scholarly journals Characteristics and Stability of Mercury Vapor Adsorption over Two Kinds of Modified Semicoke

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
Zhang Huawei ◽  
Liu Xiuli ◽  
Wang Li ◽  
Liang Peng
Keyword(s):  
Functional Groups ◽  
Active Sites ◽  
Chemical Properties ◽  
Mercury Vapor ◽  
Vapor Adsorption ◽  
Modification Process ◽  
Delocalized Electron ◽  
The Stability ◽  
Physical And Chemical ◽  
And Chemical Properties

In an attempt to produce effective and lower price gaseous Hg0adsorbents, two methods of HCl and KMnO4/heat treatment were used respectively for the surface modification of liginite semicoke from inner Mongolia. The different effects of modification process on the surface physical and chemical properties were analyzed. The characteristics and stability of mercury vapor adsorption over two kinds of modified semicoke were investigated. The results indicated that modification process caused lower micropore quantity and volume capacity of semicoke; the C-Cl functional groups, C=O bond and delocalized electronπon the surface of Cl-SC, the amorphous higher valencyMnx+, and O=C–OH functional groups on the surface of Mn-H-SC were the active sites for oxidation and adsorption of gaseous Hg0. Modification process led to higher mercury removal efficiency of semicoke at 140°C and reduced the stability of adsorbed mercury of semicoke in simulated water circumstance simultaneously.

scholarly journals Influence of the Bottom Color Modification and Material Color Modification Process on the Performance of Modified Poplar

Coatings ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 660
Author(s):  
Qingqing Liu ◽  
Di Gao ◽  
Wei Xu
Keyword(s):  
Chemical Properties ◽  
Target Color ◽  
Modification Process ◽  
Red Color ◽  
The Difference ◽  
Pre Treatment ◽  
Physical And Chemical ◽  
Surface Differentiation ◽  
Color Modification ◽  
And Chemical Properties

According to the old surface coating process of European and American furniture, the surface of modified poplar is first differentiated pre-treatment, and then the bottom color modification and material color modification are respectively applied to the modified poplar after the surface differentiation treatment. The visual physical quantity and physical and chemical properties were measured and compared with mahogany, which is commonly used in old furniture in Europe and America to explore the effect of colorants and coloring steps, as well as different surface pretreatments on the coloring effect. Finally, it is concluded that continuous coloring operations can narrow the difference in brightness and red color value in the coloring layer of modified poplar and mahogany. Continuous coloring operations increase the difference between the yellow-green color values of modified poplar and mahogany. Therefore, the coloring difference between modified poplar and mahogany was affected by the colorant and coloring steps. Through color accumulation, the gap between the two in the target color coloring effect can be reduced, thereby reducing the difference between the coloring effect of modified poplar and mahogany.

Vegetable oils – raw materials for producing biodiesel

2021 ◽  
Vol 80 (2) ◽  
pp. 286-292
Author(s):  
T. Mamilov ◽  
◽  
G.S. Aitkaliyeva ◽  
A.B. Ismailova ◽  
M.A. Yelubay ◽  
...  
Keyword(s):  
Functional Groups ◽  
Vegetable Oils ◽  
Raw Materials ◽  
Chemical Properties ◽  
Biodiesel Fuel ◽  
Physical And Chemical Properties ◽  
Sunflower Oils ◽  
Transesterification Method ◽  
Physical And Chemical ◽  
And Chemical Properties

This paper presents the results of a study of the physical and chemical properties of samples of vegetable oils (sunflower, rapeseed, olive). It has been shown that the viscosity of oils varies from 41.4 to 61.7 cSt at a temperature of 40 ° C for olive and sunflower oils, respectively. The acid numbers of the oil samples were also determined, it was found that the lowest indicator is characteristic of sunflower oil. Pour points of oils also range from -3 to -16 ° C for olive and sunflower oils, respectively. Using the method of IR spectroscopy, functional groups in the composition of samples of vegetable oils were studied and it was shown that the composition of oils contains carbonyl and hydroxyl functional groups, indicating the presence of carboxylic acids. Based on studies of the physical and chemical properties of vegetable oils, it was found that sunflower, olive and rapeseed oils can serve as raw materials for the synthesis of biofuels based on them, since they contain free fatty acids. To obtain biodiesel fuel based on vegetable oils, it is planned to use the transesterification method in the presence of various catalysts (alkaline, acidic, and complex).

Synthesis and Kinetic Investigations for the Isomerization Process of 2–Hydroxy Chalcone Derivatives

2019 ◽  
Vol 41 (6) ◽  
pp. 1046-1046
Author(s):  
Omar A Shareef Omar A Shareef ◽  
Said A Said and Ali Y Abdulrazaq Said A Said and Ali Y Abdulrazaq
Keyword(s):  
Biological Activities ◽  
Chemical Properties ◽  
Physical And Chemical Properties ◽  
Pseudo First Order Reaction ◽  
First Order ◽  
Steric Factors ◽  
Kinetic Investigations ◽  
The Stability ◽  
Physical And Chemical ◽  
And Chemical Properties

The wide biological activities of flavanones are mainly depends on their physical and chemical properties, thus a number of substituted 2-Hydroxy chalcones have been synthesized, and their isomerization to their corresponding flavanones was studied. In order to determine the rate constant, kinetic experiments were performed using HPLC technique in (9:1) (CH3CN:H2O) medium at different temperature (298-318) K. The obtained results were interpreted by four steps mechanism, which considered the existence of phenoxide ion as the key intermediate. This study performed with a pseudo first order ( reaction in which the rate for the studied compounds follow the sequence 5 andgt; 2 andgt; 1 andgt; 4 andgt; 3, the activation energy have the same sequence for these compounds .The effect of substituents on the rate showed that electronic and steric factors play reasonable role on the stability of the product .

The Establishment of the 3rd National Reference Standard for Tachypleus Tridentatus Lysate

2017 ◽  
Vol 6 (3) ◽  
pp. 50
Author(s):  
Tong Cai ◽  
Guolai Zhang ◽  
Yusheng Pei ◽  
Hua Gao
Keyword(s):  
Chemical Properties ◽  
Physical And Chemical Properties ◽  
Reference Standard ◽  
Tachypleus Tridentatus ◽  
National Reference ◽  
The Stability ◽  
Physical And Chemical ◽  
And Chemical Properties

<p><strong>Objective</strong>  To establish the 3rd national reference standard for Tachypleus Tridentatus Lysate Reagent. <strong>Method</strong> <strong>and Results</strong>  The candidates of reference standard were studied for the physical and chemical properties, and the stability. To determined its sensitivity by collaboration calibration. <strong>Conclusions</strong>  The sensitivity of the 3rd national reference standard for TAL is 0.06EU / ml, lot number is 150603-201003.</p>

Salting-out and salting-in experiments with lignosulfonates (LSs)

Holzforschung ◽  
2013 ◽  
Vol 67 (5) ◽  
pp. 549-557 ◽  
Author(s):  
Bernt O. Myrvold
Keyword(s):  
Chemical Properties ◽  
Physical And Chemical Properties ◽  
Salting Out ◽  
Practical Applications ◽  
Common Ion ◽  
The Common ◽  
Common Ion Effect ◽  
The Stability ◽  
Physical And Chemical ◽  
And Chemical Properties

Abstract The solubility of lignosulfonates (LSs) in water is strongly dependent on other ions present in the water phase. The differences in the solubility might strongly influence the measurements of the physical and chemical properties of the LS molecules. A reduced solubility of the LS might also affect its utility in many practical applications. The understanding of the interaction between LSs and various salts is important for both practical and theoretical reasons. Therefore, the effect of salt concentrations on the LS has been investigated for 41 different salts with 14 different cations and 16 different anions. The observations cannot be explained by the common ion effect or the screening effects. On the contrary, it was found that the stability of LS solutions follows the Hofmeister series, with the exception of those ions that will chemically interact with the LS molecule. Moreover, the positions of phosphate (HPO42-) and sulfate (SO42-) ions were reversed.

scholarly journals COMPLEXATION OF APPLE PECTIN, MODIFIED TO PHARMACOPHORE, WITH THE CATIONS MANGANESE (II) IN AQUEOUS SOLUTIONS

2020 ◽  
pp. 25-32
Author(s):  
Roza Khanifovna Mudarisova ◽  
Alina Failovna Sagitova ◽  
Ol'ga Sergeyevna Kukovinets
Keyword(s):  
Metal Complexes ◽  
Chemical Properties ◽  
Thermodynamic Characteristics ◽  
Standard Thermodynamic Characteristics ◽  
Anthranilic Acids ◽  
Drug Compound ◽  
The Stability ◽  
Physical And Chemical ◽  
And Chemical Properties ◽  
Polymer Ligand

Complex formation in systems containing manganese (II), natural pectin and/or pectin modified by organic pharmacophores (nicotine, salicylic, 5-aminosalicylic, anthranilic acids) was studied by spectral (UV-, IR-, NMR 13C spectroscopy), potentiometric and viscometric methods. Method isomolar series and the molar relationship defined by the molar composition and the range of stability of metal complexes: pectin + nicotinic acid > pectin + acid 5-aminosalicylic > pectin + anthranilic acid > pectin + salicylic acid > native pectin. It is shown that the stability constant of metal complexes is significantly influenced by the reaction temperature and the structure of the pharmacophore. The presence of an amino group in the structure of an aromatic molecule increases the stability of metal complexes by 1.5–2 orders of magnitude. The standard thermodynamic characteristics (∆Hº; ∆Gº; ∆Sº) are calculated, which indicate that the processes of complexation in all cases are enthalpy-entropy favorable (∆Hº<0, ∆Sº>0) and proceed spontaneously (∆Gº<0). The influence of the structure of the drug compound in the polymer ligand on a number of physical and chemical properties of metal complexes was revealed. The data of NMR 13C and IR-spectra allow us to conclude that not only carboxyl groups but also hydroxyl functions of polymer matrices participate in the coordination interaction of pectin and/or pharmacophore-containing pectin with manganese (II) cations.

scholarly journals Partial synthetic models of FeMoco with sulfide and carbyne ligands: Effect of interstitial atom in nitrogenase active site

2021 ◽  
Vol 118 (49) ◽  
pp. e2109241118
Author(s):  
Linh N. V. Le ◽  
Gwendolyn A. Bailey ◽  
Anna G. Scott ◽  
Theodor Agapie
Keyword(s):  
Active Sites ◽  
Chemical Properties ◽  
Metal Centers ◽  
Bridging Ligand ◽  
Reduction Potentials ◽  
Protein Active Sites ◽  
Physical And Chemical ◽  
Synthetic Models ◽  
And Chemical Properties

Nitrogen-fixing organisms perform dinitrogen reduction to ammonia at an Fe-M (M = Mo, Fe, or V) cofactor (FeMco) of nitrogenase. FeMco displays eight metal centers bridged by sulfides and a carbide having the MFe7S8C cluster composition. The role of the carbide ligand, a unique motif in protein active sites, remains poorly understood. Toward addressing how the carbon bridge affects the physical and chemical properties of the cluster, we isolated synthetic models of subsite MFe3S3C displaying sulfides and a chelating carbyne ligand. We developed synthetic protocols for structurally related clusters, [Tp*M’Fe3S3X]n−, where M’ = Mo or W, the bridging ligand X = CR, N, NR, S, and Tp* = Tris(3,5-dimethyl-1-pyrazolyl)hydroborate, to study the effects of the identity of the heterometal and the bridging X group on structure and electrochemistry. While the nature of M’ results in minor changes, the chelating, μ3-bridging carbyne has a large impact on reduction potentials, being up to 1 V more reducing compared to nonchelating N and S analogs.

scholarly journals Agrochemical properties of soils of land plots of the Park «Tikhiy Otdykh» of Saint Petersburg

2021 ◽  
pp. 102-117
Author(s):  
В.Ф. Ковязин ◽  
П.М. Демидова ◽  
Е.А. Иванова
Keyword(s):  
Geographical Information Systems ◽  
Current Problem ◽  
Chemical Properties ◽  
Geographical Information ◽  
Physical And Chemical Properties ◽  
Saint Petersburg ◽  
Agrochemical Properties ◽  
The Stability ◽  
Physical And Chemical ◽  
And Chemical Properties

Статья посвящена актуальной проблеме формирования устойчивости парковых насаждений, произрастающих на почвах с различными физико-химическими свойствами. Приведены характерные агрохимические свойства почв парка «Тихий отдых» Санкт-Петербурга. По каждому агрохимическому показателю почвы разработаны с использованием современных географических информационных систем (ГИС) тематические карты в масштабе 1:10000 с применением программного комплекса AutoCAD. С использованием данного комплекса рассчитаны площади земельных угодий, имеющих различные физико-химические свойства почвы. В настоящее время данная проблема городских садово-парковых объектов мало изучена и требует дальнейших исследований, именно этой тематике и посвящены изложенные в статье результаты исследований. The article is devoted to the current problem of forming the stability of Park stands growing on soils with different physical and chemical properties. The characteristic agrochemical properties of the soils of the Park «Tikhiy Otdykh» of St. Petersburg are given. For each agrochemical indicator of the soil, thematic maps were developed using modern geographical information systems (GIS) at a scale of 1:10000 using the AutoCAD software package. Using this complex, the areas of land with different physical and chemical properties of the soil are calculated. At present, this problem of urban garden and Park objects is poorly studied and requires further research. These results presented in the article are devoted to this topic.

Interfacial study of nanophase Pt or Pd particles on the surface of nanophase WO3 or TiO2 particles

1993 ◽  
Vol 51 ◽  
pp. 1122-1123
Author(s):  
Chi-Ming Hsu ◽  
Hong-Ming Lin ◽  
Chiun-Yen Tung ◽  
Teh-Yu Hsu ◽  
Chao-Cheng Yang
Keyword(s):  
Active Sites ◽  
Crystal Size ◽  
Energy Gap ◽  
Pure Titanium ◽  
Chemical Properties ◽  
Gas Condensation ◽  
The Family ◽  
Multi Phase ◽  
Physical And Chemical ◽  
And Chemical Properties

Nanocrystalline (NC) metals are a subdivision of the family of nanostructural materials. Nanostructural materials are single phase or multi-phase polycrystals, the crystal size of which is of the order of a few (typically 1-100) nanometers in at least one dimension. Nanocrystalline materials have many interesting physical and chemical properties which attract researchers. Particularly in catalyst’s utility, it can provide a large specific surface area and active sites. Its size efficiency (Kubo efficiency) may create different electron energy gap which permits us to do other functional designs. Some phenomenons contribute to attractiveness of nanocrystalline material as catalysts or sensors. The interfacial study between NC metal and oxides became an important issue to evaluate the performance of the these applications.Gas-condensation technique is used to produce the nanophase WO3 or TiO2 by evaporating the tungsten in 10 mbar O2 atmosphere or pure titanium in (10 mbar O2/90 mbar He) atmosphere, respectively.

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