Improved Performance of W/HZSM-5 Catalysts for Dehydroaromatization of Methane

摘要/Abstract

摘要： Abstract: The dehydroaramatization of methane over W-supported ZSM-5 with varying degrees of Li+ ion-exchanged catalysts was studied with and without oxygen at 1073 K and atmospheric pressure. Catalyst activity and stability were found to be influenced by the catalyst acidity related to Bronsted acid sites and by the presence of oxygen in the feed. The NH3-TPD and FTIR-pyridine results demonstrated that partially exchanged of H+ ions by Li+ into the W/HZSM-5 catalysts could be used to control the amount of strong acid sites on the catalyst surface. Without oxygen, the 3WHLi-Z (5:1) catalyst that has strong acid sites equal to nearly 74% of the original strong acid sites in the parent HZSM-5 exhibited the highest methane conversion and selectivity towards amatics. However, the catalyst deactivated in a five hour period. In the presence of oxygen, the catalyst activity and stability could be improved further. The results of this study revealed that a suitable amount of strong Bronsted acid sites as well as oxygen addition in the feed increased the catalyst activity and stability. The 3WHLi-Z(5:1) catalyst exhibited improved performance in the dehydroaromatization of methane.

关键词: dehydroaromatization, methane, W-supported ZSM-5, partial ion exchange, H+ ion, Li ion, catalyst activity, catalyst stability, catalyst acidity, oxygen presence

Abstract: Abstract: The dehydroaramatization of methane over W-supported ZSM-5 with varying degrees of Li+ ion-exchanged catalysts was studied with and without oxygen at 1073 K and atmospheric pressure. Catalyst activity and stability were found to be influenced by the catalyst acidity related to Bronsted acid sites and by the presence of oxygen in the feed. The NH3-TPD and FTIR-pyridine results demonstrated that partially exchanged of H+ ions by Li+ into the W/HZSM-5 catalysts could be used to control the amount of strong acid sites on the catalyst surface. Without oxygen, the 3WHLi-Z (5:1) catalyst that has strong acid sites equal to nearly 74% of the original strong acid sites in the parent HZSM-5 exhibited the highest methane conversion and selectivity towards amatics. However, the catalyst deactivated in a five hour period. In the presence of oxygen, the catalyst activity and stability could be improved further. The results of this study revealed that a suitable amount of strong Bronsted acid sites as well as oxygen addition in the feed increased the catalyst activity and stability. The 3WHLi-Z(5:1) catalyst exhibited improved performance in the dehydroaromatization of methane.

Key words: dehydroaromatization, methane, W-supported ZSM-5, partial ion exchange, H+ ion, Li ion, catalyst activity, catalyst stability, catalyst acidity, oxygen presence

Nor Aishah Saidina Amin;Kusmiyati. Improved Performance of W/HZSM-5 Catalysts for Dehydroaromatization of Methane[J]. 能源化学(英文), 2004, 13 (3): 148-159.

Nor Aishah Saidina Amin;Kusmiyati. Improved Performance of W/HZSM-5 Catalysts for Dehydroaromatization of Methane[J]. Journal of Energy Chemistry, 2004, 13 (3): 148-159.

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