Citation: MO Wen-long, MA Feng-yun. Performance of Au/HZSM-5 catalysts for the isomerization reaction of n-butane[J]. Journal of Fuel Chemistry and Technology, ;2015, 43(8): 980-989. shu

Performance of Au/HZSM-5 catalysts for the isomerization reaction of n-butane

1.
Key Laboratory of Coal Clean Conversion & Chemical Engineering Process(Xinjiang Uyghur Autonomous Region), College of Chemistry and Chemical Engineering, Xinjiang University, Urumqi 830046, China

Corresponding author: MA Feng-yun,
Received Date: 19 December 2014
Available Online: 9 March 2015
Fund Project: 新疆维吾尔自治区自然科学基金(2014211A014)。 (2014211A014)

The activity and selectivity to isomerization of pure n-butane and mixed butane (with different proportions of iso-butane) of Au/HZSM-5 catalysts were evaluated using a micro-scale pulse reactor. Results showed that the conversion of pure n-butane was above 7.0% and the selectivity to iso-butane could be as high as 80% on Au/HZSM-5 catalysts with 1.31% Au loading at 300℃. By contrast, the conversion of n-butane and the selectivity to iso-butane was only 0.55% and 11.67% on the HZSM-5 supporter. The conversion of n-butane increased firstly and then decreased with the increase of Au loading at a range of 0.12%~1.91%. The selectivity to iso-butane increased with increase of Au loading apparently when Au loading was at a low level. When reaction temperature was lower than 400℃, the main reaction on Au/HZSM-5 catalyst was isomerization of pure n-butane. When the temperature was higher than 400℃, the main reactions were dissociation and aromatization. 400℃ was the watershed of dissociation and aromatization under the reaction conditions of micro-scale pulse reaction. Additionally, the composition of mixed butane had certainly influence on the isomerization reaction of n-butane. But the products in the isomerization reaction of n-butane were very rare at proper reaction temperature, showing a metal-acid bifunctional catalytic character. The species of Au⁺ possibly played an important role in the dehydrogenation and hydrogenation reactions.
- Au/HZSM-5,
- catalyst,
- n-butane,
- isomerization
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