Hierarchically porous aluminosilicates as the water vapor adsorbents for dehumidification

Wei, Xiaolan; Wang, Weilong; Xiao, Jing; Zhang, Li; Chen, Hongyin; Ding, Jing

doi:10.1016/j.cej.2013.05.062

Cited by 70 publications

(29 citation statements)

References 27 publications

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“…This indicated that water is more strongly bonded to these materials with Al and Si than to that with Si only. This enhancement in water bonding strength by addition of aluminum into silica was also observed by other researchers 41,42 .…”

Section: Water Desorption Resultssupporting

confidence: 86%

Importance of the Order of Addition of the Alumina Precursor and its Type Into Al-SBA-15 Mesoporous Materials for Use as Water Adsorbents

Ribeiro

Vasconcelos

2018

Mat. Res.

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In the present report, Al-SBA mesoporous materials were investigated for use as water adsorbents. Different precursors for aluminum were investigated: aluminum sulfate and nitrate, boehmite, and aluminum tri-sec-butoxide. Furthermore, three different procedures for addition of the silica and alumina sources were tested. Samples were characterized by nitrogen adsorption to observe their textural characteristics and by thermogravimetric desorption of water to address their performance. The sample synthesized with aluminum tri-sec-butoxide as aluminum precursor and a pre-hydrolysis step of the silica source presented the highest adsorption capacity: 1057 g.kg -1 . It was also observed that water attaches more strongly to Al-containing samples than to pure silica, and that water adsorption capacity is more related to the pore volume of samples than to their surface area. This work has shown that functionalizing SBA-15 materials with aluminum is a promising strategy for producing water adsorbents with improved performance and potential for many applications.

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Section: Water Desorption Resultssupporting

confidence: 86%

Importance of the Order of Addition of the Alumina Precursor and its Type Into Al-SBA-15 Mesoporous Materials for Use as Water Adsorbents

Ribeiro

Vasconcelos

2018

Mat. Res.

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“…The most important principles for the selection of adsorption materials are large amounts of cyclic adsorption and lower regeneration temperatures. Commonly used adsorbents are silica gel (Liu et al., 2017), molecular sieve (Wei et al., 2013) and activated carbon (Tso and Chao, 2012). In general, silica gel is utilized diffusely in thermal energy storage (Yu et al., 2014), extraction of water from air (Bar, 2004; Wang et al., 2017), adsorption heat transformation (Gordeeva et al., 2013) and solid desiccant cooling systems (Wang et al., 2009; Zheng et al., 2014).…”

Section: Introductionmentioning

confidence: 99%

Effect of carbonization temperature on characterization and water vapor adsorption of coffee-shell activated carbon

Sun

et al. 2020

Adsorption Science & Technology

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Coffee shells, which are abundant in cellulose and lignin, are good raw materials to prepare activated carbon. In this paper, coffee shells were selected as raw materials for activated carbon preparation by KOH chemical activation. Influence of carbonization temperature on adsorption capacity of water vapor over activated carbon was researched. Thermogravimetric analysis was employed to select the scope of carbonization temperature. Activation energies of coffee shells pyrolyzed at different heating rates were calculated. Nitrogen adsorption/desorption isotherm and scanning electron microscopy (SEM) were adopted to characterize the activated carbon. And water vapor adsorption isotherms were simulated by the finite simplification model of Do-Do adsorption model. The results show that activation energies of coffee shells pyrolysis process with heating rates of 5, 10 and 20 K/min are 17.21, 18.01 and 57.52 kJ/mol, respectively. The optimal carbonization temperature of coffee shells is 923 K. The adsorption amount of water vapor can reach about 702.3 mg/g under experiment temperature of 298 K and relative humidity of 70%. The highest total pore volume and Brunauer–Emmett–Teller (BET) specific surface area are 1.41 cm3/g and 2817 m2/g, respectively. The simulation results of the finite simplification model are consistent well with water vapor adsorption experiment results. The results show that activated carbon prepared at the optimal condition would be the potential candidate for solar drying system.

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“…It is also noticed that the intensity of such band is strengthened by the addition of Al into the laponite clay structure . The characteristic bands near 480 cm −1 and 890 cm −1 represent the stretching vibration of M−O‐Si and Al‐O−Si group, respectively . The band position at 480 cm −1 was slightly shifted towards 500 cm −1 by the addition of Pd and Fe possibly due to the existence of a strong interaction between those metals and Al‐pillared laponite clay.…”

Section: Resultsmentioning

confidence: 88%

Fe‐Pd‐Immobilized Al‐Pillared Laponite Clay as an Efficient Catalyst for the Conversion of Furfural into Tetrahydrofurfuryl Alcohol

et al. 2020

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Furfural has been widely reported as a new-generation renewable source for the production of chemicals and fuels. In this study, FeÀ Pd immobilized Al-pillared laponite clay material with suitable catalytic properties was explored as an efficient catalyst for the direct conversion of furfural (FAL) into tetrahydrofurfuryl alcohol (THFOL) under the mild reaction conditions (H 2 pressure-10 bar, temperature-60°C and time-4 hrs). The synthesized samples were characterized by several physico-chemical techniques. XRD, FT-IR, H 2-TPR and ICP-OES results revealed the successful loading of those bi-metals into the Al-pillared laponite structure. Acidity of the sample has been thoroughly investigated by NH 3-TPD and FT-IR techniques. The catalytic activity of synthesized samples was thoroughly evaluated for the total hydrogenation of FAL for the production of THFOL. It was observed that pure FeÀ Pd catalyst showed very low FAL conversion (∼ 53 %) and THFOL selectivity (∼ 38 %), whereas the Al-pillared laponite clay supported FeÀ Pd catalyst showed an increase in the FAL conversion and THFOL selectivity up to 95 % and 98 %, respectively. The high performance of FeÀ Pd/Al-pillared laponite catalyst towards the formation of THFOL is not only ascribed to the fine dispersion of Fe and Pd species and their synergistic effect but also due to the high surface area, mesoporosity and suitable acidity of Al-pillared laponite. The recyclability of the catalyst was also explored thoroughly which confirmed their stability. Sustainability of this process lies in the utilization of low-value bio-derived FAL for the production of industrially important THFOL chemical.

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Hierarchically porous aluminosilicates as the water vapor adsorbents for dehumidification

Cited by 70 publications

References 27 publications

Importance of the Order of Addition of the Alumina Precursor and its Type Into Al-SBA-15 Mesoporous Materials for Use as Water Adsorbents

Importance of the Order of Addition of the Alumina Precursor and its Type Into Al-SBA-15 Mesoporous Materials for Use as Water Adsorbents

Effect of carbonization temperature on characterization and water vapor adsorption of coffee-shell activated carbon

Fe‐Pd‐Immobilized Al‐Pillared Laponite Clay as an Efficient Catalyst for the Conversion of Furfural into Tetrahydrofurfuryl Alcohol

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