scholarly journals Deep desulfurization performance of thiophene with deep eutectic solvents loaded carbon nanotube composites

2021 ◽  
Vol 8 (4) ◽  
Author(s):  
Yue Liu ◽  
Jiaojiao Xue ◽  
Xin Zhou ◽  
Yingna Cui ◽  
Jingmei Yin
Keyword(s):  
Composite Material ◽  
Chemical Properties ◽  
Oxidation Mechanism ◽  
Deep Eutectic Solvents ◽  
Fuel Oil ◽  
Desulfurization Rate ◽  
Composites Materials ◽  
Deep Desulfurization ◽  
Physico Chemical ◽  
Nanotube Composites

One source of air pollution is the combustion of sulfur compounds in fuel oil. Reducing sulfur content in fuel oil has become a hot issue demanding timely solutions. Using ionic liquids and deep eutectic solvents (DESs) to remove sulfides in fuel oil has achieved good results presently. However, since DESs are liquid and their transportation and separation are inconvenient, a new way is proposed that the DESs are loaded on the carbon nanotubes (CNTs) with large specific surface area and good chemical stability. A series of composites materials (DESs/CNTs) were prepared. Finally, they are applied to the removal of sulfides in fuel oil. This loading method, which imparts introduced unique physico-chemical properties of the DESs to the carrier materials, preserves both advantages while overcoming some of the problems with DESs. The interaction between DESs and CNTs is mutual promotion. Therefore, this study has important theoretical significance and industrial application value. Under optimal conditions, when the reagent ChCl/p-TsOH (1 : 2) was loaded on multi-walled CNTs (OD = 30–60 nm) to prepare the composite material (ChCl/p-TsOH)/CNTs, the single desulfurization rate of the composite material was 95.8%. Finally, the catalytic/oxidation mechanism was studied systematically and this work would provide a green route for the desulfurization of fuels.

scholarly journals PHYSICO-CHEMICAL PROPERTIES OF A COMPOSITE MATERIAL BASED ON CALCIUM HYDROPHOSPHATE AND A SUBSTRATE FROM ASPEN BARK

2020 ◽  
pp. 357-364
Author(s):  
Mikhail Yur'yevich Belash ◽  
Irina Vladimirovna Korol'kova ◽  
Yevgeniya Vladimirovna Veprikova ◽  
Galina Nikolayevna Bondarenko ◽  
Irina Vladimirovna Korol'kova ◽  
...  
Keyword(s):  
Composite Material ◽  
Water Resistance ◽  
Catalytic Effect ◽  
Substrate Surface ◽  
Chemical Properties ◽  
Analysis Data ◽  
X Ray ◽  
Physico Chemical ◽  
Mineral Components ◽  
Initial Content

The physicochemical properties of the composite material obtained by sequentially impregnating the substrate from aspen bark with water solutions of KH2PO4 and CaCl2 under certain conditions were studied. Using the method of X-ray phase analysis, it was found that the main products of the interaction of KH2PO4 and CaCl2, which flows from the aspen bark on the substrate surface, are CaHPO4 and KCl. In this case, calcium chloride is present in the obtained composite material in the form of a complex compound CaCl2·Ca(OH)2·H2O. Using IR-spectral analysis, it was revealed that there is no interaction between the functional groups of the aspen bark substrate and mineral compounds during the preparation of the composite material. Based on thermal analysis data, the catalytic effect of the mineral components that make up the developed composite material on the decomposition of hemicellulose, cellulose and lignin that make up the substrate from aspen bark is revealed. It was found that the composite material modified with CaHPO4 is characterized by increased water resistance and after treatment with water at room temperature for 24 hours, 9.85% of phosphates are removed from it (from their initial content). This allows one to use the resulting composite material based on aspen bark as a delayed-action fertilizer.

scholarly journals Effect of complex flame retardant on physico-chemical properties of orthophthalic unsaturated resin

2020 ◽  
pp. 26-29
Author(s):  
Y. M. Yevtushenko ◽  
Y. A. Grigoriev ◽  
I. O. Kuchkina ◽  
E. V. Afoshina ◽  
G. A. Krushevsky
Keyword(s):  
Mechanical Properties ◽  
Composite Material ◽  
Composite Materials ◽  
Flame Retardant ◽  
Unsaturated Polyester ◽  
Chemical Properties ◽  
Physical And Mechanical Properties ◽  
Polyester Resins ◽  
Physico Chemical ◽  
Kinetics Of

A brief review of the results of studies on reducing the combustibility of composite materials based on unsaturated polyester resins is presented. A flame retardant orthophthalic unsaturated resin based on a complex flame retardant was developed and studied. It is shown that the category for resistance to burning of the resin is achieved with 15–20% filling of the complex flame retardant based on ammonium polyphosphate, melamine and pentaerythritol. The kinetics of curing and physical and mechanical properties of the composite material are evaluated.

Decoration of specific sites on freeze-fractured membranes

1978 ◽  
Vol 36 (2) ◽  
pp. 140-141
Author(s):  
H. Gross ◽  
H. Moor
Keyword(s):  
Pure Water ◽  
Freeze Fracture ◽  
Chemical Properties ◽  
Surface Forces ◽  
Sulfate Pentahydrate ◽  
Copper Sulfate Pentahydrate ◽  
Physico Chemical ◽  
Water Of Hydration ◽  
Small Container ◽  
Binding Forces

Fracturing under ultrahigh vacuum (UHV, p ≤ 10-9 Torr) produces membrane fracture faces devoid of contamination. Such clean surfaces are a prerequisite foe studies of interactions between condensing molecules is possible and surface forces are unequally distributed, the condensate will accumulate at places with high binding forces; crystallites will arise which may be useful a probes for surface sites with specific physico-chemical properties. Specific “decoration” with crystallites can be achieved nby exposing membrane fracture faces to water vopour. A device was developed which enables the production of pure water vapour and the controlled variation of its partial pressure in an UHV freeze-fracture apparatus (Fig.1a). Under vaccum (≤ 10-3 Torr), small container filled with copper-sulfate-pentahydrate is heated with a heating coil, with the temperature controlled by means of a thermocouple. The water of hydration thereby released enters a storage vessel.

The microstructure of a TiB2/Ti-47 Al composite material

1989 ◽  
Vol 47 ◽  
pp. 674-675
Author(s):  
O. Popoola ◽  
A.H. Heuer ◽  
P. Pirouz
Keyword(s):  
Composite Material ◽  
Ion Beam ◽  
Chemical Properties ◽  
Intermetallic Alloys ◽  
Transmission Electron ◽  
Diamond Polishing ◽  
Al Composite ◽  
The Matrix ◽  
Argon Ion ◽  
And Chemical Properties

The addition of fibres or particles (TiB2, SiC etc.) into TiAl intermetallic alloys could increase their toughness without compromising their good high temperature mechanical and chemical properties. This paper briefly discribes the microstructure developed by a TiAl/TiB2 composite material fabricated with the XD™ process and forged at 960°C.The specimens for transmission electron microscopy (TEM) were prepared in the usual way (i.e. diamond polishing and argon ion beam thinning) and examined on a JEOL 4000EX for microstucture and on a Philips 400T equipped with a SiLi detector for microanalyses.The matrix was predominantly γ (TiAl with L10 structure) and α2(TisAl with DO 19 structure) phases with various morphologies shown in figure 1.

Physico-Chemical Properties of Recombinant Desulphatohirudin

1990 ◽  
Vol 63 (03) ◽  
pp. 499-504 ◽  
Author(s):  
A Electricwala ◽  
L Irons ◽  
R Wait ◽  
R J G Carr ◽  
R J Ling ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Gel Filtration ◽  
Chemical Properties ◽  
Alpha Helix ◽  
Apparent Molecular Weight ◽  
Correlation Spectroscopy ◽  
Nmr Studies ◽  
Recombinant Hirudin ◽  
Physico Chemical ◽  
Recombinant Molecule

SummaryPhysico-chemical properties of recombinant desulphatohirudin expressed in yeast (CIBA GEIGY code No. CGP 39393) were reinvestigated. As previously reported for natural hirudin, the recombinant molecule exhibited abnormal behaviour by gel filtration with an apparent molecular weight greater than that based on the primary structure. However, molecular weight estimation by SDS gel electrophoresis, FAB-mass spectrometry and Photon Correlation Spectroscopy were in agreement with the theoretical molecular weight, with little suggestion of dimer or aggregate formation. Circular dichroism studies of the recombinant molecule show similar spectra at different pH values but are markedly different from that reported by Konno et al. (13) for a natural hirudin-variant. Our CD studies indicate the presence of about 60% beta sheet and the absence of alpha helix in the secondary structure of recombinant hirudin, in agreement with the conformation determined by NMR studies (17)

Physico-chemical properties of the rare-earth metals, scandium, and yttrium

1963 ◽  
Vol 79 (2) ◽  
pp. 263-293 ◽  
Author(s):  
E.M. Savitskii ◽  
V.F. Terekhova ◽  
O.P. Naumkin
Keyword(s):  
Rare Earth ◽  
Rare Earth Metals ◽  
Chemical Properties ◽  
Physico Chemical ◽  
The Rare Earth

Physico chemical properties and gas adsorption separation characteristics of Itaya zeolite and its modified products.

1990 ◽  
Vol 39 (442) ◽  
pp. 996-1000 ◽  
Author(s):  
Ayao TAKASAKA ◽  
Hideyuki NEMOTO ◽  
Hirohiko KONO ◽  
Yoshihiro MATSUDA
Keyword(s):  
Gas Adsorption ◽  
Chemical Properties ◽  
Physico Chemical
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