Taking Au3Cu-type sublattice system as an example, three discoveries have been presented. First, the fourth barrier to hinder the progress of metal materials science is that today’s researchers do not understand that...Taking Au3Cu-type sublattice system as an example, three discoveries have been presented. First, the fourth barrier to hinder the progress of metal materials science is that today’s researchers do not understand that the Gibbs energy function of an alloy phase should be derived from Gibbs energy partition function constructed of alloy gene sequence and their Gibbs energy sequence. Second, the six rules for establishing alloy gene Gibbs energy partition function have been discovered, and it has been specially proved that the probabilities of structure units occupied at the Gibbs energy levels in the degeneracy factor for calculating configuration entropy should be degenerated as ones of component atoms occupied at the lattice points. Third, the main characteristics unexpected by today’s researchers are as follows. There exists a single-phase boundary curve without two-phase region coexisting by the ordered and disordered phases. The composition and temperature of the top point on the phase-boundary curve are far away from those of the critical point of the Au3Cu compound; At 0 K, the composition of the lowest point on the composition-dependent Gibbs energy curve is notably deviated from that of the Au3Cu compounds. The theoretical limit composition range of long range ordered Au3Cu-type alloys is determined by the first jumping order degree.展开更多
Nitrogen monoxide(NO) emitted from automobile exhaust and other industrial sources contributes largely to a variety of environmental problems, such as the formation of acid rain and photochemical smog Therefore, the c...Nitrogen monoxide(NO) emitted from automobile exhaust and other industrial sources contributes largely to a variety of environmental problems, such as the formation of acid rain and photochemical smog Therefore, the catalytic reduction of NO has become one of the urgent environmental issues In the present study, a series of Au/Mn 2O 3/Al 2O 3 catalysts, with different Mn 2O 3 loadings, were prepared by deposition precipitation The crystallite size of Au before and after reaction was characterized by XRD The activity of catalysts in the selective catalytic reduction of NO using propane in the presence of oxygen was evaluated It is found that the catalytic activity of Au/Mn 2O 3/Al 2O 3 is higher than that of Au/Al 2O 3 and Cu ZSM 5 at feed gas(0 6%NO+1 2%C 3H 8+5%O 2+He) and GHSV 5?000?h展开更多
Density functional （B3LYP）method with relativistic effective core potential （RECP）was used to optimize the structures of Au2 and Au3 molecule,whose equilibrium nuclear distance,dissociation energies,spectral const...Density functional （B3LYP）method with relativistic effective core potential （RECP）was used to optimize the structures of Au2 and Au3 molecule,whose equilibrium nuclear distance,dissociation energies,spectral constances and harmonic frequencies were obtained.The Murrell-Sorbie potential energy function of Au2 moleoule was derived to be fitted to ab initio data through the least square fitting,and the potential energy function of Au3 is driven by many-body expansion theory.展开更多
基金Project(51071181)supported by the National Natural Science Foundation of ChinaProject(2013FJ4043)supported by the Natural Science Foundation of Hunan Province,China
文摘Taking Au3Cu-type sublattice system as an example, three discoveries have been presented. First, the fourth barrier to hinder the progress of metal materials science is that today’s researchers do not understand that the Gibbs energy function of an alloy phase should be derived from Gibbs energy partition function constructed of alloy gene sequence and their Gibbs energy sequence. Second, the six rules for establishing alloy gene Gibbs energy partition function have been discovered, and it has been specially proved that the probabilities of structure units occupied at the Gibbs energy levels in the degeneracy factor for calculating configuration entropy should be degenerated as ones of component atoms occupied at the lattice points. Third, the main characteristics unexpected by today’s researchers are as follows. There exists a single-phase boundary curve without two-phase region coexisting by the ordered and disordered phases. The composition and temperature of the top point on the phase-boundary curve are far away from those of the critical point of the Au3Cu compound; At 0 K, the composition of the lowest point on the composition-dependent Gibbs energy curve is notably deviated from that of the Au3Cu compounds. The theoretical limit composition range of long range ordered Au3Cu-type alloys is determined by the first jumping order degree.
文摘Nitrogen monoxide(NO) emitted from automobile exhaust and other industrial sources contributes largely to a variety of environmental problems, such as the formation of acid rain and photochemical smog Therefore, the catalytic reduction of NO has become one of the urgent environmental issues In the present study, a series of Au/Mn 2O 3/Al 2O 3 catalysts, with different Mn 2O 3 loadings, were prepared by deposition precipitation The crystallite size of Au before and after reaction was characterized by XRD The activity of catalysts in the selective catalytic reduction of NO using propane in the presence of oxygen was evaluated It is found that the catalytic activity of Au/Mn 2O 3/Al 2O 3 is higher than that of Au/Al 2O 3 and Cu ZSM 5 at feed gas(0 6%NO+1 2%C 3H 8+5%O 2+He) and GHSV 5?000?h
文摘Density functional （B3LYP）method with relativistic effective core potential （RECP）was used to optimize the structures of Au2 and Au3 molecule,whose equilibrium nuclear distance,dissociation energies,spectral constances and harmonic frequencies were obtained.The Murrell-Sorbie potential energy function of Au2 moleoule was derived to be fitted to ab initio data through the least square fitting,and the potential energy function of Au3 is driven by many-body expansion theory.
