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Direct synthesis of Al-SBA-15 mesoporous materials via hydrolysis-controlled approach; Direct synthesis of Al-SBA-15 mesoporous materials via hydrolysis-controlled approach
Li, Y; Zhang, WH; Zhang, L; Yang, QH; Wei, ZB; Feng, ZC; Li, C
Source PublicationJOURNAL OF PHYSICAL CHEMISTRY B ; JOURNAL OF PHYSICAL CHEMISTRY B
2004-07-15 ; 2004-07-15
DOI10.1021/jp049824j ; 10.1021/jp049824j
Volume108Issue:28Pages:9739-9744
Indexed BySCI ; SCI
SubtypeArticle ; Article
Funding Project506, 503 ; 506, 503
Contribution Rank1;1 ; 1;1
WOS HeadingsScience & Technology ; Science & Technology ; Physical Sciences ; Physical Sciences
WOS SubjectChemistry, Physical ; Chemistry, Physical
WOS Research AreaChemistry ; Chemistry
WOS KeywordFRIEDEL-CRAFTS ALKYLATION ; FRIEDEL-CRAFTS ALKYLATION ; MOLECULAR-SIEVES ; MOLECULAR-SIEVES ; ALUMINUM ISOPROPOXIDE ; ALUMINUM ISOPROPOXIDE ; PYRIDINE ADSORPTION ; PYRIDINE ADSORPTION ; SURFACE-ACIDITY ; SURFACE-ACIDITY ; POROUS TEXTURE ; POROUS TEXTURE ; SILICA ; SILICA ; SBA-15 ; SBA-15 ; MCM-41 ; MCM-41 ; FLUORIDE ; FLUORIDE
AbstractAluminum-substituted mesoporous SBA-15 (Al-SBA-15) materials were directly synthesized by a hydrolysis-controlled approach in which the hydrolysis of the silicon precursor (tetraethyl orthosilicate, TEOS) is accelerated by fluoride or by using tetramethyl orthosilicate (TMOS) as silicon precursor rather than TEOS. These materials were characterized by powder X-ray diffraction (XRD), N-2 sorption isotherms, TEM, Al-27 MAS NMR, IR spectra of pyridine adsorption, and NH3-TPD. It is found that the matched hydrolysis and condensation rates of silicon and aluminum precursors are important factors to achieve highly ordered mesoporous materials. Al-27 MAS NMR spectra of Al-SBA-15 show that all aluminum species were incorporated into the silica framework for the samples prepared with the addition of fluoride. A two-step approach (sol-gel reaction at low pH followed by crystallization at high pH) was also employed for the synthesis of Al-SBA-15. Studies show that the two-step approach could efficiently avoid the leaching of aluminum from the framework of the material. The calcined Al-SBA-15 materials show highly ordered hexagonal mesostructure and have both Bronsted and Lewis acid sites with medium acidity.; Aluminum-substituted mesoporous SBA-15 (Al-SBA-15) materials were directly synthesized by a hydrolysis-controlled approach in which the hydrolysis of the silicon precursor (tetraethyl orthosilicate, TEOS) is accelerated by fluoride or by using tetramethyl orthosilicate (TMOS) as silicon precursor rather than TEOS. These materials were characterized by powder X-ray diffraction (XRD), N-2 sorption isotherms, TEM, Al-27 MAS NMR, IR spectra of pyridine adsorption, and NH3-TPD. It is found that the matched hydrolysis and condensation rates of silicon and aluminum precursors are important factors to achieve highly ordered mesoporous materials. Al-27 MAS NMR spectra of Al-SBA-15 show that all aluminum species were incorporated into the silica framework for the samples prepared with the addition of fluoride. A two-step approach (sol-gel reaction at low pH followed by crystallization at high pH) was also employed for the synthesis of Al-SBA-15. Studies show that the two-step approach could efficiently avoid the leaching of aluminum from the framework of the material. The calcined Al-SBA-15 materials show highly ordered hexagonal mesostructure and have both Bronsted and Lewis acid sites with medium acidity.
Language英语 ; 英语
URL查看原文 ; 查看原文
WOS IDWOS:000222639900030 ; WOS:000222639900030
Citation statistics
Cited Times:184[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://cas-ir.dicp.ac.cn/handle/321008/82277
Collection中国科学院大连化学物理研究所
AffiliationChinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Peoples R China
Recommended Citation
GB/T 7714
Li, Y,Zhang, WH,Zhang, L,et al. Direct synthesis of Al-SBA-15 mesoporous materials via hydrolysis-controlled approach, Direct synthesis of Al-SBA-15 mesoporous materials via hydrolysis-controlled approach[J]. JOURNAL OF PHYSICAL CHEMISTRY B, JOURNAL OF PHYSICAL CHEMISTRY B,2004, 2004,108, 108(28):9739-9744, 9739-9744.
APA Li, Y.,Zhang, WH.,Zhang, L.,Yang, QH.,Wei, ZB.,...&Li, C.(2004).Direct synthesis of Al-SBA-15 mesoporous materials via hydrolysis-controlled approach.JOURNAL OF PHYSICAL CHEMISTRY B,108(28),9739-9744.
MLA Li, Y,et al."Direct synthesis of Al-SBA-15 mesoporous materials via hydrolysis-controlled approach".JOURNAL OF PHYSICAL CHEMISTRY B 108.28(2004):9739-9744.
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