Catalyst ageing

{
  "id": "MLC-T-CHM-001706",
  "term": "Catalyst ageing",
  "field": "Chemistry",
  "definition": "A loss of activity caused by alteration of the catalyst's own structure or texture, such as sintering of metal crystallites, collapse of pores or a phase change in the support. Such changes are irreversible in most cases, so activity cannot be restored by regeneration, in contrast to deactivation by coke deposition, which is removed by burning.",
  "subject": "Physical and Biophysical Chemistry",
  "see_also": [
    "catalyst decay",
    "catalyst"
  ],
  "references": [
    "PAC, 1976, 46, 71. 'Manual of Symbols and Terminology for Physicochemical Quantities and Units - Appendix II. Definitions, Terminology and Symbols in Colloid and Surface Chemistry. Part II: Heterogeneous Catalysis' on page 84 (https://doi.org/10.1351/pac197646010071)"
  ],
  "url": "https://mlchart.com/terminology/chemistry/catalyst-ageing/"
}