Conversion of propane using H-ZSM-5 and Ga/H-ZWM-5 in the presence of Co-fed nitric oxide, oxygen, and hydrogen
- Univ. of Liverpool (United Kingdom)
The conversion of propane to propene and aromatic hydrocarbons has been studied using cofed NO, O{sub 2}, and H{sub 2} to probe the reaction mechanism with H-ZSM-5 and Ga{sub 2}O{sub 3}/H-ZSM-5 physical mixtures as catalysts. NO co-feeding with H-ZSM-5 causes a decrease in the conversion of propane and in the yields of methane and aromatic products. Although propane conversion decreases, NO does not affect the yield of propane. Similar effects are observed when NO is co-fed using Ga{sub 2}O{sub 3}/H-ZSM-5 as catalysts. O{sub 2} co-feeding with H-ZSM-5 leads to an increase in propane conversion, propene yield, and deactivation rate, whereas, as observed with NO, the yields of methane and aromatic products are decreased. Co-feeding of excess H{sub 2}, which is a major product from the aromatization of propane, has very little effect on the conversion of propane over H-ZSM-5, although the selectivities to alkanes are increased. For Ga{sub 2}O{sub 3}/H-ZSM-5 physical mixtures containing 10-90% Ga{sub 2}O{sub 3}. H{sub 2} co-feeding leads to a significant decrease in propane conversion and in yield of aromatic products. For Ga{sub 2}O{sub 3} alone, the co-feeding of H{sub 2} gives a significant increase in propane conversion with only limited effects on the product selectivities. A series of experiments that use a physical mixture of Ga{sub 2}O{sub 3} powder and pelleted H-ZSM-5 with an without co-fed H{sub 2} in which the mixture is separated by sieving after reaction for 3 h at 600{degrees}C is described. The results are interpreted in terms of a mechanism in which propane is activated at the interface between the gallium oxide and the zeolite. 47 refs., 9 figs., 5 tabs.
- OSTI ID:
- 75792
- Journal Information:
- Journal of Catalysis, Vol. 151, Issue 1; Other Information: PBD: Jan 1995
- Country of Publication:
- United States
- Language:
- English
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