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MoO3/Al2O3催化剂上MoO3的脱附平衡和流失速度 总被引:2,自引:0,他引:2
分别测定了在氮,水气氛下MoO3自MoO3/Al2O3催化剂上脱附的平衡数据。发现尽管MoO3和Al2O3存在着强的化学作用,但气固平衡关系仍然可用Freundlich方程式描述。讨论了钼升华流失速度方程式与Freundlich式的关系。发现在氮水混合气流中,钼的流失总速度可以用它们单独存在时流失速度线性加和来表示。给出了水分压对流失速度影响的级数值。这一综合速度方程式经简化后,可以用于工业过程中钼流失数据的估算。 相似文献
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测定了氯化汞水溶液在活性炭上的吸附平衡数据。证明氯化汞在液固两相中的平衡关系,可用Langmuir方程式拟合。 文中介绍了该方程式的两方面应用:①用微量氯化汞溶液也能制出合格的氯化汞-活性炭催化剂。②用活性炭脱除废水中氯化汞时所需活性炭的最小用量。 相似文献
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刘大壮 《化学反应工程与工艺》1993,9(2):190-196
在235℃下,研究了浸渍法制取的碘-活性炭催化剂中碘的升化流失速率。所得数据可以良好地用下述升华流失速率方程式拟合:常数λ=7.1;k=0.438;n=1.76。在 V≤1时,碘在气固两相之间接近平衡,此式可简化为:■ 相似文献
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固相吸附剂在溶液中吸附特性的研究 总被引:3,自引:0,他引:3
研究了固相吸附剂活性炭在醋酸溶液和亚甲基蓝溶液中的吸附特性,在吸附质浓度较低时,吸附属单分子层吸附,用Langmuir吸附方程式对吸附作用进行了数学表征,并利用溶液吸附法测定了活性炭的比表面积。 相似文献
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一种强酸型载银离子交换树脂除碘性能的研究 总被引:1,自引:0,他引:1
制备了一种大孔交联的强酸型离子交换树脂,并将其负载上不同含量的银离子,制备成吸附醋酸中碘离子的吸附剂。该吸附剂的除碘能力随着液时空速的升高而降低。液时空速越高降低得越明显。树脂载银量的提高对提高除碘能力有促进作用,尤其是在载银量较低时效果更明显。该吸附剂在30℃时除碘效果最好,温度升高会造成除碘能力逐渐下降。 相似文献
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以具有代表性的放射性单质碘和甲基碘作为吸附质,考察了银基分子筛对其的静态吸附容量和吸附热、动力学,通过SEM、EDX mapping、XPS测试材料的微观形貌、元素组成,对吸附机理进行了分析。结果表明,该材料在常温下对单质碘和甲基碘吸附容量分别可达1 000,380 mg/g,对甲基碘的吸附过程符合准二级动力学方程和Langmuair吸附等温模型。银基分子筛通过化学吸附处理痕量的放射性碘,而对于较高浓度的放射性碘主要的吸附方式为物理吸附。 相似文献
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研究了腐植酸对硒(Ⅳ)的吸附行为,探讨了固液比、时间、pH值、浓度、温度对硒吸附的影响。研究发现物理吸附与化学吸附并存,其吸附平衡服从Freundlich 模型,导出Freundlich的吸附等温方程式q=kc1.02,并推出吸附热为△H=-17.8kJ/mol。 相似文献
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Single- and two-solute adsorption breakthrough curves of lysozyme and bovine serum albumin on the cation exchanger SP-Sepharose Fast Flow were studied in this paper. A simplified mathematical model was used to model these data. Input parameters of the model such as equilibrium and kinetic parameters were estimated from single-solute batch experiments. For single-component adsorption in a fixed-bed, the breakthrough behaviour of lysozyme was well modelled. In contrast, significant deviations were observed between the measured and theoretical breakthrough curves of albumin. It was shown that the equilibrium parameters measured from batch experiments failed to account for the behaviour of albumin in the fixed-bed. The bisolute system consisting of the simultaneous adsorption of lysozyme and albumin was also modelled using the same set of parameters derived from single-solute batch experiments. Deviations were observed between the measured and theoretical breakthrough curves for both proteins, indicating that the effects of multicomponent equilibria and kinetics must be taken into consideration in parameter estimation. 相似文献
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The XG equation, which is developed by us previously for describing the adsorption equilibrium of pure vapor on activated carbon, is extended to multi-component system. Verified by experimental data, the extended XG equation was found to be more successful in predicting the adsorption equilibrium of vapor mixture on activated carbon than the extended Langmuir equation, the extended BET equation and the ideal adsorbed solution theory (IAST). 相似文献
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采用水蒸气活化法制备得到微孔发达的椰壳活性炭,并研究其对肌酐的吸附性能。以850℃活化所得微孔率最高的活性炭为吸附剂,考察了活性炭投加量、吸附时间、溶液pH值及肌酐初始质量浓度对肌酐吸附性能的影响,并采用准一级、准二级动力学方程对实验数据进行拟合处理。结果表明,制备所得4种椰壳活性炭对肌酐均有较强的吸附能力;微孔率越高,吸附量越大;37℃下,椰壳活性炭对肌酐的吸附平衡时间为6 h,平衡吸附量达到97.88 mg/g;酸性环境更有利于肌酐吸附;平衡吸附量随肌酐初始质量浓度增加而升高;吸附过程符合准二级动力学模型,以化学吸附为主。 相似文献
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From a number of ion-exchange resins and adsorbents,a macro-pore weak-base type anionion-exchange resin,D354,was selected for the separation of lactic acid.Experimental data showedthat simultaneous ion-exchange and physical adsorption existed in the lactic acid-D354 system.Amathematical model was suggested to simulate the experimental data.Also,the effects of inorganicsalts on the ion-exchange.equilibrium were studied.The difference in ion-exchange equilibrium be-tween DL-and L-lactic acid was observed. 相似文献
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《分离科学与技术》2012,47(15):2358-2365
Adsorption of atrazine on nanoporous polymeric adsorbents, PAD 400 and PAD 610, was investigated. The effect of particle size, pH, ionic strength, and temperature along with kinetic, equilibrium, and thermodynamic studies reveal the efficiency of PAD 400 with a higher adsorption capacity than PAD 610. The equilibrium data obey the Freundlich isotherm and the kinetic data were well described by the pseudo-second-order model. Spontaneous, endothermic, and random characteristics of the process were confirmed by thermodynamic analysis. 相似文献