Development of Catalytic NOx reduction

催化NOx还原技术的发展

• 批准号: 06555244
• 负责人: TAKITA Yusaku
• 金额: $ 5.06万
• 依托单位: Oita University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (A)
• 财政年份: 1994
• 资助国家: 日本
• 起止时间: 1994 至 1996
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-06555244/
• 关键词: NOx reduction; SAPO-34; Reaction Mechanism; Catalytic Process; Cu; SO2共存結果; 水蒸気の共存結果; 排ガス処理; NO分解触媒; NOx; SAPO; モノリス; NOxの還元分解; 触媒; シリコアルミノホスフェート; ゼオライト; プロピレン; アルミノホスフェート

CoAPSO-34 is a catalyst effective for selective NO reduction (SNR). SNR over Cu-SAPO-34 and Cu-CoAPSO-34 was studied in the presence of water vapor and SO_2 and found that SNR over Cu-SAPO-34 was retarded by the presence of water vapor and the NO conversion decreased by 10-20%. However, the addition of 200ppm SO_2 in the reaction system slightly depressed the NO conversion at 250-400ﾟC.Over Cu-CoAPSO-34, the presence of 7.0% water vapor in the reaction system brought about a small reduction (about 10%) in NO conversion over the temperatures examined and the incorporation of 200ppm SO_2 in this reaction system also decreased the NO conversion, however, it exceeded 40% at 300-400ﾟC.The structure of Cu-CoAPSO-34 was not changed after the reaction up to 500ﾟC.SO_2 will prefer to adsorb on Cu^<2+> at the catalyst surface than Co^<2+> and/or Co^<3+> located in the crystal lattice of SAPO-34. Because back donation of electrons of Cu^<2+> ions into adsorbed SO_2 molecules will be more feasible. When SV is so large as 32000h^<-1>, high NO conversion was maintained by the presence of relatively high concentration of C_3H_6,2000-3000ppm. A possible reaction mechanism was proposed by the experimental results using IR.

CoAPSO-34是一种有效的选择性NO还原催化剂。对Cu-SAPO-34和Cu-CoAPSO-34在水蒸气和SO_2存在下的信噪比进行了研究，发现水蒸气的存在使Cu-SAPO-34的信噪比降低，NO转化率降低了10-20%。在250 ~ 400ºC范围内，加入200ppm SO_2对NO转化率有轻微的抑制作用。在Cu-CoAPSO-34反应体系中，当水蒸气含量为7.0%时，NO转化率降低10%左右；当SO_2浓度为200ppm时，NO转化率降低，但在300-400℃时，NO转化率超过40%。Cu-CoAPSO-34的结构在反应至500℃时没有发生变化。SO_2更倾向于吸附在催化剂表面的Cu^<2+>上，而不是吸附在SAPO-34晶格中的Co^<2+>和/或Co^<3+>上。因为Cu^<2+ b>离子的电子回给到被吸附的SO_2分子中更可行。当SV大到32000h^<-1>时，较高浓度的C_3H_6 （2000-3000ppm）的存在维持了较高的NO转化率。通过红外光谱分析，提出了一种可能的反应机理。

项目成果

T.Ishihara, S.Sato, and Y,Takita: "Sensitive Detection of Nitrogen Oxides based on Capacitance Changes in Binary Oxide Mixture" Sensors and Actuators. B30. 43-45 (1996)

T.Ishihara、S.Sato 和 Y,Takita：“基于二元氧化物混合物中电容变化的氮氧化物灵敏检测”传感器和执行器。

T.Ishihara, S.Sato, Y,Takita: "Capacitive Type Sensors for the Selectivity Detection of Nitrogen Oxides" Proc.5th Intern Meet.Chem.Sens. 494-497 (1995)

T.Ishihara、S.Sato、Y、Takita：“用于选择性检测氮氧化物的电容式传感器”Proc.5th Intern Meet.Chem.Sens。

Y.Takita: "Copper Ion Exchanged Silicoaluminophosphate (SAPO) as a Thermostable Catalyst for Selective Reduction of Nox with Hydrocarbons." Zeolite and Related Microporous Materials : Stare of the Art 1994 (Eds.J.Weotkamp,H.G.Karge,H.Pfeifer and W.Holderi

Y.Takita：“铜离子交换硅铝磷酸盐 (SAPO) 作为热稳定催化剂，用于用碳氢化合物选择性还原氮氧化物。”

T.Ishihara: "Capacitive-type sensors for the selective detection of nitrogen oxides" Sensor snd Actuators. B24-25. 392-395 (1995)

T.Ishihara：“用于选择性检测氮氧化物的电容式传感器”传感器和执行器。

Y.Takita: "Sensitive Deteciton of Nitrogen Oxides based on Capacitance Changes in Binary Oxide Mixture." Sensors and Actuators. B30. 43-45 (1996)

Y.Takita：“基于二元氧化物混合物中的电容变化对氮氧化物进行灵敏检测。”