title: Direct Dehydrogenation of n-Butane Over Pt/Sn/Zn-K/Al2O3 Catalyst: Effect of Hydrogen in the Feed.
abstract: Al2O3 was prepared by a sol-gel method for use as a support. Pt/Sn/Zn-K/Al2O3 catalyst was then prepared by a sequential impregnation method, and it was applied to the direct dehydrogenation of n-butane to n-butenes and 1,3-butadiene. Physicochemical properties of Pt/Sn/Zn-K/Al2O3 catalyst were examined by X-ray diffraction (XRD), nitrogen adsorption-desorption isotherm, inductively coupled plasma atomic emission spectroscopy (ICP-AES), temperature-programmed reduction (TPR), CO chemisorption, and temperature-programmed oxidation (TPO) measurements. In order to improve the catalyst stability, the effect of hydrogen in the feed on the catalytic performance in the direct dehydrogenation of n-butane was studied. The catalyst stability and reusability in the direct dehydrogenation of n-butane was also investigated. Experimental results revealed that the addition of hydrogen in the feed decreased conversion of n-butane and yield for total dehydrogenation products but improved the stability of the catalyst. The catalytic activity and stability of regenerated Pt/Sn/Zn-K/Al2O3 catalyst in the presence of hydrogen slightly decreased compared to those of fresh Pt/Sn/Zn-K/Al2O3 catalyst due to the slight sintering of platinum particles.
authors.forename: Jong Kwon
authors.initials: JK
authors.lastname: Lee
authors.forename: Hyun
authors.initials: H
authors.lastname: Seo
authors.forename: Jeong Kwon
authors.initials: JK
authors.lastname: Kim
authors.forename: Hanuk
authors.initials: H
authors.lastname: Seo
authors.forename: Hye-Ran
authors.initials: HR
authors.lastname: Cho
authors.forename: Jinsuk
authors.initials: J
authors.lastname: Lee
authors.forename: Hosik
authors.initials: H
authors.lastname: Chang
authors.forename: In Kyu
authors.initials: IK
authors.lastname: Song