The Effect of Hydrophobic Modification of Zeolites on CO2 Absorption Enhancement

Lu, Sumin; Ma, Youguang; Zhu, Chunying; Shen, Shuhua; He, Qing

doi:10.1016/s1004-9541(09)60029-x

Cited by 18 publications

(9 citation statements)

References 19 publications

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“…Determination of this method is quite effective because alkaline activation using NaOH activator will make the material more polar. The absorption (adsorption) increases due to the loss of impurities and silica dissolution (Jozefaciuk and Bowanko, 2002;Lu et al, 2009). A significant decrease in resistivity indicates that vitric tuff has the opportunity to be developed as a raw material for Ground Enhancement Material (GEM) through further treatment or formulation with additives that have specific properties.…”

Section: Effect Of Treatment (Chemical-physical Activation)mentioning

confidence: 99%

“…Factors that affect soil resistivity include moisture content, with optimal decline occurring at concentrations above 30% and generally influenced by materials with high adsorption power (Azmi et al, 2019;Bakar et al, 2020;IEEE Standards Association, 2012;Martin et al, 2019;Wan Ahmad et al, 2018). To make the material more porous, increase the adsorption power, including thermal, hydrothermal, and solution treatment (Jozefaciuk and Bowanko, 2002;Kurniasari et al, 2011;Lu et al, 2009;Martin et al, 2019). The resistivity is influenced more by sodium chloride (NaCl) rather than sodium thiosulfate (Na 2 S 2 O 3 ).…”

Section: Introductionmentioning

confidence: 99%

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Time Defendability of Ground Resistance Properties and Its Application of Vitric Tuff on the Development of Ground Enhancement Material

Jakah

Muslim

Mursito³

et al. 2021

Ris.Geo.Tam

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Ground repair material is an essential part of the grounding system as a lightning rod to reduce the risk of lightning activity. Grounding repair materials consist of conductive and superconductive materials, commonly known as Ground Enhancement Materials (GEM). GEM has a low resistivity, very effectively supporting lightning shock energy to earth. Vitric tuff, a pyroclastic rock, is composed of an aluminosilicate (phyllosilicate) mineral group developed as a grounding improvement material. The primary purpose of this study was to determine the decrease in resistivity of vitric tuff in its development as a GEM. The research method consisted of field observations and laboratory experiments (treatment with chemical-physical activation and formulation with additives). The results showed that moisture content, SiO2/Al2O3 ratio (quartz and feldspar mineral/albite), clay mineral, crystal quality (impurities), carbon, and salt were influenced by vitric tuff resistivity. With the vitric tuff formulation and additives, the resistivity reduction is above 99%. Based on experiments, the best formulation of GEM made from tuff is 65% activated vitric tuff, 27% activated charcoal, 6% NaCl, and 2% Cement Material Cellulose. The formula produces a resistivity value of 0.0124 Ω-m, which is stable with time and meets GEM requirements (ρ ≤ 0.20 Ω-m).

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Section: Effect Of Treatment (Chemical-physical Activation)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Time Defendability of Ground Resistance Properties and Its Application of Vitric Tuff on the Development of Ground Enhancement Material

Jakah

Muslim

Mursito³

et al. 2021

Ris.Geo.Tam

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“…Raw zeolite was treated with steam at 550°C in a fixed-bed reactor to dealuminate from the structural skeleton and then the aluminum residues in the micropores were dissolved with HCl. Thus, the silica-alumina ratio in the skeleton was changed, and hence the hydrophilicity of zeolites (Lu et al, 2009, Chen, 1976, Takeuchi et al, 2007, Cheng and Reinhard, 2006.…”

Section: Modification Of Zeolitementioning

confidence: 99%

“…However, studies of the application of hydrophobic zeolite on gas absorption enhancement are seldom found in the literature. In the work of Lu et al (2009), hydrophobic modification of zeolite was carried out by framework element modification and a good hydrophobicity was obtained. In this paper, further research on the effect of zeolites, before and after modification, on CO 2 absorption in three kinds of solvents (water, cyclohexane and soybean oil) was performed.…”

Section: Introductionmentioning

confidence: 99%

The effect of dydrophobic modification of zelites on CO2 absorption in different solvents

Shen

et al. 2010

Braz. J. Chem. Eng.

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The hydrophobicity of zeolite was achieved by a method of hydrothermal synthesis combined with acid treatment for the enhancement of CO2 absorption. The influence of zeolite before and after modification on the absorption of CO2 in three kinds of solvents (water, cyclohexane and soy bean oil) was investigated and many different effects were observed. In aqueous solution, modified zeolite showed a very remarkable enhancement with a maximum enhancement factor of 2.2 for a ratio of SiO2 and Al2O3 equal to 86. However, no measurable enhancement effect was found in cyclohexane solution by adding modified zeolite, although unmodified zeolite showed a weak increase in the absorption rate. In soybean oil, almost no change in CO2 absorption was obtained for both unmodified and modified zeolites. These results indicate that the particles with an enhancement effect for CO2 absorption rate need to have two properties, hydrophobicity and a high adsorption capacity for the solute. For predicting the enhancement factor of CO2 absorption by solid particles, a three-dimensional heterogeneous microcosmic mass transfer model was developed, in which the influence of several parameters and the interaction between particles were mainly considered. The results predicted by the present model show good conformity to experimental data, indicating that the model is rational and applicable for the enhancement process of CO2 absorption by modified zeolite particles

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“…Commonly, natural zeolite has had a relatively low Si/Al ratio, between 5.14 and 6.65 (Yu et al 2009). However, chemical activation using low a concentration of strong acid is still needed to remove impurities in natural zeolite (Lu et al 2009).…”

Section: Introductionmentioning

confidence: 99%

Problem Solving of Isopropyl Alcohol – Water Azeotropic Characteristics Using Packed (Natural Zeolite) Bed Adsorber

Prasakti

Hartono

Jati³

et al. 2020

AJSTD

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The adsorption kinetics of water from an azeotropic mixture of isopropyl alcohol and water using chemically activated natural zeolites with and without a binder (starch) was investigated. In addition, an investigation of the compressive strength of zeolite pellets was conducted to ascertain the performance of the adsorbent for long-term operation. Three parameters were applied in the zeolite-making process: the particle size of zeolite (20, 30, 50, and 80 mesh), the sintering temperature (550, 750, and 1,000°C), the compaction pressure (2, 4, and 6 tonnes), and the starch-to-zeolite weight ratio (0, 1:3, 1:5, and 1:7). Initial screenings indicated that the strongest zeolite pellet was 80-mesh zeolite powder (without starch addition) that was compacted using 6 tonnes pressure and was sintered at 750°C. The adsorption tests using the strongest zeolite were conducted in a packed-bed column for three cycles, followed by compressive strength tests on the zeolite pellets after each cycle. According to the experimental data, zeolite pellets made without the addition of starch could adsorb up to 98.4% of the initial water in the mixture. From the four models proposed to describe the kinetics of adsorption of water from the mixture, the Freundlich model turned out to be the best model.

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The Effect of Hydrophobic Modification of Zeolites on CO2 Absorption Enhancement

Cited by 18 publications

References 19 publications

Time Defendability of Ground Resistance Properties and Its Application of Vitric Tuff on the Development of Ground Enhancement Material

Time Defendability of Ground Resistance Properties and Its Application of Vitric Tuff on the Development of Ground Enhancement Material

The effect of dydrophobic modification of zelites on CO2 absorption in different solvents

Problem Solving of Isopropyl Alcohol – Water Azeotropic Characteristics Using Packed (Natural Zeolite) Bed Adsorber

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