Synthesis of MgCl 2 /vermiculite and its water vapor adsorption‐desorption performance

2021 ◽  
Author(s):  
Huizhong Zhao ◽  
Tianhou Huang ◽  
Tao Liu ◽  
Min Lei ◽  
Min Zhang
Keyword(s):  
Water Vapor ◽  
Water Vapor Adsorption ◽  
Vapor Adsorption ◽  
Adsorption Desorption

scholarly journals Effect of Both the Phase Composition and Modification Methods on Structural-Adsorption Parameters of Dispersed Silicas

2018 ◽  
Vol 3 (1) ◽  
pp. 1 ◽  
Author(s):  
Tatyana Rakitskaya ◽  
Tatyana Kiose ◽  
Kristina Golubchik ◽  
Viacheslav Baumer ◽  
Vitaliya Volkova
Keyword(s):  
Water Vapor ◽  
Water Vapor Adsorption ◽  
X Ray Diffraction ◽  
Adsorption Parameters ◽  
X Ray ◽  
Vapor Adsorption ◽  
Crystallite Sizes ◽  
Desorption Isotherms ◽  
Adsorption Desorption ◽  
Modified Forms

Tripoli from two Ukrainian deposits was studied in its natural and modified forms. The investigation of natural and modified tripoli involves the identification of their phase compositions through X-ray diffraction and the analysis of their water vapor adsorption-desorption isotherms. The obtained results are evidence of changes in the structural-adsorption parameters of tripoli as a result of modification. Their treatment in boiling water or acid causes apparent alterations of contents of the main phases and sizes of their crystallites, whereas their calcination causes not only the dehydroxylation of surfaces and the agglomeration of phases, but even phase transformation in the case of carbonate tripoli. After analyzing water vapor adsorption-desorption isotherms of natural and modified tripolis, some correlations between their adsorption parameters, phase compositions, main phase contents and crystallite sizes have been found.

Dry Gel Conversion Synthesis of Hierarchical Porous MIL-100(Fe) and Its Water Vapor Adsorption/Desorption Performance

2019 ◽  
Vol 58 (19) ◽  
pp. 7801-7807 ◽  
Author(s):  
Yanshu Luo ◽  
Bingqiong Tan ◽  
Xianghui Liang ◽  
Shuangfeng Wang ◽  
Xuenong Gao ◽  
...  
Keyword(s):  
Water Vapor ◽  
Water Vapor Adsorption ◽  
Vapor Adsorption ◽  
Dry Gel Conversion ◽  
Hierarchical Porous ◽  
Adsorption Desorption

Diffusion Barriers in the Kinetics of Water Vapor Adsorption/Desorption on Activated Carbons

Langmuir ◽  
1998 ◽  
Vol 14 (14) ◽  
pp. 3858-3864 ◽  
Author(s):  
A. W. Harding ◽  
N. J. Foley ◽  
P. R. Norman ◽  
D. C. Francis ◽  
K. M. Thomas
Keyword(s):  
Water Vapor ◽  
Activated Carbons ◽  
Water Vapor Adsorption ◽  
Diffusion Barriers ◽  
Vapor Adsorption ◽  
Adsorption Desorption ◽  
Kinetics Of

Novel porous ultrathin NiO nanosheets for highly efficient water vapor adsorption-desorption

2019 ◽  
Vol 226 ◽  
pp. 299-303 ◽  
Author(s):  
Yunan Wang ◽  
Yan Chen ◽  
Jianmin Wang ◽  
Xinchao Xv ◽  
Xi Yang ◽  
...  
Keyword(s):  
Water Vapor ◽  
Water Vapor Adsorption ◽  
Vapor Adsorption ◽  
Highly Efficient ◽  
Adsorption Desorption ◽  
Nio Nanosheets

scholarly journals Cooling Capacity Test for MIL-101(Cr)/CaCl2 for Adsorption Refrigeration System

Molecules ◽  
2020 ◽  
Vol 25 (17) ◽  
pp. 3975
Author(s):  
Zhongbao Liu ◽  
Banghua Zhao ◽  
Yong Huang ◽  
Xin Qi ◽  
Fengfei Lou
Keyword(s):  
Water Vapor ◽  
Cooling Capacity ◽  
Water Vapor Adsorption ◽  
Condensation Temperature ◽  
Refrigeration System ◽  
Adsorption Refrigeration ◽  
Vapor Adsorption ◽  
Evaporation Temperature ◽  
Adsorption Temperature ◽  
Adsorption Desorption

An MIL-101(Cr) powder material was successfully prepared using the hydrothermal synthesis method, and then the original MIL-101(Cr) was combined with different mass fractions of CaCl2 using the immersion method to obtain a MIL-101(Cr)/CaCl2 composite material. The physical properties of the adsorbent were determined by X-ray powder diffraction (XRD), an N2 adsorption desorption isotherm test, and thermogravimetric analysis (TG). The water vapor adsorption performance of the metal-organic frameworks MOFs was tested with a gravimetric water vapor adsorption instrument to analyze its water vapor adsorption mechanism. Based on the SIMULINK platform in the MATLAB software, a simulation model of the coefficient of performance (COP) and cooling capacity of the adsorption refrigeration system was established, and the variation trends of the COP and cooling capacity of the adsorption refrigeration system under different evaporation/condensation/adsorption/desorption temperatures was theoretically studied. MIL101-(Cr)/CaCl2-20% was selected as the adsorption material in the adsorption refrigeration system through the physical characterization of composite materials with different CaCl2 concentrations by means of adsorption water vapor test experiments. A closed adsorption system performance test device was built based on the liquid level method. The cooling power per unit and adsorbent mass (COP and SCP) of the system were tested at different evaporation temperatures (288 K/293 K/298 K); the adsorption temperature was 298 K, the condensation temperature was 308 K, and the desorption temperature was 353 K. The experimental results showed that COP and SCP increased with the increase in the evaporation temperature. When the evaporation temperature was 298 K, the level of COP was 0.172, and the level of SCP was 136.9 W/kg. The COP and SCP of the system were tested at different adsorption temperatures (293 K/298 K/303 K); the evaporation temperature was 288 K, the condensation temperature was 308 K, and the desorption temperature was 353 K. The experimental results showed that the levels of COP and SCP decreased with the increase in the adsorption temperature. When the adsorption temperature was 293 K, the level of COP was 0.18, and the level of SCP was 142.4 W/kg.

scholarly journals Water Vapor Adsorption/Desorption on Two Fully Characterized Commercial Activated Carbons

2015 ◽  
Vol 61 (1) ◽  
pp. 622-627 ◽  
Author(s):  
Frédéric Plantier ◽  
Kamila Marques Fernandes ◽  
Carine Malheiro ◽  
Bernard Delanghe ◽  
Christelle Miqueu
Keyword(s):  
Water Vapor ◽  
Activated Carbons ◽  
Water Vapor Adsorption ◽  
Vapor Adsorption ◽  
Adsorption Desorption

scholarly journals Differences in Water Vapor Adsorption-Desorption of Non Aged and 3-Year Aged Biochar in Sandy Spodosols

2019 ◽  
Vol 22 (2) ◽  
pp. 56-60
Author(s):  
Eugene Balashov ◽  
Irina Mukhina ◽  
Elena Rizhiya
Keyword(s):  
Water Vapor ◽  
Water Vapor Adsorption ◽  
High Quality ◽  
Water Desorption ◽  
Vapor Adsorption ◽  
Water Potentials ◽  
Adsorption Processes ◽  
Medium Quality ◽  
Adsorption Desorption ◽  
Hygroscopic Water

Abstract Ageing of biochars in soil affects their surface properties and can cause changes in water vapor adsorption-desorption processes. Measurements of hygroscopic water contents and corresponding water potentials of non aged and 3-year aged biochars as well as of sandy soils with medium and high quality were carried out during 5 cycles of water vapor adsorption-desorption processes at a room temperature of 23.5 °C. The results showed a significantly lower content of maximum hygroscopic water in the aged biochars than that in the non aged biochar at the end of water vapor adsorption processes at high air humidity. A significantly higher affinity of the high quality soil to water vapor resulted in insignificant differences in the maximum hygroscopic water content and in significant changes in the corresponding water potentials as compared to the same properties of the soil with medium quality. Minimum content of hygroscopic water was significantly lower in the non aged biochar than in the aged biochars at the end of the water desorption processes at ambient laboratory atmosphere. There were insignificant differences in minimum contents of hygroscopic water and in the corresponding water potentials of the aged biochars from soils with medium and high quality.

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