{"title":"A sandwich framework effect on the conversion of cylindrical pore into slit pore and its catalytic application","authors":"Karthika Devi, Chellapandian Kannan","doi":"10.1007/s10934-024-01563-2","DOIUrl":null,"url":null,"abstract":"<div><p>CO<sub>2</sub> is the most prevalent greenhouse gas that traps heat and raises the global temperature. To stabilize or reduce concentrations of this greenhouse gas, it is mandatory to decompose CO<sub>2</sub>. So we have synthesized AlPO<sub>4</sub> and ZnO<sub>4</sub>-AlPO<sub>4</sub> catalysts using tetrapropylammonium hydroxide (TPAOH) as a template. The synthesized catalysts are systematically characterized by physicochemical methods. XRD analysis proved that AlPO<sub>4</sub> has a tetrahedral framework. But the ZnO<sub>4</sub>-AlPO<sub>4</sub> has two separate frameworks, such as a novel ZnO<sub>4</sub> and AlPO<sub>4</sub>, in which the ZnO<sub>4</sub> framework is sandwiched between the AlPO<sub>4</sub> frameworks. As of now, such kind of sandwich framework has not yet been reported. Textural evaluation shows that there is a formation of two types of pores, namely cylindrical (AlPO<sub>4</sub>) and slit-shaped pore (ZnO<sub>4</sub>-AlPO<sub>4</sub>). The conversion of cylindrical pores into slit pores in ZnO<sub>4</sub>-AlPO<sub>4</sub> may be due to the formation of a ZnO<sub>4</sub> sandwiched framework in AlPO<sub>4</sub>. It is confirmed by the BET analysis. The acidity and thermal stability of the materials are confirmed by the TPD and TGA analyses. The acidity of AlPO<sub>4</sub> (0.44 mmol/g) may be due to the deposition of Al<sup>3+</sup> in the pores and surface of the material. The HR-TEM analysis proved the morphology of the synthesized materials. The synthesized materials are applied for CO<sub>2</sub> decomposition. The maximum conversion is reached above 95% and oxygen selectivity is above 55% in both catalysts.</p></div>","PeriodicalId":660,"journal":{"name":"Journal of Porous Materials","volume":null,"pages":null},"PeriodicalIF":2.5000,"publicationDate":"2024-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Porous Materials","FirstCategoryId":"88","ListUrlMain":"https://link.springer.com/article/10.1007/s10934-024-01563-2","RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"CHEMISTRY, APPLIED","Score":null,"Total":0}
引用次数: 0
Abstract
CO2 is the most prevalent greenhouse gas that traps heat and raises the global temperature. To stabilize or reduce concentrations of this greenhouse gas, it is mandatory to decompose CO2. So we have synthesized AlPO4 and ZnO4-AlPO4 catalysts using tetrapropylammonium hydroxide (TPAOH) as a template. The synthesized catalysts are systematically characterized by physicochemical methods. XRD analysis proved that AlPO4 has a tetrahedral framework. But the ZnO4-AlPO4 has two separate frameworks, such as a novel ZnO4 and AlPO4, in which the ZnO4 framework is sandwiched between the AlPO4 frameworks. As of now, such kind of sandwich framework has not yet been reported. Textural evaluation shows that there is a formation of two types of pores, namely cylindrical (AlPO4) and slit-shaped pore (ZnO4-AlPO4). The conversion of cylindrical pores into slit pores in ZnO4-AlPO4 may be due to the formation of a ZnO4 sandwiched framework in AlPO4. It is confirmed by the BET analysis. The acidity and thermal stability of the materials are confirmed by the TPD and TGA analyses. The acidity of AlPO4 (0.44 mmol/g) may be due to the deposition of Al3+ in the pores and surface of the material. The HR-TEM analysis proved the morphology of the synthesized materials. The synthesized materials are applied for CO2 decomposition. The maximum conversion is reached above 95% and oxygen selectivity is above 55% in both catalysts.
期刊介绍:
The Journal of Porous Materials is an interdisciplinary and international periodical devoted to all types of porous materials. Its aim is the rapid publication
of high quality, peer-reviewed papers focused on the synthesis, processing, characterization and property evaluation of all porous materials. The objective is to
establish a unique journal that will serve as a principal means of communication for the growing interdisciplinary field of porous materials.
Porous materials include microporous materials with 50 nm pores.
Examples of microporous materials are natural and synthetic molecular sieves, cationic and anionic clays, pillared clays, tobermorites, pillared Zr and Ti
phosphates, spherosilicates, carbons, porous polymers, xerogels, etc. Mesoporous materials include synthetic molecular sieves, xerogels, aerogels, glasses, glass
ceramics, porous polymers, etc.; while macroporous materials include ceramics, glass ceramics, porous polymers, aerogels, cement, etc. The porous materials
can be crystalline, semicrystalline or noncrystalline, or combinations thereof. They can also be either organic, inorganic, or their composites. The overall
objective of the journal is the establishment of one main forum covering the basic and applied aspects of all porous materials.