{'fraction_non_alphanumeric': 0.01276207839562443, 'fraction_numerical': 0.018231540565177756, 'mean_word_length': 4.967391304347826, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
Accurate Fit and Thermochemical Analysis of the Adsorption Isotherms of Methane in Zeolite 13X

The recovery of methane from landfill gases and coal mines has become of the utmost importance because methane has a global-climate warming potential much higher than that of carbon dioxide. Zeolite 13X is widely used for the separation of methane and carbon dioxide from such sources. Accurate fits of the adsorption isotherms of methane in zeolite 13X are required for the rigorous simulation of that separation. In this work, a generalized statistical thermodynamic adsorption (GSTA) model has been used to obtain a very accurate correlation of a published set of adsorption isotherms of methane in zeolite 13X that were measured from 120 K to 273 K over the pressure range 0.07 Pa to 12.2 MPa. In contrast, none of five traditional adsorption models was capable of fitting these isotherms. A thermochemical interpretation of the correlation is provided and predictions for the isosteric heat of adsorption are made, which turn out to be in excellent agreement with the available experimental data.