Seite - 122 - in Advanced Chemical Kinetics

wasassumedconstantandthesurfacereactionsweremodelledaspseudo-monomolecularinthe testedmodel. The completemass balance, based on Figure 7, is represented by Eqs. (4)–(8). Themodel is pseudo-zero-orderoverall andcontains fiveparameters in total. dC1 dt ¼� r1þr3ð Þ¼�k1 (4) dC2 dt ¼ r1�r2¼ k2�k3 (5) dC3 dt ¼ r2¼ k3 (6) dC4 dt ¼ r3�r4¼ k4�k5 (7) dC5 dt ¼ r4¼ k5 (8) B A C Figure5. TEMimagesofAu/γ-Al2O3catalystspreparedbyvariousreducingagents: (A)reducedwith5%H2(~4nm); (B) reducedwith THPC (~17 nm); and (C) reducedwith PVA–citrate (~21 nm). Catalyst preparation detailswere outlined elsewhere [14]. Advanced Chemical Kinetics122