Influence of Calcination Temperature on Performance of NiO/γ-Al2O3 Catalyst for CO2-CH4 Reforming to Produce Syngas

doi:10.15541/jim20150382

Abstract

Abstract:

A series of NiO/γ-Al₂O₃ catalysts for CH₄/CO₂ reforming were prepared by altering calcination temperature using hydrolysis-deposition method, and recorded as cat-500, cat-600, cat-700, and cat-800 according to the calcination temperature. XRD and H₂-TPR results showed that there was a strong metal-support interaction (SMSI) in the form of NiAl₂O₄ spinel in the prepared catalyst when the calcination temperature was as high as 700 ℃. Results of XRD, TG-DTG and TPH for the spent catalysts showed that the Ni grain size of cat-700 and cat-800 catalysts was 9.8 nm and 8.7 nm, respectively, lower than that of cat-500 and cat-600 catalysts (15.7 nm and 13.6 nm, respectively), indicating well dispersion of Ni grain. The deposited carbon during reaction was assigned to filamentous one, massive accumulation of which would increase bed pressure drop and decrease catalyst performance. Long term stability test demonstrated that the conversion of CO₂ over cat-800 catalyst was up to 95% and kept stable in 110 h.

Key words: CH₄/CO₂ reforming, NiO/γ-Al₂O₃ catalyst, calcination temperature, NiAl₂O₄ spinel

CLC Number:

O643

MO Wen-Long, MA Feng-Yun, LIU Yue-E, LIU Jing-Mei, ZHONG Mei, Aisha· Nulahong. Influence of Calcination Temperature on Performance of NiO/γ-Al₂O₃ Catalyst for CO₂-CH₄ Reforming to Produce Syngas[J]. Journal of Inorganic Materials, 2016, 31(3): 234-240.

Figures/Tables 10

Table 1 Textural properties of the catalysts

Catalysts	A/(m²·g^-1)	V/(m³·g^-1)	d/nm
γ-Al₂O₃	197	0.42	3.24
cat-500	154	0.22	3.90
cat-600	150	0.21	3.91
cat-700	133	0.20	4.05
cat-800	107	0.17	4.08

Fig. 1 XRD patterns of the catalysts

Fig. 2 H2-TPR spectra of the catalysts

Fig. 3 (a) CO2-TPD and (b) CH4-TPD profiles of the catalysts

Fig. 4 Conversion and selectivity of the catalysts

Fig. 5 Conversion of CH4 over cat-800 catalyst

Fig. 6 XRD patterns of spent catalysts

Fig. 7 TG-DTG curves of spent catalysts

Fig. 8 TPH results of spent catalysts

Fig. 9 Stability test over cat-500 and cat-800 catalysts

References 17

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Influence of Calcination Temperature on Performance of NiO/γ-Al₂O₃ Catalyst for CO₂-CH₄ Reforming to Produce Syngas

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