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CO2 mitigation by carbon nanotube formation during dry reforming of methane analyzed by factorial design combined with response surface methodology

2014; Elsevier BV; Volume: 35; Issue: 4 Linguagem: Inglês

10.1016/s1872-2067(14)60018-8

1872-2067

Tiago Pinheiro Braga, Regina Cláudia Rodrigues dos Santos, Bárbara Maria Campos Sales, Bruno R. da Silva, Antônio N. Pinheiro, Edson R. Leite, Antoninho Valentini,

Catalysis and Oxidation Reactions

A factorial experimental design was combined with response surface methodology (RSM) to optimize the catalyzed CO2 consumption by coke deposition and syngas production during the dry reforming of CH4. The CH4/CO2 feed ratio and the reaction temperature were chosen as the variables, and the selected responses were CH4 and CO2 conversion, the H2/CO ratio, and coke deposition. The optimal reaction conditions were found to be a CH4/CO2 feed ratio of approximately 3 at 700 °C, producing a large quantity of coke and realizing high CO2 conversion. Furthermore, Raman results showed that the CH4/CO2 ratio and reaction temperature affect the system's response, particularly the characteristics of the coke produced, which indicates the formation of carbon nanotubes and amorphous carbon.