通过直接合成制备的 La 改性 SBA-15:确定实际成分的重要性

Catalysts Pub Date : 2024-07-08 DOI:10.3390/catal14070436
Gloribel Morales Hernández, José Escobar, J.G. Pacheco Sosa, Mario A. Guzmán Cruz, José G. Torres Torres, Paz del Ángel Vicente, M. Barrera, Carlos E. Santolalla Vargas, Hermicenda Pérez Vidal
{"title":"通过直接合成制备的 La 改性 SBA-15:确定实际成分的重要性","authors":"Gloribel Morales Hernández, José Escobar, J.G. Pacheco Sosa, Mario A. Guzmán Cruz, José G. Torres Torres, Paz del Ángel Vicente, M. Barrera, Carlos E. Santolalla Vargas, Hermicenda Pérez Vidal","doi":"10.3390/catal14070436","DOIUrl":null,"url":null,"abstract":"Lanthanum (La) integration (at various nominal contents) in SBA-15 prepared under acidic medium was intended from corresponding direct nitrate addition during mesoporous silica formation. Materials were impregnated with Pt (1.5 wt%) and studied through several textural (N2 physisorption), structural (XRD, TG-DTG), and surface (FTIR, STEM-HAADF, SEM-EDS, NH3, and CO2 TPD) instrumental techniques. Pt-impregnated solids were tested in phenol hydrodeoxygenation (HDO, T = 250 °C, 3.2 MPa, batch reactor, n-decane as solvent). Catalytic activity (in pseudo-first-order kinetic constant, kHDO basis) was not directly related to Pt dispersion, which was not determined by nominal rare earth content. Determining the actual composition of modified SBA-15 materials is crucial in reaching sound conclusions regarding their physicochemical properties, especially when La modifier is directly added during mesoporous matrix formation, where efficient interaction among constituents could be difficult to get. Otherwise, results from some characterization techniques (N2 physisorption and FTIR, for instance) could be misleading and even contradictory. Indeed, extant modifier precursors, when under SBA-15 synthesis conditions, could affect the properties of prepared materials even though they were absent in obtained formulations. Performing simple compositional analysis could eliminate uncertainties regarding the role of various modifiers on characteristics of final catalysts. However, several groups have failed in doing so.","PeriodicalId":505577,"journal":{"name":"Catalysts","volume":" 18","pages":""},"PeriodicalIF":0.0000,"publicationDate":"2024-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"La-Modified SBA-15 Prepared by Direct Synthesis: Importance of Determining Actual Composition\",\"authors\":\"Gloribel Morales Hernández, José Escobar, J.G. Pacheco Sosa, Mario A. Guzmán Cruz, José G. Torres Torres, Paz del Ángel Vicente, M. Barrera, Carlos E. Santolalla Vargas, Hermicenda Pérez Vidal\",\"doi\":\"10.3390/catal14070436\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"Lanthanum (La) integration (at various nominal contents) in SBA-15 prepared under acidic medium was intended from corresponding direct nitrate addition during mesoporous silica formation. Materials were impregnated with Pt (1.5 wt%) and studied through several textural (N2 physisorption), structural (XRD, TG-DTG), and surface (FTIR, STEM-HAADF, SEM-EDS, NH3, and CO2 TPD) instrumental techniques. Pt-impregnated solids were tested in phenol hydrodeoxygenation (HDO, T = 250 °C, 3.2 MPa, batch reactor, n-decane as solvent). Catalytic activity (in pseudo-first-order kinetic constant, kHDO basis) was not directly related to Pt dispersion, which was not determined by nominal rare earth content. Determining the actual composition of modified SBA-15 materials is crucial in reaching sound conclusions regarding their physicochemical properties, especially when La modifier is directly added during mesoporous matrix formation, where efficient interaction among constituents could be difficult to get. Otherwise, results from some characterization techniques (N2 physisorption and FTIR, for instance) could be misleading and even contradictory. Indeed, extant modifier precursors, when under SBA-15 synthesis conditions, could affect the properties of prepared materials even though they were absent in obtained formulations. Performing simple compositional analysis could eliminate uncertainties regarding the role of various modifiers on characteristics of final catalysts. However, several groups have failed in doing so.\",\"PeriodicalId\":505577,\"journal\":{\"name\":\"Catalysts\",\"volume\":\" 18\",\"pages\":\"\"},\"PeriodicalIF\":0.0000,\"publicationDate\":\"2024-07-08\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Catalysts\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://doi.org/10.3390/catal14070436\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Catalysts","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.3390/catal14070436","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 0

摘要

在酸性介质下制备的 SBA-15 中的镧 (La) 整合(以不同的名义含量)是在介孔二氧化硅形成过程中直接加入相应的硝酸盐而实现的。材料浸渍了铂(1.5 wt%),并通过多种质构(N2 物理吸附)、结构(XRD、TG-DTG)和表面(FTIR、STEM-HAADF、SEM-EDS、NH3 和 CO2 TPD)仪器技术进行了研究。铂浸渍固体在苯酚加氢脱氧(HDO,T = 250 °C,3.2 兆帕,间歇反应器,正癸烷为溶剂)中进行了测试。催化活性(以假一阶动力学常数 kHDO 为基础)与铂的分散性没有直接关系,铂的分散性不是由稀土的标称含量决定的。确定改性 SBA-15 材料的实际组成对于得出有关其理化性质的正确结论至关重要,尤其是在介孔基质形成过程中直接添加 La 改性剂时,成分之间可能难以产生有效的相互作用。否则,某些表征技术(例如 N2 物理吸附和傅立叶变换红外光谱)得出的结果可能会产生误导,甚至相互矛盾。事实上,在 SBA-15 合成条件下,现存的改性剂前体可能会影响制备材料的性能,即使在获得的配方中不存在这些前体。进行简单的成分分析可以消除各种改性剂对最终催化剂特性影响的不确定性。然而,一些研究小组未能做到这一点。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
La-Modified SBA-15 Prepared by Direct Synthesis: Importance of Determining Actual Composition
Lanthanum (La) integration (at various nominal contents) in SBA-15 prepared under acidic medium was intended from corresponding direct nitrate addition during mesoporous silica formation. Materials were impregnated with Pt (1.5 wt%) and studied through several textural (N2 physisorption), structural (XRD, TG-DTG), and surface (FTIR, STEM-HAADF, SEM-EDS, NH3, and CO2 TPD) instrumental techniques. Pt-impregnated solids were tested in phenol hydrodeoxygenation (HDO, T = 250 °C, 3.2 MPa, batch reactor, n-decane as solvent). Catalytic activity (in pseudo-first-order kinetic constant, kHDO basis) was not directly related to Pt dispersion, which was not determined by nominal rare earth content. Determining the actual composition of modified SBA-15 materials is crucial in reaching sound conclusions regarding their physicochemical properties, especially when La modifier is directly added during mesoporous matrix formation, where efficient interaction among constituents could be difficult to get. Otherwise, results from some characterization techniques (N2 physisorption and FTIR, for instance) could be misleading and even contradictory. Indeed, extant modifier precursors, when under SBA-15 synthesis conditions, could affect the properties of prepared materials even though they were absent in obtained formulations. Performing simple compositional analysis could eliminate uncertainties regarding the role of various modifiers on characteristics of final catalysts. However, several groups have failed in doing so.
求助全文
通过发布文献求助,成功后即可免费获取论文全文。 去求助
来源期刊
自引率
0.00%
发文量
0
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
确定
请完成安全验证×
copy
已复制链接
快去分享给好友吧!
我知道了
右上角分享
点击右上角分享
0
联系我们:info@booksci.cn Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号:481959085
Book学术官方微信