Abstract
Dry reforming of methane was studied over Ni catalysts supported on γAl 2O 3, CeO 2, ZrO 2 and MgAl 2O 4 (670 °C, 1.5 bar, 16–20 l CH 4 ml catalyst −1 h −1). It is shown that MgAl 2O 4 supported Ni catalysts promoted with both CeO 2 and ZrO 2 are promising catalysts for dry reforming of methane with carbon dioxide. Within a certain composition range, the simultaneous promotion with CeO 2 and ZrO 2 has great influence on the amount of coke and the catalyst service time. XRD analyses indicate that formation of crystalline Ce x Zr 1− x O 2 mixed oxide phases occurs on double promotion. In particular, incorporation of low amounts of Zr in the CeO 2 fluorite structure provides stable dry reforming catalysis. As shown with TPR, promotion leads to a higher reduced state of Ni. SEM, XRD and TPR analyses demonstrate that highly dispersed, doubly promoted Ni catalysts with a strong metal-support interaction are essential for stable dry reforming and suppression of the formation of carbon filaments.
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