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Vrankić M, Šarić A, Bosnar S, Barišić D, Pajić D, Lützenkirchen-Hecht D, Badovinac IJ, Petravić M, Altomare A, Rizzi R, Klaser T. Structural Behavior and Spin-State Features of BaAl 2O 4 Scaled through Tuned Co 3+ Doping. Inorg Chem 2021; 60:8475-8488. [PMID: 34060812 DOI: 10.1021/acs.inorgchem.0c03475] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Pure and Co3+-doped BaAl2O4 [Ba(Al1-xCox)2O4, x = 0, 0.0077, 0.0379] powder samples were prepared by a facile hydrothermal route. Elemental analyses by static secondary ion mass spectrometry (SIMS), X-ray absorption spectroscopy (XAS) measurements at the Co K-edge, and X-ray diffraction studies were fully correlated, thus addressing a complete description of the structural complexity of Co3+-doped BaAl2O4 powder. Powder X-ray diffraction (PXRD) patterns indicated that prepared samples were nanocrystalline with a hexagonal P63 symmetry. The X-ray absorption near-edge structure (XANES) measurements revealed the presence of cobalt in a +3 oxidation state, while the rarely documented, tetrahedral symmetry around Co3+ was extracted from the extended X-ray absorption fine structure (EXAFS) oscillation patterns. Rietveld structure refinements showed that Co3+ preferentially substitutes Al3+ at tetrahedral Al3 sites of the BaAl2O4 host lattice, whereas the (Al3)O4 tetrahedra remain rather regular with Co3+-O distances ranging from 1.73(9) to 1.74(9) Å. The underlying magneto-structural features were unraveled through axial and rhombic zero-field splitting (ZFS) terms. The increased substitution of Al3+ by Co3+ at Al3 sites leads to an increase of the axial ZFS terms in Co3+-doped BaAl2O4 powder from 10.8 to 26.3 K, whereas the rhombic ZFS parameters across the series change in the range from 2.7 to 10.4 K, showing a considerable increase of anisotropy together with the values of the anisotropic g-tensor components flowing from 1.7 to 2.5. We defined the line between the Co3+ doping limit and influenced magneto-structural characteristics, thus enabling the design of strategy to control the ZFS terms' contributions to magnetic anisotropy within Co3+-doped BaAl2O4 powder.
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Affiliation(s)
- Martina Vrankić
- Division of Materials Physics and Center of Excellence for Advanced Materials and Sensing Devices, Ruđer Bošković Institute, Bijenička 54, 10000 Zagreb, Croatia
| | - Ankica Šarić
- Division of Materials Physics and Center of Excellence for Advanced Materials and Sensing Devices, Ruđer Bošković Institute, Bijenička 54, 10000 Zagreb, Croatia
| | - Sanja Bosnar
- Division of Materials Chemistry, Ruđer Bošković Institute, Bijenička 54, 10000 Zagreb, Croatia
| | - Dario Barišić
- Department of Physics, Faculty of Science, University of Zagreb, Bijenička 32, 10000 Zagreb, Croatia
| | - Damir Pajić
- Department of Physics, Faculty of Science, University of Zagreb, Bijenička 32, 10000 Zagreb, Croatia
| | | | - Ivana Jelovica Badovinac
- Department of Physics and Centre for Micro- and Nanosciences and Technologies, University of Rijeka, Radmile Matejčić 2, 51000 Rijeka, Croatia
| | - Mladen Petravić
- Department of Physics and Centre for Micro- and Nanosciences and Technologies, University of Rijeka, Radmile Matejčić 2, 51000 Rijeka, Croatia
| | - Angela Altomare
- Institute of Crystallography-CNR, via Amendola 122/o, 70126 Bari, Italy
| | - Rosanna Rizzi
- Institute of Crystallography-CNR, via Amendola 122/o, 70126 Bari, Italy
| | - Teodoro Klaser
- Department of Physics, Faculty of Science, University of Zagreb, Bijenička 32, 10000 Zagreb, Croatia
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2
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Souza JCP, Macedo LJA, Hassan A, Sedenho GC, Modenez IA, Crespilho FN. In Situ
and
Operando
Techniques for Investigating Electron Transfer in Biological Systems. ChemElectroChem 2020. [DOI: 10.1002/celc.202001327] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- João C. P. Souza
- São Carlos Institute of Chemistry University of São Paulo 13560-970 São Carlos São Paulo Brazil
- Campus Rio Verde Goiano Federal Institute of Education, Science and Technology 75901-970 Rio Verde Goiás Brazil
| | - Lucyano J. A. Macedo
- São Carlos Institute of Chemistry University of São Paulo 13560-970 São Carlos São Paulo Brazil
| | - Ayaz Hassan
- São Carlos Institute of Chemistry University of São Paulo 13560-970 São Carlos São Paulo Brazil
| | - Graziela C. Sedenho
- São Carlos Institute of Chemistry University of São Paulo 13560-970 São Carlos São Paulo Brazil
| | - Iago A. Modenez
- São Carlos Institute of Chemistry University of São Paulo 13560-970 São Carlos São Paulo Brazil
| | - Frank N. Crespilho
- São Carlos Institute of Chemistry University of São Paulo 13560-970 São Carlos São Paulo Brazil
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Potter ME, Armstrong LM, Carravetta M, Mezza TM, Raja R. Designing Multi-Dopant Species in Microporous Architectures to Probe Reaction Pathways in Solid-Acid Catalysis. Front Chem 2020; 8:171. [PMID: 32257997 PMCID: PMC7089933 DOI: 10.3389/fchem.2020.00171] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2019] [Accepted: 02/25/2020] [Indexed: 11/15/2022] Open
Abstract
The introduction of two distinct dopants in a microporous zeotype framework can lead to the formation of isolated, or complementary catalytically active sites. Careful selection of dopants and framework topology can facilitate enhancements in catalysts efficiency in a range of reaction pathways, leading to the use of sustainable precursors (bioethanol) for plastic production. In this work we describe our unique synthetic design procedure for creating a multi-dopant solid-acid catalyst (MgSiAPO-34), designed to improve and contrast with the performance of SiAPO-34 (mono-dopant analog), for the dehydration of ethanol to ethylene. We employ a range of characterization techniques to explore the influence of magnesium substitution, with specific attention to the acidity of the framework. Through a combined catalysis, kinetic analysis and computational fluid dynamics (CFD) study we explore the reaction pathway of the system, with emphasis on the improvements facilitated by the multi-dopant MgSiAPO-34 species. The experimental data supports the validation of the CFD results across a range of operating conditions; both of which supports our hypothesis that the presence of the multi-dopant solid acid centers enhances the catalytic performance. Furthermore, the development of a robust computational model, capable of exploring chemical catalytic flows within a reactor system, affords further avenues for enhancing reactor engineering and process optimisation, toward improved ethylene yields, under mild conditions.
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Affiliation(s)
- Matthew E Potter
- Faculty of Engineering and Physical Sciences, University of Southampton, Southampton, United Kingdom
| | - Lindsay-Marie Armstrong
- Faculty of Engineering and Physical Sciences, University of Southampton, Southampton, United Kingdom
| | - Marina Carravetta
- Faculty of Engineering and Physical Sciences, University of Southampton, Southampton, United Kingdom
| | - Thomas M Mezza
- UOP, A Honeywell Company, Des Plaines, IL, United States
| | - Robert Raja
- Faculty of Engineering and Physical Sciences, University of Southampton, Southampton, United Kingdom
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4
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Sheng P, Wang G, Dong M, Chen G, Yang H, Fan W, Qin Z, Wang J. Systematic study of the crystallization process of CrAPO-5 using in situ high resolution X-ray diffraction. RSC Adv 2017. [DOI: 10.1039/c6ra28572d] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Systematic study of the hydrothermal crystallization process of CrAPO-5 by in situ high resolution X-ray powder diffraction (HRXRD).
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Affiliation(s)
- Pei Sheng
- State Key Laboratory of Coal Conversion
- Institute of Coal Chemistry
- Chinese Academy of Sciences
- Taiyuan 030001
- China
| | - Guofu Wang
- State Key Laboratory of Coal Conversion
- Institute of Coal Chemistry
- Chinese Academy of Sciences
- Taiyuan 030001
- China
| | - Mei Dong
- State Key Laboratory of Coal Conversion
- Institute of Coal Chemistry
- Chinese Academy of Sciences
- Taiyuan 030001
- China
| | - Gang Chen
- State Key Laboratory of Coal Conversion
- Institute of Coal Chemistry
- Chinese Academy of Sciences
- Taiyuan 030001
- China
| | - Huanhuan Yang
- State Key Laboratory of Coal Conversion
- Institute of Coal Chemistry
- Chinese Academy of Sciences
- Taiyuan 030001
- China
| | - Weibin Fan
- State Key Laboratory of Coal Conversion
- Institute of Coal Chemistry
- Chinese Academy of Sciences
- Taiyuan 030001
- China
| | - Zhangfeng Qin
- State Key Laboratory of Coal Conversion
- Institute of Coal Chemistry
- Chinese Academy of Sciences
- Taiyuan 030001
- China
| | - Jianguo Wang
- State Key Laboratory of Coal Conversion
- Institute of Coal Chemistry
- Chinese Academy of Sciences
- Taiyuan 030001
- China
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Newland SH, Sinkler W, Mezza T, Bare SR, Raja R. Influence of dopant substitution mechanism on catalytic properties within hierarchical architectures. Proc Math Phys Eng Sci 2016; 472:20160095. [PMID: 27493563 DOI: 10.1098/rspa.2016.0095] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
A range of hierarchically porous (HP) AlPO-5 catalysts, with isomorphously substituted transition metal ions, have been synthesized using an organosilane as a soft template. By employing a range of structural and spectroscopic characterization protocols, the properties of the dopant-substituted species within the HP architectures have been carefully evaluated. The resulting nature of the active site is shown to have a direct impact on the ensuing catalytic properties in the liquid-phase Beckmann rearrangement of cyclic ketones.
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Affiliation(s)
| | | | - Thomas Mezza
- UOP LLC , a Honeywell Company , Des Plaines, IL 60017, USA
| | - Simon R Bare
- UOP LLC , a Honeywell Company , Des Plaines, IL 60017, USA
| | - Robert Raja
- School of Chemistry , University of Southampton , Southampton SO17 1BJ, UK
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Fu C, Li G, Luo D, Huang X, Zheng J, Li L. One-step calcination-free synthesis of multicomponent spinel assembled microspheres for high-performance anodes of li-ion batteries: a case study of MnCo(2)O(4). ACS APPLIED MATERIALS & INTERFACES 2014; 6:2439-49. [PMID: 24503188 DOI: 10.1021/am404862v] [Citation(s) in RCA: 60] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/07/2023]
Abstract
Multicomponent spinel metal-oxide assembled mesoporous microspheres, promising anode materials for Li-ion batteries with superior electrochemical performance, are usually obtained using different kinds of precursors followed by high-temperature post-treatments. Nevertheless, high-temperature calcinations often cause primary particles to aggregate and coarsen, which may damage the assembled microsphere architectures, leading to deterioration of electrochemical performance. In this work, binary spinel metal-oxide assembled mesoporous microspheres MnCo2O4 were fabricated by one-step low-temperature solvothermal method through handily utilizing the redox reaction of nitrate and ethanol. This preparation method is calcination-free, and the resulting MnCo2O4 microspheres were surprisingly assembled by nanoparticles and nanosheets. Two kinds of MnCo2O4 crystal nucleus with different exposed facet of (1̅10) and (11̅2̅) could be responsible for the formation of particle-assembled and sheet-assembled microspheres, respectively. Profiting from the self-assembly structure with mesoporous features, MnCo2O4 microspheres delivered a high reversible capacity up to 722 mAh/g after 25 cycles at a current density of 200 mA/g and capacities up to 553 and 320 mAh/g after 200 cycles at a higher current density of 400 and 900 mA/g, respectively. Even at an extremely high current density of 2700 mA/g, the electrode still delivered a capacity of 403 mAh/g after cycling with the stepwise increase of current densities. The preparation method reported herein may provide hints for obtaining various advanced multicomponent spinel metal-oxide assembled microspheres such as CoMn2O4, ZnMn2O4, ZnCo2O4, and so on, for high-performance energy storage and conversion devices.
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Affiliation(s)
- Chaochao Fu
- Key Lab of Optoelectronic Materials Chemistry and Physics, Fujian Institute of Research on the Structure of Matter, University of Chinese Academy of Sciences , Fuzhou 350002, P. R. China
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Bonelli B, Armandi M, Hernandez S, Vankova S, Celasco E, Tomatis M, Saracco G, Garrone E. The behaviour of an old catalyst revisited in a wet environment: Co ions in APO-5 split water under mild conditions. Phys Chem Chem Phys 2014; 16:7074-82. [DOI: 10.1039/c4cp00320a] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Co-APO-5 splits water at room temperature through the endothermic process shown in the figure.
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Affiliation(s)
- Barbara Bonelli
- Department of Applied Science and Technology and INSTM Unit of Torino-Politecnico
- Corso Duca degli Abruzzi
- I-10129 Turin, Italy
| | - Marco Armandi
- Department of Applied Science and Technology and INSTM Unit of Torino-Politecnico
- Corso Duca degli Abruzzi
- I-10129 Turin, Italy
- Center for Space Human Robotics
- IIT@Polito
| | - Simelys Hernandez
- Center for Space Human Robotics
- IIT@Polito
- Istituto Italiano di Tecnologia
- I-10129 Turin, Italy
| | - Svetoslava Vankova
- Department of Applied Science and Technology and INSTM Unit of Torino-Politecnico
- Corso Duca degli Abruzzi
- I-10129 Turin, Italy
| | - Edvige Celasco
- Department of Applied Science and Technology and INSTM Unit of Torino-Politecnico
- Corso Duca degli Abruzzi
- I-10129 Turin, Italy
- Department of Physics
- Università di Genova
| | - Maura Tomatis
- Department of Chemistry and “G. Scansetti” Interdepartmental Centre for Studies on Asbestos and other Toxic Particulates
- Università degli Studi di Torino
- Torino I-10125, Italy
| | - Guido Saracco
- Department of Applied Science and Technology and INSTM Unit of Torino-Politecnico
- Corso Duca degli Abruzzi
- I-10129 Turin, Italy
| | - Edoardo Garrone
- Department of Applied Science and Technology and INSTM Unit of Torino-Politecnico
- Corso Duca degli Abruzzi
- I-10129 Turin, Italy
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Martis M, Smith AJ, Tang C, Parker JE, Hyde TI, Watson MJ, Baucherel X, Kohara S, Wakihara T, Sankar G. Tracking the structural changes in pure and heteroatom substituted aluminophosphate, AIPO-18, using synchrotron based X-ray diffraction techniques. Phys Chem Chem Phys 2013; 15:11766-74. [PMID: 23752302 DOI: 10.1039/c3cp00015j] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We report the structural changes that occur during the thermal removal of organic template molecules that occlude the pores of small pore nanoporous zeolitic solids, AlPO-18, SAPO-18, CoAlPO-18, ZnAlPO-18 and CoSAPO-18. The calcination process is a necessary step in the formation of active catalysts. The studies performed using time-resolved High Resolution Powder Diffraction (HRPD) and High Energy X-ray Diffraction (HEXRD) techniques at various temperatures reveal that changes that take place are dependent on the type of heteroatom present in the nanoporous solids. While time-resolved HRPD shows clear changes in lattice parameters during the removal of physisorbed water molecules and subsequent removal of the organic template, HEXRD data show changes in various near neighbour distances in AlPO-18, SAPO-18, CoAlPO-18, CoSAPO-18 and ZnAlPO-18 during the calcination process. In particular HEXRD reveals the presence of water molecules coordinated to Al(III) ions in the as-synthesised materials. Upon removal of the template and water, these solids show contraction in the cell volume at elevated temperatures while first and second neighbour distances remained almost unchanged.
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Affiliation(s)
- Martin Martis
- University College London, Department of Chemistry, 20 Gordon Street, London, WC1H 0AJ, UK
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Bakhmutov VI. Strategies for solid-state NMR studies of materials: from diamagnetic to paramagnetic porous solids. Chem Rev 2010; 111:530-62. [PMID: 20843066 DOI: 10.1021/cr100144r] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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10
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Chmaissem O, Zheng H, Huq A, Stephens P, Mitchell J. Formation of Co3+ octahedra and tetrahedra in YBaCo4O8.1. J SOLID STATE CHEM 2008. [DOI: 10.1016/j.jssc.2007.12.016] [Citation(s) in RCA: 87] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Bakhmutov VI, Shpeizer BG, Clearfield A. Structure of a paramagnetic supermicroporous silica-based material via a multinuclear solid-state NMR monitoring. MAGNETIC RESONANCE IN CHEMISTRY : MRC 2007; 45:118-22. [PMID: 17120259 DOI: 10.1002/mrc.1927] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
The paramagnetic Si/Al material doped with 19.8% (weight) of Mn2+ has been characterized by the 1H, 13C, 27Al, 29Si MAS NMR spectra and the 1H, 29Si T1MAS relaxation measurements as a gel dried at 130 degrees C and as samples calcined at 504, 540 and 650 degrees C. It has been demonstrated that in spite of strong paramagnetic effects, NMR monitoring in combination with 29Si T1 relaxation experiments can be successful for structural descriptions of porous materials.
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Affiliation(s)
- Vladimir I Bakhmutov
- Department of Chemistry, Texas A & M University, P.O. Box 30012, College Station, Texas 77842-3012, USA.
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Bakhmutov VI, Shpeizer BG, Clearfield A. Solid-state NMR spectra of paramagnetic silica-based materials: observation of 29Si and 27Al nuclei in the first coordination spheres of manganese ions. MAGNETIC RESONANCE IN CHEMISTRY : MRC 2006; 44:861-7. [PMID: 16791874 DOI: 10.1002/mrc.1866] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
Some silica-based solids, prepared by the sol/gel method in the presence of high Mn2+ concentrations, have been characterized by the 29Si, 27Al MAS NMR spectra and 29Si T1 measurements. The single-pulse 29Si and 27Al MAS NMR spectra have shown broad spinning sideband patterns that are interpreted in terms of anisotropic bulky magnetic susceptibility (BMS) and dipole-field effects. In the absence of paramagnetic isotropic shifts, the 29Si and 27Al nuclei observed in the single-pulse NMR spectra have been assigned to nuclei remote from paramagnetic centers. It has been demonstrated that the 29Si and 27Al nuclei, which are in the vicinity of the manganese ions, can be detected by the Hahn-echo MAS NMR experiments at different carrier frequencies.
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Affiliation(s)
- Vladimir I Bakhmutov
- Department of Chemistry, Texas A&M University, P.O. Box 30012, College Station, Texas 77842-3012, USA
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Grandjean D, Beale AM, Petukhov AV, Weckhuysen BM. Unraveling the Crystallization Mechanism of CoAPO-5 Molecular Sieves under Hydrothermal Conditions. J Am Chem Soc 2005; 127:14454-65. [PMID: 16218641 DOI: 10.1021/ja054014m] [Citation(s) in RCA: 115] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The hydrothermal crystallization of CoAPO-5 molecular sieves has been studied using time-resolved in-situ SAXS/WAXS, UV-vis, Raman, and XAS. Data collected during heating to 180 degrees C allowed the observation of different steps occurring during the transformation of the amorphous gel into a crystalline material from a macroscopic and atomic perspective. Raman spectroscopy detected the initial formation of Al-O-P bonds, whereas SAXS showed that these gel particles had a broad size distribution ranging from ca. 7 to 20 nm before crystallization began. WAXS showed that this crystallization was sharp and occurred at around 160 degrees C. Analysis of the crystallization kinetics suggested a one-dimensional growth process. XAS showed that Co(2+) transformed via a two-stage process during heating involving (i) a gradual transformation of octahedral coordination into tetrahedral coordination before the appearance of Bragg peaks corresponding to AFI, suggesting progressive incorporation of Co(2+) into the poorly ordered Al-O-P network up to ca. 150 degrees C, and (ii) a rapid transformation of remaining octahedral Co(2+) at the onset of crystallization. Co(2+) was observed to retard crystallization of AFI but provided valuable information regarding the synthesis process by acting as an internal probe. A three-stage, one-dimensional crystallization mechanism is proposed: (i) an initial reaction between aluminum and phosphate units forming a primary amorphous phase, (ii) progressive condensation of linear Al-O-P chains forming a poorly ordered structure separated by template molecules up to ca. 155 degrees C, and (iii) rapid internal reorganization of the aluminophosphate network leading to crystallization of the AFI crystal structure.
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Affiliation(s)
- Didier Grandjean
- Department of Inorganic Chemistry and Catalysis, Debye Institute, Utrecht University, Sorbonnelaan 16, 3584 CA Utrecht, The Netherlands
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