The reaction of copper stearate with triethylaluminurn (TEAL) formed a soluble catalyst that promoted the selective hydrogenation of the linolenyl groups in soybean oil. This homogeneous catalyst was more active than copper-chromite. The activity was enhanced by the addition of silica, alumina or titania. Ethyl alcohol accelerated the hydrogenation when it was added in small amounts and retarde...

objective: in order to evaluate the endometrium by ultrasound in patients undergoing controlled ovarian hyperstimulation (coh) with clomiphene citrate (cc) and human menopausal gonadotropin (hmg) with intrauterine insemination (iui) to determine the relationship between endometrial pattern and thickness on pregnancy rate (pr). methods: in this prospective study, 108 infertile couples underwent ...

Synthesize carbon-based metal-free catalysts and • carbon-composite catalysts for oxygen reduction reaction (ORR). Optimize catalytic active reaction sites as a function • of carbon support, surface oxygen groups, nitrogen content, surface modifiers, pyrolysis temperature, porosity, and the concentration of the non-metallic additive “X” in the catalyst matrix. Evaluate catalyst stability under ...

An efficient method for the synthesis of heterogeneous gold catalysts has been developed. These catalysts were easily assembled from readily available silica materials and gold complexes. The heterogeneous catalysts exhibited superior reactivity in various reactions where protodeauration is the rate-limiting step. Dramatic enhancement in regio- and enantioselectivity was observed when compared ...

● Deactivation of Diesel Catalyst Abstract: The first diesel catalysts, introduced in 1970s for underground mining applications, were simple oxidation catalysts designed for conversion of CO and HC. These catalysts gradually evolved into the modern diesel oxidation catalysts, optimized for PM emission reduction. Future requirements for NOx emission reduction from diesel engines call for new cat...

Some of the most active catalysts for carbon dioxide and epoxide copolymerization are dinuclear metal complexes. Whilst efficient homodinuclear catalysts are known, until now heterodinuclear catalysts remain unreported. Here, a facile, in situ route to a catalyst system comprising a mixture of homo- and heteronuclear Zn-Mg complexes is presented. This catalyst system shows excellent polymerizat...

Basic characteristics of heteropolyacids as green catalysts are overviewed, focusing on the various reaction fields in which the heteropolyacid catalysts function as acid and oxidation catalysts, and then two industrial processes which were made very green by the use of heteropolyacid catalysts in liquid biphase systems are described. In this context an interesting new reaction field formed at ...

Off recent, there has been an increased interest in reducing computing processors powers and improve system throughout. This has led to the design and redesign of multicore processors that have been rolled out to meet the ever increasing computational problems. Complex problems have emerged in the IT and ICT world which have led to the evolution of traditional computing environments in order to...

Numerous studies have been carried out to determine the effect of various types of bone transplants on the healing pattern of experimentally produced defects in animals (Maatz, Lentz and Graf 1954; Burwell 1963; Heipel, Chase and Herndon 1963; Melcher and Irving 1963; Buring and Urist 1967; Raina 1968). These have repeatedly shown that autogenous bone grafts are better than homogenous and heter...

in this paper, labo3 perovskite type catalyst formulations were prepared by sol-gel auto combustion method using citric acid as the fuel. activity of catalysts was tested in catalytic oxidation of toluene as a model of volatile organic compounds. lacoo3 perovskite formulation showed the highest activity among labo3 (fe, mn and co) perovskite catalysts. so, lacoo3 perovskite based catalyst was s...