Hydrotalcite-SBA-15 composite material for efficient carbondioxide capture

Pramod, Chodimella Venkata; Upendar, K.; Varkolu, Mohan; Sarma, D. Srinivasa; Dhar, G. Murali; Prasad, P. S. Sai; Raju, B. David; Rao, K. Srinivasa

doi:10.1016/j.jcou.2015.05.002

Cited by 31 publications

(15 citation statements)

References 45 publications

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“…As expected, the samples HT-SBA15-2 and HT-SBA15-3, containing Mg/Al ratios of 2 and 3 respectively, show surface areas comparable to that of the conventional HT sample, suggesting that the pores of the SBA15 are mainly saturated with HT. This is in agreement with the results reported by Pradmod et al [20] who observed a fall in the average pore volume of HT/SBA15 hybrids containing more than 20% wt. HT due to pore saturation.…”

Section: Morphological Characterisationsupporting

confidence: 94%

“…adsorption [13][14][15][16][17][18] and used as support for high temperature CO 2 adsorption by CaO-based sorbents [19]. Recently, Pramod et al [20] investigated the CO 2 adsorption performance of HT-SBA15 composites at low temperature (343 K). Composites with Mg/Al ratio = 2 and a range of HT contents up to 50% were prepared by co-precipitation in an aqueous suspension of SBA-15.…”

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confidence: 99%

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Hydrotalcite/SBA15 composites for pre-combustion CO2 capture: CO2 adsorption characteristics

Peng

Iruretagoyena

Chadwick

2018

Journal of CO2 Utilization

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Over the last decades there has been widespread concern about the increasing concentration of carbon dioxide in the atmosphere due to anthropogenic activities, with fossil fuel combustion being the main CO 2 source [1]. There is, therefore, strong motivation in developing suitable processes for carbon dioxide capture and storage (CCS). Among a range of technologies suggested for this purpose, gas-solid adsorption appears as one of the most promising strategies for CO 2 capture applications. Unlike liquid sorbents, solid adsorbents can be used over a wide temperature range. Pre-combustion carbon capture is an attractive approach to CCS in which a developing technology is sorption-enhanced H 2 production, which operates between 573 and 773 K [2-4]. Numerous studies have proposed the use of hydrotalcite-like compounds for application as adsorbent materials in sorption-enhanced H 2 production [2-4]. Hydrotalcite-like compounds (HTs), also known as mixed-metal layered hydroxides or layered double hydroxides (LDHs), belong to a large class of anionic and basic clays. Their structure is composed of brucite Mg(OH) 2 layers, where Mg 2+ is octahedrally coordinated by hydroxyl groups. These octahedra share adjacent edges to form sheets or layers. In HTs, some of the Mg 2+ ions are replaced by Al 3+ resulting in positive layers that are balanced by charge-compensating anions (e.g. Cl-, CO32-, SO42-− , CO 3 2− , SO 4 2−) located in the interlayer region, where hydrating water molecules are also accommodated. The general formula of HTs is: where M 2+ , M 3+ and A mcommonly represent Mg 2+ , Al 3+ and CO 3 2respectively. Compared to other adsorbents, HTs are competitive at temperatures between ~473K and ~723 K and ~723 K, exhibiting fast adsorption-desorption kinetics and being positively influenced by the presence of water [2,5]. In addition, they require less energy to be regenerated and show better stability upon cycling than other potential CO 2 adsorbents (e.g. calcium oxides) [3]. However, a major drawback of HTs for commercial use is their relatively low CO 2 adsorption capacities. In order to alleviate this weakness and to improve their overall adsorption performance, many studies have focused on modifying the chemistry of HTs by exchanging their structural ions and/or by incorporating alkali dopants [4,6-8]. It has also been reported that the CO 2 performance of HTs can be improved by supporting them with forms of carbon such as nanofibers (CNF) [6], multi-walled nanotubes (MWCNT) [9] and graphene oxide (GO) [10-12]. Although significant enhancement in terms of intrinsic capacity and regenerability have been achieved by the use of these carbon materials, thermal degradation of the support was observed over extended multicycles [10-12]. Composite mixtures of hydrotalcite with a more thermally stable material such as alpha alumina did not result in as marked enhancement of the activity or the stability as the observed with the nanostructured carbon supports [10,11]. Mesoporous silicas have been widely investigated as su...

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Section: Morphological Characterisationsupporting

confidence: 94%

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confidence: 99%

Hydrotalcite/SBA15 composites for pre-combustion CO2 capture: CO2 adsorption characteristics

Peng

Iruretagoyena

Chadwick

2018

Journal of CO2 Utilization

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“…SBA-15 designated hereafter as 'S' was synthesized using a procedure described elsewhere [15,16,17]. The synthesized SBA-15 was used as a support for the preparation of ZrO 2 / SBA-15 catalyst.…”

Section: Catalyst Preparationmentioning

confidence: 99%

Vapor phase esterification of levulinic acid over ZrO2/SBA-15 catalyst

Sankar

Varkolu

Suresh

et al. 2016

Catalysis Communications

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“…Ordered mesoporous silica, SBA-15 was prepared as reported elsewhere. [25][26][27][28] In a typical experiment, 20 g of the triblock copolymer (P 123 , M/s. Aldrich Chemicals, USA) was dispersed in a mixture of 560 g of distilled water and 137.…”

Section: Preparation Of Sba-15mentioning

confidence: 99%

Formic acid assisted hydrogenation of levulinic acid to $$\upgamma $$ γ -valerolactone over ordered mesoporous $$\hbox {Cu/Fe}_{2}\hbox {O}_{3}$$ Cu/Fe 2 O 3 catalyst prepared by hard template method

et al. 2018

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Vapor phase hydrogenation of levulinic acid using formic acid as a hydrogen source has been conducted over ordered mesoporous Cu/Fe 2 O 3 catalysts prepared by hard template method using mesoporous silica, SBA-15. X-ray diffraction result reveals the absence of copper peaks because of either highly dispersed state, or formation of a solid solution with iron oxides. The N 2 sorption analysis and TEM results indicate the retainment of mesoporous nature in the samples. Among the catalysts tested, 10 (wt%) Cu/Fe 2 O 3 seems to be an efficient catalyst to yield higher amounts of γ-valerolactone under hydrogen-free conditions. The results reveal the formation of spinel species, which gets reduced easily at a lower temperature (as evidenced from TPR studies), and as a consequence of this synergism, significant improvement in the catalytic performance for the synthesis of γ-valerolactone from levulinic acid and formic acid in presence of water has been achieved. The presence of water plays a crucial role in obtaining a higher yield of γ-valerolactone. This makes the catalytic system a viable methodology for hydrogenation of levulinic acid to get γ-valerolactone.

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Hydrotalcite-SBA-15 composite material for efficient carbondioxide capture

Cited by 31 publications

References 45 publications

Hydrotalcite/SBA15 composites for pre-combustion CO2 capture: CO2 adsorption characteristics

Hydrotalcite/SBA15 composites for pre-combustion CO2 capture: CO2 adsorption characteristics

Vapor phase esterification of levulinic acid over ZrO2/SBA-15 catalyst

Formic acid assisted hydrogenation of levulinic acid to $$\upgamma $$ γ -valerolactone over ordered mesoporous $$\hbox {Cu/Fe}_{2}\hbox {O}_{3}$$ Cu/Fe 2 O 3 catalyst prepared by hard template method

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