Pd-loaded mesoporous silica as a robust adsorbent in adsorption/desorption desulfurization cycles

Rodrigues, A.K.O.; Ramos, J.E.T.; Cavalcante, Célio L.; Rodríguez‐Castellón, Enrique; Azevedo, Diana C. S.

doi:10.1016/j.fuel.2014.02.019

Cited by 26 publications

(15 citation statements)

References 23 publications

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“…Generally, the use of higher temperatures in the adsorption process leads to lower adsorption capacity and lower adsorbate‐adsorbent interaction, as indicated in the b and q max values. This is in agreement with previously reported data for a similar material, suggesting that the adsorption process may be predominantly attributed to the physisorption.…”

Section: Resultssupporting

confidence: 93%

“…Selective adsorption of thiophene‐derivative compounds is an alternative process to remove the last fraction of sulphur in fuels . Several porous solids such as activated carbons, SBA‐15, zeolites, and Al 2 O 3 have been reported as possible materials for this purpose. Incorporation of transition metals in these adsorbents has been employed to further improve their sulphur adsorption properties.…”

Section: Introductionmentioning

confidence: 99%

“…Rodrigues et al studied the desulphurization of benzothiophene solution by π‐complexation on SBA‐15 impregnated with PdCl 2 solution. The adsorption experiments were carried out in a fixed bed system and the authors observed that the adsorption capacity decreased with increasing temperature, demonstrating that the main adsorption mechanism was physisorption.…”

Section: Introductionmentioning

confidence: 99%

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Benzothiophene adsorption on M/SBA‐15 and M/SBA‐15/NH₄F modified (M = Fe or Co) in liquid phase batch system

et al. 2017

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In this study the removal of benzothiophene (BT) from a synthetic solution with n‐octane was evaluated using batch adsorption on modified mesoporous silicas impregnated with iron and cobalt species. The silica was modified to limit the aggregation and enlargement of mesochannels and produce a less ordered structure if compared to SBA‐15. The synthesized adsorbents were characterized by X‐ray diffraction (XRD), N2 adsorption/desorption isotherms at −196 °C, transmission electron microscopy (TEM), and X‐ray photoelectron spectroscopy (XPS). Adsorption equilibrium was investigated using different sulphur concentrations (3–15 mmol/L) and temperatures (30–50 °C). Under optimized conditions, the SBA‐15 sample modified with NH4F containing 10 g/g of Co showed the highest adsorption capacity (0.101 mmol/g), at 30 °C. Thus it may be inferred that these materials are promising for removal of sulphur in low concentrations from liquid fuels.

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Section: Resultssupporting

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Benzothiophene adsorption on M/SBA‐15 and M/SBA‐15/NH₄F modified (M = Fe or Co) in liquid phase batch system

et al. 2017

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“…The stability of the MWCNT adsorbent was superior to that of unsupported HT. However, it was evident that the HT-SBA15 supported hybrids were markedly more stable than the HT-MWCNT hybrid, which is possibly attributed to the large pores and thick walls of the SBA15 making it very hydrothermally stable [25]. In previous studies, we have shown that although the multicycle stability of the CO 2 adsorption capacity of HT/MWCNTs and HT/GO is improved compared to the pure HT, both materials exhibit a gradual loss of weight over cycling probably due to the evolution of residual functional groups present in the MWCNTs and GO [9,12].…”

Section: Adsorption-desorption Thermal Cyclingmentioning

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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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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“…However, it is a huge challenge to keep these small nanoparticles from agglomerating during catalytic reaction and to separate them from the reaction system for reuse, because of their high surface energy and small size. Great efforts have been made to overcome these problems by immobilizing the nanoparticles on solid supports such as graphite carbon, metal oxide, polymers, zeolites, and nanocomposites . In particular, immobilizing the nanocatalysts on magnetic core–shell nanocomposites makes the recycle of the catalysts from the reaction system easy and efficient by means of facile magnetic separation .…”

Section: Introductionmentioning

confidence: 99%

Nitrogen‐Enriched Fe₃O₄@Carbon Nanospheres Derived from Fe₃O₄@3‐Aminophenol/Formaldehyde Resin Nanospheres Based on a Facile Hydrothermal Strategy: Towards a Robust Catalyst Scaffold for Platinum Nanocrystals

Tian

Guo

Zhao

et al. 2015

Chemistry An Asian Journal

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Robust nitrogen-enriched Fe3O4@carbon nanospheres have been fabricated as a catalyst scaffold for Pt nanoparticles. In this work, core-shell Fe3O4@3-aminophenol/formaldehyde (APF) nanocomposites were first synthesized by a simple hydrothermal method, and subsequently carbonized to Fe3O4@N-Carbon nanospheres for in situ growth of Pt nanocrystals. Abundant amine groups were distributed uniformly onto Fe3O4@N-Carbon nanospheres, which not only improved the dispersity and stability of the Pt nanocrystals, but also endowed the Pt-based catalysts with good compatibility in organic solvents. The dense three-dimensional cross-linked carbon shell protects the Fe3O4 cores against damage from harsh chemical environments, even in aqueous HCl (up to 1.0 M) or NaOH (up to 1.0 M) solutions under ultrasonication for 24 hours, which indicates that it can be used as a robust catalyst scaffold. In the reduction of nitrobenzene compounds, the Fe3O4@N-Carbon@Pt nanocatalysts show outstanding catalytic activity, stability, and recoverability.

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Pd-loaded mesoporous silica as a robust adsorbent in adsorption/desorption desulfurization cycles

Cited by 26 publications

References 23 publications

Benzothiophene adsorption on M/SBA‐15 and M/SBA‐15/NH₄F modified (M = Fe or Co) in liquid phase batch system

Benzothiophene adsorption on M/SBA‐15 and M/SBA‐15/NH₄F modified (M = Fe or Co) in liquid phase batch system

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

Nitrogen‐Enriched Fe₃O₄@Carbon Nanospheres Derived from Fe₃O₄@3‐Aminophenol/Formaldehyde Resin Nanospheres Based on a Facile Hydrothermal Strategy: Towards a Robust Catalyst Scaffold for Platinum Nanocrystals

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Pd-loaded mesoporous silica as a robust adsorbent in adsorption/desorption desulfurization cycles

Cited by 26 publications

References 23 publications

Benzothiophene adsorption on M/SBA‐15 and M/SBA‐15/NH4F modified (M = Fe or Co) in liquid phase batch system

Benzothiophene adsorption on M/SBA‐15 and M/SBA‐15/NH4F modified (M = Fe or Co) in liquid phase batch system

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

Nitrogen‐Enriched Fe3O4@Carbon Nanospheres Derived from Fe3O4@3‐Aminophenol/Formaldehyde Resin Nanospheres Based on a Facile Hydrothermal Strategy: Towards a Robust Catalyst Scaffold for Platinum Nanocrystals

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Benzothiophene adsorption on M/SBA‐15 and M/SBA‐15/NH₄F modified (M = Fe or Co) in liquid phase batch system

Benzothiophene adsorption on M/SBA‐15 and M/SBA‐15/NH₄F modified (M = Fe or Co) in liquid phase batch system

Nitrogen‐Enriched Fe₃O₄@Carbon Nanospheres Derived from Fe₃O₄@3‐Aminophenol/Formaldehyde Resin Nanospheres Based on a Facile Hydrothermal Strategy: Towards a Robust Catalyst Scaffold for Platinum Nanocrystals