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Catalysis of Organic..

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372 MIBK Synthesis via CDIn MIBK, the asymmetric and symmetric bands <strong>of</strong> ν(CH 3 ) at 2960 and 2875 cm -1become much stronger than those <strong>of</strong> the ν(CH 2 ) due to the saturation <strong>of</strong> the C=Cbond.Figure 4 (right)DRIFT adsorptionspectra <strong>of</strong> mesityloxide pulse adsorbedat 25°C on Pd/Al 2 O 3catalyst pre-reducedin H 2 for 1h at 120°Crecorded in a timeinterval <strong>of</strong> 10 sec(bottom) in situhydrogenation <strong>of</strong>mesityl oxide at 25°Cas purged by H 2recorded in a timeinterval <strong>of</strong> 10 sec.flectance (%)re2982MO pulse ads.Δt = 10 sec2960H 2purge29202875time increasestime increases16771700161014501610 14501677136413703200 3000 2800 1800 1600 1400 1200wavenumber (cm -1 )reflectance (a.u.)29652875MIBK pulse ads.Δt = 10 sec14701369timeIncrease170025 o C50 o C100 o C150 o C200 o C2875 1470 137017002960Figure 5Left: DRIFTspectra <strong>of</strong> MIBKpulse adsorbedon Pd/Al 2 O 3recorded in 10sec intervalsRight: DRIFTdesorptionspectra <strong>of</strong> MIBKas temperature isincreased to200°C.3200 2800 1800 1600 1400 3200 2800 1800 1600 1400 1200wavenumber (cm -1 )The DRIFT spectra <strong>of</strong> MIBK are illustrated on the left side <strong>of</strong> Figure 5, asMIBK is pulse adsorbed onto the Pd/Al 2 O 3 catalyst. The MIBK desorption DRIFT

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