Role of reactive-surface-area

Luttge, A., Bolton, E. W. Lasaga, A. C. 1999. An interferometric study of the dissolution kinetics of anorthite The role of reactive surface area. American Journal of Science, 299, 652-678. 

White A. F. and Peterson M. L. (1990) Role of reactive-surface-area characterization in geochemical kinetic models. In Chemical Modelling of Aqueous Systems II (eds. D. C. Melchior and R. L. Bassett). American Chemical Society, Washington, DC, vol. 416, pp. 461-475. 

Role of Reactive-Surface-Area Characterization in Geochemical Kinetic Models... 

Watson EB, Cherniak DJ (1997) Oxygen diffusion in zircon. Earth Planet Sci Lett 148 527-544 Wendlandt RW (1991) Oxygen diffusion in basalt and andesite melts Experimental results and discussion of chemical versus tracer diffusion. Contrib Mineral Petrol 108 463-471 West AR (1984) Solid State Chemistry and Its Applications. John Wiley and Sons, New York Whipple RTP (1954) Concentration contours in grain boundary diffusion. Phil Mag 45 1225-1236 White AF, Peterson MI (1990) Role of reactive-surface area characterization in geochemical kinetic models. In Melchior DC, Bassett RL (eds) Chemical Modeling of Aqueous Systems. II. Am Chem Soc Symp 416 461-475... 

White AF, Peterson ML (1990) Role of reactive-surface area characterization in geochemical knietic models. In Melchior DC, Bassett RL (eds) Chemical modeling of aqueous systems II. Am Chem Soc Symp Ser 416, Washington DC, pp 461-477... 

As well as playing the normal role of a support in keeping catalytically active particles apart on the active surface (to preserve the available reactive surface area), titanium dioxide also has several important direct roles in catalysis. Three such examples are presented. 

Coke formation on these catalysts occurs mainly via methane decomposition. Deactivation as a function of coke content (see Fig. 3 for Pt/ y-AljO,) seems to involve two processes, i e, a slow initial one caused by coke formed from methane on Pt that is non reactive towards CO2 (see Table 3) In parallel, carbon also accumulates on the support and given the ratio between the support surface and metal surface area at a certain level begins to physically block Pt deactivating the catalyst rapidly. The coke deposited on the support very close to the Pt- support interface could be playing an important role in this process. 

---