Controlled template removal from nanocast La0.8Sr0.2FeO3 for enhanced CO2 conversion by reverse water gas shift chemical looping

2021 ◽  
pp. 101845
Author(s):  
Ayeong Jo ◽  
Yikyeom Kim ◽  
Hyun Suk Lim ◽  
Minbeom Lee ◽  
Dohyung Kang ◽  
...  
Keyword(s):  
Water Gas Shift ◽  
Chemical Looping ◽  
Co2 Conversion ◽  
Template Removal ◽  
Reverse Water Gas Shift ◽  
Water Gas

scholarly journals Fast oxygen ion migration in Cu–In–oxide bulk and its utilization for effective CO2 conversion at lower temperature

2021 ◽  
Author(s):  
Jun-Ichiro Makiura ◽  
Takuma Higo ◽  
Yutaro Kurosawa ◽  
Kota Murakami ◽  
Shuhei Ogo ◽  
...  
Keyword(s):  
Low Temperature ◽  
Water Gas Shift ◽  
Chemical Looping ◽  
Co2 Conversion ◽  
Ion Migration ◽  
Oxygen Ion ◽  
Reverse Water Gas Shift ◽  
Oxygen Ion Migration ◽  
Lower Temperature ◽  
Water Gas

Efficient activation of CO2 at low temperature was achieved by reverse water–gas shift via chemical looping (RWGS-CL) by virtue of fast oxygen ion migration in a Cu–In structured oxide, even at lower temperatures.

scholarly journals Reverse Water Gas Shift by Chemical Looping with Iron-Substituted Hexaaluminate Catalysts

Catalysts ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 1082 ◽  
Author(s):  
Natalie Utsis ◽  
Miron V. Landau ◽  
Alexander Erenburg ◽  
Moti Herskowitz
Keyword(s):  
Surface Area ◽  
Oxygen Vacancies ◽  
Water Gas Shift ◽  
Chemical Looping ◽  
Direct Connection ◽  
Co2 Conversion ◽  
Reduction Temperature ◽  
Reverse Water Gas Shift ◽  
Rwgs Reaction ◽  
Water Gas

The Fe-substituted Ba-hexaaluminates (BaFeHAl) are active catalysts for reverse water-gas shift (RWGS) reaction conducted in chemical looping mode. Increasing of the degree of substitution of Al3+ for Fe3+ ions in co-precipitated BaHAl from 60% (BaFeHAl) to 100% (BaFe-hexaferrite, BaFeHF), growing its surface area from 5 to 30 m2/g, and promotion with potassium increased the CO capacity in isothermal RWGS-CL runs at 350–450 °C, where the hexaaluminate/hexaferrite structure is stable. Increasing H2-reduction temperature converts BaFeHAl to a thermally stable BaFeHF modification that contains additional Ba-O-Fe bridges in its structure, reinforcing the connection between alternatively stacked spinel blocks. This material displayed the highest CO capacity of 400 µmol/g at isothermal RWGS-CL run conducted at 550 °C due to increased concentration of oxygen vacancies reflected by greater surface Fe2+/Fe3+ ratio detected by XPS. The results demonstrate direct connection between CO capacity measured in RWGS-CL experiments and calculated CO2 conversion.

scholarly journals Reverse Water–Gas Shift Chemical Looping Using a Core–Shell Structured Perovskite Oxygen Carrier

Energies ◽  
2020 ◽  
Vol 13 (20) ◽  
pp. 5324
Author(s):  
Minbeom Lee ◽  
Yikyeom Kim ◽  
Hyun Suk Lim ◽  
Ayeong Jo ◽  
Dohyung Kang ◽  
...  
Keyword(s):  
Metal Oxide ◽  
Oxygen Carrier ◽  
Dark Field ◽  
Water Gas Shift ◽  
Unit Weight ◽  
Core Shell ◽  
Chemical Looping ◽  
Oxygen Carriers ◽  
Reverse Water Gas Shift ◽  
Water Gas

Reverse water–gas shift chemical looping (RWGS-CL) offers a promising means of converting the greenhouse gas of CO2 to CO because of its relatively low operating temperatures and high CO selectivity without any side product. This paper introduces a core–shell structured oxygen carrier for RWGS-CL. The prepared oxygen carrier consists of a metal oxide core and perovskite shell, which was confirmed by inductively coupled plasma mass spectroscopy (ICP-MS), XPS, and high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM) measurements. The perovskite-structured shell of the prepared oxygen carrier facilitates the formation and consumption of oxygen defects in the metal oxide core during H2-CO2 redox looping cycles. As a result, amounts of CO produced per unit weight of the core–shell structured oxygen carriers were higher than that of a simple perovskite oxygen carrier. Of the metal oxide cores tested, CeO2, NiO, Co3O4, and Co3O4-NiO, La0.75Sr0.25FeO3-encapsulated Co3O4-NiO was found to be the most promising oxygen carrier for RWGS-CL, because it was most productive in terms of CO production and exhibited long-term stability.

scholarly journals Fast Oxygen Ion Migration in Cu–In–oxide Bulk and Its Utilization for Effective CO2 Conversion at Lower Temperature

2020 ◽  
Author(s):  
Takuma Higo ◽  
Jun-Ichiro Makiura ◽  
Yutaro Kurosawa ◽  
Kota Murakami ◽  
Shuhei Ogo ◽  
...  
Keyword(s):  
Water Gas Shift ◽  
Chemical Looping ◽  
Key Factors ◽  
Ion Migration ◽  
Oxygen Ion ◽  
Reverse Water Gas Shift ◽  
Oxygen Ion Migration ◽  
Lower Temperature ◽  
Water Gas ◽  
Oxide Ions

Efficient activation of CO<sub>2</sub> at low temperature was achieved by reverse water–gas shift <i>via</i> chemical looping (RWGS‑CL) by virtue of fast oxygen ion migration in Cu–In–structured oxide, even at lower temperatures. Results show that novel Cu–In<sub>2</sub>O<sub>3</sub> structured oxide can show a remarkably higher CO<sub>2</sub> splitting rate than ever reported. Various analyses revealed that RWGS‑CL on Cu–In<sub>2</sub>O<sub>3</sub> is derived from redox between Cu–In<sub>2</sub>O<sub>3</sub> and Cu<i><sub>x</sub></i>In<i><sub>y</sub></i> alloy. Key factors for high CO<sub>2</sub> splitting were fast migration of oxide ions in alloy and the preferential oxidation of the interface of alloy–In<sub>2</sub>O<sub>3</sub> in the bulk of the particles. The findings reported herein can open up new avenues to achieve effective CO<sub>2</sub> conversion at lower temperatures.

scholarly journals CO production from CO 2 via reverse water–gas shift reaction performed in a chemical looping mode: Kinetics on modified iron oxide

2017 ◽  
Vol 17 ◽  
pp. 60-68 ◽  
Author(s):  
Marcus Wenzel ◽  
N.V.R. Aditya Dharanipragada ◽  
Vladimir V. Galvita ◽  
Hilde Poelman ◽  
Guy B. Marin ◽  
...  
Keyword(s):  
Iron Oxide ◽  
Water Gas Shift ◽  
Chemical Looping ◽  
Water Gas Shift Reaction ◽  
Reverse Water Gas Shift ◽  
Shift Reaction ◽  
Water Gas

scholarly journals Effect of Pd and Ir as Promoters in the Activity of Ni/CeZrO2 Catalyst for the Reverse Water-Gas Shift Reaction

Catalysts ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 1076
Author(s):  
Lucy Idowu Ajakaiye Jensen ◽  
Sara Blomberg ◽  
Christian Hulteberg
Keyword(s):  
Catalytic Activity ◽  
Water Gas Shift ◽  
Intermediate Step ◽  
Co2 Conversion ◽  
Water Gas Shift Reaction ◽  
Co2 Utilization ◽  
Reverse Water Gas Shift ◽  
Rwgs Reaction ◽  
Shift Reaction ◽  
Water Gas

Catalytic conversion of CO2 to CO using reverse water gas shift (RWGS) reaction is a key intermediate step for many CO2 utilization processes. RWGS followed by well-known synthesis gas conversion may emerge as a potential approach to convert CO2 to valuable chemicals and fuels. Nickel (Ni) based catalysts with ceria-zirconia (Ce-Zr) support can be used to tune the metal-support interactions, resulting in a potentially enhanced CO2 hydrogenation rate and elongation of the catalyst lifespan. The thermodynamics of RWGS reaction is favored at high temperature for CO2 conversion. In this paper the effect of Palladium (Pd) and Iridium (Ir) as promoters in the activity of 10 wt%Ni 2 wt%Pd 0.1wt%Ir/CeZrO2 catalyst for the reverse water gas shift reaction was investigated. RWGS was studied for different feed (CO2:H2) ratios. The new active interface between Ni, Pd and Ir particles is proposed to be an important factor in enhancing catalytic activity. 10 wt%Ni 2 wt%Pd 0.1 wt%Ir/CeZrO2 catalyst showed a better activity with CO2 conversion of 52.4% and a CO selectivity of 98% for H2:CO2 (1:1) compared to the activity of 10%Ni/CeZrO2 with CO2 conversion of 49.9% and a CO selectivity of 93%. The catalytic activity for different feed ratios using 10 wt%Ni 2 wt%Pd 0.1 wt%Ir/CeZrO2 were also studied. The use of palladium and iridium boosts the stability and life span of the Ni-based catalysts. This indicates that the catalyst could be used potentially to design RWGS reactors for CO2 utilization units.

Photothermal reverse-water-gas-shift over Au/CeO2 with high yield and selectivity in CO2 conversion

2019 ◽  
Vol 129 ◽  
pp. 105724 ◽  
Author(s):  
Bowen Lu ◽  
Fengjiao Quan ◽  
Zheng Sun ◽  
Falong Jia ◽  
Lizhi Zhang
Keyword(s):  
Water Gas Shift ◽  
High Yield ◽  
Co2 Conversion ◽  
Reverse Water Gas Shift ◽  
Water Gas
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