Exploration of the preparation of Cu/TiO<sub>2</sub> catalysts by deposition-precipitation with urea for selective hydrogenation of unsaturated hydrocarbons

Exploration of the preparation of Cu/TiO₂ catalysts by deposition-precipitation with urea for selective hydrogenation of unsaturated hydrocarbons

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文摘

•: Cu²⁺ deposition on TiO₂ surface occurs at pH lower than the PZC of TiO₂.
•: During DPu, Cu₂(OH)₃NO₃ is submitted to Oswald ripening and decomposes to CuO.
•: Supported Cu₂(OH)₃NO₃ leads to small Cu particles, while CuO leads to large ones after reduction.
•: Cu/TiO₂ is highly selective in BD hydrogenation to butenes.
•: Small Cu particles (ex-Cu₂(OH)₃NO₃) are more catalytically active and stable than large ones (ex-CuO).