{"title":"用于甘油分解反应的 KIT-6 磺化催化剂。制备方法的影响","authors":"","doi":"10.1016/j.micromeso.2024.113318","DOIUrl":null,"url":null,"abstract":"<div><p>In this work, the KIT-6 silica support functionalized with different contents of sulfonic groups (10 and 15 % S/Si) was employed to prepare mesoporous acid catalysts. Catalysts with modified properties were obtained introducing the functional groups by co-condensation or grafting methods.</p><p>The catalytic activity was studied in the glicerolysis of soybean derived fatty acids, for the obtention of mono-, di- and triglycerides using a batch reactor. Vacuum was applied to eliminate water from the system and shift the equilibrium to the products. The effect of the catalytic formulation was studied modifying the synthesis method and the sulfonic content. Additionally, a comprehensive study was conducted regarding the distribution of products and by-products. The effect of reaction temperature, molar ratio of reactants (free fatty acids: glycerol) and catalyst concentration on conversion and selectivity was analyzed.</p><p>The solids were studied by numerous characterization techniques. It was found that the KIT-6 catalysts functionalized with sulfonic groups synthesized by grafting retained the original structure of KIT-6, as opposed to those modified by co-condensation. However, all the catalysts provided adequate catalytic activities in glycerolysis with relatively high conversions of 90 % in 3 h of reaction, indicating that these materials have potential for a more environmentally friendly process. In addition to the reversible esterification, secondary reactions occurred that decrease the selectivity to the desired products, which could be attributed to the presence of insaturations in the carbonaceous chain of the fatty acids used. Additionally, the recyclability of the catalysts was evaluated; demonstrating sustained catalytic activity for up to three cycles.</p></div>","PeriodicalId":392,"journal":{"name":"Microporous and Mesoporous Materials","volume":null,"pages":null},"PeriodicalIF":4.8000,"publicationDate":"2024-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"KIT-6 sulfonic catalysts for glycerolisis reaction. Influence of the preparation method\",\"authors\":\"\",\"doi\":\"10.1016/j.micromeso.2024.113318\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>In this work, the KIT-6 silica support functionalized with different contents of sulfonic groups (10 and 15 % S/Si) was employed to prepare mesoporous acid catalysts. Catalysts with modified properties were obtained introducing the functional groups by co-condensation or grafting methods.</p><p>The catalytic activity was studied in the glicerolysis of soybean derived fatty acids, for the obtention of mono-, di- and triglycerides using a batch reactor. Vacuum was applied to eliminate water from the system and shift the equilibrium to the products. The effect of the catalytic formulation was studied modifying the synthesis method and the sulfonic content. Additionally, a comprehensive study was conducted regarding the distribution of products and by-products. The effect of reaction temperature, molar ratio of reactants (free fatty acids: glycerol) and catalyst concentration on conversion and selectivity was analyzed.</p><p>The solids were studied by numerous characterization techniques. It was found that the KIT-6 catalysts functionalized with sulfonic groups synthesized by grafting retained the original structure of KIT-6, as opposed to those modified by co-condensation. However, all the catalysts provided adequate catalytic activities in glycerolysis with relatively high conversions of 90 % in 3 h of reaction, indicating that these materials have potential for a more environmentally friendly process. In addition to the reversible esterification, secondary reactions occurred that decrease the selectivity to the desired products, which could be attributed to the presence of insaturations in the carbonaceous chain of the fatty acids used. Additionally, the recyclability of the catalysts was evaluated; demonstrating sustained catalytic activity for up to three cycles.</p></div>\",\"PeriodicalId\":392,\"journal\":{\"name\":\"Microporous and Mesoporous Materials\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":4.8000,\"publicationDate\":\"2024-09-05\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Microporous and Mesoporous Materials\",\"FirstCategoryId\":\"88\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S1387181124003408\",\"RegionNum\":3,\"RegionCategory\":\"材料科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"CHEMISTRY, APPLIED\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Microporous and Mesoporous Materials","FirstCategoryId":"88","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S1387181124003408","RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CHEMISTRY, APPLIED","Score":null,"Total":0}
KIT-6 sulfonic catalysts for glycerolisis reaction. Influence of the preparation method
In this work, the KIT-6 silica support functionalized with different contents of sulfonic groups (10 and 15 % S/Si) was employed to prepare mesoporous acid catalysts. Catalysts with modified properties were obtained introducing the functional groups by co-condensation or grafting methods.
The catalytic activity was studied in the glicerolysis of soybean derived fatty acids, for the obtention of mono-, di- and triglycerides using a batch reactor. Vacuum was applied to eliminate water from the system and shift the equilibrium to the products. The effect of the catalytic formulation was studied modifying the synthesis method and the sulfonic content. Additionally, a comprehensive study was conducted regarding the distribution of products and by-products. The effect of reaction temperature, molar ratio of reactants (free fatty acids: glycerol) and catalyst concentration on conversion and selectivity was analyzed.
The solids were studied by numerous characterization techniques. It was found that the KIT-6 catalysts functionalized with sulfonic groups synthesized by grafting retained the original structure of KIT-6, as opposed to those modified by co-condensation. However, all the catalysts provided adequate catalytic activities in glycerolysis with relatively high conversions of 90 % in 3 h of reaction, indicating that these materials have potential for a more environmentally friendly process. In addition to the reversible esterification, secondary reactions occurred that decrease the selectivity to the desired products, which could be attributed to the presence of insaturations in the carbonaceous chain of the fatty acids used. Additionally, the recyclability of the catalysts was evaluated; demonstrating sustained catalytic activity for up to three cycles.
期刊介绍:
Microporous and Mesoporous Materials covers novel and significant aspects of porous solids classified as either microporous (pore size up to 2 nm) or mesoporous (pore size 2 to 50 nm). The porosity should have a specific impact on the material properties or application. Typical examples are zeolites and zeolite-like materials, pillared materials, clathrasils and clathrates, carbon molecular sieves, ordered mesoporous materials, organic/inorganic porous hybrid materials, or porous metal oxides. Both natural and synthetic porous materials are within the scope of the journal.
Topics which are particularly of interest include:
All aspects of natural microporous and mesoporous solids
The synthesis of crystalline or amorphous porous materials
The physico-chemical characterization of microporous and mesoporous solids, especially spectroscopic and microscopic
The modification of microporous and mesoporous solids, for example by ion exchange or solid-state reactions
All topics related to diffusion of mobile species in the pores of microporous and mesoporous materials
Adsorption (and other separation techniques) using microporous or mesoporous adsorbents
Catalysis by microporous and mesoporous materials
Host/guest interactions
Theoretical chemistry and modelling of host/guest interactions
All topics related to the application of microporous and mesoporous materials in industrial catalysis, separation technology, environmental protection, electrochemistry, membranes, sensors, optical devices, etc.