Poison

{
  "id": "MLC-T-CHM-009066",
  "term": "Poison",
  "field": "Chemistry",
  "definition": "A substance that reduces or completely deactivates the catalytic activity of a catalyst. This occurs by strong adsorption onto the active sites, blocking them from reacting with the substrate, or by chemically altering the catalyst surface. The effect of a poison can be reversible or irreversible, depending on the strength of its interaction with the catalyst.",
  "subject": "Physical and Biophysical Chemistry",
  "see_also": [
    "chemical bond",
    "recovery",
    "selectivity"
  ],
  "references": [
    "PAC, 1991, 63, 1227. 'Manual on catalyst characterization (Recommendations 1991)' on page 1244 (https://doi.org/10.1351/pac199163091227)"
  ],
  "url": "https://mlchart.com/terminology/chemistry/poison/"
}