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Distribution threshold values of CaCl$_{2}$ onto the 10X-zeolite and macro-pore silica gel

Content Provider	Springer Nature Link
Author	Tang, YouCheng Li, Bin Yang, JingChang Chu, Wei Luo, ShiZhong
Copyright Year	2009
Abstract	The calcium chloride used for adsorption separation of ammonia is promising for its large adsorptive capacity and lower desorption temperature, but difficult to develop because of the liable expansion, lump and chip in the adsorption/desorption process. Composite adsorbents made by monolayer dispersion of calcium chloride onto carriers with high surface areas exhibit better adsorptive capacity and stability. Several models were developed to confirm the maximum monolayer dispersion capacity of calcium chloride onto the carriers (the distribution threshold value), and the closely packed monolayer dispersion model was considered the most suitable for this study. The distribution threshold values given by this model were 0.60 g CaCl$_{2}$/(g 10X-zeolite) and 0.38 g CaCl$_{2}$/(g SiO$_{2}$). When the divalent salt was dispersed onto the carriers, however, anions were separated into two types, causing that the entropy of the system tended to increase and the system was not stable. To minimize the entropy, a new model was put forward as the modified closely packed monolayer dispersion model. Based on this model, the distribution threshold values are 0.52 g CaCl$_{2}$/(g 10X-zeolite) and 0.33 g CaCl$_{2}$/(g SiO$_{2}$), respectively. The distribution threshold values were also gained experimentally by XRD quantitative phase analysis: 0.61 g CaCl$_{2}$/(g 10X-zeolite) and 0.31 g CaCl$_{2}$/(g SiO$_{2}$). Comparison between experimental values of distribution threshold with theoretical ones based on two different model showed that the closely packed monolayer dispersion model fits the monolayer dispersion of calcium chloride onto micro-pore carrier —10X-zeolite, and the modified closely packed monolayer dispersion model is more suitable for the bigger aperture carrier —macro-pore silica gel.
Starting Page	231
Ending Page	235
Page Count	5
File Format	PDF
ISSN	10069291
Journal	Science in China Series B: Chemistry
Volume Number	52
Issue Number	2
e-ISSN	18622771
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2009-02-01
Publisher Place	Berlin, Heidelberg
Access Restriction	Subscribed
Subject Keyword	threshold value monolayer dispersion model 10X-zeolite macro-pore silica gel Chemistry/Food Science
Content Type	Text
Resource Type	Article
Subject	Chemistry

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