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EC-KitY: Evolutionary computation tool kit in Python with seamless machine learning integration
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DOI：10.1016/j.memsci.2023.121588.png)
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摘要
En 中文
Co-aromatization of methane (CH4) and ethylene (C2H4) over a membrane reactor (MR) using hydrogenpermeable DDR zeolite membrane packed with Zn/HZSM-5 catalyst was studied for the first time. The adopted DDR zeolite membrane showed high H2 selectivity for separations of binary H2/CH4 and trinary H2/CH4/ C2H4 mixtures. Typically, the selectivities for H2/CH4 and H2/C2H4 were 40 and 29 for trinary mixture separation at room temperature, respectively. The effects of reaction temperature, methane-ethylene feed ratio, space velocity and H2 removal on the membrane reaction performance were investigated systematically. The membrane reactor can achieve 8.43% methane conversion with BTX selectivity of 80.68% within 1 h under the optimal reaction conditions (reaction temperature 450 degrees C, methane-ethylene feed ratio 3:2, weight hourly space velocity (WHSV) 800 mL/(gcat h), sweep helium flow rate 15 mL/min). Compared to a fixed-bed reactor (FBR) with similar reaction condition, the achieved methane conversion and BTX yield were improved by -42% and -10%, respectively, due to the timely removal of H2 from the reaction system. The membrane also showed good stability, and the methane conversion maintained at about 7% for about 30 h. After burning the coke formed on the catalyst, the initial reaction performance can be restored, showing a good regeneration ability.
Keyword:
Methane
Co-aromatization
DDR zeolite Membrane
Hydrogen separation
Membrane reactor
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IF:
9
论文数:
2.1W
被引数:
9.4W
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