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type     January, 2009

Synthesis gas generation by chemical-looping reforming using a Ni-based oxygen carrier

Luis F. de Diego, María Ortiz, Francisco García-Labiano, Juan Adánez, Alberto Abad, and Pilar Gayán

This work presents the experimental results obtained during auto-thermal chemical looping reforming (CLR) in a 900 Wth circulating fluidized bed reactor using methane as fuel. An oxygen carrier based on NiO and supported on γ-Al2O3 was used during more than 50 hours of operation and the effect of different operating variables, like fuel reactor temperature, H2O/CH4 molar ratio and solid circulation rate, on CH4 conversion and gas product distribution was analyzed. It was found that in all operating conditions CH4 conversion was very high (>98%) and the most important variable affecting to the gas product distribution was the solid circulation rate, that is, NiO/CH4 molar ratio. During operation the oxygen carrier particles maintained their physical and chemical properties. These results suggest that this oxygen carrier could have a high durability, being a suitable oxygen carrier for a CLR system.

© 2008 Elsevier Ltd. All rights reserved.

Keywords: Chemical looping; Oxygen carrier; Nickel Oxide; Fluidized bed.

Source: Greenhouse Gas Control Technologies (GHGT) conference, 16-20 November 2008

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