We would like to thank the Engineering and Physical Sciences Research Council (EPSRC), University of St Andrews, and CRITICAT Centre for Doctoral Training for financial support [Ph.D. studentship to SR; Grant code: EP/L016419/1]. We also thank the EPSRC for funding part of this work through grant EP/K025112/1. R.E.M. would like to acknowledge OP VVV "Excellent Research Teams", project No. CZ.02.1.01/0.0/0.0/15_003/0000417 – CUCAM.The nitric oxide (NO) production for a series of aluminosilicate zeolites, prepared using the ADOR method, was investigated. Al-UTL and Al-IPC-2,-4 and −6 were prepared and characterised to determine their elemental composition. Positive trends were found to exist between zeolite pore size and the rate and total amount of NO produced. A trend between the number of acid sites and the initial rate of NO produced by the zeolite was also discovered.PostprintPeer reviewe