Catalytic Activity of Smectites on Dimerization of Oleic Acid

1992 ◽  
Vol 57 (8) ◽  
pp. 1666-1671 ◽  
Author(s):  
Blahoslav Číčel ◽  
Peter Komadel ◽  
Miloš Nigrin
Keyword(s):  
Catalytic Activity ◽  
Oleic Acid ◽  
Hydrochloric Acid ◽  
Sodium Carbonate ◽  
Iron Content ◽  
High Iron Content ◽  
Interlayer Cations ◽  
High Iron ◽  
The Relationship

A series of dimerization experiments were conducted to investigate the relationship between dimerization yield and crystallochemical composition of five smectite minerals used as catalysts. Effect of interlayer cations and acid treatement of one montmorillonite was also investigated. The maximum dimer yield was obtained with magnesium as interlayered cation. Aluminium and calcium varieties yielded lower amounts of dimers. Addition of sodium carbonate (natrification) was detrimental to dimer production. Dimer recovery was increased by the use of montmorillonite partially decomposed by hydrochloric acid. Variations in the crystallochemical composition of smectites had little effect on the amount of dimer produced. High iron content in the catalyst lowered the quality of the dimerization products.

Some observations on the relationship between etch-pit form and structure in biotite

Clay Minerals ◽  
1985 ◽  
Vol 20 (2) ◽  
pp. 263-271 ◽  
Author(s):  
J. A. Medina ◽  
M. Morante ◽  
S. Leguey ◽  
J. Tornero
Keyword(s):  
Epitaxial Growth ◽  
Iron Content ◽  
Chemical Compositions ◽  
Previous Knowledge ◽  
Structural Explanation ◽  
High Iron Content ◽  
High Iron ◽  
Etch Pit ◽  
The Relationship

The object of this study was to find a structural explanation for the corrosion figures produced in biotites having different chemical compositions and to apply this information to other di- or trioctahedral micas. The biotites investigated were used in earlier studies of epitaxial growth, so that previous knowledge of their surface behaviour was available. The biotites studied were from Evje, Norway (number 1), Guomum, Czechoslovakia (number 2), and Tanokami Yama, Japan (number 3). All were very dark in colour due to their high iron content.

scholarly journals The content of petroleum products, benzo(a)pyrene and heavy metals in soils of yamalnenets autonomous district and heavy metals in the hair of children

2019 ◽  
Vol 95 (6) ◽  
pp. 521-524
Author(s):  
Olga M. Zhurba ◽  
V. S. Rukavishnikov ◽  
A. V. Merinov ◽  
A. N. Alekseyenko
Keyword(s):  
Heavy Metals ◽  
Iron Content ◽  
Petroleum Products ◽  
Soil Samples ◽  
High Iron Content ◽  
High Iron ◽  
Autonomous District ◽  
The North ◽  
Hair Samples

The paper presents information about the content of benzo(a)pyrene in soil samples of petroleum products and the content of heavy metals (iron, copper, lead, arsenic, manganese, chromium, cadmium and mercury) in the soil and hair samples of children. Soil samples and hair were taken in October 2014 in the north-western part of the Yamal-Nenets Autonomous District. The values obtained were compared with the approximately permissible levels and maximum allowable concentrations adopted in the Russian Federation. Levels are determined compounds in the soil in general do not exceed the allowable concentrations. In hair samples there was noted marked exceeding of the recommended values for zinc, copper, chromium and iron 10%, 16.7%, 83.3% and 100% samples, respectively. The cause of the high iron content in the hair samples may be due to the quality of consumed water, which is characterized by low mineralization and high iron content. Increased chromium content of more than 80% of the hair samples can be caused, as in the case of iron, the quality of water consumed, but also a high proportion of local foods in the diet of people, rich by chromium. A conducted study on the state of the environment in the village, away from areas of hydrocarbon production, indicates to the low importance of anthropogenic impact.

ON THE PROCESSING OF HEMATITE RAW MATERIALS AT THE KRYVOROZHSK MINING AND PROCESSING PLANT OF OXIDIZED ORE ON TECHNOLOGY OF DIRECT RECOVERY ITmk3

2018 ◽  
pp. 32-37
Author(s):  
P.I. Loboda ◽  
Younes Razaz ◽  
S. Grishchenko
Keyword(s):  
Magnetic Properties ◽  
Cast Iron ◽  
Iron Content ◽  
Raw Materials ◽  
Direct Reduction ◽  
Processing Plant ◽  
High Iron Content ◽  
High Iron ◽  
Direct Restoration ◽  
First Time

Purpose. To substantiate the efficiency of processing hematite raw materials at the Krivoy Rog Mining and Processing Plant of Oxidized Ores using the direct reduction technology itmk3®. Metodology. Analysis of the results of the itmk3® direct restoration technology developed by Kobe Steel Ltd., Japan and Hares Engineering GmbX, Austria, with a view to using it to process Krivbass hematite ores into granulated iron (so-called “nuggets”). Findings. The involvement in the production of hematite ores (oxidized quartzite) of Krivbass with high iron content, but with low magnetic properties for their processing into granular cast iron is grounded. Originality. The use of itmk3® direct reduction technology from Kobe Steel Ltd., Japan and Hares Engineering GmbH, Austria for the processing of Krivbass hematite ores into granular cast iron is justified for the first time. Practical value. The efficiency of the use of hematite ores (oxidized quartzite) has been substantiated, which can significantly reduce the costs in the mining cycle for the economical production of metallurgical products.

Fabrication of bisferrocenyl derivative grafted HTPB with high iron content and its application in dopamine detection

2021 ◽  
pp. 121789
Author(s):  
Alireza Aghaiepour ◽  
Shabnam Rahimpour ◽  
Elmira Payami ◽  
Reza Mohammadi ◽  
Reza Teimuri-Mofrad
Keyword(s):  
Iron Content ◽  
High Iron Content ◽  
High Iron ◽  
Dopamine Detection

High iron content of Ankaferd hemostat as a clue for its hemostatic action of red blood cell origin

2015 ◽  
Vol 26 (2) ◽  
pp. 233-234 ◽  
Author(s):  
Nejat Akar ◽  
Yasemin Ardçoğlu ◽  
Zeki Öktem ◽  
Nuran Erduran ◽  
Ibrahim C. Haznedaroglu
Keyword(s):  
Blood Cell ◽  
Red Blood Cell ◽  
Iron Content ◽  
High Iron Content ◽  
High Iron

scholarly journals Studies on high iron content in water resources of Moradabad district (UP), India

Water Science ◽  
2017 ◽  
Vol 31 (1) ◽  
pp. 44-51 ◽  
Author(s):  
Vipin Kumar ◽  
Pawan Kumar Bharti ◽  
Meenu Talwar ◽  
Ajay K. Tyagi ◽  
Pamposh Kumar
Keyword(s):  
Water Resources ◽  
Iron Content ◽  
High Iron Content ◽  
High Iron

Ductile Fe-based amorphous alloys with high iron content

2010 ◽  
Vol 17 (2) ◽  
pp. 199-203
Author(s):  
Feng-juan Liu ◽  
Tao Zhang ◽  
Shu-jie Pang ◽  
Ke-fu Yao
Keyword(s):  
Iron Content ◽  
Amorphous Alloys ◽  
High Iron Content ◽  
High Iron

scholarly journals In Situ Control of Thermal Activation Conditions by Color for Serpentines with a High Iron Content

Materials ◽  
2021 ◽  
Vol 14 (21) ◽  
pp. 6731
Author(s):  
Tatiana K. Ivanova ◽  
Irina P. Kremenetskaya ◽  
Andrey I. Novikov ◽  
Valentin G. Semenov ◽  
Anatoly G. Nikolaev ◽  
...  
Keyword(s):  
Iron Content ◽  
Large Scale ◽  
Color Change ◽  
Reference Sample ◽  
Chemical Activity ◽  
High Iron Content ◽  
Color Palette ◽  
High Iron ◽  
Serpentine Minerals ◽  
Heat Treated

Serpentine heat treatment at temperatures of 650–750 °C yields magnesium–silicate reagent with high chemical activity. Precise and express control of roasting conditions in laboratory kilns and industrial aggregates is needed to derive thermally activated serpentines on a large scale. Color change in serpentines with a high iron content during roasting might be used to indicate the changes in chemical activity in the technological process. This study gives a scientific basis for the express control of roasting of such serpentines by comparing the colors of the obtained material and the reference sample. Serpentines with different chemical activity were studied by X-ray diffraction, Mössbauer spectroscopy, and optical spectroscopy. The color parameters were determined using RGB (red, green, blue), CIELAB (International Commission on Illumination 1976 L*a*b), and HSB (hue, brightness, saturation) color models. The color of heat-treated samples was found to be affected by changes in the crystallochemical characteristics of iron included in the structure of the serpentine minerals. The color characteristics given by the CIELAB model were in good coherence with the acid-neutralizing ability and optical spectra of heat-treated serpentines. Thus, in contrast to the long-term analysis by these methods, the control by color palette provides an express assessment of the quality of the resulting product.

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