Flytzani-Stephanopoulos

W. Deng, J. De Jesus, H. Saltsburg, M. Flytzani-Stephanopoulos, Appl. Catal. A Gen. 291 P005) 126. 

Fu Q, Deng W, Saltsburg H, Flytzani-Stephanopoulos M (2005) Activity and stability of low-content gold-cerium oxide catalysts for the water-gas shift reaction. Appl Catal B 56 57-68... 

P. Ciambelli, D. Sannino, M.C. Gaudino, M. Flytzani-Stephanopoulos, Stud. Surf. Sci. Catal., 142B, (2002) 1031... 

Flytzani-Stephanopoulos, M., X. Qi, and S. Kronewitter, Water-Gas Shift with Integrated Hydrogen Separation Process, Final Report, U.S. DOE Contract DE-FG2600-NT-40819, February 2004. 

Li, Y., Fu, Q., and Flytzani-Stephanopoulos, M. 2000. Low-temperature water-gas shift reaction over Cu- and Ni-loaded cerium oxide catalysts. Appl. Catal. B Environ. 27 179-91. 

The N20 decomposition, CO oxidation, and H2 oxidation reactions are known to exhibit concentration oscillations over noble metal catalysts. Flytzani-Stephanopoulos et al. (47) have observed oscillations for the oxidation of NH3 over Pt. The effects are dramatic and lead to large temperature cycles for the catalyst wire. Heat and mass transfer effects are important. 

Flytzani-Stephanopoulos and coworkers—urea method for preparing high surface area ceria/substituting noble metals with base metals/cationic active sites for Au and Pt-ceria catalysts/deactivation by hydroxycarbonates and improved stability with 02 co-feeding. Li et al.396 reported on low temperature water-gas shift catalysts in their search for a replacement catalyst for Cu/ZnO suitable for use in a fuel... 

W. Liu, and M. Flytzani-Stephanopoulos, Transition metal-promoted oxidation catalysis by fluorite oxides A study of CO oxidation over Cu—Ce02, Chem. Eng. J. 64, 283—294 (1996). 

She, X. and Flytzani-Stephanopoulos, M. Mechanistic differences in the selective reduction of NO by propene over cobalt- and silver-promoted alumina catalysts kinetic and in situ DRIFTS study, Catal. Today, 2000,Volume 59, Issues 3-4, 287-304. 

In order to improve the resistance of Ni/Al203-based catalysts to sintering and coke formation, some workers have proposed the use of cerium compounds [36]. Ceria, a stable fluorite-type oxide, has been studied for various reactions due to its redox properties [37]. Zhu and Flytzani-Stephanopoulos [38] studied Ni/ceria catalysts for the POX of methane, finding that the presence of ceria, coupled with a high nickel dispersion, allows more stability and resistance to coke deposition. The synergistic effect of the highly dispersed nickel/ceria system is attributed to the facile transfer of oxygen from ceria to the nickel interface with oxidation of any carbon species produced from methane dissociation on nickel. 

Figure 9 Carbon formation on two commercial Ni-based catalysts in the ATR of n-Cj4 open symbols—carbon free closed symbols—carbon formation (Reprinted from Flytzani-Stephanopoulos and Voecksf copyright (1983), with permission from Elsevier)...

It is interesting to consider the shapes of the subharmonic trajectories that lock on the torus in the various entrainment regions of order p/q. The subharmonic period 4 at the 4/3 resonance horn is, for example, a three-peaked oscillation in time [Fig. 7(a)] and has three closed loops in its phase-plane projection [Fig. 7(b)], while the subharmonic period 4 at the 4/ 1 resonance is a single-peaked, single-loop oscillation [Figs. 7(d) and 7(e)]. A subharmonic period 2 at the 2/3 resonance is also included in Figs. 7(g) and 7(h). Multipeaked oscillations observed in chemical systems (Scheintuch and Schmitz, 1977 Flytzani-Stephanopoulos et al., 1980) may thus result from the interaction of frequencies of local oscillators. Such trajectories are the nonlin-... 

Early studies of the etching of a number of metals, particularly silver, copper, platinum, and tungsten, have been thoroughly reviewed by Shuttleworth in 1948 (7), Moore in 1963 (2), and Flytzani-Stephanopoulos and Schmidt in 1979 (2). Little of the early work is repeated here rather, the goal of the following review is to focus on the significant contributions and clarify fundamental concepts. 

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