Nano-sized spinel cobalt chromite oxide CoCr2O4 and its substituted forms CoCr2−xAlxO4 (0 ≤ x 2) have been successfully synthesised by wet chemical route. The prepared powders were characterised means of thermal analysis (DTA/TGA), X-ray diffraction (XRD), Field emission scanning electron microscopy (FE-SEM), Brunauer–Emmett–Teller (BET), UV–visible techniques (UV–Vis) colorimetric analyses (L*...

Samples taken during deuteration of methyl linoleate with the title catalysts were separated into saturate, monoene and diene fractions. Monoenes were further separated into cis and trans fractions. A comparison of the double bond distribution in monoenes with those from hydrogenation of alkaliconjugated !inoleate indicated that up to 59% of the !inoleate was reduced through a conjugated interm...

II S, stearate; M, mOlloene; D, diene; T, trien€; CD, conjugated {Hene; eDT, conjugated diene-triene. Copper chl'omite 9.12.15 8.9 22.9 33,S 4,6 31.6 17 Nickel 9,12,15 0,9 40,S 21.1 0,5 20 Copper chromite 5,9,12 O,S 27.3 39.4 30,2 0,9 1.4 18 Copper chromite 3.9,12 lOJ 22.3 69,4 6,7 18 D T CD CDT Composition, % Position of double bonds in tl'ienes Analyses of Products Formed During :Hydrogenutio...

Introduction: Primitive achondrites (IAB irons/winonaites; acapulcoites/lodranites; and brachinites) have chondritic compositions, but nonchondritic textures (from metamorphic through partially melted) [1]. Because of this, they offer a unique insight into the first stages of the differentiation process on asteroids. Acapulcoites and lodranites have textural and mineralogical evidence that they...

According to the classification of the nickel laterite, this paper describes mineralogy test is to reveal where valuable elements are located in the ore, in which mineralogical form. The purpose of the sieving test was to study if some specific particle size contains most of the valuable metals. Based on its chemical composition nickel laterite is classified as a limonite type and the nickel an...

As a step towards resolving the genesis of inclusions in diamonds, a new technique is presented. This technique combines cathodoluminescence (CL) and electron backscatter diffraction (EBSD) using a focused ion beam– scanning electron microscope (FIB–SEM) instrument with the aim of determining, in detail, the three-dimensional diamond zonation adjacent to a diamond inclusion. EBSD reveals that m...

A solid reduction process is described whereby chromite is reduced with the help of calcium chloride to produce ferrochrome alloy powders with high metal recovery. The process involves segregation reduction of chromite using graphite as the reductant and calcium chloride as the segregation catalyst. Experiments were performed in the temperature range of 1200–1400 ◦C to evaluate the influences o...

nain ophiolite melange is located 140 km east of isfahan. based on the geological studies, this area belongs to mesozoic ophiolite of urumieh – dokhtar zone, west of central iran. country rocks are pridotite and serpentinized pridotite. the pridotite rocks are composed of harzburgite, lherzolite and replacement dunite which is belong to spinel pridotite facies.paragenesis of ore minerals are ch...