Activity and Stability of Pd Bimetallic Catalysts for Catalytic Nitrate Reduction

In this work, we study the effect of modifying metal loading (0.5–1.5 wt.% Pd and 0.1–1 Sn or In), impregnation order noble promoter (Pd–Sn Sn–Pd), type (Sn In) during preparation process for a bimetallic catalyst, supported on γ-alumina, used in catalytic reduction nitrate. The deposition over metal, especially with Pd:Sn ratios (wt.) 1:10 1:2, favored hydrogen spillover rate increased H concentration catalyst surface, enhancing NH4+ production. On other hand, Pd–In catalysts showed higher activity than catalysts, as well selectivity. stability Pd–Sn/Al2O3 (1.5–1 wt.%) was evaluated long-term experiments treatment synthetic water (100 mg L−1 NO3−) three different commercial drinking waters. This achieved stable nitrate conversion duration 50 h treatment. However, significant loss presence ions (different to reaction medium, increasing slightly selectivity NH4+.