This work aimed at studying the feasibility of calculating the coal-oxygen diffusion properties during the low temperature oxidation process of lignite so as to predict its spontaneous combustion process. Coal samples...This work aimed at studying the feasibility of calculating the coal-oxygen diffusion properties during the low temperature oxidation process of lignite so as to predict its spontaneous combustion process. Coal samples were oxidized in air ambient under different temperatures. Scanning Electron Microscope was used to indicate the surface morphology changes of oxidization. Then, based on fractal theory and flow characteristics, the ffactal dimension of gas diffusion in the pore ways was calculated under different temperature. Considering pore size distribution, connectivity distribution and Fick diffusion mechanisms, the relationship between the gas diffusivity change with pore area ffactal dimension and porosity was investigated, and multiple linear equation of the coal- oxygen diffusion coefficients and pore parameters was obtained. Comparison between the experimental data and model prediction verifies the validiW of the model. The research provides a theoretical basis for the prediction model of coal-oxygen diffusion law.展开更多
Two new compounds with microporous Co3[MnMo9O32].15H2O(1) and Cu3[MnMo9O32].15H2O(2) have been synthesized,and characterized by IR,element analysis,TG and single-crystal X-ray analysis.The structure analyses reveal th...Two new compounds with microporous Co3[MnMo9O32].15H2O(1) and Cu3[MnMo9O32].15H2O(2) have been synthesized,and characterized by IR,element analysis,TG and single-crystal X-ray analysis.The structure analyses reveal that compounds 1 and 2 are isostructural.In crystal,the Waugh-type polyoxoanions [MnMo9O32]6-are connected by Co2+ or Cu2+ cations to a 3D open-framework,which possesses channels along the [1 2 2] direction of approximately 8.27 × 11.97 .The photocatalytic performances of compounds 1 and 2 for photodegradation of RhB with UV irradiation have been studied,which show a good photocatalytic activity for photodegradation of RhB.展开更多
基金Supported by the National Natural Science Foundation of China(51204179,51204182)the Natural Science Foundation of Jiangsu Province,China(BK20141242)
文摘This work aimed at studying the feasibility of calculating the coal-oxygen diffusion properties during the low temperature oxidation process of lignite so as to predict its spontaneous combustion process. Coal samples were oxidized in air ambient under different temperatures. Scanning Electron Microscope was used to indicate the surface morphology changes of oxidization. Then, based on fractal theory and flow characteristics, the ffactal dimension of gas diffusion in the pore ways was calculated under different temperature. Considering pore size distribution, connectivity distribution and Fick diffusion mechanisms, the relationship between the gas diffusivity change with pore area ffactal dimension and porosity was investigated, and multiple linear equation of the coal- oxygen diffusion coefficients and pore parameters was obtained. Comparison between the experimental data and model prediction verifies the validiW of the model. The research provides a theoretical basis for the prediction model of coal-oxygen diffusion law.
基金financially supported by the National Natural Science Foundation of China(20701005 & 20701006)the Fundamental Research Funds for the Central Universitues,Postdoctoral Station Foundation of Ministry of Education(20060200002)+1 种基金the Testing Foundation of Northeast Normal University(NENU),Science and Technology Creation Foundation of NENU(NENU-STC07009)the Program for Changjiang Scholars and Innovative Research Team in University
文摘Two new compounds with microporous Co3[MnMo9O32].15H2O(1) and Cu3[MnMo9O32].15H2O(2) have been synthesized,and characterized by IR,element analysis,TG and single-crystal X-ray analysis.The structure analyses reveal that compounds 1 and 2 are isostructural.In crystal,the Waugh-type polyoxoanions [MnMo9O32]6-are connected by Co2+ or Cu2+ cations to a 3D open-framework,which possesses channels along the [1 2 2] direction of approximately 8.27 × 11.97 .The photocatalytic performances of compounds 1 and 2 for photodegradation of RhB with UV irradiation have been studied,which show a good photocatalytic activity for photodegradation of RhB.
