Synthesis of Well-Ordered Mesoporous Aluminosilicates with High Aluminum Contents: The Challenge and the Promise
SBA-15 has recently emerged as a potential material for the catalytic conversion of large molecules. Usually, SBA-15 has a low content of aluminum due to the conventional acidic synthesis medium. Although a few approaches have been adopted to prepare Al–SBA-15 with a high alumina content, it is stil...
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Published in | Inorganic chemistry Vol. 61; no. 30; pp. 11820 - 11829 |
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Main Authors | , , , , , , , , |
Format | Journal Article |
Language | English |
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American Chemical Society
01.08.2022
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Abstract | SBA-15 has recently emerged as a potential material for the catalytic conversion of large molecules. Usually, SBA-15 has a low content of aluminum due to the conventional acidic synthesis medium. Although a few approaches have been adopted to prepare Al–SBA-15 with a high alumina content, it is still challenging to prepare well-ordered Al–SBA-15 with a high alumina content. Here, we demonstrate a facile synthesis process in neutral mediums for the grafting of Al into the framework of SBA-15. This approach relies mainly on the dissociation of Si–O–Si bonds and the polymerization of Si–O–Si/Al bonds promoted by sodium persulfate (SPS) in neutral mediums. In this way, well-ordered Al–SBA-15 with a high aluminum content and enhanced acidity was obtained. Results of X-ray fluorescence spectroscopy (XRF) showed an n(SiO2)/n(Al2O3) ratio of 13.7, much lower than that of the conventional sample (21.7) obtained in acidic medium. The characterization results indicated the presence of a well-ordered Al-containing mesophase with high hydrothermal stability. Notably, the Al content and the acidity of Al–SBA-15 can be tuned by changing the SPS amount. |
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AbstractList | SBA-15 has recently emerged as a potential material for the catalytic conversion of large molecules. Usually, SBA-15 has a low content of aluminum due to the conventional acidic synthesis medium. Although a few approaches have been adopted to prepare Al–SBA-15 with a high alumina content, it is still challenging to prepare well-ordered Al–SBA-15 with a high alumina content. Here, we demonstrate a facile synthesis process in neutral mediums for the grafting of Al into the framework of SBA-15. This approach relies mainly on the dissociation of Si–O–Si bonds and the polymerization of Si–O–Si/Al bonds promoted by sodium persulfate (SPS) in neutral mediums. In this way, well-ordered Al–SBA-15 with a high aluminum content and enhanced acidity was obtained. Results of X-ray fluorescence spectroscopy (XRF) showed an n(SiO2)/n(Al2O3) ratio of 13.7, much lower than that of the conventional sample (21.7) obtained in acidic medium. The characterization results indicated the presence of a well-ordered Al-containing mesophase with high hydrothermal stability. Notably, the Al content and the acidity of Al–SBA-15 can be tuned by changing the SPS amount. |
Author | Xie, Fangming Zhou, Jiayu Deng, Yixiong Liu, Honghai Li, Haiyan Gao, Xionghou Yue, Yuanyuan Liu, Hongtao Li, Gen |
AuthorAffiliation | National Engineering Research Center of Chemical Fertilizer Catalyst, College of Chemical Engineering China Petroleum Technology and Development Corporation State Key Laboratory of Chemical Resource Engineering Petrochemical Research Institute |
AuthorAffiliation_xml | – name: Petrochemical Research Institute – name: State Key Laboratory of Chemical Resource Engineering – name: National Engineering Research Center of Chemical Fertilizer Catalyst, College of Chemical Engineering – name: China Petroleum Technology and Development Corporation |
Author_xml | – sequence: 1 givenname: Yixiong surname: Deng fullname: Deng, Yixiong organization: State Key Laboratory of Chemical Resource Engineering – sequence: 2 givenname: Jiayu surname: Zhou fullname: Zhou, Jiayu organization: State Key Laboratory of Chemical Resource Engineering – sequence: 3 givenname: Gen surname: Li fullname: Li, Gen organization: China Petroleum Technology and Development Corporation – sequence: 4 givenname: Honghai surname: Liu fullname: Liu, Honghai organization: Petrochemical Research Institute – sequence: 5 givenname: Xionghou surname: Gao fullname: Gao, Xionghou organization: Petrochemical Research Institute – sequence: 6 givenname: Yuanyuan orcidid: 0000-0002-0385-9131 surname: Yue fullname: Yue, Yuanyuan organization: National Engineering Research Center of Chemical Fertilizer Catalyst, College of Chemical Engineering – sequence: 7 givenname: Haiyan surname: Li fullname: Li, Haiyan organization: Petrochemical Research Institute – sequence: 8 givenname: Fangming surname: Xie fullname: Xie, Fangming organization: Petrochemical Research Institute – sequence: 9 givenname: Hongtao orcidid: 0000-0002-4585-5980 surname: Liu fullname: Liu, Hongtao email: liuht@mail.buct.edu.cn organization: State Key Laboratory of Chemical Resource Engineering |
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CitedBy_id | crossref_primary_10_1016_j_jmbbm_2024_106624 crossref_primary_10_1021_acs_iecr_3c02395 crossref_primary_10_1016_j_petsci_2022_11_028 crossref_primary_10_1016_j_micromeso_2024_112997 crossref_primary_10_1080_02603594_2022_2138864 crossref_primary_10_1016_j_jcis_2024_02_180 |
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