G-C3N4 was supported on the surface of foamed ceramic,and the g-C3N4@foamed ceramic was packed in the photocatalytic reactor in a layered manner.Effects of urea and H2O2 concentration on NO conversion were investigate...G-C3N4 was supported on the surface of foamed ceramic,and the g-C3N4@foamed ceramic was packed in the photocatalytic reactor in a layered manner.Effects of urea and H2O2 concentration on NO conversion were investigated.Pulse experiments were carried out to investigate the change of NO conversion with time under different concentrations of H2O2.The contribution of each route that NO converted and the selectivities of products were calculated.Results showed that the photo-reduction of NO accounted for 2%,and the photo-oxidation of NO accounted for 14%,and the rest was absorbed by the humidifier.Products include ammonia(NH+4-N),nitrogen(N2),nitrite(NO-2-N)and nitrate(NO-3-N),of which N2 accounted for 9%.展开更多
The effect of rare earth oxides Y 2O 3 or CeO 2 on sintering properties of Si 3N 4 ceramics was studied and the mechanism of assisting action during sintering was analyzed. The results indicate that the best sint...The effect of rare earth oxides Y 2O 3 or CeO 2 on sintering properties of Si 3N 4 ceramics was studied and the mechanism of assisting action during sintering was analyzed. The results indicate that the best sintering properties appear in Si 3N 4 ceramics with 5% Y 2O 3 or 8% CeO 2. Secondary crystallites are formed at grain boundaries after heat treatment, which decreases the amount of glass phase and contributes to the improvement of high temperature mechanical properties of silicon nitride.展开更多
基金supported by Shandong Electric Power Construction Third Engineering Co.,Ltd.(20173702021476)the“HUIMN Science and Technology”project of Qingdao(17-3-3-71-nsh)+1 种基金the High-concentration Organic Wastewater Adsorbent Production Process(20170903)the National Natural Science Foundation of China(51602297,U1510109)。
文摘G-C3N4 was supported on the surface of foamed ceramic,and the g-C3N4@foamed ceramic was packed in the photocatalytic reactor in a layered manner.Effects of urea and H2O2 concentration on NO conversion were investigated.Pulse experiments were carried out to investigate the change of NO conversion with time under different concentrations of H2O2.The contribution of each route that NO converted and the selectivities of products were calculated.Results showed that the photo-reduction of NO accounted for 2%,and the photo-oxidation of NO accounted for 14%,and the rest was absorbed by the humidifier.Products include ammonia(NH+4-N),nitrogen(N2),nitrite(NO-2-N)and nitrate(NO-3-N),of which N2 accounted for 9%.
文摘The effect of rare earth oxides Y 2O 3 or CeO 2 on sintering properties of Si 3N 4 ceramics was studied and the mechanism of assisting action during sintering was analyzed. The results indicate that the best sintering properties appear in Si 3N 4 ceramics with 5% Y 2O 3 or 8% CeO 2. Secondary crystallites are formed at grain boundaries after heat treatment, which decreases the amount of glass phase and contributes to the improvement of high temperature mechanical properties of silicon nitride.
