Catalysts Pd/γ-Al2O3 on the foam monoliths for the VOC containing exhaust neutralization

The influence of the inlet temperature, volatile organic compounds (VOC) concentration and gas hourly space velocity upon the VOC (ethanol/ ethyl acetate) catalytic oxidation over Pd/γ-Al2O3 catalyst on foam supports was studied. One of the objectives was to determine the activity and stability of Pd/γ-Al2O3-catalysts on ceramic and metal block supports with cellular structure in the catalytic neutralization of VOC vapors (ethanol, ethyl acetate) in laboratory conditions and selection the most stable catalyst for producing the enlarged party, the second is setting of a pilot plant and testing an enlarged party of cellular block catalyst for vapors VOCs neutralization in the production of flexographic. The high (>99 %) conversion was found to be at volume velocity less than ~104 h–1 for VOC concentration of 0,5 g/m3 and volume velocity up to ~5·105 h–1 for VOC concentration of 5,0 g/m3 and. The stability of the ceramic and metallic foam supported catalysts was studied. Dramatic deactivation of the catalyst on the metallic support after long term tests in the reaction media resulting from the formation of the nickel acetate and nickel oxide was found. Tests of a pilot setup with the foam supported catalyst in the flexography industry vent exhaust neutralization demonstrated the catalyst effectiveness.

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