Carbon Dioxide Reforming of Methane using an Isothermal Redox Membrane Reactor. Issue 7 (2nd June 2015)

• Record Type: Journal Article
• Authors: Michalsky, Ronald; Neuhaus, Dominique; Steinfeld, Aldo
• Is Part Of: Energy technology. Volume 3:Issue 7(2015:Jul.)
• Page Start: 784
• Page End: 789
• Publication Date: 2015-06-02
• Subjects: Energy development -- Periodicals; Power resources -- Periodicals; 333.79
• DOI: 10.1002/ente.201500065
• Languages: English
• ISSNs: 2194-4288

Abstract

<abstract abstract-type="main" xml:lang="en"> <title>Abstract</title> <p>The continuous production of carbon monoxide (CO) and hydrogen (H<sub>2</sub>) by dry reforming of methane (CH<sub>4</sub>) is demonstrated isothermally using a ceramic redox membrane in absence of additional catalysts. The reactor technology realizes the continuous splitting of CO<sub>2</sub> to CO on the inner side of a tubular membrane and the partial oxidation of CH<sub>4</sub> with the lattice oxygen to form syngas on the outer side. La<sub>0.6</sub>Sr<sub>0.4</sub>Co<sub>0.2</sub>Fe<sub>0.8</sub>O<sub>3‐<italic>δ</italic></sub> (LSCF) membranes evaluated at 840–1030 °C yielded up to 1.27 μmol <sub>CO</sub> <inline-formula><alternatives><tex-math notation="tex"><![CDATA[${{\rm g}{{- 1\hfill \atop {\rm LSCF}\hfill}}}$]]></tex-math><inline-graphic xlink:href="ark:/27927/pgj1m91q3n4" mimetype="image" xlink:type="simple" xmlns:xlink="http://www.w3.org/1999/xlink" /></alternatives></inline-formula> s<sup>−1</sup> from CO<sub>2</sub>, 3.77 μmol<inline-formula><alternatives><inline-graphic mimetype="image" xlink:href="ark:/27927/pgj1m91q0gt" xlink:type="simple" xmlns:xlink="http://www.w3.org/1999/xlink" /><mml:math altimg="urn:x-wiley:21944288:media:ENTE201500065:tex2gif-inf-12" overflow="scroll" xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mtext> </mml:mtext><mml:mrow><mml:mtext> H</mml:mtext><mml:msub><mml:mtext> </mml:mtext><mml:mrow><mml:mtext>2</mml:mtext></mml:mrow></mml:msub></mml:mrow></mml:msub></mml:math></alternatives></inline-formula> g<sup>−1</sup> s<sup>−1</sup> from CH<sub>4</sub>, and CO from CH<sub>4</sub> at approximately the same rate as CO from CO<sub>2</sub>. We compute the free energy of the oxygen vacancy formation for La<sub>0.5</sub>Sr<sub>0.5</sub>B<sub>0.5</sub>B′<sub>0.5</sub>O<sub>3−<italic>δ</italic></sub> (B, B′=Mn, Fe, Co, Cu) using electronic structure theory to understand how CO<sub>2</sub> reduction limits dry reforming of methane using LSCF and to show how the CO<sub>2</sub> conversion can be increased by using advanced redox materials such as La<sub>0.5</sub>Sr<sub>0.5</sub>MnO<sub>3−<italic>δ</italic></sub> and La<sub>0.5</sub>Sr<sub>0.5</sub>Mn<sub>0.5</sub>Co<sub>0.5</sub>O<sub>3−<italic>δ</italic></sub>.</p> </abstract>