Fecha registrada: April 19 2018

Duration: 44 minutes 30 seconds

We present a variety of X-ray techniques for a structural characterization of catalysts on the example of automotive three-way catalysts at ambient and non-ambient conditions.

X-ray techniques, such as X-ray diffraction (XRD) and fluorescence (XRF) small-angle X-ray scattering (SAXS) and X-ray scattering in combination with pair distribution function (PDF) analysis are often traditionally assigned to large- scale facilities, like synchrotrons and spallation neutron sources.

We demonstrate, however, that these methods can be combined on laboratory instruments (most of which even on one single XRD platform).

As a model system we present supported PdO nanoparticles on reducible oxides such as Co3O4 and γ-Fe2O3. Parameters and characteristics that can be extracted from the X-ray experiments are:

  • Elemental composition
  • Qualitive and quantitative phase composition
  • Phase behavior and stability (in- situ heating and cooling experiments)
  • Crystallite size and structure
  • Particle size and shape, size distribution, specific surface area
  • Short- and long- range atomic ordering
Table of contents
1. X-ray characterization of catalysts
01:05
2. Poll
00:00
3. X-ray characterization of catalysts
01:23
4. Poll Answers
00:00
5. Collaboration project
01:40
6. About Malvern Panalytical
01:09
7. Untitled
00:16
8. X-ray technologies
00:40
9. Institute of Materials Chemistry
00:48
10. Supported catalyst materials
00:38
11. Supported catalyst materials
00:31
12. Supported catalyst materials
00:34
13. Case study
01:27
14. Preparation of catalysts
00:58
15. Nano-catalysts
01:01
16. What is of interest?
00:37
17. XRPD: Can we do more?
01:12
18. Thermal stability
00:20
19. Phase identification & quantification
01:23
20. In situ heating
00:58
21. In situ heating
00:25
22. In situ heating
00:44
23. In situ heating
00:27
24. In situ heating
00:06
25. In situ heating
00:50
26. Can we do more?
00:14
27. Which particles to analyze and how?
00:58
28. Particle size analysis
00:34
29. What is Small-angle X-ray scattering (SAXS)?
01:13
30. Particle size analysis: SAXS
00:36
31. Particle size analysis
00:05
32. Non-ambient SAXS
01:04
33. Further characterization of PdO species
00:38
34. Total scattering
00:05
35. What is the PDF?
00:33
36. What is the PDF?
00:50
37. PDF measurements: GaliPIX3D
00:52
38. PDF measurements
01:12
39. PDF: where is PdO?
00:40
40. Taking the difference…
00:46
41. Taking the difference…
00:21
42. Taking the difference…
00:48
43. … comparing with the literature
00:58
44. Summary
00:11
45. Summary
00:57
46. Thank you for your attention!Questions?
00:18
47. Question & Answer SessionUse the Q & A icon and type your question.If listening on demand send your questions to Ask@panalytical.comThank you for attending
01:59
48. What is Small-angle X-ray scattering (SAXS)?
00:05
49. In situ heating
00:43
50. In situ heating
00:15
51. Question & Answer SessionUse the Q & A icon and type your question.If listening on demand send your questions to Ask@panalytical.comThank you for attending
00:25
52. What is Small-angle X-ray scattering (SAXS)?
00:34
53. Which particles to analyze and how?
00:38
54. Question & Answer SessionUse the Q & A icon and type your question.If listening on demand send your questions to Ask@panalytical.comThank you for attending
00:22
55. PDF measurements
01:30
56. Question & Answer SessionUse the Q & A icon and type your question.If listening on demand send your questions to Ask@panalytical.comThank you for attending
00:31
57. Phase identification & quantification
03:22
58. Question & Answer SessionUse the Q & A icon and type your question.If listening on demand send your questions to Ask@panalytical.comThank you for attending
01:01