Selective Catalytic Hydrogenation of Nitrate to Nitrogen on Pd-Cu/TiO2 Catalysts
Date Issued
2009
Date
2009
Author(s)
Chen, Szu-Ying
Abstract
The catalytic hydrogenation technology applied in the removal of nitrate in water has been proved to be an effective and economical treatment process. Therefore, in this study, the main purpose is to enhance the nitrogen selectivity of nitrate degradation using catalytic hydrogenation method with different prepared catalysts. Three different catalyst preparation method, photodeposition method, thermal impregnation method, and electroless plating method, were employed to the nitrate degradation. The catalyst prepared by photodeposition exhibits the most uniform metal distribution and the highest selectivity of nitrogen. Therefore, titanium (P25) supported palladium-copper bimetallic catalysts (Pd-Cu/TiO2) prepared by photodeposition are applied to the catalytic hydrogenation of nitrate (NO3－) in the liquid phase. The morphologies and the characterization of the prepared catalysts were examined with transmission electron microscopy (TEM), surface area analysis (BET), temperature programming reduction (TPR), and Fourier transform infrared spectrophotometer (FTIR). The optimum operating values of Pd:Cu ratio, total metal content, calcined temperature, hydrogen flow rate, and pH value for maximizing the nitrogen selectivity of catalytic hydrogenation have been determined to be 1:1, 3 wt.%, 200 ℃, 100 ml/min, and 7.
Subjects
catalytic hydrogenation
nitrate
titania
photodeposition
bimetallic catalyst
Type
thesis
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