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Combining the performance evaluation (activity, selectivity and stability) and the characterization of the catalysts (XRD, TPD, FTIR and the pore structure measure), it can be concluded that :(1)The activity of modified β is higher than MCM-22, but the selectivity of ethylbenzene is lower about 3% than that of MCM-22;(2)The mounts of diethylbenzene and the other by-products are higher 1.7 times and 1.5 times than these of MCM-22 respectively;(3)The catalytic performance of zeolite mixture is nearly equal to modified β, but the selectivity of ethylbenzene is higher about 0.5% than that of modified β;(4)The catalytic activity of zeolite is mainly correlated with the number of acid sites, strength and distribution, and the distribution of products is determined by the binding energy of ethylbenzene and the pore structure, while the stability of catalyst is affected by the amount of poly-ring aromatic alkylate and the pore structure.

以性能评价和特性表征(XRD、TPD、FTIR和孔结构测定)相结合的方式,对上述三种催化剂性能比较的结果表明:(1)改性的活性明显高于MCM-22,但乙苯选择性却低于MCM-22绝对差约3%;(2)改性(上二乙苯和其他副产物的生成量分别约为MCM-22上对应值的1.7和1.5倍左右;(3)混合型催化剂的性能与改性相仿,但乙苯选择性提高0.5%左右;(4)对乙苯合成,沸石催化剂的活性主要取决于其B酸中心数、酸强度及酸分布,产物分布则取决于催化剂表面的乙苯脱附能垒值和孔道结构,而稠环芳烃的生成量和催化剂孔道结构是影响催化剂稳定性的主要因素。

RESULTS: The hydrolyzed products were the main metabolites of trimebutine, and the main pathway of the metabolism occurred in the part of butanol.

结果:曲美布汀酯水解产物在代谢产物中是主要成分,其中醇部分的进一步代谢是主要的代谢途径。

The gasification efficiency increased and the molar fraction of H2 decreased with an increase in the reaction temperature. The decomposition of PVA was more complete at higher temperatures. At 24 MPa, 500℃ and 120 s, the TOC remove rate, the carbon gasification rate and the hydrogen gasification rate were up to 71.46%, 67.97% and 157.24% respectively. A change in the residence time had no significant effect on the molar fraction of gas production but an increase in the residence time could enhance the gasification efficiency of PVA. It was found that the intermediates were mainly alkane, cycloparaffin, aromatic hydrocarbons, and low-molecular weight acids. It was supposed that PVA was degraded into small molecules through breaking of C-C bonds. Parts of the molecules were converted into H2, CO, CH4 and CO2 while some was converted into aromatic hydrocarbons.

过程探索发现:反应温度的升高能提高PVA气化效率,但气体产物中H2的含量随反应温度的升高有所下降;随着反应温度的升高,PVA分解趋于彻底,在压力24MPa、温度500℃、停留时间120s的条件下,TOC去除率、有机碳气化率和氢气化率分别达到71.46%,67.97%和157.24%;停留时间的变化对气体产物含量没有明显的影响,但延长停留时间能提高PVA的气化效率;PVA气化反应中间产物主要为链状烷烃、环烷烃、芳香烃及小分子酸,根据中间产物出现的顺序推测PVA的降解为由C-C键断裂形成小分子物质,这些小分子物质一部分转化为H2,CO,CH4和CO2,一部分形成难降解的芳香族化合物。

Most of DDT degraded to DDE in river and degraded to DDD in sea water.

丰水期河水中DDT的降解产物主要为DDE,而海水中DDT的降解产物主要为DDD。

There are different methyl branch structures correlated with isomerous nonyl of NP in the alkyls. The primary metabolites from the dominant bacteria experiment have alkyl phenols and benzene acetic.

研究结果表明,活性污泥降解壬基酚的初级代谢产物主要为C4~C6烷基取代苯酚,烷基链的结构差异与其母体壬基的异构方式有关,烷基上的支链主要为甲基;优势降解菌群代谢壬基酚的初级产物除烷基苯酚外,还有苯乙酸等。

Serotonin (5-HT), its precursors tryptophan and 5-hydroxytryptophan (5-HTP), major metabolites 5-hydroxyindoleacetic acid (5-HIAA); and 3-methoxy-4- hydroxyphenylethylene glycol , homovanillic acid , the respective major metabolites of noradrenaline and dopamine were measured by a method of HPLC.

应用高效液相色谱法测定其中5—羟色胺(5-HT)系列代谢物:色氨酸、5-羟色胺酸(5-HTP)、5-HT、5-羟吲哚乙酸(5-HIAA);多巴胺的主要代谢产物3-甲氧基-4-羟基苯乙酸;去甲肾上腺素的主要代谢产物3-甲氧基-4-羟基苯乙二醇等。

The result shows that the greater positive influence is from the dissolutions of carotene and browning reaction,next come the cembratriendid compounds and hypoglycemia compounds,while the negative influence is from indoles,toluene and some aldehydes,and the negative influence from...

结果表明,对评吸结果影响较大的是胡萝卜素降解产物类和棕色化反应产物类;类西柏烷类和苯丙氨酸类中性致香物质的贡献较小;负面影响较大的成分主要集中在吲哚、甲苯及一些醛类上,类胡萝卜素降解产物类和棕色化反应产物类中的个别成分也有一定的负面影响。

The analysis of X-ray diffraction and scanning electron microscope energy dispersion spectra show that the primary hydrolysis products of antimony pentachloride and its hydrochloric acid solution are amorphous antimony oxide rather than SbO2Cl.

X射线衍射和扫描电镜能谱分析表明:五氯化锑及其盐酸溶液的初始水解产物不是SbO2Cl,而是一种非晶态锑氧化合物;随着水解母液酸度的降低,五氯化锑溶液水解产物陈化五天后的晶型由非晶态向晶态变化;五氯化锑溶液水解产物经无水乙醇洗涤后水解产物仍为非晶态,而经蒸馏水洗涤虽主要为非晶态,但有少部分结晶的Sb2O5·4H2O晶体存在。

Database of physical and chemical properties for solid wastes were constructed through investigation for single typical component and their mixture of solid wastes. The particulate trajectory model and heat transfer model were developed, based on the studies of Characteristics of solid wastes movement and heat mass transfer in rotary kiln. Pyrolysis experiments of solid wastes in lab and pilot scale rotary kiln pyrolyzers were performed. Mechanism of pyrolysis for typical solid wastes was analyzed. The characteristics of pyrolytic products, such as physical and chemical properties, composition and combustibility, etc, were investigated. A neural network model for the prediction of yields and properties of pyrolysis products was developed. Then, the potential applications of pyrolytic products and the substitution of pyrolytic fuels for corresponding commercial furls were investigated. The optimization of energy recovery and utilization for different wastes through pyrolysis was analyzed.

通过对典型固体废物组分及其混合物特性的分析,建立了固体废物的化学特性分析数据库,并据此进行了物理分类;对固体废物在回转窑内的运动和传热特性进行了研究,建立了固体物料的随机颗粒滚动理论模型和传热模型;在小型和中试回转式热解炉上进行了实验;对各种典型固体废物在回转窑内的热解机理和主要热解产物的性质进行了研究;利用神经网络等方法建立了各典型固体废物的热解产物的产率及特性的数学预测模型;对固体废物热解产物的物性、成分、燃烧特性等开展了研究,分析了其与现有商业燃料匹配的可能性;对热解产物的多种应用性能进行了研究,对不同废物热解中的能源回收和利用进行了优化分析。

But when Fe/D113 precursor is pyrolysed in the range of 400-700℃, the crystal structure of the iron particle is different. The products are mainly iron oxides andα-Fe as Fe/D113 precursor pyrolysed at 500℃, and as the pyrolytic temperature increases to the range of 600-700℃,α-Fe and Fe_3C are observed. Meanwhile, Al_2O_3、MgO、MgAl_2O_4 were observed in Al/C, Mg/C, Al-Mg/C which were prepared from D113 resin at 1000-1300℃.

而在同样的条件下热解载铁树脂(Fe/D113),热解产物中铁的晶体结构与热解温度有关,400℃热解产物为铁的氧化物;500℃热解产物为体心立方结构的单质铁;600-700℃的热解产物为bcc单质铁和铁的碳化物(Fe_3C)。1000-1300℃热解含Al、Mg及Al-Mg的D113树脂制得的Al/C、Mg/C、Al-Mg/C材料中Al、Mg主要以Al_2O_3、MgO、MgAl_2O_4形式存在。

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The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应,而且减少跟风的可能性。

The new PS20 solar power tower collected sunlight through mirrors known as "heliostats" to produce steam that is converted into electricity by a turbine in Sanlucar la Mayor, Spain, Wednesday.

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