英语翻译2.2.4.Sorption experimentsPhysisorption experiments were

英语翻译
2.2.4.Sorption experiments
Physisorption experiments were done on an ASAP 2100 physisorption apparatus to obtain isotherms of N2 adsorption and BET surface areas of the samples.Sorption of water,methanol,benzene,or binary mixtures of the above-mentioned adsorbates were studied at room temperature with static weighing.Samples (ca.0.20 g,after being pressed,crushed,and sieved to 20–40 mesh) were heated at 250°C for 4 h and put in a desiccator containing a saturated solution of NH4NO3,pure ethanol,or benzene for sorption of water,ethanol,or benzene,respectively,and containing water–ethanol or water–benzene mixtures (contained in different beakers) for sorption experiments.Accurate weighing was done before and after sorption to obtain uptake data.
2.3.Catalytic evaluation
Catalysts (0.12 g) of 20–40 mesh were placed in a U-type stainless steel reactor packed with quartz wool.A thermocouple was attached to the external surface of the reactor at the catalyst bed to record reaction temperatures.After the catalyst was pretreated at 250°C in flowing air for 1 h,the temperature was lowered to 100°C and then the reaction started.Benzene vapor was introduced into the reactor by using air as carrier gas that was flowed through a benzene-containing bubbler,which was placed in an ice bath.Another flow of air was used to dilute the reactant.By adjusting the two flow rates (controlled by a flow controller),the concentration of benzene in the reactant was adjusted to be 0.6–3.5 vol%.Under our reaction conditions,both internal and external diffusional resistances have been eliminated if the reaction temperature was above 200°C,as confirmed by experiments with different amounts and different sizes of catalysts.
Analyses of benzene were done on-line with an HP 5990 A GC gas chromatograph (GC) equipped with a thermal conductivity detector (TCD),an HP 3395 integrator,and a 30 m×0.32 mm×0.25 μm HP-5 capillary column.The downstream gas was connected to another HP 5990 A GC with a TCD and a 25 ft Carboxen 1000 packed column for analyses of O2,N2,CO,and CO2.Helium was used as carrier gas for all analyses.Concentrations are determined by external standard methods.Relative errors of these GC analyses are within 5%.At each temperature or flow rate,analyses of reaction products were taken at a time-on-stream of 30 min.
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2.2.4.吸附实验
物理吸附试验尽快与您做了2100年物理吸附仪对N2的吸附和BET表面积的样品“获取等温线.吸附的水,甲醇,苯,或上述吸附质研究了二元混合物在室温静态称重温度.样品（约0.20克,被按下后,粉碎,过筛,并以20-40目）在250℃,加热4小时ç被放在一个载有一吸附硝酸铵,纯乙醇或苯饱和溶液干燥器水,乙醇,或苯,分别载有水或水和乙醇,苯混合物（在不同的烧杯内）的吸附实验.准确称量完成前,后吸收吸附获取数据.
2.3.
催化剂（0.12克20-40目）被安置在一个U型不锈钢石英羊毛包装反应堆.热电偶又是挂在催化剂床反应器的外表面,记录反应温度.预处理后的催化剂在250℃时为1小时在流动的空气,温度降至100 ° C,然后在反应开始.苯蒸气引入采用空气为载气流通,这是一个苯含起泡,这是放置在冰浴一年的反应堆.另一种用空气流稀释反应物.通过调整两种流率（由流量控制器控制）,对苯的反应物浓度调整为0.6-3.5％,第二卷.反应条件下澳,内部和外部的扩散电阻都取消了,如果反应温度高于200 ° C的有不同大小和不同金额的催化剂当日之实验.
苯的分析,做一个与惠普5990气相色谱气相色谱仪（GC）中有热导检测器（TCD检测装置）,集成的HP 3395上线,一个30米× 0.32毫米× 0.25微米的HP - 5毛细管柱.下游天然气连接到另外一个是惠普5990与TCD和一25英尺Carboxen 1000包装为02柱气相色谱分析,氮气,一氧化碳,二氧化碳和.采用氦载气为所有测试.水平是由外部的标准方法.争论的气相色谱分析,相对误差在5％以内.在每一个黄金温度,流速,分析反应产物在时间上的30分钟流措施.