In this paper, the effect of Ba(NO 3) 2 on the efficiency of sulfur fixation of calcium oxide during coal combustion was studied. The results showed that addition of barium nitrate to the CaO can enhance the sulfur ...In this paper, the effect of Ba(NO 3) 2 on the efficiency of sulfur fixation of calcium oxide during coal combustion was studied. The results showed that addition of barium nitrate to the CaO can enhance the sulfur removal rate of CaO significantly. The X \|ray diffraction spectrum of residual ash of coal added some sulfur fixative expressed that Ba\+\{2+\} can form a compound of Ba\|Al\|Si\|O which encloses the CaSO\-4 to prevent it's decomposition, so Ba\+\{2+\} can improve the action of sulfur fixation of CaO. The combustion character of the original coal and original coal added sulfur fixative was researched with thermal\|gravity analyzer and the results expressed that adding some sulfur fixative to the coal will make the combustion character of coal change little.展开更多
The crystallization behavior of desulfurization product is directly related to its high-temperature-resistant ability.Effects of the additive on the sulfur-fixation efficiency of the Ba-sulfur-fixation agent and also ...The crystallization behavior of desulfurization product is directly related to its high-temperature-resistant ability.Effects of the additive on the sulfur-fixation efficiency of the Ba-sulfur-fixation agent and also on the crystallization behavior of the sulfur-fixation product were studied when CaCO 3 and BaCO 3 were used as the desulfurization agent and MgO and SrCO 3 used as the assistant sulfur-fixation agent. The result shows that increase of sulfur-fixation capability for the additive is not owe to their directly react to form sulfate or interact with CaCO 3 and BaCO 3 to form composite mineral heat-resistant in high temperature, but owe to their activation to sulfur-fixation reaction of the sulfur-fixation agent.展开更多
The photochemical reaction of sulfur dioxide （802） with tetraphenylporphyrin magnesium （MgTPP） has been investigated in dichloromethane （CH2C12） solution at room temperature with illumination by visible light. C...The photochemical reaction of sulfur dioxide （802） with tetraphenylporphyrin magnesium （MgTPP） has been investigated in dichloromethane （CH2C12） solution at room temperature with illumination by visible light. Conventional fluorescence, UV-vis, and MS spectral analyses showed that under these conditions, SO2 was initially photochemically fixed by MgTPP to form a 1：1 molecular adduct. On continued irradiation and maintaining the flow of SO2, MS and XRD results showed that MgTPP is re- markably effective in the photochemical reduction of SO2 to sulfide （S2 ）. The kinetics of the photochemical reaction of MgTPP with SO2 was studied in a SO2-saturated solution. Under irradiation, the reaction follows pseudo first order kinetics for MgTPP, having a half-life decreasing from 106 to 57 min as the illumination intensity is increased from 350 to 600 Lm. This investigation of the photochemical fixation and reduction of SO2 by MgTPP is of key interest in elucidating fundamental pho- tochemical reaction mechanisms associated with porphyrins in the presence of SO2; furthermore, the analysis of the photo- chemical reaction may offer new opportunities for the fixation and reduction of SO2 to less harmful species.展开更多
文摘In this paper, the effect of Ba(NO 3) 2 on the efficiency of sulfur fixation of calcium oxide during coal combustion was studied. The results showed that addition of barium nitrate to the CaO can enhance the sulfur removal rate of CaO significantly. The X \|ray diffraction spectrum of residual ash of coal added some sulfur fixative expressed that Ba\+\{2+\} can form a compound of Ba\|Al\|Si\|O which encloses the CaSO\-4 to prevent it's decomposition, so Ba\+\{2+\} can improve the action of sulfur fixation of CaO. The combustion character of the original coal and original coal added sulfur fixative was researched with thermal\|gravity analyzer and the results expressed that adding some sulfur fixative to the coal will make the combustion character of coal change little.
文摘The crystallization behavior of desulfurization product is directly related to its high-temperature-resistant ability.Effects of the additive on the sulfur-fixation efficiency of the Ba-sulfur-fixation agent and also on the crystallization behavior of the sulfur-fixation product were studied when CaCO 3 and BaCO 3 were used as the desulfurization agent and MgO and SrCO 3 used as the assistant sulfur-fixation agent. The result shows that increase of sulfur-fixation capability for the additive is not owe to their directly react to form sulfate or interact with CaCO 3 and BaCO 3 to form composite mineral heat-resistant in high temperature, but owe to their activation to sulfur-fixation reaction of the sulfur-fixation agent.
基金supported by the Foundation of Inner Mongolia Autonomous Region’s Educational Commission(NJZZ11068)the School Scientific Research Fund (ZD201004,Inner Mongolia University of Technology,China)Yongfeng Boyuan Industry Co.,Ltd. (Jiangxi Province,China)
文摘The photochemical reaction of sulfur dioxide （802） with tetraphenylporphyrin magnesium （MgTPP） has been investigated in dichloromethane （CH2C12） solution at room temperature with illumination by visible light. Conventional fluorescence, UV-vis, and MS spectral analyses showed that under these conditions, SO2 was initially photochemically fixed by MgTPP to form a 1：1 molecular adduct. On continued irradiation and maintaining the flow of SO2, MS and XRD results showed that MgTPP is re- markably effective in the photochemical reduction of SO2 to sulfide （S2 ）. The kinetics of the photochemical reaction of MgTPP with SO2 was studied in a SO2-saturated solution. Under irradiation, the reaction follows pseudo first order kinetics for MgTPP, having a half-life decreasing from 106 to 57 min as the illumination intensity is increased from 350 to 600 Lm. This investigation of the photochemical fixation and reduction of SO2 by MgTPP is of key interest in elucidating fundamental pho- tochemical reaction mechanisms associated with porphyrins in the presence of SO2; furthermore, the analysis of the photo- chemical reaction may offer new opportunities for the fixation and reduction of SO2 to less harmful species.
