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Current Issue
2020 Vol.37 Issue.3,
Published 2020-05-15
0
2020 Vol. 37 (3): 0-0 [
Abstract
] (
3935
) [
HTML
1KB] [
PDF
716KB] (
1117
)
1
Progress in Simultaneous Desulfurization and Denitrification of Coal-Fired Flue Gas
Yao Shumei, Wang Baowei
Coal is still the main source of energy in China. SO
2
and NO
x
emissions from coal combustion are yet one of the main sources of pollution. In this paper, the recent technologies that includes liquid phase absorption, ultraviolet advanced oxidation, low temperature plasma, electron beam, combining ozone pre-oxidation with chemical absorption and dry catalytic regeneration technology for simultaneous desulfurization and denitrification of coal-fired flue gas are summarized and reviewed in detail. The influencing factors of SO
2
and NO
x
removal efficiency were analyzed. The application of these technologies is prospected.
2020 Vol. 37 (3): 1-9 [
Abstract
] (
4031
) [
HTML
1KB] [
PDF
2611KB] (
1055
)
10
Process of the Influence on Desulfurization and Denitration with Activated Carbon Supported Metal Oxides
Peng Jian, Yao Wen
A serious problem of obtaining energy from fossil and biomass fuels is the release of acidic gases, which raises concern about health and the environment. In dry desulfurization and denitration technology, the adsorption of SO
2
and NO
x
gas by modified activated carbon from renewable energy has been proved to be an efficient method. It has aroused much concern for its low investment and simple process and small space occupying. The article introduces the mechanism of desulfurization and denitration by activated carbon. It was generalized that activated carbon-supported metal oxide significantly improves desulfurization activity and denitration activity. The application of different species supported by activated carbon in desulfurization and denitration was summarized. The development trend of desulfurization and denitration by active carbon supported metal oxides was discussed.
2020 Vol. 37 (3): 10-16,49 [
Abstract
] (
4763
) [
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1KB] [
PDF
1168KB] (
1848
)
17
Preparation of KF-SBA-15 and its Catalytic Knoevenagel Reaction
Li Linlin, Gong Wei, Fu Hai, Pei Xianglin, Chen Zhuo, Yin Xiaogang
Mesoporous molecular sieves SBA-15 and KF-SBA-15, were prepared by using P123 tetraethyl orthosilicate and KF as raw materials, and the structures were confirmed by IR, BET, TG and XRD. The Knoevenagel condensation reaction of benzaldehyde and malononitrile was catalyzed by mesoporous molecular sieve KF-SBA-15. The effects of catalyst dosage, solvent, molar ratio of raw materials and catalyst type on the yield were investigated. The optimum conditions were as follows: the ratio of aromatic aldehyde to malononitrile was 1:1, the amount of catalyst was 10%(mole fraction) of benzaldehyde. The reaction was carried out for 30 min at room temperature and the yields could be 93.6%.
2020 Vol. 37 (3): 17-22 [
Abstract
] (
4894
) [
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1KB] [
PDF
1839KB] (
2486
)
23
Synthesis and Properties of a Novel Triphenylamine Hole Transport Material
Zhang Songlin, Li Wei, Feng Wenhui, Wang Tianyang, Liu Dongzhi, Zhou Xueqin
Using 2,7-diiodo-9,9-dimethylindole as starting material, the Buchwald-Hartwig cross-coupling reaction and Ullmann reaction were used to obtain the target compound 9,9-dimethyl-N2, N7-diphenyl-N2, N7-di-P-tolyl-9H-fluorene-2,7-diamine(d-TPA). The elucidation of chemical structure was proved by
1
H NMR,
13
C NMR and HRMS-ESI. It is shown that the Ullmann reaction with copper powder as the catalyst is the most efficient synthetic method (yield 85%). From the results of X-ray diffraction (XRD) and cyclic voltammetry (CV), the material was amorphous and has the ability to form a good thin film. And the compound has a highest occupied molecular orbit (HOMO) energy level of -5.23 eV, which is similar to the common anode material ITO work function and has good chemical stability, which is beneficial for the injection of hole carriers to the counter electrode. Organic lighting-emitting diodes (OLED) using the compound as hole transport material was prepared and characterized. The results show that the device has a light-emitting voltage of 3.8 V, a maximum luminance of 21 412 cd/m
2
and a maximum current efficiency of 4.78 cd/A. From the results, it has been proved that the compound is expected to be a novel hole transport material with excellent performance.
2020 Vol. 37 (3): 23-30 [
Abstract
] (
3914
) [
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1KB] [
PDF
2776KB] (
2023
)
31
Synthesis and Antitumor Activities of Novel Pyrimidine Derivatives
Liu Luxian, Zhou Xueqin, Liu Dongzhi, Wang Tianyang, Li Wei
Structural modification of NVP-TAE684 was based on the reported ALK kinase inhibitor. Compound
1
was introduced into the nitrogen heterocycle pyrazine by amination to obtain compound
2
, Boc group was then removed to give amine intermediates (
3
). Two pyrazine modified pyrimidine derivatives (
7a, 7b
) were finally obtained through palladium-catalyzed C-N coupling reactions of compound
3
(
3a, 3b
) and electrophilic reagent
6
. Intermediates
2, 3
and the target compounds
7
have not been reported in other literature. The structures of all six novel compounds have been characterized by
1
H NMR,
13
C NMR and HRMS-ESI. MTT method was employed to investigate the in vitro inhibition activities of
7a
or
7b
against non-small cell lung cancer NCI-H460 and NCI-H520. The results indicate that
7a
and
7b
show good inhibition activities and
7a
shows the IC
50
value of 52.10±0.10 nM against NCI-H460.
2020 Vol. 37 (3): 31-38 [
Abstract
] (
4278
) [
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1KB] [
PDF
2960KB] (
1272
)
39
Technics Optimization of Hydrogen Peroxide Modified Rice Straw as Pb(Ⅱ) Adsorbent
Tang Qi, Liu Pan, Tu Sheng, Li Chuanqiang
As an adsorbent for Pb(Ⅱ) ions, hydrogen peroxide modified rice straw shows the advantage of environmental safety and simple modification process, low cost, and high adsorption rate for Pb(Ⅱ) ions. Optimization of the modification process has a strong practical value. Some factors, including medium pH, H
2
O
2
dosage, Fe
2+
/H
2
O
2
molar ratio, modification temperature, modification time, particle size and dosage of rice straw were investigated in detail. Based on single factor experiments, the modification technics were further optimized through orthogonal experiments and comparative experiments. The optimum modification technics are as follows: in 100 mL of solution, Fe
2+
/H
2
O
2
molar ratio was 0, rice straw dosage was 3 g, particle size was 40 mesh, medium pH was 8, H
2
O
2
dosage was 30% of the mass of rice straw, modification temperature was 20 ℃, and modification time was 4 h. 2 g adsorbent prepared under the optimal conditions selected was used to treat 100 mL of 200 mg/L simulated wastewater containing Pb(Ⅱ) ions. The adsorption rate of Pb(Ⅱ) ions was 94.45% and the adsorption capacity of adsorbent was 9.445 mg/g. It shows that rice straw modified by H
2
O
2
has good adsorption property.
2020 Vol. 37 (3): 39-44,59 [
Abstract
] (
4358
) [
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1KB] [
PDF
1506KB] (
1158
)
45
Solvent Selection in Ethylene Slurry Polymerization Process
Lü Shijun
The solvent selection is very important in the ethylene slurry polymerization process. The influence of solvent on the different aspects such as the polyethylene solubility in different solvent, relationship between boiling point and operating pressure, the effect of solvent evaporation enthalpy on the way of reaction heat removal, and separation process of polymerization slurry, were discussed. The results show that
n
-pentane is the most feasible solvent to vertical stirrer polymerization reactor, and iso-butane and propane are better solvents to loop polymerization reactor.
2020 Vol. 37 (3): 45-49 [
Abstract
] (
3611
) [
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1KB] [
PDF
828KB] (
2311
)
50
Numerical Simulation of Wet Desulfurization by Screw Static Mixer with Different Structure
Gao Zhe, Zhao Feng, Yu Jianfeng, Cui Zhengwei
Static screw mixer with variable pitch was used as a new desulfurization rig with high performance gas-liquid mass transfer efficiency. In order to optimize structural parameters of this mixer, a gas-liquid two-phase flow model was established in Barracuda
TM
software trough Euler-Lagrangian method, and the effects of this mixers with different variable pitch coefficient
m,
length to diameter ratio
l/d
and rotation angle of flow path section
φ
on desulfurization efficiencies (DE) were simulated based on above method and SO
2
absorption rate equation. In condition of sufficient reactants available, the simulation results indicate that DE decreases with the increase of
m,
then tends to be flat when
m
≥0.50; DE increases with the increase of
l/d,
and tends to be flat when
l/d
=11, then rises again at
l/d
=14; DE increases with the increase of
φ,
then begins to be stable at
φ
near 630°. Based on above results, combined with the pressure drop and other indicators, the structural parameters (
m
=0.4,
l/d
=11,
φ
=630°) of this mixer were recommended. And experiments of this mixer with optimal structure was carried with the result of DE, 99.35% and outlet SO
2
concentration, 19.56 mg.m
-3
, which exceeds the standard values of ultra-clean emission. Above results provide a basis for the design and manufacture of static screw desulfurization device at industrial-scale.
2020 Vol. 37 (3): 50-59 [
Abstract
] (
4158
) [
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1KB] [
PDF
4580KB] (
917
)
60
Research on the Preparation of Regenerated Titanium Tungsten Powder by Recycling SCR Denitration Catalyst
Li Binbin
Using the honeycomb waste selective catalytic reduction (SCR) denitration catalyst as raw material, a series of regenerated titanium tungsten powder products were prepared under normal temperature. The best reaction condition was screened according to the contents of impurities such as silicon, aluminum, arsenic, sodium, potassium and calcium, and the specific surface areas. The optimum reaction conditions are that the concentration of hydrofluoric acid is 2% and the reaction time is 3 h. A new denitration catalyst prepared from the regenerated titanium tungsten power had a higher denitration rate than that that of industrial titanium tungsten powder. The X-ray fluorescence (XRF), nitrogen adsorption BET (N
2
-BET), X-ray diffraction (XRD) and transmission electron microscope (TEM) were used to characterize the elemental content, surface properties, crystal structure and microscopic appearance. It is found that the catalyst prepared from the regenerated titanium tungsten powder has similar chemical composition, specific surface area, crystal structure and microstructure with that prepared from the industrial titanium tungsten powder, and still retains a part of the active V
2
O
5
. In addition, the regenerated titanium tungsten powder shows good catalytic stability and industrial prospects.
2020 Vol. 37 (3): 60-66,73 [
Abstract
] (
4207
) [
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1KB] [
PDF
4494KB] (
1186
)
67
Research Progress of Thermal Conductive Polymer Composites
Zhao Jingqi, Meng Fancheng, Shen Jingbo, Feng Yakai
With the rapid development of electronic information technology, the heat dissipation of electronic devices is facing severe challenges. It’s urgent to develop high-performance thermal conductive composites. Polymer composites have been widely used in the thermal conductive materials, due to its light weight, high strength and excellent flexibility. In this paper, the mechanisms of thermal conduction of polymer composites, thermal conductive fillers and influential factors of thermal conductivity were introduced. The research progress of improving the thermal conductive polymer composites by surface functionalization, hybrid particles, filler orientation and 3D interconnected structure was also summarized. The current problems in thermal conductive composites were summarized. Besides, the development direction of the thermal polymer composites in the future were prospected.
2020 Vol. 37 (3): 67-73 [
Abstract
] (
3654
) [
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1KB] [
PDF
892KB] (
2151
)
74
Research Progress of Ni-Based Materials for Flexible Solid-State Supercapacitors
Shang Mengyao, Huang Chengde
Flexible solid-state supercapacitors play an important role in the energy storage field of wearable electronic devices. Electrodes, as the key part of supercapacitors, determine the performance of energy storage devices. Nickel-Based materials possess the excellent electrochemical properties and the broad application prospects as electrode materials. In this review, nickel-based materials were classified into several categories based on chemical composition, and the latest progress in the electrode of nickel-based/metallic and nickel-based/nonmetallic materials for the flexible solid-state supercapacitors were highlighted. The challenges of nickel-based materials were briefly presented with some perspectives toward future development.
2020 Vol. 37 (3): 74-79 [
Abstract
] (
4855
) [
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1KB] [
PDF
871KB] (
1357
)
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