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运用Langmuir等温线方程和理想吸附溶液理论(IAST)两种方法计算了SAPO-34在混合气体中的单个物种表面浓度,并对比了计算值与实验值的吻合程度.考察了两个二元混合体系,分别为80 oC的甲醇和二甲醚以及25 oC的二甲醚和乙烯混合气,发现IAST计算值在实验压力范围内均与实验结果吻合;但是Langmuir理论计算值仅在酸性位覆盖率低于1/3时与实验值吻合较好,随着压力增加严重偏离实验值,而且Langmuir理论不能描述随压力增加低饱和吸附量物种覆盖率降低的现象.因此,针对包含不同饱和吸附量组分的混合气,Langmuir理论仅适用于描述表面浓度低时的反应动力学,当表面浓度高时应该采用IAST方法.
The Langmuir isotherm equation and ideal adsorption solution theory (IAST) were used to calculate the single species surface concentration of SAPO-34 in the mixed gas and the calculated values agree well with the experimental values. The effects of two binary mixtures System respectively, methanol and dimethyl ether at 80 oC and mixtures of dimethyl ether and ethylene at 25 oC showed that the IAST calculated values agree well with the experimental results within the experimental pressure range; however, the calculated Langmuir values are only within the range of acidity coverage Below 1/3, the experimental data agree well with the experimental data, and the Langmuir theory can not describe the decrease of species coverage with the increase of pressure. Therefore, The Langmuir theory is only applicable to the reaction kinetics when the surface concentration is low. The IAST method should be used when the surface concentration is high.