Interfacial catalysts, coated

A pol3nner-Cu complex coated electrode was successfully applied as the interfacial catalyst for the oxidative polymerization of phenol. 

These results suggest some factors for the preparation of electrodes with electron-transfer ability, (i) There is an optimum thickness of the coated polymer film for the electron-transfer reaction, (ii) The polymer matrix should be flexible. Otherwise, the matrix retards the diffusion of a counter ion and suppresses the effective collision between redox sites. (iii) A hydrophilic but uncharged polymer domain is suitable for the mass-transfer process in catalysis. A series of polymer complex coated electrodes were prepared as interfacial catalysts (16), one example is given below. 

Depending on interfacial properties, some catalyst powder films are not stable in flowing solvent. For example, SiO2-containing materials have been reported to stick badly to the IRE in flowing solvent (5P). In such a situation, the catalyst particles may be fixed to the IRE by addition of a small amount of a polymer such as polyethylene before contacting of the slurry with the IRE 59,60. Films can also be prepared by dip- and spin coating. 

Structured supported ionic liquid-phase (SSILP) catalysis is a new concept that combines the advantages of ionic liquids (ILs) as solvents for homogeneous catalysts with the benefits of structured solid catalysts. In an attempt to prepare a homogeneous IL film on a microstructured support, SMFs were coated by a layer of carbon nanofibers as described above. An IL thin film was then immobilized on the CNF/SMF support. The high interfacial area of the IL film enabled the efficient use of a transition metal catalyst for the selective gas-phase hydrogenation of acetylenic compounds [267,268]. 

Shigehara K, Anson FC (1982) Catalysis of the reductirai of dioxygen to water at graphite electrodes coated with two transition metal catalysts acting in series. J Electroanal Chem Interfacial Electrochem 132 107-118... 

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