Study of the thermal transformations of Co- and Fe-exchanged zeolites A and X by “in situ” XRD under reducing atmosphere
Source abstract
Abstract
Abstract “In situ” high temperature X-ray diffraction under reducing atmosphere is used for the first time to study the thermal stability and transformations of Co- and Fe-exchanged A and X zeolites. TG-DTA and “ex situ” XRD characterization were also carried out. The temperature of incipient crystallization of metallic phase was found to be 700 °C in Fe-zeolites and 800 °C in Co-zeolites. Moreover, ex situ X-ray experiments, after thermal treatment both under inert and reducing atmosphere, revealed the formation of ceramic phases upon the thermal collapse of the zeolitic framework. Metal nanoparticles were obtained by reduction and the size of metal clusters was found to range between 24 and 40 nm.
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Research context
OpenAlex topics: Zeolite Catalysis and Synthesis · Thermal and Kinetic Analysis · Catalysis and Oxidation Reactions
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (33)
Show source-provided references
1. Subramanian · Mater. Res. Bull. · 1986 · 21 · 152510.1016/0025-5408(86)90094-2 ↗
2. U.V. Chowdry, D.R. Corbin, M.A. Subramanian, Anorthite-Cordierite Based Ceramics from Zeolites, US Patent 4,813,303, 1-14, 21 March, 1989.
3. Subramanian · Adv. Ceram. · 1989 · 26 · 239
4. Corbin · Mater. Res. Soc. Symp. Proc. · 1991 · 233 · 21310.1557/PROC-233-213 ↗
5. Breck · 1974
6. Dell’Agli · Solid State Ionics · 2000 · 127 · 30910.1016/S0167-2738(99)00298-2 ↗
7. Ferone · Chem. Mater. · 2002 · 14 · 79710.1021/cm0111938 ↗
8. Aronne · J. Mater. Chem. · 2002 · 12 · 303910.1039/b203859e ↗
9. Esposito · J. Eur. Ceram. Soc. · 2004 · 24 · 268910.1016/j.jeurceramsoc.2003.09.017 ↗
10. Clayden · J. Mat. Chem · 2003 · 13 · 168110.1039/b212717b ↗
11. Ferone · 2005 · vol. 155
12. Ferone · Solid State Sci. · 2005 · 7 · 140610.1016/j.solidstatesciences.2005.07.001 ↗
13. Clayden · J. Solid State Chem. · 2006 · 179 · 195710.1016/j.jssc.2006.03.021 ↗
14. Andreola · Ceram. Int. · 2008 · 34 · 54310.1016/j.ceramint.2006.12.010 ↗
15. Chen · J. Non-Cryst. Solids · 1991 · 130 · 32210.1016/0022-3093(91)90370-L ↗
16. Talmy · 1992 · p.687
17. Colyer · Stud. Surf. Sci. Catal. · 1994 · 84A · 38710.1016/S0167-2991(08)64137-3 ↗
18. Colyer · Nucl. Instr. Methods Phys. Res. · 1995 · B97 · 10710.1016/0168-583X(94)00413-7 ↗
19. Schmidt · Micropor. Mesopor. Mater. · 2001 · 48 · 8910.1016/S1387-1811(01)00362-6 ↗
20. Schmidt · Chem. Mater. · 2001 · 13 · 60710.1021/cm001138j ↗
21. Mazza · J. Eur. Ceram. Soc. · 2000 · 20 · 69910.1016/S0955-2219(99)00196-X ↗
22. Cruciani · J. Phys. Chem. Solids · 2006 · 67 · 197310.1016/j.jpcs.2006.05.057 ↗
23. Weidenthaler · Chem. Mater. · 2000 · 12 · 381110.1021/cm0011312 ↗
24. Schmidt · Stud. Surf. Sci. Catal. · 2001 · 135 · 1569
25. Trigueiro · J. Alloys Compd. · 2002 · 344 · 33710.1016/S0925-8388(02)00381-X ↗
26. X’Pert High Score Plus 2.2a version, PANalytical B.V. Almelo, The Netherlands.
27. Chandrasekhar · Ceram. Int. · 2001 · 27 · 10510.1016/S0272-8842(00)00049-3 ↗
28. Chandrasekhar · Ceram. Int. · 2002 · 28 · 17710.1016/S0272-8842(01)00075-X ↗
29. Beale · Physica Scripta · 2005 · T115 · 67810.1238/Physica.Topical.115a00678 ↗
30. Beale · Chem. Mater. · 2006 · 18 · 26310.1021/cm050797z ↗
31. Lodge · Polyhedron · 2006 · 25 · 56810.1016/j.poly.2005.08.041 ↗
32. Afzal · J. Therm. Anal. Calorimet. · 2000 · 62 · 27710.1023/A:1010143602283 ↗
33. Baerlocher · 2001