{'fraction_non_alphanumeric': 0.02261553588987217, 'fraction_numerical': 0.010816125860373648, 'mean_word_length': 4.655555555555556, '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}}
Characterization of Coke on Co-Mo/HZSM-5 Catalyst for Methane Dehydro Aromatization in the Absence of Oxygen

The catalytic performance of Co Mo/HZSM 5 catalyst for methane dehydro aromatization was investigated and the coke formed during the reaction at different space velocity was studied by TG method. The coke formation rates calculated based on the carbon balance of reaction are in reasonable agreement with those measured by TG method. Under all the reaction conditions used in this work, the total amount of coke formed is less than 5%. Based on the analysis of TG curves, it is suggested that the coke is dispersed on/in Co Mo/HZSM 5 catalyst, and that the coke formed at high space velocity prefers to deposit on the external surface, while it preferentially deposits in the zeolite channels at low space velocity. At the space velocity of 3?000 ml/(g h), the kinetics of coke combustion fits in first order reaction with respect to coke amount, and the corresponding activation energy is about 140 kJ/mol.