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• W2069890783 abstract "It is well-known that activity and selectivity to N2 during nitrite hydrogenation over noble metal catalysts in water depend on the pH of the solution, but mechanistic understanding is lacking. Attenuated total reflection infrared (ATR-IR) spectroscopy is an ideal tool to perform detailed studies on catalytic surfaces in water. In this paper, the influence of pH was studied on adsorption and subsequent hydrogenation of nitrite in water between pH 5 and 9 over Pd/Al2O3 and Pt/Al2O3, using ATR-IR spectroscopy. On both catalysts, pH clearly influenced the surface coverage and reaction rates of intermediates. For Pt/Al2O3, lowering the pH induced the increasing surface coverage of key reaction intermediates like NOsteps1620 cm−1 and “HNO”(ads)1540 cm−1, as well as increased hydrogenation rates, explaining the higher TOF at lower pH as reported in the literature. For Pd/Al2O3, the effect of pH on selectivity is controlled by the rate constants of the formation and hydrogenation of the most stable reaction intermediates to N2 (NO(ads)1720 cm−1) and NH4+ (NH2(ads)1510 cm−1)." @default.
• W2069890783 created "2016-06-24" @default.
• W2069890783 creator A5035955140 @default.
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• W2069890783 date "2010-12-02" @default.
• W2069890783 modified "2023-10-14" @default.
• W2069890783 title "Effect of pH on the Nitrite Hydrogenation Mechanism over Pd/Al₂O₃ and Pt/Al₂O₃: Details Obtained with ATR-IR Spectroscopy" @default.
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• W2069890783 doi "https://doi.org/10.1021/jp106521t" @default.
• W2069890783 hasPublicationYear "2010" @default.
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