Low Temperature Catalytic Performance of Nanosized CeNbNiO Mixed Oxide for Oxidative Dehydrogenation of Propane to Prope
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Low Temperature Catalytic Performance of Nanosized CeNbNiO Mixed Oxide for Oxidative Dehydrogenation of Propane to Propene Jianhui Li • Caicai Wang • Chuanjing Huang Weizheng Weng • Huilin Wan
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Received: 9 September 2009 / Accepted: 17 March 2010 / Published online: 2 April 2010 Ó Springer Science+Business Media, LLC 2010
Abstract Nanosized CeNbNiO catalysts have been prepared by a modified sol–gel method and investigated in the oxidative dehydrogenation of propane to propene (ODHP). The addition of Nb into NiO can enhance the propene selectivity, while Ce introduction can largely increase propane conversion at low temperature. With 1.5Ce3NbNiO catalyst, a propene yield of 10.4% was obtained at 250 °C. XRD, N2-adsorption, H2-TPR, XPS, O2-TPD, NH3-TPD and pulse reaction have been performed to study the intrinsic difference between these NiO-based catalysts. A strong interaction between Ni and Ce/Nb species was clearly evidenced for the doped NiO samples. The doped elements affected greatly the catalyst properties such as surface acidity and the reactivity of oxygen species, which are closely related to the catalytic performance of the catalysts. Keywords Oxidehydrogenation of propane Low temperature CeNbNiO
J. Li C. Wang C. Huang (&) W. Weng H. Wan (&) State Key Laboratory for Physical Chemistry of Solid Surfaces, National Engineering Laboratory for Green Chemical Productions of Alcohols, Ethers and Esters, Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, People’s Republic of China e-mail: [email protected] H. Wan e-mail: [email protected]
1 Introduction Propene is an important raw material in the modern chemical industry and mostly produced by steam cracking and FCC currently [1]. Now lots of attentions are paid in the oxidative dehydrogenation of propane (ODHP) to produce propene [2], which can overcome the drawbacks of thermal dehydrogenation such as thermodynamics limited, rapid coking and high reaction temperature. One of the challenges for the process is how to achieve a high selectivity in the presence of oxygen with high conversion of propane, because propene is more reactive than propane and prone to side reaction. Therefore, a suitable catalyst is required to overcome this limitation by supplying a controlled amount of highly reactive oxygen that can active propane at lower temperature at which dehydrogenation products do not react so quickly [3]. Extensive studies have been made on supported vanadium oxide-based catalysts for the ODHP reaction. However, most of them are active at rather high-temperature (T [ 500 °C) [4–7]. Among other oxide systems, those containing nickel are also reported as active and selective for the reaction, especially at lower temperature [8–15]. It have been reported that Ni–Ce–O precipitated catalyst exhibited low-temperature performance with 19.2% propane conversion at 300 °C [11]. Recently, Heracleous and Lemonidou [9, 10] developed a new class of materials of Ni–Nb–O catalysts which exhibit high activity
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