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- W2016164465 abstract "Abstract The aqueous co-impregnation of rhodium trichloride with hydrofluoric acid (HF) into γ-alumina honeycombs is shown to be a reliable and predictable method for preparing catalysts with controlled distributions of metal. Electron probe microanalysis of these catalysts revealed that adding HF to the impregnating solution drove the Rh species beneath the external surface of the support into narrow egg-white bands. The objective of this work is to prepare a poison resistant catalyst which can be used for the reduction of nitric acid in flue gases. A multicomponent adsorption/exclusion model of the impregnation and drying steps of this catalyst preparation method is presented, and theoretical internal distributions are compared to experimentally measured Rh and F profiles. A good fit to the experimental Rh profiles was obtained using two adjustable parameters: the adsorption rate constant of the aqueous Rh species and the diffusivity of HF. All other parameters were experimentally determined, or reported in the literature. Simulated impregnation profiles were found to lend insight into the co-impregnation process. By comparing simulated catalyst profiles before and after drying, it was found that drying had a significant impact on determining the internal distribution of the deposited Rh. Although sharp Rh bands were formed during the impregnation step of preparation, the ultimate shape, height, and position of these buried layers of Rh were determined by the drying step." @default.
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- W2016164465 date "1991-03-01" @default.
- W2016164465 modified "2023-09-24" @default.
- W2016164465 title "Co-impregnated Rh/Al203 I. Preparation" @default.
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- W2016164465 doi "https://doi.org/10.1016/0021-9517(91)90064-b" @default.
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