CO is a ubiquitous air pollutant, frequently encountered in the fields of automotive exhaust purification, especial in the cold-start-emission stage. Pt based catalysts are widely used to purify CO into CO 2 owing to their exceptional performance. But they can be few excited to exhibit reasonable catalytic activity due to the low temperature at the cold-start-emission stage. In exhaust gas purification catalysts used by fossil fuel-based vehicles, Al 2 O 3 is used frequently. But there are rarely reports of Pt loaded Al 2 O 3 catalysts achieving feasible activity of CO oxidation at room temperature. Herein, we prepared Cu x Pt y alloy/Al 2 O 3 catalysts (with high penta-coordinated Al 3+ (Al V )), Al V centers as binding sites for Cu 3 Pt 1 alloys on Al 2 O 3 enable the high dispersion and stability of Cu 3 Pt 1 alloy. The adsorption capacity of O 2 and CO molecules on Cu 3 Pt 1 surface are stronger than the case on Pt surface, which may make O 2 and CO molecules more easily activated, making the CO oxidation reaction easier. In addition, the desorption of CO 2 from Cu x Pt y surface is easier compared to that on Pt surface, increasing the frequency of use of active sites there. Therefore, this Cu 3 Pt 1 /Al 2 O 3 catalyst exhibits 100 % conversion of CO with a GHSV of 6×10 3 mL·g −1 cat ·h −1 at room temperature. This work provides a feasible guideline for the design and synthesis of Pt loaded Al 2 O 3 catalysts toward room temperature CO oxidation.
Herein, a series of nano-flower sheet-like alumina spheres (NF-Al 2 O 3 ) with rich unsaturated pentacoordinate Al 3+ sites stabilizing Ru-CeO x catalysts were designed and synthesized for catalytic total oxidation of one typical light alkanes (propane, C 3 H 8 ). The 90 % conversion temperature (T 90 ) and the apparent activation energy (Ea) of Ru-Ce 7 /NF-Al 2 O 3 modified by 7 wt.% of CeO 2 were as low as 207 °C and 56.7 kJ mol −1 , respectively. In addition, it also exhibited superior water, sulfur and carbon dioxide resistance and recycling performance. The excellent catalytic performance of propane total oxidation over Ru-CeO x /NF-Al 2 O 3 is mainly attributed to NF-Al 2 O 3 has rich unsaturated pentacoordinate Al 3+ sites can anchor the Ru-CeO x active species. The anchoring effect of Al 3+ penta on the metal active unit can effectively promote the dispersion of Ru-CeO x active species and stabilize the electronic valence state of Ru 0 . The degradation of C 3 H 8 over Ru-CeO x /NF-Al 2 O 3 conformed to the Mars-van-Krevelen mechanism through two different pathways as revealed by the in situ DRIFTS.
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