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- Title
Enhancing the Catalytic Oxidation of Carbon Monoxide Using K-OMS-2 by Surface Modification with Binary Oxides of Copper and Other Metals.
- Authors
Cam, Thanh Son; Uyen, Truong Thi Thao; Tuyen, Nguyen Thu; Le, Bui Khanh; My, Nguyen Nhat; Ngan, To Nguyen Huynh; Thuy, Vo Thi Thanh; Hien, Lam Pham Thanh; Thuy, Nguyen Thi; Lei, Juying; Thanh, Nguyen Trung; Huy, Nguyen Nhat
- Abstract
With the goal of finding low-cost materials that can completely substitute the precious- and noble-containing catalysts and be active toward the oxidation of CO at low temperatures (around 100 °C), transition metal oxide-doped cryptomelane (e.g., K-OMS-2, MeOx/K-OMS-2, and CuOx-MeOx/K-OMS-2; Me = Ni, Fe, Cd, Sn, Mn, Cr, Co, Zn, and Al) were obtained by the impregnation method with different synthesis conditions. The synthesized samples were then tested for CO conversion and characterized by means of powder X-ray diffraction, elemental mapping and composition, as well as scanning electron microscopy. It was demonstrated that the K-OMS-2 support doped by a composite of CuOx-NiOx (promoter) and calcined at 400 °C gave higher catalytic activity than the other samples, with a 90% CO conversion at around 120 °C. Other factors that could be controlled for increasing CuOx-NiOx/K-OMS-2_400 activity were to set the mass percentage of dopants and the atomic ratio of Cu:Ni to about 15 mass% and 1:1, respectively. Under different catalytic reaction conditions such as various inlet CO concentrations (CCO, 750–4000 ppm), amounts of catalyst (mcat, 0.25–1.25 g), and gas-air flow rates (Fgas, 0.5–1.25 L/min), the catalyst activity was found to be enhanced when the CCO and Fgas were reduced and the mcat raised. Moreover, the CuOx-NiOx/K-OMS-2_400 catalyst exhibited high stability and durability. The calculated average size of K-OMS-2 crystallites was approximately 12 nm, while the composite phase was in its amorphous state. This sample showed a morphology of nanofiber-like shapes with different lengths.
- Subjects
TRANSITION metals; CATALYTIC oxidation; OXIDATION of carbon monoxide; X-ray powder diffraction; METALS; CATALYTIC activity; SCANNING electron microscopy
- Publication
Catalysis Letters, 2024, Vol 154, Issue 7, p3184
- ISSN
1011-372X
- Publication type
Article
- DOI
10.1007/s10562-023-04552-3