Breakthrough analysis for CO2 removal by activated hydrotalcite and soda ash

Fıçıcılar, Berker; Doğu, Timur

doi:10.1016/j.cattod.2006.02.058

Cited by 65 publications

(46 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Hydrotalcites have been reported to be ill influenced by the presence of steam (Ding and Alpay 2000;Ficicilar and Dogu 2006). The effect of steam which enhances the kinetics of carbonation of Ca-based sorbents is a known but poorly quantified phenomenon, and is generally attributed to the increased CO 2 3 ions transport in a steam environment.…”

Section: Introductionmentioning

confidence: 99%

Dolomite study forin situCO₂capture for chemical looping reforming

Pimenidou

Dupont

2013

International Journal of Ambient Energy

View full text Add to dashboard Cite

The non-isothermal kinetic and thermal behaviour of a naturally formed dolomite in conditions that approach in situ CO2 capture in chemical looping reforming, were investigated. The performance of this dolomite was studied at micro-scale in 'dry' conditions, as well as at macro-scale in 'dry' and 'wet' conditions to investigate the effects of scale (3 mg, 2.5 g), partial pressures of CO 2 (< 15 kPa) and steam, and deactivation upon limited cycling. The carbonation and calcination kinetics were modelled using an improved iterative Coats-Redfern method. Increasing CO 2 partial pressures on the 'dry' macroscale exacerbated the experimental carbonation conversions in an inversely proportional trend when compared with those at micro-scale. The presence of steam had a positive effect on CO 2 chemisorption. Steam had a negligible influence on the calcination activation energies. The activation energies of carbonation were increased for the experiments at the highest CO 2 partial pressures under wet conditions.

show abstract

Section: Introductionmentioning

confidence: 99%

Dolomite study forin situCO₂capture for chemical looping reforming

Pimenidou

Dupont

2013

International Journal of Ambient Energy

View full text Add to dashboard Cite

show abstract

“…However, the effect of water vapour on the CO 2 capture capacity of hydrotalcites is still not clear. According to some authors [47,48], the presence of water vapour has a negligible effect on the CO 2 capture capacity, whereas others [49][50][51] have reported that small amounts of water vapour significantly enhance it. The positive effect of water vapour on the CO 2 capture capacity of hydrotalcites could be due to several reasons.…”

Section: Sorbent Enhanced Reactormentioning

confidence: 99%

“…Ficicilar et al [48] observed that the presence of steam decreases the sorption rate of CO 2 due to an increase of the diffusion resistance. Secondly, the amount of CO 2 adsorbed depends not only on the hydrotalcite properties but also on the CO 2 partial pressure along the reactor.…”

Section: Sorbent Enhanced Reactormentioning

confidence: 99%

“…Nevertheless, C deposition could be avoided by either increasing the H 2 O/CO ratio in the feed mixture, modifying the acid-base surface properties of hydrotalcite or by using a highly selective catalyst. According to the thermodynamic calculations performed by E. Xue et al [40], the catalyst deactivation multicomponent systems] has been studied by several authors [47][48][49][50][51]. However, the effect of water vapour on the CO 2 capture capacity of hydrotalcites is still not clear.…”

Section: Sorbent Enhanced Reactormentioning

confidence: 99%

“…Although hydrotalcites are able to capture about 1.9-5.2 wt% of CO 2 in a temperature range between 200 and 400ºC [47,48,59], the percentage of CO 2 adsorbed did not reach 100% in the full temperature range studied. According to M. Leon et al [31], the CO 2 adsorption capacities of the hydrotalcite employed in this work is 0.84 mmol/g at 100ºC.…”

Section: Sorbent Enhanced Reactormentioning

confidence: 99%

See 2 more Smart Citations

Studies on water–gas-shift enhanced by adsorption and membrane permeation

et al. 2014

View full text Add to dashboard Cite

A new sorption enhanced membrane reactor (SEMR), consisting of a packed adsorbentcatalyst bed (10% CuO/CeO 2 catalyst and a hydrotalcite-derived Mg-Al mixed oxide) around a tubular Pd/Ag hollow fibre membrane, has been proposed to obtain high purity H 2 and simultaneous capture of CO 2 during the water gas shift reaction. The H 2 yield at 350ºC using the SER was 80%, which is 33% higher than that obtained in the traditional FBR and 18% higher than the corresponding thermodynamic equilibrium.However, due to the high CO/H 2 O ratio (R > 1), undesirable side-reactions such as C deposition become important at temperatures higher than 400ºC. A similar behaviour was observed using the SEMR, however in this case, a high purity CO x free H 2 production was obtained. This preliminary study shows relevant data obtained using a SER and the new SEMR, which allows for the better understanding and design of multifunctional catalytic reactors.

show abstract

The conversion of an organometallic compound into an intercalated thin‐layer amorphous structure

Othman

Fernando

Kim

2009

Applied Organom Chemis

View full text Add to dashboard Cite

A thin alumina-hydrotalcite (Al-HT) film was fabricated from the synthesized boehmite and HT sol samples. The sols were a Newtonian fluid within 12 h of the sol synthesis and pseudo-plastic flow thereon. Co-precipitated HT demonstrated poorly crystallized periclase and spinel structures and apparent doublet peak of hydrotalcite at 2θ = 39-44• , indicative of a disordered structure. The heated Al-HT sample demonstrated highly amorphous structure with single hydrotalcite peak but barely observed γ -alumina and γ -boehmite phases. The exfoliation of the spinel, gibbsite and periclase in the Al-HT was caused by the intercalation of boehmite into the HT layers that impeded the formation of the oxides phases.

show abstract

Breakthrough analysis for CO2 removal by activated hydrotalcite and soda ash

Cited by 65 publications

References 12 publications

Dolomite study forin situCO₂capture for chemical looping reforming

Dolomite study forin situCO₂capture for chemical looping reforming

Studies on water–gas-shift enhanced by adsorption and membrane permeation

The conversion of an organometallic compound into an intercalated thin‐layer amorphous structure

Contact Info

Product

Resources

About

Breakthrough analysis for CO2 removal by activated hydrotalcite and soda ash

Cited by 65 publications

References 12 publications

Dolomite study forin situCO2capture for chemical looping reforming

Dolomite study forin situCO2capture for chemical looping reforming

Studies on water–gas-shift enhanced by adsorption and membrane permeation

The conversion of an organometallic compound into an intercalated thin‐layer amorphous structure

Contact Info

Product

Resources

About

Dolomite study forin situCO₂capture for chemical looping reforming

Dolomite study forin situCO₂capture for chemical looping reforming