Activated carbon, silica-gel and calcium chloride composite adsorbents for energy efficient solar adsorption cooling and dehumidification systems

2012 ◽  
Vol 35 (6) ◽  
pp. 1626-1638 ◽  
Author(s):  
C.Y. Tso ◽  
Christopher Y.H. Chao
Keyword(s):  
Activated Carbon ◽  
Calcium Chloride ◽  
Silica Gel ◽  
Energy Efficient ◽  
Composite Adsorbents

Development of Composite Adsorbents of Activated Carbon and Hydrophobic Silica Gel for Gasoline Vapor Adsorption

2011 ◽  
Vol 396-398 ◽  
pp. 512-515 ◽  
Author(s):  
Wei Qiu Huang ◽  
Zhi Lun Hu ◽  
Juan Bai
Keyword(s):  
Activated Carbon ◽  
Adsorption Capacity ◽  
Silica Gel ◽  
Lower Layer ◽  
Optimum Ratio ◽  
High Concentration ◽  
Composite Adsorbent ◽  
Low Concentration ◽  
Hydrophobic Silica ◽  
Composite Adsorbents

A composite adsorbent with upper-layer activated carbon (TY) and lower-layer hydrophobic silica gel (HSG) was developed, based on the comprehensive consideration of both adsorption capacity and adsorption heat of activated carbon and hydrophobic silica. For the composite adsorbent, various volumetric ratio of activated carbon to silica gel was designed, and the adsorption capacity and heat effect of the composite adsorbent with different ratio were investigated. The experimental results showed that the optimum ratio was 1:1. Thus, the vapor with high concentration was early adsorbed by the lower-layer hydrophobic silica gel, and then the residual vapor with low concentration was late adsorbed by the upper-layer activated carbon. In this way, incombustibility of silica gel and high adsorption capacity of activated carbon were fully utilized; accordingly the adsorption operation safety was improved and the adsorption capacity of activated carbon was increased owing to that the activated carbon was only used to adsorb the vapor with low concentration.

Structure and Properties of Composite Adsorbents Salt Inside Porous Matrix

2021 ◽  
pp. 43-87
Keyword(s):  
Silica Gel ◽  
Sol Gel ◽  
Salt Content ◽  
Porous Matrix ◽  
Sodium Sulphate ◽  
Crystalline Hydrate ◽  
Host Matrix ◽  
Gel Method ◽  
Composite Adsorbents ◽  
Silicon Oxygen

The chapter is devoted to structure and properties of composite adsorbents ‘salt inside porous matrix'. Characteristics of adsorbents ‘salt inside porous matrix', such as ‘zeolite – crystalline hydrate', ‘vermiculite – crystalline hydrate', ‘silica gel – crystalline hydrate' were analysed. Main advantages of composite adsorbents are shown to be higher adsorptive capacity and lower regeneration temperature as compared with host matrix. Adsorptive capacities of composite materials are shown to be significantly enhanced by introduction of salts in host matrix such as zeolite, vermiculite, or silica gel. Water uptake by composite adsorbent is shown to be increased by rising the salt content in it. The drawback of most of existing impregnation technologies is shown to be impossibility of obtaining composite with salt content more than 40 – 60% along with complexity. Sol gel method is shown to be an alternative for conventional impregnation methods. Properties of adsorbents ‘silica gel – sodium sulphate' synthesized according to sol gel method developed by authors were considered. The composite ‘silica gel – sodium sulphate' composition and structure were studied by IR-spectroscopy and wide-angle x-ray scattering. Adsorptive properties of crystalline Na2SO4 when allocated in silicon oxygen matrix are shown to result from dispersion up to nanoscale. Adsorptive capacities and heat of adsorption of composites ‘silica gel – sodium sulphate' and ‘silica gel – sodium acetate' surpass almost by 30% the value calculated from the linear superposition of the sorption capacities of the sorbent and massive salt. Their adsorption properties are shown to be not a linear combination of properties of silica gel and salt. The formation of a unique structure promoting an increase in the rate of reaction between crystalline hydrates and water vapor in the developed pores of the silicon-oxygen matrix is confirmed. It leads to increasing the heat of adsorption and the heat energy storage density. Strong difference of water sorption kinetic curves of composite ‘silica gel – sodium sulphate' and massive sodium sulphate is revealed. The correlation of their composition, structure, water adsorption kinetic, and operating characteristic as heat storage material is stated.

Chitosan, alginate and other macromolecules as activated carbon immobilizing agents: A review on composite adsorbents for the removal of water contaminants

2020 ◽  
Vol 164 ◽  
pp. 2535-2549 ◽  
Author(s):  
Heloise Beatriz Quesada ◽  
Thiago Peixoto de Araújo ◽  
Daniel Tait Vareschini ◽  
Maria Angélica Simões Dornellas de Barros ◽  
Raquel Guttierres Gomes ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Water Contaminants ◽  
Composite Adsorbents

A method to circumvent the lot number of activated carbon affecting the performance of activated carbon silica gel columns used for cleanup of blood samples for analysis of 29 hazardous organochlorine compounds

The Analyst ◽  
2005 ◽  
Vol 130 (4) ◽  
pp. 557 ◽  
Author(s):  
Kimiyoshi Kitamura ◽  
Yoshikatsu Takazawa ◽  
Shunji Hashimoto ◽  
Jae-Won ChoiPresent address: Organic Chemis ◽  
Hiroyasu Ito ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Silica Gel ◽  
Organochlorine Compounds ◽  
Blood Samples

scholarly journals Energy efficient indoor VOC air cleaning with activated carbon fiber (ACF) filters

2012 ◽  
Vol 47 ◽  
pp. 357-367 ◽  
Author(s):  
Meera A. Sidheswaran ◽  
Hugo Destaillats ◽  
Douglas P. Sullivan ◽  
Sebastian Cohn ◽  
William J. Fisk
Keyword(s):  
Activated Carbon ◽  
Carbon Fiber ◽  
Energy Efficient ◽  
Activated Carbon Fiber ◽  
Air Cleaning
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