Preparation and Characterization of Pd-Cu/hydroxyapatite Catalyst and Its Catalytic Performance for Room-temperature CO Oxidation in Humid Circumstances†

doi:10.7503/cjcu20200127

Abstract

Abstract:

Hydroxyapatite supports(HAP-SG, HAP-HT) were prepared by sol-gel and hydrothermal methods, respectively. Pd-Cu/HAP catalysts(PC-SG, PC-HT) were synthesized by an impregnation method, and the catalytic activities toward CO oxidation at room temperature and in humid circumstances were investigated. The Pd-Cu/HAP catalysts were characterized by inductively coupled plasma optical emission spectrometry(ICP-OES), N₂-physisorption, X-ray diffraction(XRD), Fourier transform infrared(FTIR), H₂ temperature programmed reduction(H₂-TPR), CO₂ temperature programmed desorption(CO₂-TPD), X-ray photoelectron spectroscopy(XPS)and CO in-situ diffuse reflection using Fourier transform spectroscopy(DRIFTS). The results show that compared with PC-SG, PC-HT possesses the larger specific surface area and pore volume, contains more Cu₂Cl(OH)₃ species with stronger interactions with Pd species and support; more importantly, Pd⁺ species with stronger CO activation ability and more Cu⁺ species with stronger redox property, as well as fewer and weaker basic sites present in PC-HT, thus PC-HT exhibits more excellent CO catalytic oxidation performance for room-temperature CO oxidation in humid circumstances.

Key words: Pd-Cu/hydroxyapatite, Room temperature and in humid circumstances, CO catalytic oxidation, Redox, Pd⁺ species

CLC Number:

O643.36

TrendMD:

LI Xiao,XING Lisha,ZHAO Wanjun,WANG Yongzhao,ZHAO Yongxiang. Preparation and Characterization of Pd-Cu/hydroxyapatite Catalyst and Its Catalytic Performance for Room-temperature CO Oxidation in Humid Circumstances^†[J]. Chem. J. Chinese Universities, 2020, 41(7): 1600.

Figures/Tables 13

References 37

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Sample	w_Pd(%)	w_Cu(%)	n_Ca/n_P
PC-SG	0.37	11.00	1.72
PC-HT	0.38	11.27	1.69

Sample	w_Pd(%)	w_Cu(%)	n_Ca/n_P
PC-SG	0.37	11.00	1.72
PC-HT	0.38	11.27	1.69

Sample	S_BET/(m²·g^-1)	Pore volume/(mL·g^-1)	Pore size/nm
HAP-SG	12.8	0.05	16.6
HAP-HT	46.2	0.30	25.6
PC-SG	8.2	0.06	29.6
PC-HT	36.2	0.22	24.7

Sample	S_BET/(m²·g^-1)	Pore volume/(mL·g^-1)	Pore size/nm
HAP-SG	12.8	0.05	16.6
HAP-HT	46.2	0.30	25.6
PC-SG	8.2	0.06	29.6
PC-HT	36.2	0.22	24.7

Sample	H₂ consumption/(μmol·g^-1)
Sample	Peak α	Peak β	Total
PC-SG	746	1060	1806
PC-HT	718	1016	1734