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A novel method to synthesize amorphous silica-alumina materials with mesoporous distribution without using templates and pore-regulating agents
Yao, N; Xiong, GX; He, MY; Sheng, SS; Yang, WS; Bao, XH
Source PublicationCHEMISTRY OF MATERIALS
2002
DOI10.1021/cm010270w
Volume14Issue:1Pages:122-129
Indexed BySCI
SubtypeArticle
WOS HeadingsScience & Technology ; Physical Sciences ; Technology
WOS SubjectChemistry, Physical ; Materials Science, Multidisciplinary
WOS Research AreaChemistry ; Materials Science
WOS KeywordMOLECULAR-SIEVES ; POROUS STRUCTURE ; ACID CATALYSTS ; ALUMINOSILICATES
AbstractIn this study, a novel sol-gel method is used to synthesize amorphous silica-alumina materials with a narrow mesoporous distribution and various Si/Al molar ratios without using any templates and pore-regulating agents. During the preparation procedure, only inexpensive inorganic salts were used as raw materials, instead of expensive and harmful alkoxides. The precursor sol was dried at room temperature in a vacuum box kept at 60 mmHg until it began to form the gel. The results of a nitrogen sorption experiment indicate that the synthesized materials with different Si/Al molar ratios have similar mesoporous distributions (within 2-12 nm). Moreover, it was found that the material's pore size distribution remains at a similar value during the heat treatment from room temperature to 550 degreesC. On the basis of the nitrogen sorption, TEM, and AFM characterization results, a formation mechanism of mesopores which accounts for the experimental data is also suggested. This suggested mechanism involves rearrangement of the primary particles during the drying process to form the precursors of the similarly sized mesopores. The synthesized materials were characterized by XRD, thermal analysis (TG/DTA), Al-27 and Si-29 MAS NMR spectroscopy, SEM, TEM, and AFM. The results of Al-27 and 29Si MAS NMR indicate that the distribution of silicon and aluminum in the synthesized materials is more uniform and homogeneous than that in the mixed oxides prepared via the traditional sol-gel method even at high alumina contents. The type and density of the acid sites were studied using pyridine adsorption-desorption FTIR spectroscopy. It was shown that the acidity of the synthesized materials is higher than that of the silica-alumina materials prepared by conventional methods.
Language英语
URL查看原文
WOS IDWOS:000173459300025
Citation statistics
Cited Times:26[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://cas-ir.dicp.ac.cn/handle/321008/85689
Collection中国科学院大连化学物理研究所
Affiliation1.Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Peoples R China
2.SINOPEC, Res Inst Petr Proc, Beijing 100083, Peoples R China
Recommended Citation
GB/T 7714
Yao, N,Xiong, GX,He, MY,et al. A novel method to synthesize amorphous silica-alumina materials with mesoporous distribution without using templates and pore-regulating agents[J]. CHEMISTRY OF MATERIALS,2002,14(1):122-129.
APA Yao, N,Xiong, GX,He, MY,Sheng, SS,Yang, WS,&Bao, XH.(2002).A novel method to synthesize amorphous silica-alumina materials with mesoporous distribution without using templates and pore-regulating agents.CHEMISTRY OF MATERIALS,14(1),122-129.
MLA Yao, N,et al."A novel method to synthesize amorphous silica-alumina materials with mesoporous distribution without using templates and pore-regulating agents".CHEMISTRY OF MATERIALS 14.1(2002):122-129.
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