Catalysts and Altering Octane Numbers 0.0 / 5 ? ChemistrycatalystsOctane numbersASOCR Created by: EveKidneyCreated on: 02-01-15 17:20 What is a catalyst? A catalyst speeds up a chemical reaction without being used up or changed 1 of 12 The catalyst reduces the what? Activation Energy (by offering a different pathway or mechanism) 2 of 12 What i a Heterogeneous catalyst? Heterogeneous Catalysts are in a different physical state to the reactants 3 of 12 What does cracking produce? Short chain Alkanes and Alkenes 4 of 12 What happens in reforming? Alkanes are converted to Cycloalkanes and Hydrogen, Cycloalkanes are then converted to Arenes and Hydrogen 5 of 12 What catalyst is used in reforming? Platinum Catalyst 6 of 12 What are the Products like in Isomerisation? The product is shorter and more branched than the reactant 7 of 12 In Isomerisation the longest carbon chain becomes shorter, so what happens to the Octane Number? It increases 8 of 12 There is more branching, so what happens to the Octane Number? It increases 9 of 12 What 2 things helps isomerisation take place? Platinum Catalyst and Zeolite Sieve 10 of 12 What happens When a catalyst is poisoned? A catalyst Poison ADSORBS onto the catalyst surface and stops it working 11 of 12 Does the Catalyst poison ADSORB stronger or weaker than the reactants? The poison ADSORBS more STRONGLY than the reactants 12 of 12
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