CO2 conversion to CO by auto-thermal catalyst-assisted chemical looping

Hu, Jiawei; Buelens, Lukas; Theofanidis, Stavros Alexandros; Galvita, Vladimir; Poelman, Hilde; Marin, Guy

doi:10.1016/j.jcou.2016.05.006

Cited by 61 publications

(32 citation statements)

References 43 publications

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“…In order to tackle this drawback, the upgraded technology of CCAR can provide a prospective solution. The feasibility of the CCAR process over a Ni-Fe/MgAl 2 O 4 bifunctional material was studied through both thermodynamic analysis and prolonged cycling experiments [20]. In the reduction half-cycle, a mixture of CH 4 , CO 2 and O 2 in a 1:1:0.5 molar ratio was first converted over the Ni catalyst into a mixture of CO and H 2 , which both reduce iron oxide to metallic Fe (Figure 14a).…”

Section: Bifunctional Materials For Catalyst-assisted Chemical Loomentioning

confidence: 99%

“…Among the innovating technologies, chemical looping technology has the potential to achieve inherent separation of CO 2 from a fuel feed, thus eliminating energy intensive gas-gas separation costs, expectedly providing highest cost reduction benefits once it is fully commercialized. Furthermore, this technique can also provide an approach to convert CO 2 into value added chemicals and energy sources (syngas, CO) [19,20,21,22,23]. …”

Section: Introductionmentioning

confidence: 99%

“…Additionally, material deactivation due to active metal sintering will be aggravated under high-temperature conditions during dry reforming [31]. To counter these problems, CCDR was adjusted to yield a new process, called catalyst-assisted chemical looping auto-thermal dry reforming (CCAR) [20]. Here, a small amount of O 2 is added to CH 4 and CO 2 to partially convert CH 4 in an exothermic reaction (partial oxidation or combustion) [31,32,33,34,35], so that heat is generated in-situ, thereby compensating the strong endothermicity of the dry reforming reaction.…”

Section: Introductionmentioning

confidence: 99%

“…Here, a small amount of O 2 is added to CH 4 and CO 2 to partially convert CH 4 in an exothermic reaction (partial oxidation or combustion) [31,32,33,34,35], so that heat is generated in-situ, thereby compensating the strong endothermicity of the dry reforming reaction. Based on thermodynamic analysis, the whole CCAR process can run in thermoneutral conditions, i.e., ΔH = 0 kJ∙mol −1 , with molar ratios of CH 4 :CO 2 :O 2 = 1:2.4:0.3 at 600 °C or with molar ratios of CH 4 :CO 2 :O 2 = 1:2:0.5 at 750 °C [20]. Owing to the inherent composition of biogas, typically containing CH 4 (45~75%), CO 2 (25~55%) and O 2 (0.01~5%) [36], the CCAR can efficiently utilize biogas as fuel feed in the reduction half-cycle.…”

Section: Introductionmentioning

confidence: 99%

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Advanced Chemical Looping Materials for CO2 Utilization: A Review

Galvita

Poelman

et al. 2018

Materials

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Combining chemical looping with a traditional fuel conversion process yields a promising technology for low-CO2-emission energy production. Bridged by the cyclic transformation of a looping material (CO2 carrier or oxygen carrier), a chemical looping process is divided into two spatially or temporally separated half-cycles. Firstly, the oxygen carrier material is reduced by fuel, producing power or chemicals. Then, the material is regenerated by an oxidizer. In chemical looping combustion, a separation-ready CO2 stream is produced, which significantly improves the CO2 capture efficiency. In chemical looping reforming, CO2 can be used as an oxidizer, resulting in a novel approach for efficient CO2 utilization through reduction to CO. Recently, the novel process of catalyst-assisted chemical looping was proposed, aiming at maximized CO2 utilization via the achievement of deep reduction of the oxygen carrier in the first half-cycle. It makes use of a bifunctional looping material that combines both catalytic function for efficient fuel conversion and oxygen storage function for redox cycling. For all of these chemical looping technologies, the choice of looping materials is crucial for their industrial application. Therefore, current research is focused on the development of a suitable looping material, which is required to have high redox activity and stability, and good economic and environmental performance. In this review, a series of commonly used metal oxide-based materials are firstly compared as looping material from an industrial-application perspective. The recent advances in the enhancement of the activity and stability of looping materials are discussed. The focus then proceeds to new findings in the development of the bifunctional looping materials employed in the emerging catalyst-assisted chemical looping technology. Among these, the design of core-shell structured Ni-Fe bifunctional nanomaterials shows great potential for catalyst-assisted chemical looping.

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Section: Bifunctional Materials For Catalyst-assisted Chemical Loomentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Advanced Chemical Looping Materials for CO2 Utilization: A Review

Galvita

Poelman

et al. 2018

Materials

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“…Climate scientists attribute climate change overwhelmingly to fossil‐fuel utilization and the associated increase in the atmospheric CO 2 concentration . However, nearly all projections show that fossil‐fuel utilization is increasing at significant rates, driven largely by the increased energy demand caused by economic progress in underdeveloped nations.…”

Section: Introductionmentioning

confidence: 99%

Effect of Operating Conditions on Cryogenic Carbon Dioxide Removal

et al. 2017

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In this investigation, a natural‐gas (NG) treatment system for NG sources with high CO2 content is simulated experimentally and theoretically using Aspen Plus. The concept uses patented heat exchangers and a process design developed as part of the cryogenic carbon capture(CCC) process to remove enough CO2 to enable the treated gas to be handled without the modification of traditional NG equipment. Simultaneously, the process removes liquefied natural gas (LNG) very efficiently. This process provides a simpler alternative to the solvent‐based CO2 removal, absorbent drying, and cryogenic NG liquid extraction systems found in traditional NG processing. The data from an experimental bench‐scale apparatus verify the results of the simulations as a function of NG composition and pressure. Costing parameters, exergy loss, and heat‐exchanger efficiency are also discussed. The results confirm low exergy losses for bench‐scale apparatus. The system uses heat exchangers with efficiencies of more than 90 %. High pressure and low methane content in the NG result in high CO2 capture.

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La‐hexaaluminate for synthesis gas generation by Chemical Looping Partial Oxidation of Methane Using CO₂ as Sole Oxidant

et al. 2017

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in Wiley Online Library (wileyonlinelibrary.com)Chemical looping partial oxidation of methane using a sole CO 2 oxidant (CL-POM-CO 2 ) is an emerging technology for synthesis gas generation and CO 2 utilization, which is highly dependent on an oxygen carrier (OC). In this work, Fe-substituted La-hexaaluminate as the OC was found to exhibit good reactivity and stability during 50 periodic CH 4 / CO 2 redox cycles due to the formation of magnetoplumbite La-hexaaluminate structure with the introduction of La. Deeper reduction for synthesis gas generation did not destroy the La-hexaaluminate structure via a charge compensation mechanism, which increased CH 4 reactivity and further improved CO 2 utilization under subsequent re-oxidation. In the La-hexaaluminate structure, O 6 -Fe 31 (Oh) was highly active for the total oxidation of methane, while O 5 -Fe 31 (Tr) and O 4 -Fe 31 (Th) selectively oxidized CH 4 to synthesis gas. The sole CO 2 oxidant only selectively recovered O 5 -Fe 31 (Tr) and O 4 -Fe 31 (Th), and thus is more favorable for improving synthesis gas selectivity than O 2 /air, which offers an attractive opportunity for CO 2 utilization.

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CO2 conversion to CO by auto-thermal catalyst-assisted chemical looping

Cited by 61 publications

References 43 publications

Advanced Chemical Looping Materials for CO2 Utilization: A Review

Advanced Chemical Looping Materials for CO2 Utilization: A Review

Effect of Operating Conditions on Cryogenic Carbon Dioxide Removal

La‐hexaaluminate for synthesis gas generation by Chemical Looping Partial Oxidation of Methane Using CO₂ as Sole Oxidant

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CO2 conversion to CO by auto-thermal catalyst-assisted chemical looping

Cited by 61 publications

References 43 publications

Advanced Chemical Looping Materials for CO2 Utilization: A Review

Advanced Chemical Looping Materials for CO2 Utilization: A Review

Effect of Operating Conditions on Cryogenic Carbon Dioxide Removal

La‐hexaaluminate for synthesis gas generation by Chemical Looping Partial Oxidation of Methane Using CO2 as Sole Oxidant

Contact Info

Product

Resources

About

La‐hexaaluminate for synthesis gas generation by Chemical Looping Partial Oxidation of Methane Using CO₂ as Sole Oxidant