作　　者： ; ; ; ; ; ;

机构地区： 茂名学院化工与环境工程学院化工研究所

出　　处： 《安全与环境学报》 2005年第2期20-23,共4页

摘　　要： 通过固定床反应器实验,探索Na2 CO3/ γ-Al2 O3吸附催化剂对SO2 和NO的吸附状况,并根据吸附催化剂上活性位机理对实验结果进行初步解释。反应条件为:T=42 3 K,常压,GHSV=2 0 64 0 L /(kg·h)。实验数据主要通过分别测定SO2 和NO的进出口浓度得出。研究结果表明,SO2 可以被吸附催化剂单独吸附储存,不受NO和其他组分的影响,但是NO被吸附的前提是与SO2 和O2 同时存在。水蒸气和O2 的同时存在可使SO2 的吸附量明显增加。实验结果还表明,NO的吸附依赖烟道气入口SO2 / NO物质的量比,其吸附性能受SO2浓度的影响。过大或小的SO2 / NO比都不利于提高NO的吸附量,过小的SO2 / NO比影响了NO的吸附速率。被SO2 或SO2 、O2 和水蒸气预先饱和吸附的吸附催化剂,也不能使NO(有氧气和水蒸气存在)在无SO2 的条件下被吸附。烟道气中的水蒸气有利于SO2 The purpose of this paper is to explore the performance of SO_2-NO adsorption on Na_2CO_3/γ-Al_2O_3 sorbent-catalyst by means of experiments in a fixed bed reactor and give a tentative explanation as to the results of the experiments according to the mechanism of active sites *. As is known, it is possible for SO_2and the active sites on the Na_2CO_3/γ-Al_2O_3 to form SO~_2, where intermediate [NO_2(SO_3) ^(\%x\%)] is accumulated by O_2 and NO. And, next, it is possible to form stable nitrate/nitrite and sulfate on the surface of the sorbent-catalyst with Na_2CO_3. As a matter of fact, SO~_2 is likely to be stable on the surface or to result in sulfate in presence of O_2, however, it is not likely to result in NO* species. As to the Na_2CO_3/γ-Al_2O_3 sorbent-catalyst, it can be prepared by impregnating γ-Al_2O_3 powder in aqueous solution of Na_2CO_3. After being dried and calcined, the catalyst can be stacked in a reactor. The present paper has also investigated the adsorptions of SO_2-NO in presence of 423 K, the atmosphere pressure and (20 640) L/kg·h of GHSV. The experimental data obtained by measuring inlet and outlet concentration of SO_2 and NO, respectively, indicate that SO_2 can be adsorbed on sorbent-catalyst independently no matter whether in the presence of NO and other compositions or not. The simultaneous presence of O_2 and H_2O may cause SO_2 adsorption rise significantly. What is more, a strong dependence of NO removal on the inlet SO_2/NO mole rate was observed. The performance of NO adsorption proves to be influenced by the concentration of SO_2. On the one hand, SO_2/NO mole rate proves not to be favorable for the NO adsorption capacity, on the other hand, smaller rate of SO_2/NO mole may affect the rate of NO adsorption. The sorbent-catalyst saturated previously by SO_2or SO_2, H_2O and O_2 do not adsorb NO even if O_2 either, with H_2O but without SO_2. Steam in flue gas also proves advantageous to the dsorption of both SO_2 and NO.

关 键 词： 环境工程 烟道气 和 吸附 吸附 催化剂 中间体 活性位

领　　域： [环境科学与工程]