Activity of Catalysts Reduced by Plasma in CO2 Methanation†

doi:10.7503/cjcu20150948

Abstract

Abstract:

Ni-Ce/γ-Al₂O₃ and Ni-Ce-LDHs/γ-Al₂O₃ catalyst precursors were synthesized by impregnation and in situ chemical-growing methods, respectively. These precursors were reduced by Ar-H₂ cold plasma jet and conventional H₂ thermal reduction. The evaluation of these catalysts were carried out in a CO₂ methanation reaction system. The results showed that the catalysts reduced by plasma had better catalytic activity, the reaction start-temperature with catalysts reduced by plasma was 20—30 ℃ lower than that with catalysts by conventional method. The catalysts were characterized by X-ray diffraction(XRD), transmission electron microscopy(TEM), CO₂-temperature programmed desorption(CO₂-TPD), as well as X-ray photoelectron spectrum(XPS). The results showed that plasma reduction could remarkably improve the dispersion of active components, the alkalinity of support and the size of crystal metal particles. It was these improvements that enhanced the activity of catalysts in methanation reaction.

Key words: Plasma, Nickel, Carbon dioxide, Methanation, Catalytic performance

CLC Number:

O643

TrendMD:

ZHANG Yanping,YANG Chunhui,CHEN Pan,RAN Tangchun,LI Jiao,YIN Yongxiang. Activity of Catalysts Reduced by Plasma in CO₂ Methanation^†[J]. Chem. J. Chinese Universities, 2016, 37(8): 1521.

Figures/Tables 10

Fig.1 Example diagram of free-carbon electricity to chemical energy

Fig.2 Schematic of catalyst reduced with plasma jet

Fig.3 Performance of catalyst LDHs-C-R(a) and LDHs-P-R(b) in CO2 methanation reaction

Fig.4 Performance of catalyst IMPs-C-R(a) and IMPs-P-R(b) in CO2 methanation reaction

Fig.5 Selectivity of catalysts LDHs-C-R and LDHs-P-R(A), IMPs-C-R and IMPs-P-R(B)

Fig.6 XRD patterns of catalysts IMPs(A) and LDHs(B) (A) a. IMPs, b. IMPs-C-R, c. IMPs-P-R; (B) a. LDHs, b. LDHs-C-R, c. LDHs-P-R.

Fig.7 TEM images of catalysts IMPs-C-R(A), IMPs-P-R(B), LDHs-C-R(C) and LDHs-P-R(D)

Fig.8 CO2-TPD profiles of catalysts prepared by different reduction methods (A) a. IMPs-C-R, b. IMPs-P-R; (B) a. LDHs-C-R, b. LDHs-P-R.

Table 1 CO2 desorption peak area over different catalysts

Catalyst	IMPs-C-R	IMPs-P-R	LDHs-C-R	LDHs-P-R
CO₂ desorption peak, β or (β+γ)	4.47	12.81	12.56	19.17

Fig.9 XPS spectra of O1s for catalysts reduced by different methods (A) LDHs-P-R; (B) LDHs-C-R.

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Activity of Catalysts Reduced by Plasma in CO₂ Methanation^†

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