Cordierite/Aluminum Borate Whiskers/Co0.8FexCe0.2-xCr2O4 Catalysts: Preparation and Filtration Catalytic Performance for Carbon Soot

doi:10.15541/jim20250250

Abstract

Abstract:

With increasingly strict regulations on exhaust emissions, the higher requirements have been built for filtration of diesel particulate filter (DPF) because traditional DPF cannot meet the demand for precise filtration of nanoparticles in exhaust. In this study, a series of Co_0.8Fe_xCe_0.2-_xCr₂O₄ spinel-type catalysts were loaded on aluminum borate whiskers by hexadecyl dimethyl ammonium bromide (CTAB)-assisted co-precipitation method. The unique hierarchical microstructure design of “whisker enhanced filter-bimetallic doping catalytic oxidation” achieves a combination of efficient filtration performance and low-temperature catalytic performance, enabling catalytic oxidation of carbon soot particles at lower temperatures. Fe and Ce co-doping produces significant synergistic effects, increasing concentrations of oxygen species (oxygen vacancies), Co³⁺ and Cr⁶⁺ on the catalyst surface and enhancing reaction activity. Temperature of carbon soot particles at 50% conversion (T₅₀=446 ℃) is significantly lower than that of the blank cordierite sample (T₅₀=567 ℃). Five cyclic stability tests show that the catalysts have good stability and CO₂ selectivity (86%-94%). In conclusion, this unique hierarchical microstructure exhibits a unity of efficient particle filtration and low temperature catalytic combustion performance, with potential application in the field of DPF.

Key words: soot particle, cordierite, aluminum borate whisker, catalytic oxidation, filtration

CLC Number:

TQ174

ZHANG Mengjie, LI Zhibo, HUANG Ruinan, LÜ Xiangfei, WANG Wei. Cordierite/Aluminum Borate Whiskers/Co_0.8Fe_xCe_0.2-_xCr₂O₄ Catalysts: Preparation and Filtration Catalytic Performance for Carbon Soot[J]. Journal of Inorganic Materials, 2026, 41(4): 509-518.

Figures/Tables 23

References 34

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Sample	Calcination temperature/℃	Holding time/h
A900-3	900	3
A1000-3	1000	3
A1050-3	1050	3
A1100-3	1100	3
A1200-3	1200	3
A1050-1	1050	1
A1050-2	1050	2
A1050-4	1050	4

Sample	Calcination temperature/℃	Holding time/h
A900-3	900	3
A1000-3	1000	3
A1050-3	1050	3
A1100-3	1100	3
A1200-3	1200	3
A1050-1	1050	1
A1050-2	1050	2
A1050-4	1050	4

Sample	L_mean/μm	D_mean/μm	L_mean/D_mean
A900-3	8.69	0.66	13.17
A1000-3	37.86	1.93	19.62
A1050-3	48.42	0.71	68.20
A1100-3	42.79	1.64	26.09
A1050-1	15.70	0.62	25.32
A1050-2	36.33	1.36	26.71
A1050-4	53.49	2.07	25.84

Sample	L_mean/μm	D_mean/μm	L_mean/D_mean
A900-3	8.69	0.66	13.17
A1000-3	37.86	1.93	19.62
A1050-3	48.42	0.71	68.20
A1100-3	42.79	1.64	26.09
A1050-1	15.70	0.62	25.32
A1050-2	36.33	1.36	26.71
A1050-4	53.49	2.07	25.84

Sample	2θ/(°)	FWHM/(°)	D/nm	d/nm	a
P-CoCr₂O₄-CT	35.7881	0.8329	9.9079	0.2506	0.8312
P-C_0.8F_0.2C₀C₂-CT	35.7934	1.0052	8.2100	0.2506	0.8310
P-C_0.8F_0.15C_0.05C₂-CT	35.8655	1.2531	6.5869	0.2500	0.8294
P-C_0.8F_0.1C_0.1C₂-CT	35.8792	1.4346	5.7536	0.2500	0.8291
P-C_0.8F_0.05C_0.15C₂-CT	35.8928	1.4480	5.7009	0.2499	0.8288
P-C_0.8F₀C_0.2C₂-CT	35.9450	1.2704	6.4985	0.2496	0.8277

Cordierite/Aluminum Borate Whiskers/Co_0.8Fe_xCe_0.2-_xCr₂O₄ Catalysts: Preparation and Filtration Catalytic Performance for Carbon Soot

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Figures/Tables 23

References 34

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Sample	Relative atomic ratio
Sample	O_sur/O	Co³⁺/Co	Fe³⁺/Fe	Ce⁴⁺/Ce	Cr⁶⁺/Cr
Z/CoCr₂O₄-CT	0.78	0.53	/	/	0.41
Z/C_0.8F_0.2C₀C₂-CT	0.81	0.55	0.36	0.75	0.50
Z/C_0.8F_0.15C_0.05C₂-CT	0.82	0.56	0.36	0.77	0.50
Z/C_0.8F_0.1C_0.1C₂-CT	0.80	0.54	0.33	0.73	0.49
Z/C_0.8F_0.05C_0.15C₂-CT	0.81	0.55	0.35	0.74	0.49
Z/C_0.8F₀C_0.2C₂-CT	0.79	0.53	0.34	0.72	0.44

Sample	Amount of carbon dioxide formed/(a.u.)
Z/CoCr₂O₄-CT	85.312
Z/C_0.8F_0.2C₀C₂-CT	141.973
Z/C_0.8F_0.15C_0.05C₂-CT	145.109
Z/C_0.8F_0.1C_0.1C₂-CT	137.191
Z/C_0.8F_0.05C_0.15C₂-CT	138.278
Z/C_0.8F₀C_0.2C₂-CT	107.788

Sample	T₁₀/℃	T₅₀/℃	T₉₀/℃
Cordierite	505	567	605
Z/CoCr₂O₄-CT	426	462	506
Z/C_0.8F_0.2C₀C₂-CT	418	450	489
Z/C_0.8F_0.15C_0.05C₂-CT	418	446	478
Z/C_0.8F_0.1C_0.1C₂-CT	426	457	494
Z/C_0.8F_0.05C_0.15C₂-CT	426	456	491
Z/C_0.8F₀C_0.2C₂-CT	432	460	486

Sample	${\displaystyle {\int }_{{T}_{0}}^{T}{C}_{{\text{CO}}_{\text{2}}}\text{d}T}$/mL	${\displaystyle {\int }_{{T}_{0}}^{T}{C}_{\text{CO}}\text{d}T}$/mL	${S}_{{\text{CO}}_{\text{2}}}$
Z/CoCr₂O₄-CT	27.6	3.6	88.5%
Z/C_0.8F_0.2C₀C₂-CT	36.4	2.8	92.9%
Z/C_0.8F_0.15C_0.05C₂-CT	23.4	1.9	92.5%
Z/C_0.8F_0.1C_0.1C₂-CT	33.2	3.9	89.5%
Z/C_0.8F_0.05C_0.15C₂-CT	32.0	3.1	91.2%
Z/C_0.8F₀C_0.2C₂-CT	23.0	2.6	89.8%

Cycle	${\displaystyle {\int }_{{T}_{0}}^{T}{C}_{{\text{CO}}_{\text{2}}}\text{d}T}$/mL	${\displaystyle {\int }_{{T}_{0}}^{T}{C}_{\text{CO}}\text{d}T}$/mL	${S}_{{\text{CO}}_{\text{2}}}$
1st	23.4	1.9	92.5%
2nd	47.3	4.7	91.0%
3rd	31.9	2.2	93.5%
4th	32.0	5.0	86.5%
5th	29.4	4.3	87.2%

Sample	M₀/g	(M₀-∆M)/g	η/%
Cordierite	0.0157	0.0079	50.32
Cordierite/aluminum borate		0.0139	88.54
Z/C_0.8F_0.15C_0.05C₂-CT		0.0141	89.81

Catalyzer	Maximum combustion rate temperature/℃	Ref.
Pt/Al₂O₃	464	[S1]
Cu_xZn_1-_xAl₂O₄	630	[S2]
CoAl₂O₄	510	[S3]
CoCr₂O₄	420	[S4]
CuCo₂O₄	574	[S5]
Z/C_0.8F_0.15C_0.05C₂-CT	446	This work

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