Ru/γ-Al2O3 and Plasma Co-activation for CO2 Methanation: Effect of Catalytic Material Preparation Method

doi:10.15541/jim20190229

Abstract

Abstract:

The synergy of plasma and catalytic materials for CO₂ methanation provides the possibility for CO₂ reuse. The preparation method of catalytic materials plays an important role on their structure and performance. In this work, Ru/γ-Al₂O₃-P and Ru/γ-Al₂O₃-T catalytic materials were prepared by atmospheric-pressure H₂ plasma reduction and H₂ thermal reduction, respectively, using Ru/γ-Al₂O₃ precursor prepared by incipient wetness impregnation. The catalytic activity of Ru/γ-Al₂O₃ prepared by different methods was evaluated during atmospheric-pressure plasma reduction for CO₂ methanation reaction. Different techniques were used to investigate the effect of preparation methods on the structure of Ru/γ-Al₂O₃, analyze the influences of structural factor on the catalytic activity of Ru/γ-Al₂O₃, and discuss the preparation mechanism of Ru/γ-Al₂O₃-P and Ru/γ-Al₂O₃-T. The results show that the CO₂ conversion of γ-Al₂O₃ support is 24.8% under the combination of atmospheric-pressure plasma, and the main product is CO. However, the main CO₂ catalytic product of Ru/γ-Al₂O₃ is methane under the combination of atmospheric-pressure plasma. CO₂ conversion over Ru/γ-Al₂O₃-P is 77.3%, which is higher than that over Ru/γ-Al₂O₃-T (69.9%). Higher catalytic activity of Ru/γ-Al₂O₃-P is ascribed to the higher metallic Ru ratio and Ru/Al atomic ratio, as well as the smaller and higher dispersion of Ru nanoparticles. This work proves that highly active supported metal catalytic materials can be prepared by atmospheric-pressure H₂ plasma.

Key words: Ru/γ-Al₂O₃, plasma reduction, thermal reduction, CO₂ methanation

CLC Number:

TQ174

DONG Mengyue, XU Weiwei, ZHAO Jing, DI Lanbo, ZHANG Xiuling. Ru/γ-Al₂O₃ and Plasma Co-activation for CO₂ Methanation: Effect of Catalytic Material Preparation Method[J]. Journal of Inorganic Materials, 2020, 35(5): 567-572.

Figures/Tables 7

Fig. 1 Schematic diagram of Ru/γ-Al2O3 and plasma co-activation for CO2 methanation

Fig. 2 Catalytic activity and carbon balance of γ-Al2O3, Ru/γ-Al2O3-P and Ru/γ-Al2O3-T for CO2 methanation under plasma

Fig. 3 XRD patterns of γ-Al2O3, Ru/γ-Al2O3-P and Ru/γ-Al2O3-T

Fig. 4 (a) Survey XPS spectra and (b) Ru3p XPS spectra for Ru/γ-Al2O3-P and Ru/γ-Al2O3-T

Table 1 Valence state proportion of Ru, atomic ratio of Ru/Al and size of Ru nanoparticles in Ru/γ-Al2O3-P and Ru/γ-Al2O3-T

Sample	Ru⁰/(Ru⁰+Ru³⁺)	Ru/Al^a	D_Ru/nm^b
Ru/γ-Al₂O₃-P	70.6%	0.0283	(2.3±0.5)
Ru/γ-Al₂O₃-T	66.7%	0.0211	(3.3±1.2)

Fig. 5 TEM images of (a) Ru/γ-Al2O3-P and (b) Ru/γ-Al2O3-T

Fig. 6 Schematic illustration of proposed preparation mechanism for Ru/γ-Al2O3-P and Ru/γ-Al2O3-T

References 17

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Ru/γ-Al₂O₃ and Plasma Co-activation for CO₂ Methanation: Effect of Catalytic Material Preparation Method

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