Cyclic deformation of aluminium and its alloys

The formation of slip bands is the main mechanism of cyclic deformation in pure Al. Their density, orientation and heights in polycrystalline Al were investigated during cycling. Types, sizes and densities of precipitates are responsible for the mode of cyclic deformation in AlCu4 pure alloy. In technical Al alloys intermetallic phases have detrimental effects on deformation homogeneity and largely govern the fatigue mechanism of the material and especially microcrack initiation.     

含氧光敏引发体系的研究——Ⅵ.二苯酮/三乙胺体系引发光聚合过程中的再次引发效应

过去,作者曾发表了多种光敏引发体系引发烯类单体光聚合的工作,在研究2,2-二甲氧基苯乙酮在氧存在下引发甲基丙烯酸甲酯光聚合时,结合在聚合物链端的引发剂碎片具有光化学活性,在光聚合反应中产生高分子自由基,发生再次聚合,出现高分子量     

Kinetic Study of Propylene Hydrogenation over Pt/Al2O3 by Parahydrogen-Induced Polarization

Parahydrogen-induced polarization has been successfully used for a kinetic study of propylene hydrogenation over a Pt/Al₂O₃ catalyst. It was shown that the reaction orders with respect to hydrogen are different for the pairwise and the non-pairwise hydrogen addition and are equal to 0.7 and 0.1, respectively. This observation of different reaction orders confirms the coexistence of different types of active sites which are responsible for the overall and the pairwise hydrogen addition to the propylene C=C double bond. Moreover, 0.7 reaction order with respect to H₂ for pairwise hydrogen addition indicates that the contribution of pairwise addition depends on the concentration of molecular hydrogen. Therefore, this observation can be developed into a practical tool for producing fluids with highly polarized nuclear spins by changing the hydrogen concentration.     

Sulfide Catalysts for Production of Motor Fuels from Fatty Acid Triglycerides

Patents dealing with the production of motor fuel components by hydrodeoxygenation of renewable raw materials based on fatty acid triglycerides are analyzed. Various methods of using sulfide catalysts in hydrodeoxygenation of fatty acid triglycerides and of their mixtures with petroleum fractions are described. The ways to overcome problems that arise in hydrodeoxygenation, based on using sulfide catalysts differing in the active component and support composition, are considered. For example, the use of supported MoS₂ catalysts free of Co and Ni ensures the conversion of fatty acid triglycerides along the “direct hydrodeoxygenation” pathway to avoid the formation of carbon oxides and related process problems. The use of sulfide catalysts on zeolite-containing supports allows synthesis of products with improved low-temperature properties due to isomerization (or mild hydrocracking) of С₁₅–С₁₈ alkanes formed by hydrodeoxygenation of fatty acid triglycerides.

     

Catalysts Pt/(Ga)Al2O3 Obtained Using Aluminum Metal Activated with Gallium

Russian Journal of Applied Chemistry - The products of the interaction of activated aluminum with water were used as a precursor of an oxide support of catalysts. The possibility of changing the...     

Catalysts Based on High-Vanadium Solutions of Molybdovanadophosphoric Heteropolyacids: Achievements,Challenges, and Prospects

Kinetics and Catalysis - A retrospective review based on the authors’ work is devoted to homogeneous catalytic systems based on aqueous solutions of Mo–V–P heteropolyacids (HPA-x,...     

Purification and characterization of recombinant human renin for X-ray crystallization studies

Background  

The renin-angiotensin-aldosterone system (RAS) cascade is a major target for the clinical management of hypertension. Although inhibitors of various components of this cascade have been developed successfully, development of renin inhibitors has proven to be problematic. The development of these inhibitors has been hindered by poor bioavailability and complex synthesis. However, despite the challenges of designing renin inhibitors, the enzyme remains a promising target for the development of novel treatments for hypertension. X-ray crystallographic data could greatly assist the design and development of these inhibitors. Here we describe the purification and characterization of recombinant human renin for x-ray crystallization studies.     

Effect of Mechanical Treatment on the Reactivity of Copper Powder toward Acetic Acid

The mechanism of the mechanical activation of copper powder is studied by calorimetry, XPS, and X-ray diffraction. The increase in the heat of copper-acetic acid reaction caused by mechanical treatment is due to the activation of dioxygen involved in this reaction. This activation is due to the presence of suboxide oxygen with an increased electron binding energy in mechanically treated copper.__________Translated from Kinetika i Kataliz, Vol. 46, No. 4, 2005, pp. 601–608.Original Russian Text Copyright © 2005 by Poluboyarov, Lapin, Korotaeva, Prosvirin, Bukhtiyarov.     

Nanocatalysis: A bibliometric analysis

A bibliometric analysis of publications selected according to involvement of the term “nanocatalysis” from the Chemical Abstracts Plus database on the SciFinder search platform and from the Web of Science database on the Web of Knowledge platform has been carried out. The results indicate the appearance of the new subject domain “nanocatalysis,” which pertains both to nanoscience and nanotechnology and to catalysis science.