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Kinetic studies of cyclohexane hydrogenation catalyzed by the Rh(I) compounds with 2-aminopyridine
Affiliation:1. College of Engineering, Peking University, Beijing 100871, China;2. School of Energy and Power Engineering, Beihang University, Beijing 100191, PR China;3. Department of Mechanical Engineering, The Hong Kong Polytechnic University, Kowloon, Hong Kong;1. School of Pharmacy and Pharmaceutical Sciences, Faculty of Health Sciences and Wellbeing, University of Sunderland, Dale Building, Pasteur 153, Sciences Complex, Wharncliffe Street, Sunderland SR1 3SD, United Kingdom;2. CBC Health Ltd, Building 7, Queens Park, Queensway North, Team Valley, Gateshead, Tyne and Wear NE11 0QD, United Kingdom;3. School of Pharmacy and Pharmaceutical Sciences, Faculty of Health Sciences and Wellbeing, University of Sunderland, Dale Building, Sciences Complex, Wharncliffe Street, Sunderland SR1 3SD, United Kingdom;1. Combustion Chemistry Centre, School of Biological and Chemical Sciences, Ryan Institute, MaREI, University of Galway, Galway, H91 TK 33, Ireland;2. Department of Energy Science and Engineering, Indian Institute of Technology Delhi, India;3. School of Energy and Power Engineering, Huazhong University of Science & Technology, Wuhan, Hubei, China;4. Chemical Sciences and Engineering Division, Argonne National Laboratory, Lemont, IL 60439, USA
Abstract:The kinetics of homogeneous hydrogenation of cyclohexene in the presence of the catalytic Rh2Cl2(C8H14)4 + 2-aminopyridine has been investigated (C8H14 = cyclooctene). The rate of reaction may be expressed as
></figure> At 30 °C the equilibrium constants are: <em>K</em><sub>1</sub> = 862 mol<sup>−1</sup> l, <em>K</em><sub>2</sub> = 4.9 mol<sup>−1</sup> l and rate constant <em>k</em> = 14.0 mol<sup>−1</sup> l s<sup>−1</sup>. The activation parameters are: <em>E</em><sub>a</sub> = 26.9 kJ mol<sup>−1</sup>, Δ<em>H</em><sup>≠</sup> = 24.4 kJ mol<sup>−1</sup>, Δ<em>S</em><sup>≠</sup> = − 135.9 J K<sup>−1</sup> mol<sup>−1</sup>. The catalyst is about 10 times more active in the hydrogenation of cyclohexene than RhCl (PPh<sub>3</sub>)<sub>3</sub>.</td>
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