共查询到20条相似文献,搜索用时 15 毫秒
1.
G. Ya. Gerasimov 《High Energy Chemistry》2001,35(6):389-393
The efficiency of the electron-beam treatment of power-plant flue gases for the removal of sulfur and nitrogen oxides was examined as applied to the removal of dioxins from the gases. A kinetic scheme of the process was proposed. It involves gas-phase and liquid-phase degradation of dioxin molecules by OH radicals formed under the action of ionizing radiation on gas macrocomponents. It was found that gas toxicity due to dioxins decreased by an order of magnitude at radiation doses typical of the method. 相似文献
2.
电晕法烟气脱硫脱硝的测试问题 总被引:1,自引:0,他引:1
在电晕法烟气脱硫脱硝实验中发现,只有巧妙地设计测试方法,方能保证SO2和NOx浓度的测试结果的准确性和可靠性。本文报道了作者提出了取样烟气脱氨测SO2,用H2O2脱SO2测NOx等改进方法。 相似文献
3.
4.
The deoxygenation of a few diaryl‐phenylphosphine oxides, dimethyl‐phenylphosphine oxide, and 3‐methyl‐1‐phenyl‐3‐phospholene 1‐oxide was studied by phenylsilane, tetramethyldisiloxane (TMDS), and polymethylhydrosiloxane (PMHS) under conventional or microwave (MW) heating, in toluene or in the absence of any solvent at different temperatures. It was found that the deoxygenation with TMDS or PMHS under MW and solvent‐free conditions may be the method of choice and provides a green chemical approach. 相似文献
5.
Xiangyu Cui Wenbo Wang Mengcheng Du Delong Ma Xiaolai Zhang 《Molecules (Basel, Switzerland)》2022,27(14)
Soluble sulfur (S8) and insoluble sulfur (IS) have different application fields, and molecular dynamics simulation can reveal their differences in solubility in solvents. It is found that in the simulated carbon disulfide (CS2) solvent, soluble sulfur in the form of clusters mainly promotes the dissolution of clusters through van der Waals interaction between solvent molecules (CS2) and S8, and the solubility gradually increases with the increase in temperature. However, the strong interaction between polymer chains of insoluble sulfur in the form of polymer hinders the diffusion of IS into CS2 solvent, which is not conducive to high-temperature dissolution. The simulated solubility parameter shows that the solubility parameter of soluble sulfur is closer to that of the solvent, which is consistent with the above explanation that soluble sulfur is easy to dissolve. 相似文献
6.
Ralf Steudel 《Phosphorus, sulfur, and silicon and the related elements》2013,188(1-3):33-64
Abstract The preparation, structures, spectra and other properties of organic sulfane oxides, R2SnO (n=3,4), and dioxides, R2SnO2 (n=3,4), as well as of the homocyclic sulfur oxides SnO (n=6…10) and SnO2 (n=7, 12) are discussed. All compounds are sulf-oxides and contain two or more homonuclear S-S bonds. 相似文献
7.
First‐principles calculations (USPEX and CASTEP code) using plane‐wave pseudopotentials under the generalized gradient approximation functional of Perdew—Burke—Ernzerhof are performed to investigate the structural, electronic, and elastic properties of N2O4 and N2O5. 相似文献
8.
9.
A. A. Grechnikov A. N. Mogilevskii Yu. I. Fabelinskii 《Journal of Analytical Chemistry》2002,57(9):836-842
A method for the piezoelectric-resonance determination of gases under field conditions was developed. It is based on the use of a selective permeable filter in combination with time selection and repeated measurements of the sensor frequency. The proposed procedure significantly lowers the detection limit, improves the selectivity of analysis, extends the range of suitable adsorbents, and, to a great extent, separates the functions of sensitivity, selectivity, and reversibility in selecting particular adsorbents. 相似文献
10.
11.
Meng Zhao Bo‐Quan Li Hong‐Jie Peng Hong Yuan Jun‐Yu Wei Jia‐Qi Huang 《Angewandte Chemie (International ed. in English)》2020,59(31):12636-12652
The development of energy‐storage devices has received increasing attention as a transformative technology to realize a low‐carbon economy and sustainable energy supply. Lithium–sulfur (Li–S) batteries are considered to be one of the most promising next‐generation energy‐storage devices due to their ultrahigh energy density. Despite the extraordinary progress in the last few years, the actual energy density of Li–S batteries is still far from satisfactory to meet the demand for practical applications. Considering the sulfur electrochemistry is highly dependent on solid‐liquid‐solid multi‐phase conversion, the electrolyte amount plays a primary role in the practical performances of Li–S cells. Therefore, a lean electrolyte volume with low electrolyte/sulfur ratio is essential for practical Li–S batteries, yet under these conditions it is highly challenging to achieve acceptable electrochemical performances regarding sulfur kinetics, discharge capacity, Coulombic efficiency, and cycling stability especially for high‐sulfur‐loading cathodes. In this Review, the impact of the electrolyte/sulfur ratio on the actual energy density and the economic cost of Li–S batteries is addressed. Challenges and recent progress are presented in terms of the sulfur electrochemical processes: the dissolution–precipitation conversion and the solid–solid multi‐phasic transition. Finally, prospects of future lean‐electrolyte Li–S battery design and engineering are discussed. 相似文献
12.
系统研究了以KOH为结构导向剂,Y型沸石(HY和NaY)在水热条件下转晶为MER型沸石的行为.MER型沸石是硅铝比(Si/Al)在2~3之间且具有四种尺寸8元环孔道(3.1Å×3.5Å,2.7Å×3.6Å,3.4Å×5.1Å,3.3Å×3.3Å)的硅铝沸石分子筛,在小分子催化以及分离方面具有重要的潜在应用.传统水热法合成高结晶度MER型沸石需要7~10 d,将Y型沸石置于KOH的溶液中,经水热处理可在2 d内生成高结晶度的MER型沸石,而水热处理具有等价摩尔组成的无定形硅铝凝胶则得不到高结晶度MER型沸石的纯相.HY沸石可在100和150℃发生转晶,而NaY则只能在150℃发生转晶.KOH/SiO2比和H2O/SiO2比对Y型沸石的转晶行为有重大的影响,只有在最优KOH/SiO2比和H2O/SiO2比条件下才能生成高结晶度的MER型沸石.该转晶合成法显著缩短了MER型沸石的合成周期,对缩短其它有重大工业应用价值的沸石分子筛的合成周期有重要的借鉴意义. 相似文献
13.
14.
Summary. Two main types of binary systems with distinctive solubility behavior under sub- and supercritical conditions were used to
subdivide ternary water-salt systems into three classes. Characteristic features of solubility behavior and phase equilibria
in ternary water-salt systems of each class at temperatures above 200°C are discussed on the basis of available experimental
data and some conclusions obtained as a result of theoretical derivation of fluid and complete phase diagrams.
Corresponding author. E-mail: Valyashko@IGIC.RAS.RU
Received September 25, 2002; accepted (revised) November 28, 2002
Published online April 24, 2003
RID="a"
ID="a" Dedicated to Prof. Dr. H. Gamsjaeger on the occasion of his 70th birthday anniversary 相似文献
15.
16.
分别用1,2和3 mol·L-1的NaOH溶液,在不同的温度条件下对坡缕石进行了侵蚀实验。对反应后的固相产物进行了XRD和SEM分析,对浸出液中的金属阳离子进行了原子吸收光谱分析。讨论了反应温度和碱溶液浓度对碱溶后产物的影响。XRD和SEM结果表明,cNaOH≤2 mol·L-1时,坡缕石经碱溶液侵蚀后,可以生成蒙脱石和方沸石,其中反应温度的升高有利于方沸石的形成,碱溶液浓度的升高有利于蒙脱石的形成。当碱溶液浓度达到3 mol·L-1,反应温度为200 ℃时,最终产物为SiO2。浸出液的定量分析结果显示,坡缕石与碱溶液的反应过程中,Na+对八面体阳离子的置换具有选择性,置换顺序为:Al3+>Fe3+(Fe2+)>Mg2+。 相似文献
17.
Khodabakhsh Niknam Ali Reza Kiasat Foad Kazemi Abolghasem Hossieni 《Phosphorus, sulfur, and silicon and the related elements》2013,188(6):1385-1389
Aromatic nitro compounds can be conveniently reduced to the corresponding primary amines in the presence of S 8 under solvent-free conditions in excellent yields. Alumina supported NaOH catalyses this transformation. Chemoselectivity was observed in the reduction of the nitro group in the presence of phenol, carboxylic acid, aldehyde, and benzyl halide groups. 相似文献
18.
H. A. Soleiman F. M. Abd El-Latif M. A. Khalil I. H. Elazab 《Phosphorus, sulfur, and silicon and the related elements》2013,188(4):1001-1014
Pyrazolo-, pyrimidino-, isoxazolo-, thiozolo-, and g -lactam incorporating thienopyridazine has been synthesised by cyclocondensation addition reaction and cycloaddition reaction of hydrazine hydrate phenyl hydrazine, hydroxylamine hydrochloride, urea, thiourea, mercapto acetic acid and monochloroacetyl chloride. 相似文献
19.
本着降低生产成本,开发仪器功能,提高工作效率,建立了双柱切换-反吹技术-气相色谱法(内标法)同时测定汽油中含氧化合物与苯。考察色谱阀的切换时间,柱温等因素对结果的影响,确定了最佳操作条件,同时对方法的精密度和重复性进行验证。结果表明,含氧化合物和苯的相对标准偏差为0.05%~0.2%,加标回收率分别为98.8%和96.7%,同时测定汽油中含氧化合物和苯方法的建立,其分析结果与石化标准方法分析结果一致。 相似文献