Simultaneous Removal of NOx and Soot in Diesel Exhaust by Using a Centrifugal Fluidized Bed

离心流化床同时去除柴油机尾气中的NOx和烟灰

• 批准号: 10555065
• 负责人: TSUTSUMI Atsushi
• 金额: $ 8万
• 依托单位: University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B).
• 财政年份: 1998
• 资助国家: 日本
• 起止时间: 1998 至 2000
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-10555065/
• 关键词: Diesel Exhaust; NOx; Soot; Centrifugal Fluidized Bed; Reduction of NOx; Soot Removal; NO_x

Reduction of nitrogen oxides emitted from a diesel engine with soot over a Cu-ZSM-5 zeolite catalyst has been experimentally. It was found that in the presence of oxygen, the soot promoted NO_x reduction into nitrogen over the Cu-ZSM-5 zeolite catalyst. Restults show that NO_2 is formed through the reaction of NO and O_2 and is then partially reduced into N_2 by soot over the CU-ZSM-5 zeolite catalyst. Activated carbon was observed to be also as effective as soot in the removal of nitrogen oxides over this catalyst. At 693 K, the rate of the nitrogen oxide removal reaction was found to be proportional to the NO concentration. The mechanisms of this reaction are discussed based on the results obtained from the kinetic study.In addition, in order to remove NOx and soot simultaneously, the application of the centrifugal fluidized bed with ultrafine catalyst particles is proposed. The fluidization of nanoparticles has been conducted in a centrifugal fluidized bed (CenFB). In the case of 7 and 20 nm particle systems, the nanoparticles are fluidized with forming agglomerates in the range of 9.1<G<18.5. The fluidization quality of nanoparticles with high G is affected by not only the primary particle size but also agglomerates size and its structure.

对Cu-ZSM-5分子筛催化剂降低柴油机碳烟排放的氮氧化物进行了实验研究。结果表明，在氧气存在下，碳烟促进了Cu-ZSM-5分子筛催化剂上NO_x还原为氮气。结果表明，在Cu-ZSM-5分子筛催化剂上，NO与O_2反应生成NO_2，然后被炭黑部分还原为N_2。观察到活性炭在该催化剂上去除氮氧化物方面也与烟灰一样有效。在693 K时，氮氧化物去除反应的速率与NO浓度成正比。在动力学研究的基础上，探讨了该反应的机理，并提出了采用超细催化剂颗粒离心流化床同时脱除NOx和碳烟的设想。纳米颗粒的流化已经在离心流化床（CenFB）中进行。在7和20 nm颗粒系统的情况下，纳米颗粒流化，形成9.1<G<18.5范围内的附聚物。高G值纳米颗粒的流化质量不仅受初始颗粒尺寸的影响，还受团聚体尺寸及其结构的影响。

项目成果

Matsuda,S.,H.Hatano,K.Kuramoto and A.Tsutsumi: "Fluidization of Ultrafine Particles with High G"J.Chem.Eng.Jpn.. (in press). (2001)

Matsuda,S.,H.Hatano,K.Kuramoto 和 A.Tsutsumi：“高 G 超细颗粒的流化”J.Chem.Eng.Jpn..（印刷中）。

Matsuda,S.,H.hatano,T.Muramoto and A.Tsutsumi,,: "Particle and Bubble Behavior in Ultrafine Particle Fluidization with High G"Fluidization X. (in press). (2001)

Matsuda,S.、H.hatano、T.Muramoto 和 A.Tsutsumi,，：“高 G 超细颗粒流化中的颗粒和气泡行为”Fluidization X.（印刷中）。

Matsuda,S.,H.Hatano,T.Muramoto and A.Tsutsumi,,: "Particle and Bubble Behavior in Ultrafine Particle Fluidization with High G"Fluidization X, in press. (2001)

Matsuda,S.、H.Hatano、T.Muramoto 和 A.Tsutsumi,，：“高 G 超细颗粒流化中的颗粒和气泡行为”流化 X，正在出版。

Matsuda, S., H.Hatano, T.Muramoto and A.Tsutsumi: "Particle and Bubble Behavior in Ultrafine Particle Fluidization with High G"Fluidization X. (in press). (2001)

Matsuda, S.、H.Hatano、T.Muramoto 和 A.Tsutsumi：“高 G 超细颗粒流化中的颗粒和气泡行为”Fluidization X.（印刷中）。

Matsuda, S., H.Hatano, K.Kuramoto and A.Tsutsumi: "Fluidization of Ultrafine Particles with High G"J.Chem.Eng.Jpn.. 34(2). 121-125 (2001)

Matsuda, S.、H.Hatano、K.Kuramoto 和 A.Tsutsumi：“高 G 超细颗粒的流化”J.Chem.Eng.Jpn.. 34(2)。