In general, decomposition of a gas (like ammonia) on a metal surface (like platinum) is a zero order reaction. This is because the gas is adsorbed on the metal surface due to pressure and the initial concentration is immaterial. But, why and HOW does it behave differently with quartz?

  • $\begingroup$ The metal surface has catalytic centres, quartz obviously hasn't? $\endgroup$ – Karl Nov 7 '17 at 1:49

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