Dehydrogenation of n-Butane to Butenes and 1,3-Butadiene over PtAg/Al<sub>2</sub>O<sub>3</sub> Catalysts in the Presence of H<sub>2</sub>
- 1 Graduate School of Science & Engineering, Saitama University, Saitama, Japan
- 2 Graduate School of Science & Engineering, Saitama University, Saitama, Japan
- 3 Graduate School of Science & Engineering, Saitama University, Saitama, Japan
- 4 Graduate School of Science & Engineering, Saitama University, Saitama, Japan
- 5 Graduate School of Science & Engineering, Saitama University, Saitama, Japan
- 6 Graduate School of Science & Engineering, Saitama University, Saitama, Japan
- 7 Graduate School of Science & Engineering, Saitama University, Saitama, Japan
Abstract
The Al 2 O 3 -supported PtAg catalysts were prepared and evaluated for the dehydrogenation of n -butane at 550 ° C in the presence of H 2 . The PtAg/ Al 2 O 3 catalyst prepared by an impregnation method using the Cl - removing Pt/Al 2 O 3 and AgNO 3 showed a higher activity and selectivity to butenes and 1,3-butadiene compared to the Pt/ Al 2 O 3 catalyst, but a large amount of coke (about 30 wt% versus the catalyst weight) was formed during the dehydrogenation. The free Ag metal on the prepared catalyst dramatically promoted the coke formation, because the dehydrogenation of 1-butene over the Ag/ Al 2 O 3 catalyst produced a large amount of coke. The Cl - addition to the Cl- free Pt/ Al 2 O 3 catalyst decreased the coke formation by the reaction of the free Ag particles and Cl to form AgCl which was inactive for the coke formation. The highest initial conversion (50.3%) was obtained with the selectivity to butenes and 1,3-butadiene (butenes = 80.2% and 1,3-butadiene = 5.9%) when the PtAg/ Al 2 O 3 catalyst modified with Cl- was used.
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