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Current Issue
2014 Vol.31 Issue.1,
Published 2014-01-15
Article
Article
1
Preparation of Ordered Mesoporous Carbon-Based Solid Acid Catalyst and Its Use for Synthesis of Bisphenol A
SHAN Wen-Bin, DONG Xiu-Qin, ZHANG Min-Hua
The novel ordered mesoporous carbon-based solid acid catalyst, possessing highly ordered mesoporous channel structure, high density of —SO
3
H groups, was prepared by softtemplate method. The catalysts were characterized by N
2
adsorptiondesorption, X-ray powder diffraction, transmission electron microscopy, EDX spectroscopy and acid-base titration. The effects of carbonization temperature on mesoporous porous structure, surface acidity and catalytic performance of mesoporous carbonbased solid acid catalysts were investigated. The experimental results showed that the optimal carbonization temperature was 500 ℃ and the mesoporous carbonbased solid acid catalyst carbonized under 500 ℃ contained highly ordered mesoporous channel structure and high acid density after sulfonation. The resulting catalyst was applied to the synthesis of bisphenol A from condensation of acetone with phenol and showed significantly higher activity than several solid acid catalysts(001×7, D072, Amorphous carbonbased solid acid). It can be clearly seen that the ordered mesoporous carbonbased solid sulfonic acid catalyst is a novel efficient solid acid catalyst and can be applied to the area of bisphenol A production.
2014 Vol. 31 (1): 1-7 [
Abstract
] (
1573
) [
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1KB] [
PDF
1833KB] (
2083
)
8
Experimental Study on Preparation of Propene by Coupled Reaction of Methanol and Pentene
HU Hao, GUO Wen-Yao, LUO Man, XIAO Wen-De
The effects of reaction temperature, space-time and feeding ratio on the methanol-pente-ne coupled reaction were investigated over H-ZSM-5 catalyst in an isotherm fixed-bed reactor. The appropriate reaction temperature is 420—500 ℃, within this range the conversion of methanol can reach 100%. Rising temperature can enhance the conversion of methanol and propene selectivity effectively, and also reduce generation of by-products, which are alkanes and aromatics. The space-time won’t influence the conversion of methanol. When it is decreased, the product distribution is enhanced effectively. The limit range is above 5 (g·h)/mol, otherwise the reaction residence time is too short for propene yield. The byproducts are reduced by coupling reaction compared with either separated feed. When the ratio of methanol to pentene is increased, the propene selectivity is enhanced while the conversion of pentene is lessened. The by-products are reduced to minimum when the ratio is 2.
2014 Vol. 31 (1): 8-13 [
Abstract
] (
1663
) [
HTML
1KB] [
PDF
1536KB] (
1759
)
14
Synthesis of Propylene Carbonate in the Presence of Catalysts of N,N’-Dialkylimidazolium-Based Ionic Liquids
GAO Ge, JIN Hai-Bo
The synthesis of propylene carbonate from carbon dioxide and propylene oxide was studied using three kinds of ionic liquids(［BMIM］Br, ［BMIM］BF
4
, ［BMIM］PF
6
) as catalysts. The experimental results showed that ［BMIM］Br, ［BMIM］BF
4
perform well and the presence of zinc bromide could improve significantly the conversion of propylene oxide in reaction process. The yield and selectivity of PC could be over 98% and 100% after 1 h, respectively, with 2 mol propylene oxide, 0.25% catalyst of ［BMIM］Br and 0.05% zinc bromide under 1.5 MPa at 120 ℃. The catalyst showed a good catalyzing performance on the above conditions after it was used four times, as the yield of PC was always over 92% and selectivity 100%.
2014 Vol. 31 (1): 14-18 [
Abstract
] (
4132
) [
HTML
1KB] [
PDF
1698KB] (
2281
)
19
Dehydrogenation of Methylcyclohexane over Pt-Co-La Catalysts Supported on Pyrolytic Waste Tire Char
YANG Ying, YE Hong-Li, ZHANG Cui, LIU Shuang-Xi
In the present work, the Pt-Co-La catalysts supported on pyrolytic waste tire char (PTC) were prepared by impregnation method. The loading of Pt is 0.2%, Pt-Co-La atomic ratio is 1∶1:
x
(
x
=1—4). The characterization of N
2
adsorptiondesorption, H
2
-TPR and pulse CO chemisorption results showed that the addition of a moderate amount of La to the Pt-Co bimetallic catalyst was beneficial to reduce Pt and Co, and improve their dispersion. The activity of the catalysts for dehydrogenation of methylcyclohexane（MCH）at 300 ℃ was investigated. The results suggest that trimetallic catalysts 1Pt-1Co-
x
La/PTC(
x
=1—3) exhibited the high activity, compared with Pt, Pt-Co and Pt-La supported on PTC.
2014 Vol. 31 (1): 19-23 [
Abstract
] (
2348
) [
HTML
1KB] [
PDF
1260KB] (
1688
)
24
Synthesis of 5-Acetylacetamidobenzimidazolone
ZHANG Zhen-Yu, ZHANG Jing, SHEN Hai-Jiao, MA Jian-Yu, QU Hong-Mei
5-aminobenzimidazolone was prepared from 5-nitrobenzimidazolone by hydrazine hydrate reduction. This method is mild, safe and environmentally friendly. The effect of solvents on the preparation of 5-acetylacetamidobenzimidazolone was studied. When ethyl acetate was used as solvent in this reaction, 5-acetylacetamidobenzimidazolone was synthesized by the reaction of 5-amino benzimidazolone with diketene, the yield was 89.3%.
2014 Vol. 31 (1): 24-32 [
Abstract
] (
1604
) [
HTML
1KB] [
PDF
1052KB] (
1794
)
28
Synthesis, Characterization and Application of the New Graphene-Pyrrolidine Materials with Ag Nanoparticles
PENG Xiao-Jun, YUAN Yang, GAO Yuan, ZHANG Feng-Bao
Functionalized by cycloaddition reactions, the multi-sulfhygryl graphene-based nanomaterials were prepared. The nature of the sulfhygryl group made it easy to react with single metallic sliver nanoparticles. The distribution of the metal nanoparticles was available in TEM observation. XPS analysis showed the element content of the final product, the nucleation model and the valence state of single metallic silver. Through the catalytic reduction reaction of
p
-nitrophenol, the catalytic property of final product was verified.
2014 Vol. 31 (1): 28-32 [
Abstract
] (
1898
) [
HTML
1KB] [
PDF
1531KB] (
1662
)
33
Measurement and Correlation of the Solubility of 4-tertButylphenol in NaCl Solution
YUE Jin-Cai1, ZHU Nana1, LIU Xian-Hong2, LI Ming1, ZHENG Shi-Qing1
The solubility of 4-tert-butylphenol(4-TBP) in water, 5%, 10%, 15% and 20% NaCl solution at 293.15—353.15 K were determined by equilibrium method. The results showed that the solubilities of 4-TBP in above mentioned 5 solvent systems increased with increasing temperature, and decreased with the increasing concentration of sodium chloride solution. The experimental data were correlated with ideal solution equation, Apelblat equation and Yaws equation, respectively. The total average relative errors were 2.08%, 1.96% and 2.00%, respectively. The results showed that ideal solution model, Apelblat equation and Yaws equation could well correlate the solubility data of 4-TBP, and the three models also can be applied to the ternary system containing electrolytes.
2014 Vol. 31 (1): 33-37 [
Abstract
] (
2881
) [
HTML
1KB] [
PDF
1272KB] (
1696
)
38
Preparation of Ibuprofen-Nicotinamide Cocrystal and Its Solubility Measurement
SHEN Zhi-Ming, XIE Chuang, DU Wei, YIN Qiu-Xiang
Large-Scale preparation of ibuprofen-nicotinamide cocrystal was successfully achieved via solution crystallization in ethanolwater mixture with ethanol to water ratio ranging from 1.82 to 7.11. The cocrystal product was verified by PXRD and DSC analyses. In the valid range of ethanol to water volume ratio, the yield of cocrystal reached the maximum of 76.31% at 2.76. To understand this solution cocrystallization process in the solvent mixture, the solubility of ibuprofennicotinamide cocrystal in ethanol-water mixture were measured using gravimetric method from 278 K to 303 K. It was found that the solubility increased monotonically with increasing temperature and increasing ethanol to water volume ratio. Finally the solubility data was correlated using Apelblat equation.
2014 Vol. 31 (1): 38-42 [
Abstract
] (
2578
) [
HTML
1KB] [
PDF
1432KB] (
2043
)
43
A Method for Measuring Concentration Field in the Cyclone with Two-Beam Gamma Ray
LIU Xiao-Cheng, SONG Jian-Fei, YAN Chao-Yu, CHEN Jian-Yi, WEI Yao-Dong
A method for measuring the concentration field in the cyclone with two-beam gamma ray has been put forward based on the characteristics of concentration distribution in the cyclone. The model contains the undetermined coefficients (
k
and
ρ
R
), which can be calculated from the only two path average concentrations that are measured by gamma ray device. The model was discussed with previous literature data for its reasonable. Also the experiment was carried out on the diameter 260 mm cyclone for measuring path average concentrations by
137
Cs radioactive source. The calculated results was compared with previous literature, the curves are agreement. So the two-beam gammaray method could be used in measuring and monitoring the concentration distribution in the cyclone.
2014 Vol. 31 (1): 43-47 [
Abstract
] (
1384
) [
HTML
1KB] [
PDF
1502KB] (
2392
)
48
Experimental and Theoretical Research on Direct-Contact Heat Transfer Between Liquid Drops and Vapor
LIU Tong, WANG He, LUO Yi-Qing, YUAN Xi-Gang
A theoretical study on the direct-contact heat transfer between drops and vapor has been carried out. A mathematical model is proposed to calculate the heat transfer rate. And an experiment of direct-contact condensation of steam on water sprays with a full cone nozzle at different pressures is performed to test the mathematical model. Good agreement between theory and experiment is obtained. The variation law of overall heat transfer coefficient with pressure of nozzle is presented.
2014 Vol. 31 (1): 48-52 [
Abstract
] (
1590
) [
HTML
1KB] [
PDF
1588KB] (
1641
)
53
Effect of Physical Aging on Gas Permeation Properties of Poly［1-(4-trimethylsilyl)phenyl-2-phenylacetylene］ Membranes
HU Yan-Ming-1, HU Yan-Ming1, GAO Ke-Ke1, ZHANG Cong-Zheng1, LI Zhan-Sheng1,Masuda tooshio2
Poly［1-(4-trimethylsilyl)phenyl-2-phenylacetylene］ (PTMSDPA) membranes were prepared by solution-casting method with thickness ranging from 33 μm to 112 μm to study the effect of aging on their gas permeability. The gas permeability of these membranes decreased during storing due to physical aging, which could be restored by immersing the membrane in methanol. The decreasing rate of gas permeability accelerated at high storing temperature, and the reduction of gas permeability became greater as the thickness of the membrane decreased. The storing atmosphere did not affect the gas permeability changing tendency of the membrane. The decrease of gas permeability was largely due to the decrease of diffusivity coefficient (
D
), while the solubility coefficient (
S
) did not change during storage.
2014 Vol. 31 (1): 53-56 [
Abstract
] (
2200
) [
HTML
1KB] [
PDF
1557KB] (
1665
)
57
Evaluation and Optimization of Key Operational Parameters for Anaerobic Fermentation Biohydrogen Production Dark
LI Chao1, LI Xin-Gang1, 2 , SUI Hong1, 2
Anaerobic dark fermentation experiments were performed in microcosms to produce biohydrogen from glucose. The influences of pH, concentration of NH
+
4
, Fe
2+
and Mg
2+
, and the temperature and duration of preheating on the hydrogen production efficiency were evaluated via single factor experiments. The optimal conditions were concluded to be preheating for 40 min at 90 ℃ followed by dark fermentation at pH 8.0 with 3.00, 0.10 and 0.03 g·L
-1
of (NH
4
)
2
SO
4
, FeSO
4
and MgSO
4
, respectively. Under these conditions, 630 mL high quality H
2
(purity: 0.80) was harvested cumulatively with a yield of 2.62 mol H
2
per mol glucose. The overall results suggest that anaerobic dark fermentation is an effective approach for biohydrogen generation.
2014 Vol. 31 (1): 57-62 [
Abstract
] (
2490
) [
HTML
1KB] [
PDF
1797KB] (
1538
)
63
The Development of Electrode Materials for Supercapacitors
XIE Xiao-Ying, ZHANG Chen, YANG Quan-Hong
As a fascinating environmental friendly energy storage and conversion system, supercapacitor possesses many advantages over other energy storage devices, which bridges the gap between traditional capacitors and Lithium-ion batteries, and could effectively provide a green solution for the energy and environmental crisis such as fossil fuel depletion and pollution. Following a brief introduction of the fundamental principle, application, current status and characteristics of the supercapacitors, we review the research development of electrode materials for supercapacitor with an emphasis on carbon-based materials.
2014 Vol. 31 (1): 63-71 [
Abstract
] (
5011
) [
HTML
1KB] [
PDF
1977KB] (
2435
)
72
Research Progress of Solid Adsorbents for CO
2
Capture
WANG Sheng-Ping, SHEN Hui, FAN Sha-Sha, MA Xin-Bin
Excessive emissions of greenhouse gases such as carbon dioxide, have caused serious impact on climate and environment due to the combustion of fossil fuel. Solid adsorbents have attracted growing interests in fields of carbon dioxide capture technology owing to their unique advantages such as easy processing, re-usability, small loss of raw materials. In this paper, advantages and disadvantages of the solid sorbents, which have developed in recent years, are discussed. According to the difference of adsorption temperatures, the sorbents could be divided into three types: the low temperature, medium temperature, high temperature. This paper focuses on the adsorption properties and modification methods of high temperature calcium-based sorbents considering high temperature absorption of carbon dioxide. And calcium-based sorbents is the most ideal high temperature adsorbent due to its high adsorption capacity, wide-distribution of raw materials and low costs.
2014 Vol. 31 (1): 72-78 [
Abstract
] (
1576
) [
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1KB] [
PDF
1440KB] (
2234
)
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