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with the OH groups on the surface of the amphoteric γ-Al 2 O 3 support yet during the impregnation and drying steps [ 16 , 23 ], should also affect the WGS reaction by changing the acid–base properties of the system. Certainly, the latter

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RCE , F. , 2005 . Characterization and acid–base properties of fulvic and humic acids isolated from two horizons of an ombrotrophic peat bog . Geoderma . 126 . 367 – 374 . G

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correlated to new active sites created in the metal-support interfacial region for metal supported catalysts [ 7 ] and to both reducibility and surface acid–base properties for bulk metal oxide catalysts [ 9 ]. The role of the metal and acid–base properties

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