结构的纳米晶催化剂在Pt单晶面模型催化剂(二维宏观尺度)与实际纳米催化剂(三维纳米尺度)之间架起了桥梁以跨越两者存在维度和尺度上的巨大鸿沟。相比于低指数晶面，具有低配位台阶原子的Pt高指数晶面单晶电极对有机小分子电氧化具有更高的催化活性。由{730}晶面围成的具有高台阶原子密度、开放结构的Pt二十四面体纳米晶对甲酸、乙醇表现出较好的催化活性。有机小分子电氧化是结构敏感的反应常会解离生成吸附态的CO(COads)，虽然有机小分子在铂单晶模型电催化剂上得到大量研究，但在高指数晶面纳米晶上还有待深入。 本论文以Pt二十四面体纳米晶为主要对象，通过对其表面修饰和以CO探针反应研究其表面过...In the context of electrocatalysis, nanocrystals with clear structure bridge the gap between Pt single crystal model electrodes(two dimension, Macroscale) and practical nanoelectrocatalysts(three dimension, nanoscale). Compared with the low-index facets, high-index facets perform higher catalytic activity for small organic molecule electrooxidation originated from high density of low-coordinated s...学位：理学博士院系专业：化学化工学院_物理化学(含化学物理)学号：2052011015370

Simultaneous determination of six preservatives in facial mask by high performance liquid chromatography

建立了同时测定单片式面膜中苯甲酸、山梨酸、脱氢乙酸、苯氧乙醇、氯苯甘醚和碘丙炔醇丁基氨甲酸酯6种防腐剂的高效液相色谱方法.面膜经50%(体积分数)甲醇提取,采用C18色谱柱,以甲醇和乙酸铵溶液(0.02 mol·L~(- 1))为流动相进行梯度洗脱,流速为1.0 m L·min~(- 1),柱温30℃,苯甲酸、山梨酸、氯苯甘醚、苯氧乙醇和碘丙炔醇丁基氨甲酸酯的检测波长为235 nm,脱氢乙酸的检测波长为295 nm.6种防腐剂浓度在0.5~20μg·m L~(- 1)范围内与峰面积均呈现良好的线性关系,方法的加标回收率为88.1%~105.3%,相对标准偏差为1.7%~2.8%.方法操作简便、快速,重复性好,灵敏度高,可用于面膜中6种防腐剂的测定.The high performance liquid chromatographic method was developed for the simultaneous determination of six preservatives( benzoic acid,sorbic acid,dehydro acetic,phenoxyethano,chlorphenesin,iodopropynyl butylcarbamate) in facial mask. The samples were extracted with 50%( volume fraction) methanol,and then separated on a C18 chromatographic column by gradient elution at a flow rate of 1. 0 m L · min~(- 1)with methanol- ammonium acetate solution as the mobile phase. The column temperature was 30 ℃. The wavelength of detection for benzoic acid,sorbic acid,phenoxyethano,chlorphenesin,iodopropynyl butylcarbamate was 235 nm,but for dehydroacetic acid was295 nm. In the range of 0. 5 to 20 μg·m L~(- 1)the peak area of six preservatives showed a good linear relationship,the recoveries were 88. 1% to 105. 3% with the relative standard deviations 1. 7% to2. 8%. The method is simple,rapid,accurate and sensitive,which can be used for determination of six preservatives in facial mask.福建省科技重大专项专题资助项目(2011YZ0001-1);; 福建省教育厅科技项目(JA13451