Pd/CeO2/γ-Al2O3 Catalyst with Low Loading for Catalytic Oxidation of VOCs

doi:10.15541/jim20180523

Abstract

Abstract:

The Pd/γ-Al₂O₃ and Pd/CeO₂/γ-Al₂O₃catalysts with 0.03wt% Pd loading were successfully synthesized via simple direct-adsorption method, and evaluated for the oxidation of volatile organic compounds (VOCs). The morphology, structure, and surface properties of the synthesized samples were characterized by X-ray diffraction (XRD), N₂ adsorption-desorption (BET method), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), temperature-programmed reduction of H₂(H₂-TPR). The temperatures for conversion of 98% toluene, acetone and ethyl acetate over the Pd/CeO₂/γ-Al₂O₃ catalyst were 205, 220 and 275 ℃ under the conditions of VOCs volume fraction at 0.1% and gas hourly space velocity (GHSV) at 18000 mL/(g·h), respectively, which were 15, 15 and 20 ℃ lower than that of Pd/γ-Al₂O₃catalyst. The Pd/CeO₂/γ-Al₂O₃ exhibited outstanding catalytic activity, stability and selectivity even at high gas hourly space velocity. The results indicated the addition of ceria to alumina influenced the physico- chemical properties of the materials and their catalytic activities. It also revealed that Pd/CeO₂/γ-Al₂O₃ possessed Ce ³⁺and high content of PdO, and the main active PdO species were well-dispersed on the surface of the γ-Al₂O₃ support. In addition, the strong metal-support interaction between PdO and non-stoichiometric cerium oxides enhanced catalytic performance of the Pd/CeO₂/γ-Al₂O₃ for oxidation of VOCs.

Key words: Pd/CeO₂/γ-Al₂O₃, cerium, toluene, Volatile organic compounds (VOCs), catalytic oxidation

CLC Number:

O614
O621

LI Si-Han, ZHANG Chao, WU Chen-Liang, ZHANG He-Feng, YAN Xin-Huan. Pd/CeO₂/γ-Al₂O₃ Catalyst with Low Loading for Catalytic Oxidation of VOCs[J]. Journal of Inorganic Materials, 2019, 34(8): 827-833.

Figures/Tables 10

Fig. 1 Catalytic oxidation of VOCs(a) toluene, (b) acetone, (c) ethyl acetate over Pd/γ-Al2O3 and Pd/CeO2/γ-Al2O3

Fig. 2 Catalytic oxidation of toluene over Pd/CeO2/γ-Al2O3 at various GHSVs

Fig. 3 Stability tests for toluene oxidation with time-on- stream over Pd/CeO2/γ-Al2O3

Fig. 4 Effect of water vapor on toluene conversion over the Pd/Al2O3 and Pd/Ce2O/Al2O3 catalyst under the conditions of toluene concentration = 1×10-3, water vapor concentration = 5.0vol% and GHSV = 18000 mL/(g·h)

Table 1 Physical structure parameters of Al2O3, Pd/Al2O3 and Pd/CeO2/Al2O3

Sample	Surface area /(m²·g^-1)	Pore size/nm	Pore volume /(cm³·g^-1)
γ-Al₂O₃	357	5.13	0.53
Pd/γ-Al₂O₃	345	5.07	0.52
Pd/CeO₂/γ-Al₂O₃	339	5.02	0.49

Fig. 5 XRD patterns of (a) γ-Al2O3, (b) Pd/γ-Al2O3 and (c) Pd/CeO2/γ-Al2O3

Fig. 6 TEM images and Pd NPs size distribution of (a) Pd/γ-Al2O3 and (b) Pd/CeO2/γ-Al2O3

Fig. 7 XPS spectra of (a) Pd 3d and (b) Ce 3d for Pd/γ-Al2O3 and Pd/CeO2/γ-Al2O3

Table 2 XPS results of Pd/γ-Al2O3 and Pd/CeO2/γ-Al2O3

Catalyst	Relative content/wt%
Catalyst	Pd	PdO	Ce³⁺	Ce⁴⁺
Pd/γ-Al₂O₃	34.2	65.8	—	—
Pd/CeO₂/γ-Al₂O₃	0	100	14.5	85.5

Fig. 8 H2-TPR profiles of (a) Pd/γ-Al2O3 and (b) Pd/CeO2/γ- Al2O3

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Pd/CeO₂/γ-Al₂O₃ Catalyst with Low Loading for Catalytic Oxidation of VOCs

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