2 edition of investigation of energy relations at the surface of activated silica gel ... found in the catalog.
investigation of energy relations at the surface of activated silica gel ...
Ernest Grinnell Almy
Written in English
Thesis (PH. D.)--University of Michigan, 1932.
|Statement||by E. Grinnell Almy ...|
|LC Classifications||QC183 .A6 1932|
|The Physical Object|
|Pagination||3 p. l., 31 p.|
|Number of Pages||31|
|LC Control Number||32022728|
Purchase Fundamentals of Adsorption, Volume 80 - 1st Edition. Print Book & E-Book. ISBN , Book Edition: 1. Abstract— This article presents analytical investigation results on the performance of dual-mode multi-bed adsorption cooling systems using silica gel-water pair. This novel adsorption chiller utilizes effectively low-temperature solar or waste heat sources of temperature between 40 and 85°C. TwoFile Size: KB.
title = "Experimental investigation of a silica gel-water adsorption refrigeration cycle - the influence of operating conditions on cooling output and COP", abstract = "This paper is the second part of a study on the use of adsorption refrigeration cycles Cited by: L.T. Zhura6le6:Colloids and Surfaces A:Physicochem. Eng. Aspects () 1–38 3 Fig. 2. Types of silanol groups and siloxane bridges on the surface of amorphous silica, and internal OH groups (see text). Qn-terminology is used in NMR, where n indicates the number of bridging bonds (O Si) tied to the central Si atom: Q4, surface siloxanes; Q3, single silanols; Q2, geminal silanolsFile Size: KB.
silica gel –water vapor isotherm as a linear relation for the full range of silica gel water content () and air relative humidity (%). Anderson et al.  have determined the equilibrium water-uptake properties of silica gel in an atmosphere of pure water vapor. Pesaran. The adsorption characteristics of pure water vapor on to RD type silica gel and n-butane on pitch based activated carbon (type Maxsorb III) at temperatures ranging from to K and at different equilibrium pressures between and kPa have.
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Carbon, zeolites, silica gel and activated alumina). The silica gel (SiO 2O) is amorphous synthetic silica whose pore structure creates, by agglomeration, substantially spherical microparticules of approximately uniform size and between 2 and 20 nm.
This structure is responsable for the very large surface area, typically. The multilayer formation of water on silica gel is discussed, and experiments indicating the existence of three layers of water are described. The interaction of active silica gel with solvent is also considered.
Activated silica gel as used in chromatography appears to Cited by: Silica gel is a incompletely dehydrated polymeric structure of colloidal silicic acid with the formula SiO 2 nH 2 O.
This amorphous material consists of spherical particles 2–20 nm in size, sticking together to form the adsorbent silica gel exhibits an excellent capacity for adsorption of water up to 35–40% of its dry mass at conditions found in chillers and hence, chosen as Cited by: Experimental Investigation Of Silica Gel- Water Adsorption System 86 mathematical models, it shows the use of CaCl2.C.A.
Infante Ferreira, () presents the different technologies that are available to deliver refrigeration from solar energy. Smithy, File Size: KB. During the investigation, it has been found that silica gel has maximum moisture content (dry basis), i.e.
followed by molecular sieve, novel composite, and activated alumina having moisture content, andby: 2. The thermodynamic property surfaces of silica gel + water systems have been developed and described from the rigor of chemical equilibria between adsorbed and gaseous phases, Maxwell relations, the entropy of the adsorbed phase, and experimentally measured adsorption isotherm data.
These property fields compute the entropy, enthalpy, specific heat capacity, and isosteric heat of Cited by: silica gel and sulfur dioxide as an adsorbent/adsorbate pair. Recently the small scale thermal driven development of adsorption refrigeration technology became crucial as it can be driven by solar energy.
This is due to that the sorption refrigeration systems are quiet, long lasting, cheap to maintain and environmentally benign .File Size: KB.
In this article, the regeneration of different desiccants such as silica gel, activated alumina, and activated charcoal by using parabolic dish collector has been proposed. The regeneration performance is greatly affected by the solar radiation, surface temperature of desiccant, but also depends on the initial moisture content in the by: using solar energy in a PDC.
By using PDC silica gel can also be generated. This paper gives the results of regeneration of silica gel by using solar energy with parabolic dish collector Singh and Singh  presented a paper on regeneration of silica gel in multi-shelf regenerator.
In the presented paper an investigation on the regeneration of. Preparation and Use of Activated Silica By A. Griffin A paper presented on Sep. 3,at the West Virginia Section Meet-ing, Morgantown,by A. Griffin, Director, Technical Serv-ice Div., Wallace & Tiernan, Inc., Belleville, NJ.
ACTIVATED silica is unique in l that it belongs to a small group of water works chemicals that must be. material. Kumar et al.7 regenerated the silica gel by using parabolic dish and found that silica gel can be easily regenerated by using solar energy.
Kumar et al.8 experimentally investigated an air conditioning system with various solid and composite desiccant material for the application of heating and humidification. It was found that silica gel. Composite adsorbents were synthesized from activated carbon, silica-gel and CaCl optimized condition for adsorption cooling systems was obtained when raw activated carbon was impregnated by soaking in 10 wt.% sodium silicate solution for 48 h and then in 30 wt.% CaCl 2 solution for 48 h.
A kg kg −1 of difference in equilibrium water uptake between 25 °C and °C was recorded Cited by: Microcalorimetric investigation of water vapor adsorption on silica gel and related carbon–silica gels, prepared by carbonization of CH2Cl2 at a surface of silica gels at °C.
surface area and hence high surface capacity for adsorption. The adsorbents must also have a distinct pore structure which enables fast transport of the gaseous vapors. Most industrial adsorbents fall into one of three classes: Oxygen-containing compounds are typically hydrophilic and polar, including materials such as silica gel and Size: KB.
Nature of Silica Surface Aggregate Strength—Interparticle Bonding Electron micrographs, Partial dissolution method, Mechanical strength of the aggregate Silica Gels Sources of Silica Gel From soluble silicates and minerals, From colloidal silica, From hydrolysis of silicon compounds Factors Controlling Gel Characteristics Fundamentals for the regeneration of silica gel Silica gels have an amorphous, disordered microstructure and thus a broad pore size distribution.1 Because of its polarity silica gels is a hydrophilic adsorbents, which is reflected in the affinity for dipolar molecules, such as water molecules.
Because silica gel based on a physicalFile Size: KB. Wettability of Silicon, Silicon Dioxide, and Organosilicate Glass. Master of Science (Materials Science and Engineering), Decemberpp., 26 tables, 48 illustrations, references 88 titles.
Table Surface Energy for OSG Cited by: 6. Fig. A sketch showing the water mo lecules adsorbed onto silica gel surface (a) and the second derivative profiles of the near infrared spectrum in the water OH combination frequency region II.
EXPERIMENTAL A. Materials, Thermal Treatment and Adsorption Evolution of Water on Silica Gel Surface Two different silica gel samples (Table. Siloxanes are among the most technologically troublesome trace compounds present in biogas.
As a result of their combustion, hard-to-remove sediments are formed, blocking biogas energy processing devices and reducing the efficiency of biogas plants.
The purpose of this study was to help investors and designers to choose the optimal technology for the adsorptive removal of volatile.
Silicon NMR study of the surface of silica gel by cross polarization and magic-angle spinning. Journal of the American Chemical Society(25), DOI: /jaa J. Leffler, J. Zupancic. Decomposition of azocumene on silica by:. ON ADSORPTION OF WATER VAPOR ON SILICA GEL BADANIE ADSORPCJI PARY WODNEJ NA SILIKAŻELU Abstract The aim of this work is to present the results of studies on heat and mass transfer in an adsorber, which is the main part of an adsorption chiller.
The paper refers to adsorption of water vapor on silica gel : Monika Gwadera, Krzysztof Kupiec, Andrzej Marszałek.this material. The polymerized silica or the colloidal silica used for this purpose is usually called the "activated" silica.
Its use has already become standard practice in many municipal and industrial water purification : Takeshi Okura, Katsumi Goto, Minoru Murai.The thermochemical reaction of silicagel-water is suitable for long term storage of solar energy. There is no thermal degradation and charging temperatures of 75 °C are sufficient.
The useful heat from the storage depends strongly on some factors, like temperature and humidity of the inlet air, line temperature of the heating system at : R. Hallermayer, R. Sizmann.