Influence of feed rate and testing variables for low-temperature tri-reforming of methane on the Ni@MWCNT/Ce catalyst

Author(s)

Kozonoe, Camila Emilia ^[1] ; Brito Alves, Rita M. ^[1] ; Schmal, Martin ^{[1, 2]}

Affiliation

^[1] Univ Sao Paulo, Dept Chem Engn, Sao Paulo - Brazil

^[2] Univ Fed Rio de Janeiro, COPPE PEQ Nucat, Rio De Janeiro - Brazil

• Document type: Journal article
• Source: FUEL; v. 281, DEC 1 2020.
• Web of Science Citations: 3

Abstract

This work proposes the synthesis of the Ni@MWCNT/Ce catalyst and evaluation the influence of feed rate and testing variables on the tri-reforming of methane. Morphology and incorporation of the nanoparticles in carbon nanotubes were investigated by X-ray diffraction, scanning electron microscopy (SEM), transmission electron microscopy (TEM), specific surface area (BET), thermogravimetric analyses (TGA) and Raman spectroscopy. The 5%Ni@MWCNT/5%Ce catalyst was initially tested at 700 degrees C for 44 h and remained stable throughout the test period. The catalyst was evaluated for the tri-reforming of methane, varying temperatures, space velocities, and feed rate concentrations of water and oxygen, using experimental design. The highest CH4 conversions were obtained for similar feed condition (CH4:CO2:H2O:O-2:N-2) (1:0.34:0.23:0.5:2.1) but for different space velocities and temperatures. Experiment C25 presented 91% conversion of CH4 and 30.8% of CO2 with a H-2/CO = 1.88 at 700 degrees C and space velocity of 2000 ml/g.min. However, the highest conversions (96.8% CH4, 38.7% of CO2 and the ratio H-2/CO = 1.88) were obtained for a higher temperature (750 degrees C) and lower space velocity 1250 ml/g.min, which indicates influence of residence time and kinetics. Raman spectra evidenced clearly total absence of coke formation. The CNT support was decomposed or burnt during the reaction resulting in unsupported oxides and nickel metallic particles well dispersed or deposited over residual carbon or growth filaments. (AU)

• FAPESP's process: 14/50279-4 - Brasil Research Centre for Gas Innovation
• Grantee: Julio Romano Meneghini
• Support Opportunities: Research Grants - Research Centers in Engineering Program