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Iron doped aluminophosphate molecular sieve with improved adsorption capacity for water vapor
- Source :
- Adsorption. 24:551-561
- Publication Year :
- 2018
- Publisher :
- Springer Science and Business Media LLC, 2018.
-
Abstract
- With a characteristic of S-shape isotherms for water vapor adsorption, aluminophosphate molecular sieve with AFI type (AlPO-5) has been considered as an up-and-coming adsorbent for the utilization in the adsorption cooling and heating (ACH) system. In order to improve its adsorption performance, iron doped AlPO-5 (FeAPO-5) with variable Fe loading was synthesized by microwave hydrothermal method. The effects of the iron doping content on the structure and adsorption performance were systematically investigated. The analysis results of X-ray diffraction (XRD), UV–visible spectroscopy (UV–Vis-DR) and scanning electron microscopy (SEM) showed that the iron ion was incorporated into aluminophosphate molecular sieves with a typical AFI structure as that of AlPO-5 through the isomorphous substitution. As the iron content of FeAlPO-5s increased, the isolated FeIII decreased, while oligonuclear FeIII and nanosized FeIII increased, besides, the static adsorption curves showed that the adsorption capacity of FeAlPO-5 increased first and then decrease. After iron modifying, the crystallinity and morphology of crystals was improved, and the adsorption performance increased from 0.185 g/g (AlPO-5A) to 0.235 g/g (FeAlPO-5), while the desorption performance of FeAlPO-5 (95.69 kJ/mol) was close to that of AlPO-5A (81.59 kJ/mol).
- Subjects :
- Materials science
Scanning electron microscope
020209 energy
General Chemical Engineering
Doping
Inorganic chemistry
02 engineering and technology
Surfaces and Interfaces
General Chemistry
Molecular sieve
Hydrothermal circulation
Crystallinity
Adsorption
Isomorphous substitution
Desorption
0202 electrical engineering, electronic engineering, information engineering
Subjects
Details
- ISSN :
- 15728757 and 09295607
- Volume :
- 24
- Database :
- OpenAIRE
- Journal :
- Adsorption
- Accession number :
- edsair.doi...........ea4a6886a2765c99229d78dd5b6179eb