Production of ultrapure hydrogen in a PdeAg membrane reactor using noble metals supported on LaeSi oxides. Heterogeneous modeling for the water gas shift reaction

CAROLINA A. CORNAGLIA, JOHN MÚNERA, EDUARDO A. LOMBARDO; MARÍA E. ADROVER, MARISA N. PEDERNERA, DANIEL O. BORIO

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY

PERGAMON-ELSEVIER SCIENCE LTD

Lugar: Amsterdam; Año: 2013 vol. 38 p. 10485 - 10493

0360-3199

Two different catalysts, Rh(0.6% wt/wt)/La2O3(27% wt/wt)$SiO2 and Pt(0.6% wt/wt)/La2O3(27%)$SiO2, were tested in the WGS reaction. Their performances were first studied ina conventional fixed-bed reactor. Their activities were similar and they were both verystable. However, as Pt(0.6)/La2O3(27)$SiO2 showed a much higher selectivity to the desiredreaction, the performance of a membrane reactor employing this catalyst was studied. Theeffects of the H2O/CO ratio, space velocity, sweep gas flow rate and size of the catalystparticle on CO conversion and H2 recovery were studied at laboratory scale underisothermal conditions. A 1-D heterogeneous model was developed in order to properlyreproduce the experimental results obtaining good agreement between the simulationresults and laboratory data. The experimental and theoretical results confirm the existenceof significant external mass-transfer limitations in the fluid-particle interface for thesevery active formulations.