Influence of Alcohol on Performance of Ce0.65Zr0.35O2 and Its Corresponding Pd-only Catalyst in Ageing System

doi:10.15541/jim20140223

Abstract

Abstract:

CZ oxygen storage material was prepared by co-precipitation method. The ethanol-water, propyl alcohol-water, ethylene glycol-water, and glycerol-water ageing systems were used to age the precipitate. CZ was characterized by scanning electron microscope (SEM) and nitrogen sorption techniques. Their corresponding Pd/CZ were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscope (XPS), oxygen storage capacity (OSC), and hydrogen temperature-programmed reduction (H₂-TPR) techniques. The results showed that the CZ prepared in ethanol-water and propyl alcohol-water ageing system exhibited large BET surface and pore size, high pore volume, as well as excellent thermal stability. The propyl alcohol-water imparted CZ the highest thermal stability, with BET surface of 28 m²/g and pore volume 0.1 mL/g after ageing. The corresponding aged Pd/CZ showed prominent catalytic performance. The T₅₀and T₉₀ of C₃H₈, CO and NO were lower than those over the catalysts prepared in ethylene glycol-water and glycerol-water ageing system obviously.

Key words: alcohol-water system, CZ oxygen storage material, Pd-only catalyst, performance

CLC Number:

O643

HUANG Li -Hua, CHEN Shan-Hu, GONG Mao-Chu, CHEN Yao-Qiang. Influence of Alcohol on Performance of Ce_0.65Zr_0.35O₂and Its Corresponding Pd-only Catalyst in Ageing System[J]. Journal of Inorganic Materials, 2015, 30(2): 195-201.

Figures/Tables 8

References 31

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Catalyst	Fresh				Aged				Ce/Zr ratio		(u₃/Ce3d) /%
Catalyst	Ce3d	Zr3d	O1s	Pd3d	Ce3d	Zr3d	O1s	Pd3d	Fresh	Aged	Fresh	Aged
Pd/CZ-Y	16.29	8.99	73.24	1.49	11.86	9.11	78.10	0.93	1.81	1.30	16.52	17.02
Pd/CZ-B	14.13	8.06	76.02	1.25	11.81	9.18	78.06	0.95	1.75	1.29	16.38	16.43
Pd/CZ-YE	10.56	9.51	77.49	1.44	9.82	10.37	79.36	0.45	1.21	0.95	17.89	18.88
Pd/CZ-BS	9.63	8.39	80.28	1.70	8.95	10.58	79.79	0.68	1.15	0.85	18.22	18.64

Catalyst	Fresh				Aged				Ce/Zr ratio		(u₃/Ce3d) /%
Catalyst	Ce3d	Zr3d	O1s	Pd3d	Ce3d	Zr3d	O1s	Pd3d	Fresh	Aged	Fresh	Aged
Pd/CZ-Y	16.29	8.99	73.24	1.49	11.86	9.11	78.10	0.93	1.81	1.30	16.52	17.02
Pd/CZ-B	14.13	8.06	76.02	1.25	11.81	9.18	78.06	0.95	1.75	1.29	16.38	16.43
Pd/CZ-YE	10.56	9.51	77.49	1.44	9.82	10.37	79.36	0.45	1.21	0.95	17.89	18.88
Pd/CZ-BS	9.63	8.39	80.28	1.70	8.95	10.58	79.79	0.68	1.15	0.85	18.22	18.64

Catalyst		T₅₀/℃	T₉₀/℃
Catalyst		C₃H₈NO CO	C₃H₈NO CO
Fresh	Pd/CZ-Y	238 135 102	275 155 170
	Pd/CZ-B	243 132 110	280 150 180
	Pd/CZ-YE	270 175 150	310 195 210
	Pd/CZ-BS	290 185 160	330 205 235
Aged	Pd/CZ-Y	326 208 175	383 235 230
	Pd/CZ-B	318 192 165	370 210 215
	Pd/CZ-YE	395 275 260	- 320 300
	Pd/CZ-BS	380 265 250	420 305 295

Catalyst		T₅₀/℃	T₉₀/℃
Catalyst		C₃H₈NO CO	C₃H₈NO CO
Fresh	Pd/CZ-Y	238 135 102	275 155 170
	Pd/CZ-B	243 132 110	280 150 180
	Pd/CZ-YE	270 175 150	310 195 210
	Pd/CZ-BS	290 185 160	330 205 235
Aged	Pd/CZ-Y	326 208 175	383 235 230
	Pd/CZ-B	318 192 165	370 210 215
	Pd/CZ-YE	395 275 260	- 320 300
	Pd/CZ-BS	380 265 250	420 305 295

Influence of Alcohol on Performance of Ce_0.65Zr_0.35O₂and Its Corresponding Pd-only Catalyst in Ageing System

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