The direct regioselective hydrogenation of a,b-unsaturated aldehydes in aqueous multiphase catalysis was investigated in a capillary microreactor with channel diameters ranging from 500 to 1000 lm. By connecting two mixers in line, a regular and stable alternating plug flow behavior could be generated, allowing accurate measurement of the plug geometry and hence the calculation of the specific surface area relevant for mass transport. These parameters are essential for reliable kinetic modeling of multiphase reaction systems containing microkinetic as well as transport terms.
The sections in this article are
Generalities in Regioselectivity with Heterogeneous Catalysts
Definitions
General Factors Determining Selectivity
Reaction Engineering and Selectivity
Selective Hydrogenation of α, β‐Unsaturated Aldehydes
Physicochemical Basics and Reaction Mechanism
Metal Specificity and Structure Sensitivity
Influence of Support Materials, Zeolites and Surface Modifiers
Influence of a Second Metal on Selectivity
Regioselective Hydrogenation in the Presence of Green Solvents
Kinetic Modeling
Selective Hydrogenation of Polyenes
Selective Hydrogenation of Ketones
Selective Hydrogenation of Polycyclic Aromatics and Derivatives
Selective Hydrogenation of Nitroaromatics
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