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Feng Deng – One of the best experts on this subject based on the ideXlab platform.

  • Synthesis of Aluminophosphate Molecular Sieves in Alkaline Media.
    Chemistry: A European Journal, 2020
    Co-Authors: Na Sheng, Feng Deng, Qianwen Zhu, Xin Hong, Juan Zhang, Junliang Sun, Zhaochi Feng, Liang Wang
    Abstract:

    Unlike conventional aluminosilicate zeolites synthesized in alkaline media, aluminophosphate molecular sieves (AlPOs) have always been prepared under acidic conditions in the past three decades; this has been regarded as one of essential factors for synthesis, except for the case of silica-substituted analogues (SAPOs). For the first time, we demonstrate herein a simple and generalized route for synthesizing various types of aluminophosphate molecular sieves in alkaline media. A series of aluminophosphate sieves and their analogues have been prepared with different quaternary ammonium cations as structure-directing agents in this manner. The above successes have extended the systematic media from acidic or neutral to alkaline for the preparation of a series of aluminophosphate molecular sieves, which possibly open an alternative route for the synthesis of aluminophosphate molecular sieves.

  • temperature dependence of the influence of the position 2 methyl group on the structure directing effect of piperazine in the synthesis of open framework Aluminophosphates
    Scientific Reports, 2016
    Co-Authors: Pai Huang, Feng Deng, Wenfu Yan
    Abstract:

    The temperature-dependence of the influence of the position-2-methyl group on the structure-directing effect of piperazine in the synthesis of open-framework Aluminophosphates was investigated. By heating the initial mixture with the composition of Al2O3:1.5 P2O5:R:125 H2O at 160 degrees C, where R is the structure-directing agent of 2-methylpiperazine or piperazine, layered Aluminophosphates APMeP150 (R = 2-methylpiperazine) and AP2pip (R = piperazine) were obtained. When the same initial reaction mixture was heated at 190 degrees C, layered Aluminophosphates APMeP200 (R = 2-methylpiperazine) and AP2pip (R = piperazine) were crystallized. APMeP200 and AP2pip have the same inorganic sheet topology. We investigated the crystallization processes of the four open-framework Aluminophosphates and found that increasing the heating temperature slowed the crystallization of the initial mixtures. The non-bonding interactions between the inorganic layers of the four open-framework Aluminophosphates and the experimental or theoretically generated structure-directing agents were calculated. The possible starting points of the crystallization of the four open-framework Aluminophosphates were analysed and compared. The temperature-dependence of the influence of the position-2-methyl group on the structure-directing effect of piperazine revealed that the structure-directing effect, the most important factor in the synthesis of zeolites and related open-framework materials, is determined by multiple factors. The structural parameters of the same compound can be affected by the synthesis conditions.

  • molecular engineering of microporous crystals vi structure directing effect in the crystallization process of layered Aluminophosphates
    Microporous and Mesoporous Materials, 2012
    Co-Authors: Xiaoqiang Tong, Wenfu Yan, Feng Deng, Liang Xin, Pai Huang, Chao Wang, Huai Sun
    Abstract:

    The products of piperazine-directed synthesis of two-dimensional (20) Aluminophosphates, AP2pip and AIPO-CJ9, that were crystallized under different conditions for different periods of time were freeze-dried and characterized using XRD and NMR techniques. The core units of the layered Aluminophosphates including AP2pip, AIPO-CJ9, and L-DAP, which was hydrothermally synthesized in the presence of racemic 1,2-diaminopropane, were obtained by applying a “reverse evolution” process to their structures. The factors affecting the structure-directing ability of piperazine under acidic and basic conditions were analyzed. The cooperative role of water in directing the layered aluminophosphate of AP2pip under acidic conditions is discussed. After a thorough analysis of the core units of AIPO-CJ9 and L-DAP, a new phenomenon of a “topological-structure-directing effect” or a “topological-templating effect” was observed. The observation of the new phenomenon of a topological-structure-directing effect or a topological-templating effect may contribute to a deeper understanding of the nature or origin of the “structure-directing or templating effect”. (C) 2012 Elsevier Inc. All rights reserved.

Wenqin Pang – One of the best experts on this subject based on the ideXlab platform.

  • Mixed-bonded open-framework Aluminophosphates and related layered materials
    Topics in Catalysis, 1999
    Co-Authors: Jiesheng Chen, Wenqin Pang
    Abstract:

    The structural features, the synthesis and the role of templates in the synthesis for mixed-bonded open-framework Aluminophosphates and related layered materials will be reviewed in this article. These aluminophosphate materials differ from the (4,2)-connected Aluminophosphates and zeolites in that they contain TO5 and/or TO6 primary building units or terminal T-O bonds (T stands for Al or P). The extra ligands for the TO5 and TO6 units in the Aluminophosphates with framework Al/P = 1 are either bridging OH groups or H2O molecules in most cases whereas the terminal T-O bonds are either P-OH or P=O species with P=O bonds being prevalent in layered Aluminophosphates. Most of TO5 or TO6 containing Aluminophosphates are prepared using a cyclic aminamine or a diamine as the structure directing agent (template), and the Aluminophosphates with Al/P

  • mixed bonded open framework Aluminophosphates and related layered materials
    Topics in Catalysis, 1999
    Co-Authors: Jiesheng Chen, Wenqin Pang
    Abstract:

    The structural features, the synthesis and the role of templates in the synthesis for mixed-bonded open-framework Aluminophosphates and related layered materials will be reviewed in this article. These aluminophosphate materials differ from the (4,2)-connected Aluminophosphates and zeolites in that they contain TO5 and/or TO6 primary building units or terminal T-O bonds (T stands for Al or P). The extra ligands for the TO5 and TO6 units in the Aluminophosphates with framework Al/P = 1 are either bridging OH groups or H2O molecules in most cases whereas the terminal T-O bonds are either P-OH or P=O species with P=O bonds being prevalent in layered Aluminophosphates. Most of TO5 or TO6 containing Aluminophosphates are prepared using a cyclic aminamine or a diamine as the structure directing agent (template), and the Aluminophosphates with Al/P<1 or the layered materials tend to form from an alcoholic medium. Both synthetic conditions and templates play a critical role in determining the composition and structural feature of these materials.

  • THE CRYSTALLIZATION OF ALUMINOPHOSPHATE MICROPOROUS COMPOUNDS IN ALCOHOLIC SYSTEM
    Proceedings from the Ninth International Zeolite Conference, 1993
    Co-Authors: Qisheng Huo, Wenqin Pang
    Abstract:

    Syntheses of aluminophosphate microporous compounds, both zeolite-type and layered aluminophosphate materials containing organic amines, in the presence of various amines from alcohol media are described. The results of investigation into the crystallization of aluminophosphate from nonaqueous systems are preliminarily summarized. The influences of some main factors (organic amine template, alcohol solvent, crystallization temperature, time, etc.) on the resulting structures are studied.

Jiesheng Chen – One of the best experts on this subject based on the ideXlab platform.

  • Mixed-bonded open-framework Aluminophosphates and related layered materials
    Topics in Catalysis, 1999
    Co-Authors: Jiesheng Chen, Wenqin Pang
    Abstract:

    The structural features, the synthesis and the role of templates in the synthesis for mixed-bonded open-framework Aluminophosphates and related layered materials will be reviewed in this article. These aluminophosphate materials differ from the (4,2)-connected Aluminophosphates and zeolites in that they contain TO5 and/or TO6 primary building units or terminal T-O bonds (T stands for Al or P). The extra ligands for the TO5 and TO6 units in the Aluminophosphates with framework Al/P = 1 are either bridging OH groups or H2O molecules in most cases whereas the terminal T-O bonds are either P-OH or P=O species with P=O bonds being prevalent in layered Aluminophosphates. Most of TO5 or TO6 containing Aluminophosphates are prepared using a cyclic amine or a diamine as the structure directing agent (template), and the Aluminophosphates with Al/P

  • mixed bonded open framework Aluminophosphates and related layered materials
    Topics in Catalysis, 1999
    Co-Authors: Jiesheng Chen, Wenqin Pang
    Abstract:

    The structural features, the synthesis and the role of templates in the synthesis for mixed-bonded open-framework Aluminophosphates and related layered materials will be reviewed in this article. These aluminophosphate materials differ from the (4,2)-connected Aluminophosphates and zeolites in that they contain TO5 and/or TO6 primary building units or terminal T-O bonds (T stands for Al or P). The extra ligands for the TO5 and TO6 units in the Aluminophosphates with framework Al/P = 1 are either bridging OH groups or H2O molecules in most cases whereas the terminal T-O bonds are either P-OH or P=O species with P=O bonds being prevalent in layered Aluminophosphates. Most of TO5 or TO6 containing Aluminophosphates are prepared using a cyclic amine or a diamine as the structure directing agent (template), and the Aluminophosphates with Al/P<1 or the layered materials tend to form from an alcoholic medium. Both synthetic conditions and templates play a critical role in determining the composition and structural feature of these materials.

  • Al16P20O80H4.4C6H18N2: A new microporous aluminophosphate containing intersecting 12- and 8-membered ring channels
    Chemistry of Materials, 1998
    Co-Authors: Kazumasa Sugiyama, Jiesheng Chen, Shilun Qiu, Kenji Hiraga, Osamu Terasaki, Shan Zheng, Yasuhiro Sakamoto, Mark E. Light
    Abstract:

    A new microporous aluminophosphate, designated AlPO-HDA, is prepared under solvothermal conditions using 1,6-hexanediamine as the template. AlPO-HDA is the first microporous aluminophosphate with A…

Kazuyuki Kuroda – One of the best experts on this subject based on the ideXlab platform.

  • synthesis and characterization of lamellar and hexagonal mesostructured Aluminophosphates using alkyltrimethylammonium cations as structure directing agents
    Chemistry of Materials, 1999
    Co-Authors: Tatsuo Kimura, Yoshiyuki Sugahara, Kazuyuki Kuroda
    Abstract:

    Lamellar and hexagonal mesostructured Aluminophosphates (AlPOs) were prepared and characterized. The lamellar mesostructured AlPO (APW-1) formed hydrothermally and the condensed framework was composed of alternating AlO4 and PO4 units. The hexagonal mesostructured AlPO (APW-2) is formed by transformation of a layered precipitate composed of both aluminophosphate oligomers and alkyltrimethylammonium (ATMA) cations. Calcined APW-2 had a mesoporosity with the BET surface area of 980 m2 g-1 and a pore diameter of 1.8 nm after substantial shrinkage of the framework. Lamellar APW-1 formed under most of the conditions surveyed, while hexagonal APW-2 was obtained under very restricted conditions. In this system, the charge matching in the products is the most important factor, although the assemblies of ATMA cations are essential as the structure-directing agents.

  • synthesis of mesoporous Aluminophosphates using surfactants with long alkyl chain lengths and triisopropylbenzene as a solubilizing agent
    Chemical Communications, 1998
    Co-Authors: Tatsuo Kimura, Yoshiyuki Sugahara, Kazuyuki Kuroda
    Abstract:

    Mesostructured organo-Aluminophosphates were prepared by using surfactants with long alkyl chain lengths (C16 and C22) and by utilizing solubilization of triisopropylbenzene; calcination of the mesostructured materials yielded thermally stable mesoporous Aluminophosphates with surface areas >700 m2 g–1 and with pore diameters in the range 1.8–3.9 nm.

  • Synthesis of mesoporous Aluminophosphates and their adsorption properties
    Microporous and Mesoporous Materials, 1998
    Co-Authors: Tatsuo Kimura, Yoshiyuki Sugahara, Kazuyuki Kuroda
    Abstract:

    Abstract Hexagonal mesostructured alkyltrimethylammonium–aluminophosphate materials were prepared by using hexadecyltrimethylammonium and dococyltrimethylammonium chlorides as surfactants and by utilizing 1,3,5-triisopropylbenzene as an auxiliary organic additive. Calcination of these materials at 600°C yielded thermally stable mesoporous aluminophosphate materials with large surface areas above 700 m2 g−1 and with pore diameters in the range from 1.8 to 3.9 nm. The hexagonal mesostructured materials before calcination had less condensed frameworks as determined by 31 P MAS NMR, which caused certain shrinkages during calcination for the formation of the porous structures. Water and benzene adsorption data indicated that the mesoporous aluminophosphate materials had comparatively hydrophilic mesopores.

Larry Kevan – One of the best experts on this subject based on the ideXlab platform.

  • Substitution of transition metal ions into Aluminophosphates and silicoAluminophosphates: characterization and relation to catalysis
    Research on Chemical Intermediates, 2002
    Co-Authors: Martin Hartmann, Larry Kevan
    Abstract:

    The literature related to the incorporation of transition metametal ions (TMI) into aluminophosphate (AlPO) and silicoaluminophosphate (SAPO) molecular sieves is reviewed. Microporous crystalline metal Aluminophosphates (MeAPOs) and metal silicoAluminophosphates (MeAPSOs) represent an important group of inorganic materials because of their high potential as adsorbents and catalysts. This review focuses mainly on the spectroscopic characterization of TMI containing MeAPOs and MeAPSOs covering the literature through 2000. The characterization of these materials is summarized and discussed in the light of possible isomorphous substitution of transition metametal ions into the aluminophosphate framework. Moreover, the literature devoted to the use of these materials in catalysis and adsorption is reviewed.

  • SYNTHESIS OF THERMALLY STABLE MESOPOROUS HEXAGONAL ALUMINOPHOSPHATE MOLECULAR SIEVES
    Chemical Communications, 1997
    Co-Authors: Dongyuan Zhao, Zhaohua Luan, Larry Kevan
    Abstract:

    Thermally stable mesoporous hexagonal Aluminophosphates (UHM-1) and silicoAluminophosphates (UHM-3) are synthesized based on ion-pair interactions of aluminophosphate species in the presence of tetramethylammonium hydroxide with a cationic surfactant [C 16 H 33 NMe 3 Cl].

  • A novel aluminophosphate precursor that transforms to AlPO4-5 molecular sieve at high temperature
    Chemical Communications, 1997
    Co-Authors: A. M. Prakash, Larry Kevan, Martin Hartmann
    Abstract:

    A novel aluminophosphate microporous compound, denoted UHM-5, synthesized from an aqueous aluminophosphate gel at 150 °C in the presence of cyclohexylamine as the template, transforms upon calcination above 300 °C into AlPO4-5 molecular sieve.