specific catalyst examples

• State 4 examples of the use of transition metals as heterogenous catalysts.

  1. V2O5 in the Contact process (manufacture of SO3 for H2SO4)
  2. Fe in the Haber process (manufacture of NH3 used as pea sized lumps)
  3. Rd/Pt/Pd in catalytic converters
  4. Cr2O3 in the manufacture of synthesis gas
• Which substance poisons the Pt/Rd catalyst in a catalytic converter?

  Lead impurities
• Write the equation involved in the Haber process

  N2(g) + 3H2(g) ⇌ 2NH3(g)
• Which substance poisons the iron catalyst in the Haber process?

  Sulfur compounds
• Write the equations involving V2O5 in the Contact process

  SO2 + V2O5 --> SO3 +V2O4 V2o4 + 1/2 O2 -> V2O5
• V2O4 + ½ O2

  ->V2O5
• suggest why this reaction requires a catalyst

  $\text{S}_2\text{O}_8^{\ 2-}\text{ (aq)}+$$2\text{I}^-\text{ (aq)}\to 2\text{SO}_4^{\ 2-}\text{ (aq)}+$$\text{I}_2\text{ (aq)}$


  both reactants have like charges so they repel
• name a heterogeneous catalyst and the process that it is used in

  iron the harber process
• what type of catalyst is used in the contact process and name it


  vanadium (IV) oxide (V2O5) and heterogenous catalyst