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Professor Lesley Yellowlees

Explore the concept of catalysts in chemistry and society, highlighting examples of chemical catalysts and the role of community catalysts in driving positive change. Discover how catalysts can be reused, the importance of finding the right catalyst, and the value they bring to reactions and communities.

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Professor Lesley Yellowlees

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  1. Professor Lesley Yellowlees The Queen’s Nursing Institute Scotland

  2. Catalyst: What is it? • A catalyst is a substance that speeds up a chemical reaction, but is not consumed by the reaction; hence a catalyst can be recovered chemically unchanged at the end of the reaction it has been used to speed up, or catalyze.

  3. Examples of Chemical Catalysts Heterogeneous Catalysis Haber Process: N2 (gas) + 3H2 (gas) ⇌ 2NH3 (gas) Catalyst: Iron Fe Catalyst: Pt

  4. Examples of Chemical Catalysts Homogeneous Catalysis Ziegler-Natta – formation of plastics

  5. Example of Biology Catalyst: Enzyme

  6. Demonstration Elephants Toothpaste Reactant (starting material): hydrogen peroxide H2O2 Products (final materials): water (H2O) and oxygen (O2) Catalyst: potassium iodide (KI) Overall reaction: 2H2O2 → 2H2O + O2

  7. Catalysts: never used up during a reaction can be reused many, many times for the same reaction are different for different reactions

  8. Catalysts – Agents for change • Govan Men’s Shed • Mature Walks for Wellbeing • Breast-feeding and early nutrition • Supportive Self-Management • Tweeddale informal carers’ well-being • The Three Bridges • Get moving!

  9. Agent for Change Early 1990’s : Outreach

  10. Agent for Change 2004 : Athena Swan

  11. Agent for Change 2007: Head of Chemistry

  12. Agent for Change 2011 : Vice Principal and Head of the College of Science and Engineering

  13. Agent for Change 2012 : President of the Royal Society of Chemistry

  14. Demonstration Reactants (starting materials): Hydrogen (H2) and Oxygen (O2) Product (final material): water (H2O) Catalyst: Carbon Black (Pd on C) Overall reaction: 2H2 + O2 → 2H2O

  15. Chemical Catalysts • Need to find right catalyst for reaction • Catalysts are expensive egPd, Pt • Catalysts often need support • Catalysts need looking after – easily ‘poisoned’ • Catalysts are valuable • ………….Community Catalysts

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