Hydrogen production by water dissociation using ceramic membranes. Annual report for FY 2007.

Chen, L.; Dorris, S. E.; Emerson, J. E.; Lee, T. H.; Park, C. Y.; Picciolo, J. J.; Song, Shuangshuang

doi:10.2172/937404

Cited by 1 publication

(2 citation statements)

References 6 publications

(7 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…33,57,58,85 Regarding the stability of BFZ91 in a CO 2containing environment, we note that Balachandran et al have already conducted studies using CO 2 mole fractions of 50 and 75% in the stream. 86 Although long-term studies were not reported, the obtained J O 2 was higher than LSCF membranes operating under the same conditions. 86 Because the formation of BaCO 3 is favorable at high T and CO 2 , we would expect that any irreversible membrane deactivation at such conditions would have been immediate and would have lowered J O 2 significantly.…”

Section: Resultsmentioning

confidence: 82%

“…86 Although long-term studies were not reported, the obtained J O 2 was higher than LSCF membranes operating under the same conditions. 86 Because the formation of BaCO 3 is favorable at high T and CO 2 , we would expect that any irreversible membrane deactivation at such conditions would have been immediate and would have lowered J O 2 significantly. However, more detailed studies (outside the scope of this work) are required to understand the high resistance of BFZ91 against BaCO 3 formation.…”

Section: Resultsmentioning

confidence: 82%

See 1 more Smart Citation

Highly Durable C₂ Hydrocarbon Production via the Oxidative Coupling of Methane Using a BaFe_0.9Zr_0.1O_3−δ Mixed Ionic and Electronic Conducting Membrane and La₂O₃ Catalyst

et al. 2021

View full text Add to dashboard Cite

The oxidative coupling of methane (OCM) is an attractive technology for the production of ethane (C2H6) and ethylene (C2H4); and significant performance and efficiency gains as well as reduced carbon dioxide (CO2) emissions are expected when OCM takes place within mixed ionic and electronic conducting (MIEC) ceramic membrane reactors (CMRs). So far, research on OCM in CMRs has been limited to unstable and incompatible materials investigated under short-term measurements that hinder upscaling and commercial application. To this end, this work demonstrates long-term stable OCM performance enabled by a BaFe0.9Zr0.1O3−δ (BFZ91) perovskite utilized as the oxygen-ion MIEC membrane and lanthanum oxide (La2O3) used as the OCM catalyst. Experimental measurements conducted in the temperature (T) range of 750–900 °C and at inlet methane (CH4) mole fractions ( ) of 0–30% revealed a highly stable performance during 23 days of continuous operation, which was further confirmed by material characterization. Under the aforementioned operating conditions, BFZ91 offers a high oxygen (O2) permeation flux (J O2 ) between 0.5−1.5 (μmol/cm2/s); CH4 conversion (CCH4) reached ∼35% while the selectivities to C2H6 (SC2H6 ) and C2H4 (SC2H4 ) were as high as ∼50% and ∼40%, respectively, showing a strong dependency on the operating conditions. Yields of C2H6 (YC2H6 ) and C2H4 (YC2H4 ) in the range of 1–5% and 1–7%, respectively, were measured, with more C2H4 being produced at higher T. In the absence of La2O3, CCH4 and C2 (C2H6 and C2H4) yields are lower confirming that BFZ91 does not promote CH4 oxidation, reforming, or coupling on its surface at high rates. The OCM performance of BFZ91 with La2O3 was also found to be stable under partial O2 consumption and pure CH4 conditions. Furthermore, a detailed analysis of the mixture composition allowed the identification of the primary reactions in the OCM chemistry. Our results reveal that within our reactor, CH4 full oxidation to CO2 and steam (H2O) happens simultaneously with CH4 oxidation to C2H6 and H2O (both on the La2O3 catalyst), but the production of the valuable C2H4 is primarily taking place through the C2H6 non-oxidative dehydrogenation in the gas phase; this reaction was not found to proceed on the La2O3 catalyst. Besides the promise of the investigated materials toward commercialization, the methods to study the OCM chemistry and the membrane catalyst coupling presented here are expected to promote further advances in the field of OCM.

show abstract

Section: Resultsmentioning

confidence: 82%

Section: Resultsmentioning

confidence: 82%

Highly Durable C₂ Hydrocarbon Production via the Oxidative Coupling of Methane Using a BaFe_0.9Zr_0.1O_3−δ Mixed Ionic and Electronic Conducting Membrane and La₂O₃ Catalyst

et al. 2021

View full text Add to dashboard Cite

show abstract

Hydrogen production by water dissociation using ceramic membranes. Annual report for FY 2007.

Cited by 1 publication

References 6 publications

Highly Durable C₂ Hydrocarbon Production via the Oxidative Coupling of Methane Using a BaFe_0.9Zr_0.1O_3−δ Mixed Ionic and Electronic Conducting Membrane and La₂O₃ Catalyst

Highly Durable C₂ Hydrocarbon Production via the Oxidative Coupling of Methane Using a BaFe_0.9Zr_0.1O_3−δ Mixed Ionic and Electronic Conducting Membrane and La₂O₃ Catalyst

Contact Info

Product

Resources

About

Hydrogen production by water dissociation using ceramic membranes. Annual report for FY 2007.

Cited by 1 publication

References 6 publications

Highly Durable C2 Hydrocarbon Production via the Oxidative Coupling of Methane Using a BaFe0.9Zr0.1O3−δ Mixed Ionic and Electronic Conducting Membrane and La2O3 Catalyst

Highly Durable C2 Hydrocarbon Production via the Oxidative Coupling of Methane Using a BaFe0.9Zr0.1O3−δ Mixed Ionic and Electronic Conducting Membrane and La2O3 Catalyst

Contact Info

Product

Resources

About

Highly Durable C₂ Hydrocarbon Production via the Oxidative Coupling of Methane Using a BaFe_0.9Zr_0.1O_3−δ Mixed Ionic and Electronic Conducting Membrane and La₂O₃ Catalyst

Highly Durable C₂ Hydrocarbon Production via the Oxidative Coupling of Methane Using a BaFe_0.9Zr_0.1O_3−δ Mixed Ionic and Electronic Conducting Membrane and La₂O₃ Catalyst