PPT Slide
- Consider the hydrogenation of ethylene:
C2H4(g) + H2(g) ? C2H6(g), ?H = -136 kJ/mol.
- When an H atom collides with an ethylene molecule on the surface, the C-C ? bond breaks and a C-H ? bond forms.
- When C2H6 forms it desorbs from the surface.
- When ethylene and hydrogen are adsorbed onto a surface, less energy is required to break the bonds and the activation energy for the reaction is lowered.