酸性溶液中β-苯胺基苯丙酮在铁上的吸脱附行为

用极化曲线法研究了０．５ｍｏｌ·Ｌ－１硫酸溶液中β－苯胺基苯丙酮（ＰＡＰ）在铁－溶液界面的吸脱附行为及Ｃｌ－,Ｉ－的影响．结果表明,ＰＡＰ的吸附遵循Ｆｌｏｒｙ－Ｈｕｇｇｎｓ等温式;在较正的极化电位区出现阳极脱附现象．讨论了两种粒子联合吸附方式与浓度的关系,提出可根据吸附粒子的脱附电位与其浓度关系来推断联合吸附的理论模型     

CH3（ad）在清洁及预吸附氧Pd（100）表面的热脱附性能

用高分辨电子能量损失谱，热脱附谱，紫外光电子能谱研究了ＣＨ３在清洁及预吸附氧Ｐｄ表面上的热稳定性。ＣＨ３由ＣＨ３Ｉ在Ｐｄ表面的热分解来产生。ＣＨ３Ｉ的ＨＲＥＥＬＳ表明，ＣＨ３中的Ｃ－Ｈ键近似与表面平行，ＣＨ３Ｉ在Ｐｄ表面低于１１０Ｋ时已裂解为ＣＨ３和Ｉ，大量的ＣＨ３在２００－２１０Ｋ的温度范围内的Ｈ结合并以ＣＨ４的形式脱附，但在氧改性表面，ＣＨ４脱附的温度范围变宽，脱附温度有所提高，可能是由于表面     

吸附态物种表面迁移对程序升温脱附的影响

利用ＭｏｎｔｅＣａｒｌｏ（ＭＣ）方法研究了吸附态物种表面迁移对程序升温脱附谱图的影响。在ＭＣ模型中，催化型表面用一个二维的二方格网张表示，网络格点表示吸附活性位。     

MgO上甲醇分解的TPSR研究

本文采用ＴＰＳＲ－ＭＳ技术考察ＣＨ＿３ＯＨ在Ｍｇｏ催化剂上的分解反应，并与ＭｇＯ固体碱催化剂表面的酸碱性质进行关联。发现ＣＨ＿３ＯＨ在２３８℃、３４２℃和５３３℃处有三个脱附峰，对应地有三种表面吸附形式。这三种吸附形式与催化剂表面的酸、碱中心的强度有关，弱的酸碱中心上，ＣＨ＿３ＯＨ以分子和弱吸附的表面甲氧基形式吸附，２３８℃时的脱附峰主要为甲醇和二甲醚；较强的酸碱中心上表面甲氧基吸附较牢固，于３４２℃脱附，产生的二甲醚的相对量亦多；强酸强碱中心上吸附的甲醇易脱氢而形成表面吸附的（Ｈ＿２ＣＯ），高温５３３℃脱附时分解成ＣＯ和Ｈ＿２。     

CO2部分氧化乙烷制乙烯Pd—Cu／MoO3—SiO2催化剂的研究

用化学吸附－红外光谱、化学吸附－程序升温脱附（ＴＰＤ）和微型反应技术研究了Ｐｄ－Ｃｕ／ＭｏＯ３－ＳｉＯ２（ＭｏＳＯ）催化剂对ＣＯ２和乙烷的吸附活化和部分氧化反应性能．结果表明，乙烷以Ｃ—Ｈ键中的Ｈ吸附于ＭｏＳＯ载体表面ＭｏＯ键的端基氧上；Ｐｄ－Ｃｕ／ＭｏＳＯ催化剂对ＣＯ２有良好的化学吸附活化性能，ＣＯ２的吸附除有线式吸附态和剪式吸附态外，还有一种新的卧式吸附态；Ｐｄ－Ｃｕ／ＭｏＳＯ催化剂的晶格氧参与了化学反应．探讨了在Ｐｄ－Ｃｕ／ＭｏＳＯ催化剂上ＣＯ２的部分氧化乙烷反应机理     

NO在Cu－ZSM－5分子筛上程序升温脱附研究

本文用等温动态吸附和程序升温脱附技术研究了ＮＯ与Ｃｕ－ＺＳＭ－５的相互作用，并根据还原预处理样品上ＮＯ吸、脱附循环的研究探讨了全过程样品所经历的氧化还原循环，在２５℃等温吸附时，ＮＯ与Ｃｕ￣＋和／或Ｃｕ￣０反应产生了Ｎ＿２、Ｎ＿２Ｏ和Ｃｕ￣（２＋）以及超晶格氧，同时在Ｃｕ￣＋上有许多可逆吸附的ＮＯ．ＮＯ吸附在Ｃｕ￣（２＋）上是稳定的，升高温度时，ＮＯ分为三种状态脱附，分别位于约１００，１８０和４００℃．后两种可能以Ｃｕ￣（２＋）－ＮＯ＿２和Ｃｕ￣（２＋）－ＮＯ＿３为中间态．第三种ＮＯ脱附同时伴随着Ｏ＿２脱附，对于还原预处理的样品，吸附和脱附的一个循环总体上会使样品部分氧化。     

甲烷在特制活性炭上吸附性能

用不同的原料制得了多种高比表面的活性炭吸附剂．用标准容积法测得高压下（０～５０ＭＰａ）不同活性炭对甲烷的吸脱附等温线,得到了吸附容量和有效吸附容量．研究了温度对吸附等温线的影响．利用ＣｌａｕｓｉｕｓＣｌａｐｅｙｒｏｎ方程解析了甲烷在活性炭上的等量吸附热．结果表明,活性炭对甲烷的吸脱附存在着滞后现象,活性炭的比表面和堆密度是活性炭吸附性能的主要指标,找到了最佳甲烷吸附剂．     

NO在Cu—ZSM—5分子筛上程序升温脱附研究

本文用等温动态吸附和程序升温脱附技术研究了ＮＯ与Ｃｕ－ＺＳＭ－５的相互作用，并根据还原预处理样品上ＮＯ吸、脱附循环的研究探讨了全过程样品所经历的氧化还原循环。在２５℃等温吸附时，ＮＯ与Ｃｕ＾＋和／或Ｃｕ＾０反应产生了Ｎ２、Ｎ２Ｏ和Ｃｕ＾２＋以及超晶格氧，同时在Ｃｕ＾＋上有许多可逆吸附的ＮＯ．ＮＯ吸附在Ｃｕ＾２＋上是稳定的。升高温度时，ＮＯ分为三种状态脱附，分别位于约１００，１８０和４００℃。后两种     

氧化铈对Pd／Al2O3表面上CO氧化性能的影响

采用ＴＰＤ－ＭＳ及ＴＰＳＲ－ＭＳ技术研究了添加ＣｅＯ２对Ｐｄ／Ａｌ２Ｏ３催化剂上ＣＯ脱附、表面反应及表面氧脱附等性能的影响，考察了不同含氧量的气氛下ＣＯ的氧化活性，结果表明，Ｐｄ－Ｃｅ间的相互作用有利于各自原子上表面氧的吸脱附及ＣＯ的表面反应，并发现ＣＯ２脱附量大小及峰温次序与对ＣＯ的催化氧化活性有一致的对应关系。     

界面缓蚀剂的吸附稳定性

研究表明：在一定条件下,阳极脱附电位可作为评价缓蚀剂吸附稳定性的一个经验参数：缓蚀剂吸脱附诱导的电化学振荡是缓蚀体系的一种特殊失稳状态,即缓蚀剂吸附过程与电极反应中间吸附态产物耦合的结果;卤素离子的协同作用不仅可以提高某些有机缓蚀剂的吸附复盖度,而且可以增强其吸附稳定性;微分极化曲线是研究吸附稳定性的有效方法。     

Studies of protection of iron corrosion by rosin imidazoline self‐assembled monolayers

A type of rosin imidazoline (IM) has been synthesized using rosin acid and diethylenetriamine (DETA) as raw materials. The monolayers of IM were assembled on the surface of iron. The monolayers of the IM inhibitor were characterized by electrochemical impedance spectroscopy (EIS), electrochemical polarization curves and double‐layer capacitance. Surface analysis was carried out to establish the mechanism of corrosion inhibition of iron by X‐ray photoelectron spectroscopy (XPS) and scanning electron microscopy. The IM inhibitor showed good inhibition efficiency for iron in 0.1 M H₂SO₄. The inhibition mechanism of IM inhibitor was interpreted using molecular simulation. Copyright © 2006 John Wiley & Sons, Ltd.     

Studies of Self-assembled Monolayers Formed by Imidazoline on Iron Surface by SEM and SECM

Self-assembled monolayers (SAMs) formed from organic substances can improve the inhibition of metal corrosion, because uniform and closely packed films formed on the metal surface providing an insulating layer1, 2. SAMs on the iron surface are studied so far because iron is one active metal which is easily corroded in the air. In this paper, SECM and SEM have successfully been applied in the study of SAMs inhibition corrosion for iron. SECM has been used to study the electrochemically a…     

红茶提取液在盐酸中对碳钢的缓蚀作用

采用动电位极化曲线和交流阻抗（EIS）研究了红茶提取液（BLE）在盐酸介质中对碳钢的缓蚀性能和缓蚀机理。 研究结果表明,采用索氏提取法从红茶茶叶中提取的缓蚀剂,对碳钢在1.0 mol/L盐酸溶液中具有良好的缓蚀性能,随着提取物浓度的增加,缓蚀效率增大。 红茶提取液中的有效缓蚀成分为抑制阴阳极反应的混合型缓蚀剂,在碳钢表面的吸附符合Langmuir等温式,属于单分子层吸附。     

缓蚀膜电化学行为与微观粘附力特征

采用传统电化学测试技术及原子力显微镜(AFM)力曲线分析法对十二烷基硫醇/金电极以及十二烷基磺酸钠(SDS)/铝电极表面缓蚀吸附膜的吸附行为进行了研究. 结果表明, 随缓蚀剂浓度改变, 电极电化学行为与缓蚀膜的微观粘附力特征呈现出关联性的变化趋势, 表明AFM力曲线技术可成功应用于缓蚀膜吸附行为的研究.     

Employing electrochemical frequency modulation for studying corrosion and corrosion inhibition of copper in sodium chloride solutions

The inhibition effect of 2-carboxymethylthio-4-(p-methoxyphenyl)-6-oxo-1,6-dihy-dropyrimidine-5-carbonitrile (CPD) towards the corrosion of copper was studied in aerated stagnant 3.5% NaCl at 25 °C using ac techniques include electrochemical frequency modulation and electrochemical impedance spectroscopy as well as potentiodynamic polarization measurements. Corrosion rates determined using electrochemical frequency modulation (EFM) which measures the non-linear behaviour of a corroding system are compared with corrosion rates obtained from traditional electrochemical techniques and show good agreement. Data obtained from EIS were analyzed to model the corrosion inhibition process through equivalent circuit. Polarization measurements showed that CPD acts as mixed-type inhibitor. The inhibition efficiency increases with an increase in the concentration of CPD. The adsorption of the inhibitor on the copper surface in the sodium chloride solution was found to obey Langmuir’s adsorption isotherm. A mixed inhibition mechanism is proposed for the inhibitive effects of CPD as revealed by potentiodynamic polarization technique.     

Assessment of inhibitory behavior of ethyl 5-cyano-4-(furan-2-yl)-2-methyl-6-oxo-1,4,5,6-tetrahydropyridine-3-carboxylate as a corrosion inhibitor for carbon steel in molar HCl: Theoretical approaches and experimental investigation

The new ethyl 5-cyano-4-(furan-2-yl)-2-methyl-6-oxo-1,4,5,6-tetrahydropyridine-3-carboxylate (THP) has been studied to prevent the electrochemical decomposition of carbon steel in an acidic medium used in the production process using electrochemical techniques (potentiodynamic polarization and electrochemical impedance spectroscopy), weight reduction methods and surface morphological. Computational correlations (DFT and molecular dynamics simulations) were carried out to have more information on the mechanism of inhibition. Experimentally obtained results revealed that the inhibition efficiency increases with the concentration, and the highest effectiveness is reached for 10^?3M, with 95.22%, and the compound is classified as a mixed inhibitor. Indeed, the increase in temperature caused an increase in the values of i_corr throughout the studied temperature range. Moreover, the obtained results showed that the adsorption on carbon steel is accomplished according to the Langmuir adsorption model and the adsorption parameters reflect that the THP is spontaneously adsorbed by physical adsorption, which increases the barrier energy required for the corrosion reaction. The theoretical approaches used show that THP suggests a perfect adsorption by all its chemical structure.     

碱性介质中POTAS和PDTAS对铜的缓蚀作用

合成了两种吡唑啉酮衍生物POTAS 和PDTAS, 并采用失重法和电化学方法研究了这两种吡唑啉酮衍生物对铜在5%(w)NaHCO3水溶液中的缓蚀性能和吸附行为. 结果表明, 在5%NaHCO3水溶液中这两种化合物对铜均有较好的缓蚀作用, 缓蚀效率大小顺序为POTAS>PDTAS. 并且POTAS与PDTAS均为混合型缓蚀剂. 两种化合物在铜表面的吸附均为单层吸附, 属于物理吸附.     

Accurate and rapid estimation of adsorption isotherms in liquid chromatography using the inverse method on plateaus

The inverse method (IM) is an attractive approach for estimating adsorption isotherm parameters in liquid chromatography (LC), mainly due to its experimental simplicity and low sample consumption. This article presents a new experimental approach, the inverse method on plateaus (IMP), which uses elution profiles on concentration plateaus together with IM. This approach enabled us to obtain very accurate adsorption isotherms that agreed well with those estimated by means of frontal analysis over the entire concentration range under consideration. IMP is recommended when accurate adsorption isotherm estimates are required, and standard IM is insufficient.     

碱性介质中BIT,BIOHT和BIMMT对铜的缓蚀性能和吸附行为

采用失重法和电化学方法研究了BIT, BIOHT和BIMMT三种席夫碱基四唑类化合物对铜在质量分数为5%的NaHCO3水溶液中的缓蚀性能和吸附行为. 结果表明, 在NaHCO3水溶液中三种化合物对铜均有较好的缓蚀作用, 三种化合物的缓蚀性能大小顺序为BIMMT>BIOHT>BIT. 三种化合物在铜表面上的吸附过程为放热过程, 其在铜表面上的吸附行为服从Langmuir吸附等温式, 属于物理吸附.     

Corrosion inhibition performance of 1,3,5-triazinyl urea derivatives as a corrosion inhibitor for mild steel in 1?N HCL

The inhibition effect of 1,3,5-triazinyl urea derivatives, viz. 1-(4-cyclohexyl amino)-6-(3,4-dimethoxy phenyl ethyl amino)-1,3,5-triazin-2-yl)-3-p-tolyurea (4-CADT) and 1-(4-chlorophenyl)-3-(4-(cyclohexyl amino)-6-(3,4-dimethoxy phenyl ethyl amino)-1,3,5-triazin-2-yl) urea (4-CCADT), were evaluated against mild steel (MS) corrosion in 1 N HCl solutions using conventional weight loss, potentiodynamic polarization, linear polarization, electrochemical impedance spectroscopy, and scanning electron microscopic studies. The losses in weights of MS samples have proved that both were efficient corrosion inhibitors. The mixed mode of inhibition was confirmed by electrochemical polarizations and the results of electrochemical impedance spectroscopy have shown the changes in the impedance parameters like charge transfer resistance and double-layer capacitance to confirm the strong adsorption on the MS surface inhibition of MS. The changes in concentrations of the inhibitors were due to the adsorption of the molecules evaluated leading to the formation of a protective layer on the surface of MS. The inhibition action of these compounds was assumed to occur via adsorption on the steel surface through the active centers contained in the molecules.