Performance study of heptane reforming in the dense ceramic membrane reactors

Abstract

in Wiley InterScience (www.interscience.wiley.com).Heptane reforming was investigated in three dense ceramic membrane reactors, where the membranes were modified differently with reforming catalyst. Each reactor displayed distinctive catalytic behavior. The reactor with a bare membrane showed low catalytic activity and low oxygen permeation flux (J O2 ), but gave stable performance. The left two membranes reactors modified with catalyst both displayed shift processes at the preliminary stage of membrane reaction, not only in J O2 but also in the selectivity of all products. Moreover, the membrane reactor with more catalyst gave higher performance in the case of J O2 and CO selectivity. The observed shift phenomena are due to the activation of catalyst on the membrane surface, and the different amounts of catalyst produce different impaction on the membrane reactions. On the basis of the results in three membrane reactors, a reaction pathway of hydrocarbon reforming in dense ceramic membrane reactor is proposed. Being some different from combustion and reforming mechanism (CRR), hydrocarbon reforming in dense ceramic membrane reactor has its own characteristics. Figure 11. The schematic of hydrocarbon reforming in the dense ceramic membrane reactor.

A Novel Cobalt-Free, CO2-Stable, and Reduction-Tolerant Dual-Phase Oxygen-Permeable Membrane

“…Dense oxygen permeation membranes with mixed ionic–electronic conducting (MIEC) ability are attracting ever-increasing attention because of their potential applications in producing pure oxygen from air, , partial oxidation of methane to syngas, − and oxyfuel combustion for CO 2 capture , and some other applications as membrane reactors. , Traditional oxygen permeation membranes are usually made of typical perovskite-type oxides, such as La 0.6 Sr 0.4 Co 0.8 Fe 0.2 O 3−δ , Ba 0.5 Sr 0.5 Co 0.8 Fe 0.2 O 3−δ , , and SrCo 0.8 Fe 0.2 O 3−δ . , These materials generally show high oxygen permeation ability; however, the poor chemical and structure stability under CO 2 - or SO 2 -containing atmospheres or atmospheres with a low oxygen partial pressure ,, hampers their widespread applications.…”

Dense ceramic catalytic membranes and membrane reactors for energy and environmental applications

“…At 850 1C, an optimized heptane conversion of 100%, a CO selectivity of 91-93% and H 2 selectivity of 95-97% were achieved. In a recent paper by this group, 114 three BSCF membrane reactors modified with different catalysts were designed to reveal the pathway of hydrocarbon reforming. A distinctive oxidation reforming mechanism of heptane in a BSCF membrane reactor was observed and a possible reaction pathway is proposed.…”