(515b) Highly Efficient Methane Reforming over the 0.15wt% Ru/y-Al2O3 Catalyst in the 5um Pd-Ag Film Membrane Reformer
- Conference: AIChE Annual Meeting
- Year: 2015
- Proceeding: 2015 AIChE Annual Meeting Proceedings
- Group: Catalysis and Reaction Engineering Division
- Time: Wednesday, November 11, 2015 - 12:50pm-1:10pm
methane reforming over the 0.15wt% Ru/y-Al2O3 catalyst in
the 5um Pd-Ag film membrane reformer
David S. A. Simakov and Yuriy Román-Leshkov
Chemical Engineering, MIT, Cambridge MA 02139, USA
gas is an abundant, cheap and relatively clean source of energy and chemical
feedstocks, which can be reformed to syngas (CH4 + H2O =
CO + 3H2), requiring however temperatures above 850°C
. Membrane catalytic reformers can provide high CH4 conversions below
650°C by selective separation of H2
(providing also a source of extra-pure H2) , but highly active
and stable catalysts are required. Commercial Ni-based catalysts do not have
sufficient activity at these temperatures and deactivate rapidly by coking,
particularly at (highly desirable) low steam/carbon ratios. In our recent work
we have demonstrated that the ultra-low loading 0.15wt% Ru/y-Al2O3
catalyst is highly active in low temperature CH4 reforming and has
excellent stability at low steam/carbon ratios . Herein, we demonstrate the
implementation of this catalyst in a membrane reformer, using the supported 5um
Pd-Ag film membrane for H2 separation. Conversions well above the
equilibrium were achieved (Fig. 1a), generating 3.5 mol of ultra-pure H2 per
mol of CH4 fed at the maximum (Fig. 1b). Importantly, the maximal
power density of this (6 inch length, 0.5 inch OD) unit was 0.9kW/L (if the H2
generated is fed to a 60% efficient fuel cell). No significant deactivation was
observed after 200h of operation. The feasibility of the low steam/carbon ratio
(S/C=1, 2) and of dry (CO2) reforming was also investigated.
 Simakov, D. S. A., Wright, M. M., Ahmed, S., Mokheimer E. M. A.
& Román-Leshkov, Y. Solar thermal reforming of natural gas: a review on
chemistry, catalysis and system design. Catal. Sci. Technol. 5,
 Said S. A. M., Simakov D. S. A., Mokheimer E. M. A., Habib M. A.,
Ahmed, S., Waseeuddin M. & Román-Leshkov Y. Computational fluid dynamics
study of hydrogen generation by low temperature methane reforming in a membrane
reactor. Int. J. Hydrogen Energy. 40, 3158?3169 (2015).
 Simakov, D. S. A., Luo H. Y. & Román-Leshkov, Y. Ultra-low
loading Ru/g-Al2O3: a highly active and
stable catalyst for low temperature solar thermal reforming of methane. Appl.
Catal. B: Environ. 169, 540?549 (2015).