scholarly journals Characterization of mica from bodonchiin gol deposit (Mongolia)

2019 ◽  
pp. 23-27
Author(s):  
Zolzaya Ts ◽  
Oyun-Erdene G ◽  
Temuujin J
Keyword(s):  
Chemical Composition ◽  
Aluminum Oxide ◽  
Silicon Dioxide ◽  
Specific Surface ◽  
Research Work ◽  
Acid Leaching ◽  
Potassium Oxide ◽  
X Ray ◽  
Surface Areas ◽  
Leaching Condition

Although there are many mica deposits in Mongolia, there is no substantial study of the composition of the mica and the chemical composition and on their utilization. In this work, we characterized the minerals composition of two different samples which was located on the surface (mica-1) and in 10 m depth from the surface (mica-2) of the Bodonchin river deposit from Altai sum, Khovd province (Mongolia). The main objective of this research work was to prepare nanoporous materials from clay minerals by a different acid leaching condition. In order to evaluate the leaching characteristics, the chemical composition, mineral composition, bonding characteristics and specific surface area of mica samples were determined by X-ray fluorescence, X-ray diffractometer, FTIR and BET method, respectively. The main chemical composition of mica sample-1 consists of silicon dioxide 45.68%, and aluminum oxide 31.22%, potassium oxide 10.51% while mica sample-2 contains silicon dioxide 45.2%, and aluminum oxide 38.5%, potassium oxide 10.31%, respectively. These samples also contained the lesser amount of iron and magnesium. The specific surface areas vary from 13.11 to 14.65 m2/g. The main mineral compound of both mica samples was muscovite (KAl2(AlSi3O10)(OH)2. There is negligible influence of the sample’s location on the chemical and mineralogical compositions of the mica. Бодончийн голын гялтгануурын найрлага, шинж чанарын судалгаа Хураангуй: Монгол оронд гялтгануурын орд газрууд цөөнгүй байдаг хэдий ч гялтгануурын нөөцийг нарийвчлан тогтоож, химийн найрлага болон эрдэс зүйн судалгааг хийсэн дорвитой судалгааны ажил төдийлөн байхгүй байна. Бид энэхүү судалгааны ажилдаа Ховд аймгийн, Алтай сумын Бодончийн голын гялтгануурын ордын ил газрын гадарга (гялтгануур-1) болон гүнийн (гялтгануур-2) гэсэн хоёр дээжийг сонгон авч шинж чанар, эрдэс бүрдэл зэргийг нарийвчлан судаллаа. Энэхүү судалгааны ажлын гол ач холбогдол нь өөрийн орны шаварлаг эрдсийг ашиглан шинэ материал гарган авах буюу өөрөөр хэлбэл, шаварлаг эрдсийг янз бүрийн нөхцөлд хүчлийн уусгалтанд оруулан нано нүх сүвэрхэг материал гарган авах ажлын үндсэн суурь судалгааны материал болох юм.Гялтгануурын дээжнүүдийн химийн найрлагыг рентгенфлуоросценц (XRF), эрдсийн найрлагыг рентгендиффрактометр (XRD), функциональ бүлгүүдийг нил улаан туяаны спектроскопийн арга (FTIR) болон нунтгийн хувийн гадаргуугийн талбайг багажит шинжилгээний аргаар (BET) тус тус тодорхойллоо.Химийн найрлагын хувьд гялтгануур-1 дээжинд цахиурын оксид 45.68%, хөнгөнцагааны оксид 31.22%, гялтгануур-2 дээжинд цахиурын оксид 45.2%, хөнгөнцагааны оксид 38.5% тус тус агуулагдаж байна. Мөн бага хэмжээний төмөр болон магни агуулсан байгааг тогтоолоо. Дээжнүүдийн хувийн гадаргуугийн талбай 13.11 - 14.65 м2/г байна. Гялтгануурын эрдсийн найрлагын судалгаагаар дээрхи 2 дээжинд голлон мусковитын (KAl2(AlSi3O10)(OH)2) төрлийн эрдэс байгааг тогтоолоо. Түлхүүр үг: гялтгануур, мусковит, шаварлаг эрдэс, биотит .

scholarly journals Correlation between Microstructure and Chemical Composition of Zinc Oxide Gas Sensor Layers and Their Gas-Sensitive Properties in Chlorine Atmosphere

2020 ◽  
Author(s):  
Marta Fiedot-Toboła ◽  
Patrycja Suchorska-Woźniak ◽  
Kamila Startek ◽  
Olga Rac-Rumijowska ◽  
Monika Kwoka ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Zinc Oxide ◽  
Chemical Composition ◽  
Specific Surface ◽  
Gas Sensor ◽  
Photoelectron Spectroscopy ◽  
Structural Defects ◽  
X Ray ◽  
Conductance Method ◽  
The Impact

In the article we present the results concerning the impact of structural and chemical properties of zinc oxide in various morphological forms, on its gas-sensitive properties tested in an atmosphere containing a very aggressive gas such as chlorine. Two types of ZnO sensor layers obtained by two different technological methods were used. Their morphology, crystal structure, specific surface area, porosity, surface chemistry and structural defects were characterized, and then compared with gas-sensitive properties in a chlorine-containing atmosphere. To achieve this goal scanning electron microscopy (SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and photoluminescence spectroscopy (PL) methods were used. The sensing properties of obtained active layers were tested by temperature stimulated conductance method (TSC). We have noticed that their response in chlorine atmosphere is not determined by the size of the specific surface or porosity. The obtained results showed that the structural defects of ZnO crystals play the most important role in chlorine detection. We demonstrated that the Cl2 adsorption is a concurrent process to oxygen adsorption. Both of them occur on the same active species (oxygen vacancies). They concentration is higher on the side planes of the zinc oxide crystal than the others. Thanks to the conducted studies authors demonstrated that to develop a new gas sensor devices not only changing of active layer chemical composition but also controlling its crystal structure and morphology could be used.

scholarly journals Modelling study on the effect of ash fusion characteristics on the biomass slagging behavior

2018 ◽  
Vol 22 (5) ◽  
pp. 2113-2121 ◽  
Author(s):  
Yiming Zhu ◽  
Houzhang Tan ◽  
Yanqing Niu ◽  
Yibin Wang ◽  
Hrvoje Mikulcic ◽  
...  
Keyword(s):  
Aluminum Oxide ◽  
Silicon Dioxide ◽  
Melting Temperature ◽  
Calcium Oxide ◽  
Deformation Temperature ◽  
Accretion Rate ◽  
Potassium Oxide ◽  
Cfd Modelling ◽  
Straw Ash ◽  
Modelling Study

Ash fusion characteristics of biomass have significant effect on slagging. In this work, the effects of ash fusion characteristics on slagging have been studied by ash fusion experiments and CFD modelling. Based on the basic ash composition of biomass, the mixture of silicon dioxide, calcium oxide, potassium oxide, and aluminum oxide have been selected as simulated ashes for ash fusion characteristics investigation. The results indicate that deformation temperature decreases with increased potassium oxide. High content of calcium oxide and silicon dioxide increase deformation temperature for the skeleton effect, respectively. The reactions of potassium oxide, calcium oxide and silicon dioxide lead to low melting products and decrease deformation temperature. Aluminum oxide increases deformation temperature by forming Si-Al-K compounds while K content is high and decreases deformation temperature while Ca or Si content is high due to the Si-Al-Ca compounds. On basis of the experimental results, an ash particle adhesion model has been developed using the corresponding characteristic temperatures of adhesion. Combined with the deposition model of inertial impaction, a CFD modelling study of ash deposition on heating surface has been performed. For a kind of cotton straw ash with low melting temperature, the modelling results indicate that adhesion of molten ash plays a major role during slagging. The accretion rate of molten ash adhesion accounts for 85% of the total accretion rate. For a kind of corn straw ash with high melting temperature, the proportion is only 37%. Compared with the actual slagging during biomass combustion, the modelling results can reflect a similar slagging situation on the surface of tube.

scholarly journals Formation of Interatomic Bonds of the Fumed Synthesis of Composites SiO2+Al2O3

2015 ◽  
Vol 16 (2) ◽  
pp. 425-431
Author(s):  
Ya.V. Zaulychnyy ◽  
М.V. Karpetz ◽  
Y.V. Yavorskyi ◽  
V.М. Gun'ko ◽  
V.I. Zarko ◽  
...  
Keyword(s):  
Aluminum Oxide ◽  
Silicon Dioxide ◽  
Electronic Structures ◽  
Emission Spectroscopy ◽  
Mass Ratio ◽  
X Ray Diffraction ◽  
X Ray ◽  
Valence Electrons

Crystalline and electronic structures of SiO2/Al2O3 mixtures have been analyzed using X-ray diffraction (XRD) and ultra-soft X-ray emission spectroscopy (USXES). Comparison of ultrasoft X-ray emission AlLα-, SiLα- and OKα-bands redistribution Alsp-, Sisp- and Op-valence electrons when changing the mass ratio (0,23Al2O3+0,77 SiO2;, 0,30Al2O3+0,70SiO2; 0,75Al2O3+25 SiO2) and depending on the method of obtaining them. Expansion OKα-emission bands showed an increase in population of Opπ-levels of oxygen in the formation of pyrogenic composites with different contents of aluminum oxide and silicon dioxide. Analysis AlLα-, SiLα- emission bands allowed to explain the increase of population Opπ-levels of oxygen and present the morphology  formation of particles different  of pyrogenic composites during synthesis.  

Synthesis, Characterization and Photocatalytic Activity of Copper (II)-Doped Titanium Dioxide Powders

2011 ◽  
Vol 391-392 ◽  
pp. 728-731 ◽  
Author(s):  
Wen Churng Lin ◽  
Wein Duo Yang
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Specific Surface ◽  
Photoelectron Spectroscopy ◽  
Effective Means ◽  
Sol Gel ◽  
Particle Growth ◽  
X Ray ◽  
Surface Areas ◽  
Vis Spectroscopy

Different concentration of copper (II) doped TiO2 photocatalyst powders were synthesized through the sol-gel method and characterized by X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), Brunauer–Emmett–Teller (BET)-specific surface area, transmission electron microscopy (TEM), and Ultraviolet–Visible (UV-Vis) spectroscopy. Cu2+-doping in the TiO2 promotes the particle growth, decreases the specific surface areas of powders, extends the absorption to visible light regions, and exhibits the vis-photocatalytic activity for methylene blue (MB) degradation. Appropriate content of Cu2+-doping is an effective means to improve the photocatalytic activity of TiO2 for MB degradation under visible light irradiation.

scholarly journals Characterization of Modified Natural Minerals and Rocks for Possible Adsorption and Catalytic Use

Molecules ◽  
2020 ◽  
Vol 25 (21) ◽  
pp. 4989
Author(s):  
Kateřina Strejcová ◽  
Zdeněk Tišler ◽  
Eliška Svobodová ◽  
Romana Velvarská
Keyword(s):  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Acid Leaching ◽  
Alkali Feldspar ◽  
Micropore Volume ◽  
Natural Materials ◽  
X Ray ◽  
Natural Minerals ◽  
Diffuse Reflectance Infrared

This study focused on natural materials such as clinoptilolite (CLI), metakaolin (MK), marlstone (MRL) and phonolite (PH). Clinoptilolite is one of the most known and common natural minerals (zeolites) with a unique porous structure, metakaolin is calcined kaolin clay, marlstone is a sedimentary rock and phonolite is an igneous rock composed of alkali feldspar and other minerals. These natural materials are mainly used in the building industry (additions for concrete mixtures, production of paving, gravels) or for water purification, but the modification of their chemical, textural and mechanical properties makes these materials potentially usable in other industries, especially in the chemical industry. The modification of these natural materials and rocks was carried out by leaching using 0.1 M HCl (D1 samples) and then using 3 M HCl (D2 samples). This treatment could be an effective tool to modify the structure and composition of these materials. Properties of modified materials were determined by N2 physisorption, Hg porosimetry, temperature programmed desorption of ammonia (NH3-TPD), X-ray fluorescence (XRF), X-ray powder diffraction (XRD), diffuse reflectance infrared Fourier transform (DRIFT) and CO2 adsorption using thermogravimetric analysis (TGA). The results of N2 physisorption measurements showed that that the largest increase of specific surface area was for clinoptilolite leached using 3M HCl. There was also a significant increase of the micropore volume in the D2 samples. The only exception was marlstone, where the volume of micropores was zero even in the leached sample. Clinoptilolite had the highest acidity and sorption capacity of CO2. TGA showed that the amount of CO2 adsorbed was not significantly related to the increase in specific surface area and the opening of micropores. Hg porosimetry showed that acid leaching using 0.1 M HCl and 3 M HCl resulted in a significant increase in the macropore volume in phonolite, and during leaching using 3M HCl there was an increase of the mesopore volume. From the better properties, cost-efficient and environmental points of view, the use of these materials could be an interesting solution for catalytic and sorption applications.

Synthesis of La0.8 Sr0.2 MnO3±δ Powders by Amorphous Citrate and Pechini Techniques

2005 ◽  
Vol 498-499 ◽  
pp. 630-635 ◽  
Author(s):  
Márcia Caldeira Brant ◽  
Jarlys Arthuri Zani ◽  
Fernando Soares Lameiras
Keyword(s):  
Specific Surface ◽  
Fluorescence Analysis ◽  
X Ray Diffraction ◽  
X Ray ◽  
Surface Areas ◽  
Type Process ◽  
Complex Process ◽  
Structure Phase ◽  
Specific Surface Areas

La0.8Sr0.2MnO3±d (LSM) powders were prepared by a Pechini-type polymerizable complex process and by amorphous citrate technique. Both processes involve the complexation of the LSM cations from their nitrates or carbonates. The aim of this work is to determinate the differences between the powers obtained by these techniques. The powders synthesized by the Pechini-type process were calcined between 500 °C and 1100 °C. The powders prepared by amorphous citrate technique were calcined at 900 °C. No contamination of either of the powders was observed by X ray fluorescence analysis. X ray diffraction results showed that a perovskitetype structure phase was obtained. BET results showed that the specific surface areas of the powders prepared by the polymerizable complex process and the amorphous citrate route were 6.6 m2g-1 and 5.7 m2g-1, respectively.

Calculation of activities in the system potassium oxide-aluminum oxide-silicon dioxide (KO0.5-AlO1.5-SiO2)

1978 ◽  
Vol 82 (25) ◽  
pp. 2688-2693 ◽  
Author(s):  
Isaac Eliezer ◽  
Naomi Eliezer ◽  
Reed A. Howald ◽  
Mary C. Verwolf
Keyword(s):  
Aluminum Oxide ◽  
Silicon Dioxide ◽  
Potassium Oxide

scholarly journals Preparation Method of Co3O4Nanoparticles Using Degreasing Cotton and Their Electrochemical Performances in Supercapacitors

2014 ◽  
Vol 2014 ◽  
pp. 1-9 ◽  
Author(s):  
Hongyan Xu ◽  
Libo Gao ◽  
Qiang Zhang ◽  
Junyang Li ◽  
Jiangtao Diwu ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Specific Surface ◽  
Photoelectron Spectroscopy ◽  
Nitrogen Adsorption ◽  
Electrochemical Performances ◽  
X Ray ◽  
Surface Areas ◽  
Synthetic Strategy ◽  
Different Temperatures ◽  
Specific Surface Areas

Co3O4nanoparticles were fabricated by a novel, facile, and environment-friendly carbon-assisted method using degreasing cotton. Structural and morphological characterizations were performed using X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The component of the sample obtained at different temperatures was measured by Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS). Nitrogen adsorption and desorption isotherms were utilized to reveal the specific surface areas. The formation mechanism of Co3O4nanoparticles was also proposed, demonstrating that the additive degreasing cotton played an indispensable role in the process of synthesizing the sample. The resultant Co3O4sample calcined at 600°C exhibited superior electrochemical performance with better specific capacitance and long-term cycling life, due to its high specific surface areas and pores structures. Additionally, it has been proved that this facile synthetic strategy can be extended to produce other metal oxide materials (e.g., Fe3O4). As a consequence, the carbon-assisted method using degreasing cotton accompanied a promising prospect for practical application.

scholarly journals Textural properties of V2O5/TiO2 catalysts obtained from VOCl3

1985 ◽  
Vol 2 (4) ◽  
pp. 241-251 ◽  
Author(s):  
C. Martin ◽  
V. Rives
Keyword(s):  
Specific Surface ◽  
Textural Properties ◽  
Nitrogen Adsorption ◽  
X Ray Diffraction ◽  
X Ray ◽  
Surface Areas ◽  
Specific Surface Areas ◽  
Monolayer Coverage

V2O5/TiO2 systems have been obtained by reacting TiO2 (P-25 from Degussa, ca 55% anatase, or a rutilised modification, ca 3% anatase) with gaseous VOCl3. The samples have been characterised by X-ray diffraction, UV–Vis spectrophotometry and nitrogen adsorption at 77 K. For the anatase carrier, a monolayer coverage of V2O5 is achieved, but only 0·46 monolayers are formed with the rutilised support. The specific surface areas decrease upon incorporation of V2O5, and that seems to be well dispersed without forming crystallites.

Co(Ni)/MoS2 Nanostructured Catalysts for the Hydrodesulphurization of Dibenzothiophene

2008 ◽  
Vol 8 (12) ◽  
pp. 6437-6444 ◽  
Author(s):  
M. A. Albiter ◽  
R. Huirache-Acuña ◽  
F. Paraguay-Delgado ◽  
F. Zaera ◽  
G. Alonso-Núñez
Keyword(s):  
Electron Microscopy ◽  
Specific Surface ◽  
Photoelectron Spectroscopy ◽  
Nanostructured Catalysts ◽  
X Ray Diffraction ◽  
X Ray ◽  
Molar Ratios ◽  
Surface Areas ◽  
Transmission Electron ◽  
Catalytic Test

In this study Co(Ni)/MoS2 unsupported nanocatalysts (nanorods and nanoribbons) were synthesized with Co(Ni)/(Co(Ni)+Mo)=0.3, 0.5 molar ratios for Co and Ni respectively. First the α-MoO3 nanostructures were impregnated with an aqueous solution of Co(Ni)Cl2·6H2O or Co(Ni)(NO3)2·6H2O, then were treated for 2 h at 473 K, and finally the precursors were activated under a H2S/H2 mixture (15% v/v H2S) by ramping the temperature from room temperature to 773 K and keeping it at that value for 2 h. The resulting materials were characterized by scanning electron microscopy, energy dispersive X-ray spectroscopy, transmission electron microscopy, X-ray diffraction, specific surface area and X-ray photoelectron spectroscopy, and tested as catalysts for the hydrodesulfurization (HDS) of dibenzothiophene (DBT). It was found that these materials presented specific surface areas below 25 m2/g. The catalytic test showed that only when Co is added a promoter effect is observed compared with MoS2 unpromoted catalysts. Among the materials prepared, the Co/MoS2 catalyst made from cobalt chloride presented the highest catalytic activity (6.95 mol s−1 g−1catalyst) for the HDS of DBT. The selectivity for the latter indicated a clear preference for the direct desulphurization over the hydrogenating pathway.

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