Table 3.

The binary or multiple CeO₂-based materials with various compositions, hollow structures, and catalytic parameters for CO catalytic oxidation.

Doped Metals	Material	Synthesis Method	SBET (m2 g−1)	Total CO Conversion Temperature	Morphology	Ref.
Co	Co3O4-CeO2−x	Sequential templating approach	55.2	166.9 °C		[70]
	Co3O4-CeO2	Self-templating method	44.8	145 °C		[71]
Cu	(Cu doping) CeO2	One-step solvothermal process	165.5	21 °C		[74]
	CeO2-CuOx	Self-assembled approach	98.7	112 °C		[75]
	CuCe-L	Aerosol-assisted synthesis	48.0~58.6	120 °C		[76]
	CuO@CeO2	Surface Etching Strategy	36.0	—		[77]
	CuO@CeO2	Template-free synthesis	90.0	60 °C		[78]
	CuO/CeO2-8%	Two-step route	24.9	130 °C		[79]
	Ce-MOF CeO2-CuO	Assistance of selective etching	86.7	98 °C		[80]
	CeO2-MOx (M = Cu, Co, Ni)	Wet-chemical approach	—	160 °C		[81]
Mn	Ce–Mn Binary Oxide	Interfacial reaction-directed synthesis	202.0	T50 = 120 °C		[55]
	MnO2/CeO2-MnO2	Sacrificial templates	103.1	206 °C		[82]
	CeO2@MnO2	Wet-chemical synthetic strategy	98.3	230 °C		[83]
	CeO2-MnOx	Hard template-assisted solution combustion	115.2	160 °C		[84]
	Mn2O3@CeO2	Wet-chemical process	54.5	220 °C		[85]
	CeO2-MnOx	Pyrolyzing Ce–Mn coordination polymers	77.8	~250 °C		[86]
Fe	Fe2O3/CeO2	PB-based wet chemical approach	73.9	~230 °C		[87]