Effect of Different Alkali-assisted Deposition Precipitation Methods on the Durability of Three-way Catalysts

doi:10.15541/jim20200357

Abstract

Abstract:

The aging treatment always brings about severe deactivation of three-way catalysts (TWCs) so that improving the durability is one goal of TWCs design. In this work, Pt/Ce_0.4Zr_0.5La_0.05Pr_0.05O₂ (Pt/CZ) TWCs were prepared by two different alkali-assisted deposition precipitation method, urea or ammonia. The effects of different alkali-assisted on the physicochemical properties, catalytic activity and durability were analyzed. It was found that the Pt/CZ catalyst prepared by urea-assisted deposition precipitation method (UDP) had poor aging resistance but the Pt/CZ catalyst prepared by ammonia-assisted (ADP) showed better anti-aging ability. Based on the results of XRD, CO adsorption, XPS and H₂-TPR, comparatively larger particle size of Pt species and stronger interaction for ADP make it more difficult to sinter together during the aging treatment, which is favorable for maintaining catalytic activity. Therefore, the ADP catalyst shows a bright future for industrialization.

Key words: three-way catalysts, deposition precipitation, alkali-assisted, durability

CLC Number:

O643

FAN Jun, JIANG Xue, JIAO Yi, CHEN Yusheng, WANG Jianli, CHEN Yaoqiang. Effect of Different Alkali-assisted Deposition Precipitation Methods on the Durability of Three-way Catalysts[J]. Journal of Inorganic Materials, 2021, 36(6): 659-664.

Figures/Tables 8

References 25

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Samples	Surface area/ (m²•g^-1)	Pore volume/ (mL•g^-1)	Average pore radius/nm
IM	60	0.23	7.5
UDP	63	0.22	7.5
ADP	61	0.23	7.7
IM-a	49	0.24	9.4
UDP-a	50	0.22	7.6
ADP-a	53	0.25	7.7
CZLP	64	0.25	8.7

Samples	Surface area/ (m²•g^-1)	Pore volume/ (mL•g^-1)	Average pore radius/nm
IM	60	0.23	7.5
UDP	63	0.22	7.5
ADP	61	0.23	7.7
IM-a	49	0.24	9.4
UDP-a	50	0.22	7.6
ADP-a	53	0.25	7.7
CZLP	64	0.25	8.7

Sample	Pt⁰/Pt ratio	Pt²⁺/Pt ratio	Pt⁴⁺/Pt ratio	O_ads/O ratio	Ce³⁺/Ce ratio
IM	0	0.871	0.129	0.354	0.217
UDP	0	0.851	0.149	0.374	0.240
ADP	0	0.831	0.169	0.324	0.201
IM-a	0.302	0.698	0	0.329	0.195
UDP-a	0.421	0.579	0	0.350	0.187
ADP-a	0.234	0.766	0	0.336	0.214

Sample	Pt⁰/Pt ratio	Pt²⁺/Pt ratio	Pt⁴⁺/Pt ratio	O_ads/O ratio	Ce³⁺/Ce ratio
IM	0	0.871	0.129	0.354	0.217
UDP	0	0.851	0.149	0.374	0.240
ADP	0	0.831	0.169	0.324	0.201
IM-a	0.302	0.698	0	0.329	0.195
UDP-a	0.421	0.579	0	0.350	0.187
ADP-a	0.234	0.766	0	0.336	0.214

Sample	CO		NO		C₃H₈		C₃H₆
Sample	T₅₀/℃	ΔT /℃	T₅₀/℃	ΔT/℃	T₅₀/℃	ΔT/℃	T₅₀/℃	ΔT/℃
IM	174	-	260	-	269	-	234	-
UDP	142	-	259	-	273	-	228	-
ADP	187	-	277	-	284	-	254	-
IM-a	215	41	304	44	312	43	278	44
UDP-a	229	87	313	54	328	55	287	59
ADP-a	203	16	294	17	306	22	272	18