A novel porous‐dense dual‐layer composite membrane reactor with long‐term stability

Abstract

A porous-dense dual-layer composite membrane reactor was proposed. The dual-layer composite membrane composed of dense 0.5 wt % Nb 2 O 5 -doped SrCo 0.8 Fe 0.2 O 3-d (SCFNb) layer and porous Ba 0.3 Sr 0.7 Fe 0.9 Mo 0.1 O 3-d (BSFM) layer was prepared. The stability of SCFNb membrane reactor was improved significantly by the porous-dense dual-layer design philosophy. The porous BSFM surface-coating layer can effectively reduce the corrosion of the reducing atmosphere to the membrane, whereas the dense SCFNb layer permeated oxygen effectively. Compared with single-layer dense SCFNb membrane reactor, no degradation of performance was observed in the dual-layer membrane reactor under partial oxidation of methane during continuously operating for 1500 h at 850 C. At 900 C, oxygen flux of 18.6 mL (STP: Standard Temperature and Pressure) cm 22 min 21, hydrogen production of 53.67 mL (STP) cm 22 min 21, CH 4 conversion of 99.34% and CO selectivity of about 94% were achieved.

Mixed Ionic-Electronic Conducting Membranes (MIEC) for Their Application in Membrane Reactors: A Review

“…Jiang et al [223] prepared a planar membrane of SrCo 0.8 Fe 0.2 O 3-δ doped with 0.5 wt.% of Nb 2 O 5 with a porous Ba 0.3 Sr 0.7 Fe 0.9 Mo 0.1 O 3-δ layer, which protects the system from reducing the POM atmosphere. A stable oxygen flow of 9.7 × 10 −6 mol cm −2 s −1 was achieved in a 1500-h long-term experiment at 850 • C without any remarkable change in the membrane structure.…”