In This Issue

封面:稀土是重要的稀有元素,资源有限,稀土催化材料是稀土资源尤其是高丰度轻稀土元素(镧、铈、镨等)重要的应用领域.为了反映稀土催化研究的新进展,推进稀土催化材料的发展,本期邀请了在稀土催化研究中比较活跃的课题组撰写了16篇文章组成稀土催化专刊,其中包括2篇综述、1篇快讯和13篇论文,内容主要涉及环境催化、石油化工和能源化工催化等过程.     

In This Issue

<正>封面:Kannan教授及其合作者分析了用于质子交换膜燃料电池和碱性膜燃料电池纳米催化剂的研究现状,介绍了几种贵金属和非贵金属催化剂的合成方法,并讨论了用于原位和非原位表征这些催化材料的各种方法.见本期第458–472页.Cover:Prof.Kannan and his coworkers in their Review on pages458–472 analyzed the current status of nanocatalysts for proton exchange     

In This Issue

封面:贺泓及研究团队基于实验室对VWOTiO催化剂配方及涂覆成型技术的大量研究,在中国重汽集团建成了一条NHSCR催化剂生产线,产品满足国产重型柴油车国IV排放标准要求.见本期第1438–1445页.Cover:Prof.He and his coworkers in their Article on pages 1438–1445reported the laboratory study of catalyst formulation and washcoating technologyfor the VWOTiOsystem,and also the establishment of an NHSCR(selective catalytic reduction of NOwith NHcatalyst production line of     

In Schiefer?l

Ohne Zusammenfassung     

In der Mineral?lanalytik

Ohne Zusammenfassung     

In Beitr?gen zur Bromatometrie

Ohne Zusammenfassung     

The density and surface tension of In–Sn and Cu–In–Sn alloys

Abstract  

The density and surface tension of binary In–Sn and ternary Cu–In–Sn alloys have been measured by a sessile-drop method. Decrease of the density and of the surface tension was observed with rising temperature. With increased Sn content in the alloys, the density increased while the surface tension reduced slightly. Addition of Cu could significantly increase the density and surface tension in the Cu–In–Sn system. The surface tension of the Cu–In–Sn alloys was also calculated by means of Butler’s equation, and compared with experimental values, showing good agreement.     

Hydrogen evolution reaction on Sn, In, and Sn–In alloys in carboxylic acids

The cathodic behavior of tin, indium, and tin–indium alloys in 0.5-M solutions of oxalic, malic, and citric acids has been investigated using potentiodynamic techniques at temperature range of 30–60 °C. The results showed that the corrosion rate (I _corr) is higher at lower indium percent (0.5% In) and starts to decrease gradually as increase of the In percent up to 5% In (although it is still higher than that of pure tin and lower than that of indium at 5% In) in all examined acids. The positive shift in corrosion potential with simultaneous increase in corrosion rate can be explained on the basis of the depolarizing action of β-InSn₄ phase compared with pure tin. The negative shift in the corrosion potential with much higher corrosion rate in case of alloys IV and V (10% and 20% In, respectively) can be ascribed to the formation of γ-In₃Sn phase which leads to the increase in the anodic to cathodic area ratio. The corrosion of the two investigated metals and their alloys is affected by the formation of soluble complex species with organic acid anions. The aggressiveness of the studied metals and their alloys decreases in the following order of the organic acids employed oxalic > malic > citric acid. The observed activation energy values support that the tested electrodes exhibit higher corrosion rates in oxalic acid solution than the corresponding values in the other investigated acids. X-ray diffraction and scanning electron microscopy photographs elucidated the types of phases formed in the prepared alloys. The presence of a definite amount of indium in tin alloy improves the hardness.     

In polarographischen Untersuchungen an Dimethylglyoximl?sungen

Ohne Zusammenfassung     

In den UR-Spektren von Fumars?ureestern

Ohne Zusammenfassung     

Enantioselective Catalytic Addition of N-Acyl Radicals: In Batch and In Flow Organophotoredox α-Amination of Aldehydes

The organophotoredox catalytic enantioselective addition of N-acyl radicals to aldehydes, to afford enantioenriched N-acyl 1,2 aminoalcohols was studied. Under the best conditions, in batch, the product was isolated in up to 52 % yield and 85 % e.e., using a low cost and commercially available chiral imidazolidinone as organocatalyst. The reaction was then studied in flow, exploring different experimental setups and photoreactors. Although modest yields were obtained, the in-flow process afforded the product in higher productivities (up to 60 times higher) and improved space time yields (increased up to 113 times) compared to the batch reaction, with no loss of stereoselectivity.     

Synthesis and Antitumor Activities In Vitro of Solanesylpiperazinotriamine

Chemotherapy is one of the most important treatments of cancer, however, clinical use of conventional anticancer drugs is often limited by their side effects such as toxicity for normal tissues and multidrug resistance of tumor cells1, 2. Because of the s…     

In memory of Yurii Arkad’evich Klyachko

Chronicle

In memory of Yurii Arkad’evich Klyachko     

In memory of Boris Mikhailovich Mar’yanov

Chronicle

In memory of Boris Mikhailovich Mar’yanov     

In vitro digestibility of soybean β-conglycinin hydrolysates

The in vitro digestibility of alcalase enzymatic hydrolysates ofβ-conglycinin was studied.The results showed that the zeta potentials ofβ-conglycinin hydrolysates decreased and their electronegativity increased when digested with pepsin and trypsin.Furthermore,the content of peptides with molecular weight from 10 kDa to 20 kDa remained stable,while those with higher molecular weight(>20 kDa) decreased,and those with lower molecular weight(<10 kDa) increased.The proportion of highly hydrophobic peptides decreased in the process of the in vitro digestion,but no significant change in the surface hydropliobicity indices of digestion products was observed(P<0.05).These results indicate that theβ-congiycinin hydrolysates were degraded through in vitro digestion,but the degree of degradation was relatively low.Peptides with molecular weight from 10 kDa to 20 kDa in theβ-conglycinin hydrolysates resisted the digestion by pepsin and trypsin and they remained stable during the in vitro digestion processes.     

In einem Beitrag zur Analytik der ?thylamine

Ohne Zusammenfassung