Materials Research | |
Dry reforming of methane at moderate temperatures over modified Co-Al Co-precipitated catalysts | |
Guilherme De Souza1  Nilson Romeu Marcilio1  Oscar William Perez-lopez1  | |
[1] ,Federal University of Rio Grande do Sul Department of Chemical Engineering Porto Alegre RS ,Brazil | |
关键词: Dry reforming of methane; Co-based catalyst; carbon deposition; precipitation method; mixed oxide; | |
DOI : 10.1590/1516-1439.269614 | |
来源: SciELO | |
【 摘 要 】
M-Co-Al (M = Ca, La, Li or Mg) materials were synthesised by co-precipitation and investigated for dry reforming of methane. Thermogravimetry, temperature-programmed oxidation, reduction and CO2 desorption, specific area and X-ray diffraction were utilised for characterisation. Activity tests were conducted at atmospheric pressure, temperatures between 400-550ºC , CH4/CO2 molar ratio of 1 and GHSV of 6000 NmL CH4·g-1·h-1. The partial substitution of Co by a third element increased the area and changed the acid/base properties, reducibility and crystallinity of the oxides. These modifications resulted in higher activity for dry reforming of methane, mainly related to the decrease in the acidity of the promoted materials and, consequently, lower carbon formation. The Li-modified sample presented the lowest coke deposition due to the increase in stronger basic sites. The Mg-promoted catalyst exhibited the best activity performance. This depicts the enhancement in the reducibility and acid/base properties found in the MgCoAl sample.
【 授权许可】
CC BY
All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License
【 预 览 】
Files | Size | Format | View |
---|---|---|---|
RO202005130153169ZK.pdf | 2116KB | download |