On-site pure hydrogen production by methane steam reforming in high flux membrane reactor: Experimental validation, model predictions and membrane inhibition

TY - JOUR

T1 - On-site pure hydrogen production by methane steam reforming in high flux membrane reactor

T2 - Experimental validation, model predictions and membrane inhibition

AU - Patrascu, Michael

AU - Sheintuch, Moshe

N1 - Publisher Copyright: © 2014 Elsevier B.V.

PY - 2015/2/5

Y1 - 2015/2/5

N2 - Measurements in a membrane methane reformer packed with catalytic (Pt(3)Ni(10)/CeO2) foams and equipped with a 175cm2 Pd membrane showed that high conversion and high hydrogen recovery can be achieved with sweep flow and high pressures (over 90% conversion and over 80% H2 recovery at 525°C for 0.25NL/min CH4 feed flow). Increasing pressure above 10bar does not lead to higher fluxes due to stronger permeance inhibition. A mathematical model predicts the reactor's performance well in terms of axial temperature profile, exit compositions and permeate flow, when membrane permeance is calibrated with experimental results. However this value is significantly lower (by ~80%) than values measured in pure H2 in the absence of reaction. This apparent permeance inhibition is attributed to coadsorbates, although the only strong inhibitor in these conditions is thought to be CO, and its concentration (<1%) cannot justify this strong inhibition. We suggest a mechanistic explanation for this. Concentration polarization effects are not negligible but a 1-D model solution, using an approximation of this effect, shows it cannot account for this large inhibition.

AB - Measurements in a membrane methane reformer packed with catalytic (Pt(3)Ni(10)/CeO2) foams and equipped with a 175cm2 Pd membrane showed that high conversion and high hydrogen recovery can be achieved with sweep flow and high pressures (over 90% conversion and over 80% H2 recovery at 525°C for 0.25NL/min CH4 feed flow). Increasing pressure above 10bar does not lead to higher fluxes due to stronger permeance inhibition. A mathematical model predicts the reactor's performance well in terms of axial temperature profile, exit compositions and permeate flow, when membrane permeance is calibrated with experimental results. However this value is significantly lower (by ~80%) than values measured in pure H2 in the absence of reaction. This apparent permeance inhibition is attributed to coadsorbates, although the only strong inhibitor in these conditions is thought to be CO, and its concentration (<1%) cannot justify this strong inhibition. We suggest a mechanistic explanation for this. Concentration polarization effects are not negligible but a 1-D model solution, using an approximation of this effect, shows it cannot account for this large inhibition.

KW - Hydrogen production

KW - Membrane reactor

KW - Methane steam reforming

KW - Modeling

KW - Pd membrane

KW - Permeance inhibition

UR - http://www.scopus.com/inward/record.url?scp=84909606895&partnerID=8YFLogxK

U2 - 10.1016/j.cej.2014.10.042

DO - 10.1016/j.cej.2014.10.042

M3 - 文章

AN - SCOPUS:84909606895

SN - 1385-8947

VL - 262

SP - 862

EP - 874

JO - Chemical Engineering Journal

JF - Chemical Engineering Journal

ER -