Fig. 1: Steam-treated Pd1/CeO2-AT SAC prepared by atom-trapping generates a highly active catalyst in formaldehyde oxidation attributed to the formation of Ce3+ species.
From: Generating active metal/oxide reverse interfaces through coordinated migration of single atoms
a HCHO conversion as a function of temperature on catalysts (Pd/CeO2-AT-S, Pd1/CeO2-AT, Pd/CeO2-I-S, and Pd1/CeO2-I). The error bar indicates the standard deviation of the data measured in three tests. Reaction conditions: 400 ppm HCHO, 20 vol% O2, and N2 as balance gas, total flow rate: 50 mL·min−1, WHSV (weight hourly space velocity): 60,000 mL·g−1·h−1. b HCHO conversion as a function of time on stream on Pd/CeO2-AT-S and Pd/CeO2-I-S catalysts at 30°C. Reaction conditions: 400 ppm HCHO, 20 vol% O2, and N2 as balance gas, total flow rate: 50 mL·min−1 and WHSV: 100,000 mL·g−1·h−1. c Arrhenius plots of reaction rate (μmol HCHOconverted·gPd−1·s−1) over the Pd catalysts supported on CeO2 before and after steam treatment. Reaction conditions: 520 ppm HCHO, 20 vol% O2, and balance N2, total flow rate: 100 mL·min−1. The conversion was kept at <20% by adjusting the catalyst amount. The error bar indicates the standard deviation of the data measured in three tests. d XPS spectra of Pd 3d for the Pd1/CeO2-AT and Pd/CeO2-AT-S catalysts. e 5 keV 20Ne+ HS-LEIS spectra of the CeO2, Pd1/CeO2-AT, and Pd/CeO2-AT-S catalysts showing the species on the topmost layer of the samples. f CO-DRIFTS spectra of the Pd1/CeO2-AT and Pd/CeO2-AT-S catalysts after exposure to a flow of CO/O2/N2 for 30 min, followed by degassing in O2/N2 at 30 °C for 15 min (arb. units, arbitrary units).
