التفاصيل البيبلوغرافية
| العنوان: |
Dry reforming of methane over sub-stoichiometric NiAl2O4-mediated Ni/Al2O3 catalysts. |
| المؤلفون: |
Choya, Andoni1 (AUTHOR), de Rivas, Beatriz1 (AUTHOR), No, María Luisa2 (AUTHOR), Gutiérrez-Ortiz, Jose Ignacio1 (AUTHOR), López-Fonseca, Rubén1 (AUTHOR) ruben.lopez@ehu.eus |
| المصدر: |
Fuel. Feb2024:Part A, Vol. 358, pN.PAG-N.PAG. 1p. |
| مصطلحات موضوعية: |
*ALUMINUM oxide, *X-ray photoelectron spectroscopy, *CATALYSTS, *METHANE, *X-ray fluorescence, *CARBON nanotubes |
| مستخلص: |
[Display omitted] • Ni/Al 2 O 3 catalysts from sub-stoichiometric NiAl 2 O 4 were active for the dry reforming of methane. • Ni-deficient spinel precursors resulted in metallic particles sizes of 10 nm. • Available nickel surface area was optimised for a Ni/Al molar ratio of 0.15. • The 14% wt.Ni catalyst was the most active for the dry reforming of methane. • The optimal catalyst was also highly stable for extended time on stream (200 h) A series of Ni/Al 2 O 3 catalysts were prepared from substoichiometric NiAl 2 O 4 precursors (Ni/Al molar ratio between 0.5 and 0.05) were examined for the dry reforming of methane. The calcined spinel precursors and the corresponding reduced catalysts were characterised by N 2 physisorption, X-ray fluorescence, X-ray diffraction, Raman spectroscopy, electronic microscopy coupled to elemental mapping, X-ray photoelectron spectroscopy and temperature-programmed techniques. Compared with the stoichiometric counterpart, nickel species present in Ni-deficient precursors were mostly in the form of a spinelic phase. After high-temperature reduction, narrow particle size distributions centred at 10 nm were obtained. The largest available nickel surface area (18 m2 g−1) was exhibited by the catalyst derived from the precursor with a Ni/Al of 0.15. The NiAl 2 O 4 -mediated catalysts, especially those with Ni/Al molar ratio in the 0.15–0.25 range, exhibited a notable performance at 90,000 h−1 and 650 °C. The optimal catalyst (14%wt.%Ni), with 93%CH 4 and 80%CO 2 conversions, was also able to operate for 200 h despite the significant formation of carbonaceous nanotubes (around 1g C g CAT -1) and were examined. [ABSTRACT FROM AUTHOR] |
| قاعدة البيانات: |
Academic Search Index |
