In this paper, we consider the necessity for a transition from the currently widespread, mainly cylindrical basic shape of catalysts for natural gas reforming reactors to a spherical shape. It is shown theoretically, experimentally, and, finally, using data of practical industrial natural gas reforming, that spherical catalyst granules are conducive to a considerable reduction in the pressure drop across a tube furnace, without compromising performance. Their use can also permit an increase in tube furnace output without extensive revamping. (C) 2011 Elsevier B.V. All rights reserved.