Catalytic Pd0.77Ag0.23 alloy membrane reactor for high temperature water-gas shift reaction: Methane suppression

Pati, Subhasis; Ashok, Jangam; Wang, Zhigang; Dewangan, Nikita; Wai, Ming Hui; Kawi, Sibudjing

doi:10.1016/j.cej.2018.12.112

Cited by 65 publications

(22 citation statements)

References 45 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The most studied metallic membrane is a Pd‐based membrane as it can operate at the temperature range of 300–600°C 4–7 . The properties of Pd‐based membranes can be effectively improved by alloying with other metals 8–10 . The ductility of the Pd‐based alloy allows it to be processed into thin and defect‐free membranes, 10,11 which enable it to achieve a high hydrogen flux.…”

Section: Introductionmentioning

confidence: 99%

One‐step thermal processing of BaCe₀_.₈Y₀_.₂O₃_−δ hydrogen permeable multichannel hollow fiber membrane

et al. 2022

View full text Add to dashboard Cite

BaCe0.8Y0.2O3−δ (BCY) is the most widely studied proton‐conducting material and is frequently fabricated as a dense membrane for hydrogen separation. However, the limitation of preparing dense BCY membranes is the extremely high sintering temperature (>1500°C). Herein, the BCY 7‐channel hollow fiber membrane was prepared by a one‐step thermal processing (OSTP) with Co2O3 as a sintering aid. The results showed that the addition of 1 wt.% Co2O3 at a reduced temperature of 1350°C was the optimum composition and sintering condition for densification and forming a single perovskite‐phase structure. The hydrogen permeation flux of the BCY hollow fiber membrane reached up to 0.34 ml min−1 cm−2 at 900°C. The long‐term stability test was conducted for 300 h. The successful attempt of such a strategy provides a green and straightforward path for the preparation of dense ceramic proton‐conducting membranes on a large scale. This promotes its industrial application in high‐temperature hydrogen separation.

show abstract

Section: Introductionmentioning

confidence: 99%

One‐step thermal processing of BaCe₀_.₈Y₀_.₂O₃_−δ hydrogen permeable multichannel hollow fiber membrane

et al. 2022

View full text Add to dashboard Cite

show abstract

“…Coupling the steam reforming reaction with in situ CO 2 removal, sorption-enhanced steam reforming (SESR) (eq ) provides an effective means for achieving high-purity hydrogen (usually greater than 96%). − In the SESR process, the SR reaction (eq ) takes place simultaneously with the WGS reaction (eq ) and CO 2 removal (eq ); therefore, the thermodynamic equilibrium of SR can be shifted toward the H 2 production side and increase the concentration of hydrogen. The SESR process has been reported to reduce the reaction temperature of the conventional SR process by about 100 °C, showing advantages to other approaches, e.g., membrane reactors . In addition, the SESR process can also minimize the formation of coke .…”

Section: Introductionmentioning

confidence: 99%

“…The SESR process has been reported to reduce the reaction temperature of the conventional SR process by about 100 °C, 40 showing advantages to other approaches, e.g., membrane reactors. 41 In addition, the SESR process can also minimize the formation of coke. 42 All of these have shown the significant advantages of the SESR process for the production of hydrogen from various feedstocks, e.g., methane, 43 methanol, 44,45 ethanol, 46 glycerol, 39 and acetic acid.…”

Section: ■ Introductionmentioning

confidence: 99%

Hydrogen Production from Sorption-Enhanced Steam Reforming of Phenol over a Ni–Ca–Al–O Bifunctional Catalyst

Dang

Yang

et al. 2020

ACS Sustainable Chem. Eng.

View full text Add to dashboard Cite

Phenol is one of the major products of bio-oil derived from biomass pyrolysis. Sorption-enhanced steam reforming of phenol (SESRP) aiming to produce high-purity H2 has been carried out over Ni–Ca–Al–O bifunctional catalysts. The effect of bifunctional catalyst composition (Ni content, Ca/Al ratio) on H2 concentration, H2 yield, and phenol conversion was studied. The results indicated that 5Ni-CA2.8 was the optimized catalyst, over which 98.88% purity of H2 and ∼100% conversion of phenol were achieved under the optimum reaction conditions. The 5Ni-CA2.8 catalyst also provided excellent stability for 50 SESRP–desorption cycles (∼100 h), in which the H2 concentration and phenol conversion stabilized at 98 and 100%, respectively. Meanwhile, no coke was found during the long-term stability test.

show abstract

“…There is also a method to achieve high and stable hydrogen permeability of palladium-silver films at low temperatures by coating the surface [13]. The formation of Pd-Ag alloy can effectively increase hydrogen permeability of Pd membranes [14], and simultaneously improve the durability and resistance to hydrogen embrittlement at temperatures below 573 K [15], which focused great attention from both the academia and industry [16][17][18][19]. The content of silver determines the critical temperature of the α-β transition, as well as the hydrogen permeability of supported Pd-Ag alloy membranes [2,19], whereas it is not easy to control the Ag content, microstructure and morphology during the fabrication process.…”

Section: Introductionmentioning

confidence: 99%

Microstructural Investigation and On-Site Repair of Thin Pd-Ag Alloy Membranes

Tang

Bao

et al. 2020

Membranes

View full text Add to dashboard Cite

Pd membranes act in an important role in H2 purification and H2 production in membrane reactors. Pd-Ag alloy membranes fabricated by consecutive electroless- and electroplating process on alumina tubes exhibited good stability under stringent heating/cooling cycles at a ramp rate of 10 K/min, imitating practical fast initiation or emergency shutdown conditions. Bilayer Pd-Ag membranes can form dense and uniform alloy after thermal treatment for 24 h at 823 K under H2 atmosphere, despite a porous structure due to the development of liquid-like properties above Tamman temperature to enforce the migrativity. On the contrary, alloying under N2 atmosphere resulted in a Pd-enriched layer. This led to a lower H2 flux but superior thermal stability compared to that alloying under H2 atmosphere. The trilayer approach of electroless-plated Pd, electro-polated Ag and electroless-plated Pd is not suitable to achieve homogeneous Pd-Ag alloys, which, on the other hand, presented the occurrence of a small gap between top Pd layer and middle Ag layer, probably due to insufficient wetting during plating process. An on-site repair treatment in analogous to MOCVD (Metal-organic Chemical Vapor Deposition) process was first proposed to extend the lifetime of Pd-Ag membrane, i.e., by vaporizing, and subsequent decomposition of Ag(OOCC2F5) powders to “preferentially” block the pinholes under vacuum and at working temperature of ca. 473–673 K, which effectively reduced the N2 flux by 57.4% compared to the initial value. The H2 flux, however, declined by 16.7% due to carbon deposition on the membrane surface, which requires further investigation. This approach shows some potential for on-site repair without disassembly or cooling to room temperature.

show abstract

Catalytic Pd0.77Ag0.23 alloy membrane reactor for high temperature water-gas shift reaction: Methane suppression

Cited by 65 publications

References 45 publications

One‐step thermal processing of BaCe₀_.₈Y₀_.₂O₃_−δ hydrogen permeable multichannel hollow fiber membrane

One‐step thermal processing of BaCe₀_.₈Y₀_.₂O₃_−δ hydrogen permeable multichannel hollow fiber membrane

Hydrogen Production from Sorption-Enhanced Steam Reforming of Phenol over a Ni–Ca–Al–O Bifunctional Catalyst

Microstructural Investigation and On-Site Repair of Thin Pd-Ag Alloy Membranes

Contact Info

Product

Resources

About

Catalytic Pd0.77Ag0.23 alloy membrane reactor for high temperature water-gas shift reaction: Methane suppression

Cited by 65 publications

References 45 publications

One‐step thermal processing of BaCe0.8Y0.2O3−δ hydrogen permeable multichannel hollow fiber membrane

One‐step thermal processing of BaCe0.8Y0.2O3−δ hydrogen permeable multichannel hollow fiber membrane

Hydrogen Production from Sorption-Enhanced Steam Reforming of Phenol over a Ni–Ca–Al–O Bifunctional Catalyst

Microstructural Investigation and On-Site Repair of Thin Pd-Ag Alloy Membranes

Contact Info

Product

Resources

About

One‐step thermal processing of BaCe₀_.₈Y₀_.₂O₃_−δ hydrogen permeable multichannel hollow fiber membrane

One‐step thermal processing of BaCe₀_.₈Y₀_.₂O₃_−δ hydrogen permeable multichannel hollow fiber membrane