A chemical kinetic method based on the kinetic expression of the second-order reaction on fractals is used to determine the spectral dimension of tractal dimension of fractal surfaces. The method can convemently give ...A chemical kinetic method based on the kinetic expression of the second-order reaction on fractals is used to determine the spectral dimension of tractal dimension of fractal surfaces. The method can convemently give the spectral dimension by analyzing the relation between reactant concentration and reaction time (ct～t). The spectral dimension of the Diffusion-Limited Aggregate (DLA) is obtanined by Monte Carlo simulation of the desorption process of chemisorbed hydrogen from DLA, and it is in agreement, with that in literature. Also, the spectral dimension of a real catalyst12% Ni/Al2O3 is obtained by the method.展开更多
Using Monte Carlo (MC) method, we sinuilate two possible mechanisms of N2O decomPosition reaction on a catalyst. One of them is in good agreement with the experiment. On the other hand, we also investigate the nature ...Using Monte Carlo (MC) method, we sinuilate two possible mechanisms of N2O decomPosition reaction on a catalyst. One of them is in good agreement with the experiment. On the other hand, we also investigate the nature of the reaction rate oscillation in N2O decomposition. The results show that besides simulating mechahisms of surface reactions, MC method can also be an effective tool to investigate the kinetic behavior of complex reactions.展开更多
The kinetics of the decomposition of N2O on a catalytic surface is simulatedby means of the Monte Carlo technique. The results show that the reaction rate is dependent not only to the mole fraction of N2O in gas phase...The kinetics of the decomposition of N2O on a catalytic surface is simulatedby means of the Monte Carlo technique. The results show that the reaction rate is dependent not only to the mole fraction of N2O in gas phase, but also to the surface-O coverage.The surface-O coverage increases with the increasing of the mole fraction of N2O in gas.When the reaction gas is pure N2O, the surface-O coverage can be a constant, and it isindependent to the pressuze of N2O gas.展开更多
The decomposition of N2O on a catalytic surface was simulated by the Monte Carlo method. The results show that both reaction rate and surface coverage oscillate with time. Fractal analysis of the time-series of surfac...The decomposition of N2O on a catalytic surface was simulated by the Monte Carlo method. The results show that both reaction rate and surface coverage oscillate with time. Fractal analysis of the time-series of surface coverages indicates that the oscillation observed has an attractor. The oscillation is chaotic in nature and the attractor is a fractal with a dimension about 3.5 when the rate constant k2 of the elementary step which produces O2 is large enough.展开更多
文摘A chemical kinetic method based on the kinetic expression of the second-order reaction on fractals is used to determine the spectral dimension of tractal dimension of fractal surfaces. The method can convemently give the spectral dimension by analyzing the relation between reactant concentration and reaction time (ct～t). The spectral dimension of the Diffusion-Limited Aggregate (DLA) is obtanined by Monte Carlo simulation of the desorption process of chemisorbed hydrogen from DLA, and it is in agreement, with that in literature. Also, the spectral dimension of a real catalyst12% Ni/Al2O3 is obtained by the method.
文摘Using Monte Carlo (MC) method, we sinuilate two possible mechanisms of N2O decomPosition reaction on a catalyst. One of them is in good agreement with the experiment. On the other hand, we also investigate the nature of the reaction rate oscillation in N2O decomposition. The results show that besides simulating mechahisms of surface reactions, MC method can also be an effective tool to investigate the kinetic behavior of complex reactions.
文摘The kinetics of the decomposition of N2O on a catalytic surface is simulatedby means of the Monte Carlo technique. The results show that the reaction rate is dependent not only to the mole fraction of N2O in gas phase, but also to the surface-O coverage.The surface-O coverage increases with the increasing of the mole fraction of N2O in gas.When the reaction gas is pure N2O, the surface-O coverage can be a constant, and it isindependent to the pressuze of N2O gas.
文摘The decomposition of N2O on a catalytic surface was simulated by the Monte Carlo method. The results show that both reaction rate and surface coverage oscillate with time. Fractal analysis of the time-series of surface coverages indicates that the oscillation observed has an attractor. The oscillation is chaotic in nature and the attractor is a fractal with a dimension about 3.5 when the rate constant k2 of the elementary step which produces O2 is large enough.
