2017年7月27日 · Single-atom metal catalysts offer a promising way to utilize precious noble metal elements more effectively, provided that they are catalytically active and sufficiently stable. Herein, we report a...

2023年8月8日 · Here, controlled catalyst synthesis, temperature-programmed reduction (TPR), in situ infrared spectroscopy (IR), and in situ electron energy loss spectroscopy (EELS) were used to interrogate the mechanisms of how Pt nanoclusters and single atoms influence H 2 reactions on high-surface area Pt/CeO 2 powder catalysts. TPR showed that Pt promotes ...

本研究展示了如何通过蒸汽处理（750°C）活化氧化铈（CeO2）上原子分散的离子铂（Pt2+ ），使其在具有出色的水热稳定性的同时，实现实现一氧化碳（CO）低温氧化活性的目标。 在 Pt2+ 附近的 CeO2上形成了一种新型活性位点，从而提高了反应活性。 这些活性位点在氧化环境中高达 800°C 时仍然保持稳定。 目前正在开发新型内燃机，以满足更高的燃油效率和更低的温室气体排放标准，但其商业潜力取决于是否满足控制标准污染物（一氧化碳、氮氧化物、碳氢化 …

2015年6月1日 · The TPR results support the faster stabilization of PtPd-CoImp since the reduction of H 2 consumption was the main effect of NO oxidation while PtPd-Seq developed a second high temperature reduction peak, which was identified as a possible cause of the slow stabilization of Pt/Al 2 O 3.

2020年2月26日 · This Pt SAC exhibits remarkable activity for oxidation of CO and hydrocarbons with 90% conversion at temperatures as low as ~160 oC under simulated diesel exhaust conditions while using 5 times...

2016年7月30日 · Pt/Ce 0.27 Zr 0.73 O 2 and Pt/Ce 0.27 Zr 0.70 La 0.03 O x catalysts, prepared by co-precipitation and impregnation methods, were thermally treated at different temperatures for 10 h and then characterized by X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET), X-ray photoelectron spectroscopy (XPS), H 2 temperature-programmed reduction (H 2 ...

H2-TPR profiles for Pt-supported catalysts. Strontium was introduced into CeO2–ZrO2 mixed oxides (CZ) by doping and impregnation methods, and then Pt was impregnated on the Sr-modified CZ to...

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2015年10月5日 · The H 2-TPR profiles recorded for γ-Al 2 O 3 impregnated with noble metals revealed intensive reduction peaks. The Pt-impregnated sample, Al 2 O 3-600–Pt showed a broad reduction profile centered around 190 °C, which can be ascribed to the reduction of amorphous PtO x species, while the broadening can suggest some interactions with the ...

2019年8月28日 · 近日，通用汽车研发中心、天津大学和密歇根大学催化研究人员合作在《自然-通讯》发表了题为 “Surpassing the single-atom catalytic activity limit through paired Pt-O-Pt ensemble built from isolated Pt1 atoms” 的研究进展。