Novel catalyst development for NOx removal from diesel engine emission

开发用于去除柴油发动机排放物中氮氧化物的新型催化剂

• 批准号: 12555224
• 负责人: KIKUCHI Eiichi
• 金额: $ 8.32万
• 依托单位: Waseda University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2000
• 资助国家: 日本
• 起止时间: 2000 至 2003
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-12555224/
• 关键词: NO reduction; Zeolite catalyst; Fe catalyst; Resistance for steam; ZSM-5; Catalyst preparation method; Acid treatment; Methane; 窒素酸化物; 鉄の添加効果; イオン交換法; 含浸; 選択還元; NO_x; Ir触媒; メソポーラス; シリカライト; BEA; NOx; ゼオライト; SOx; 細孔径; ディーゼル排ガス; 窒素酸化物除

Pd/ZSM-5 catalyst shows characteristic features on NO-CH_4-selective reduction reaction, for example, high stability under excess O_2 and steam condition, high activity, and so on. So this catalyst seems to be a good candidate for lean burn combustion of natural gas at high temperature. So far, this catalyst has one defect, which is hydrothermal stability. One of the solutions is exploring new additive like Co. We conducted several attempt for the improvement of this catalyst, and one of the goal is Fe addition for solving these problems.First, we prepared Pd/ZSM-5, PdFe/ZSM-5, Fe/ZSM-5 catalysts. Experiments were conducted under atmospheric pressure and using fixed bed reactor.As for the activity and stability of Pd/ZSM-5 and PdFe/ZSM-5 catalysts, PdFe/ZSM-5 showed high NO conversion as high as 55.2%, and it was rather higher than that of Pd/ZSM-5, 42.2%. And there were no difference on the stability of catalyst between these two catalysts. We supposed that there are two different active sites on this Pd/Fe/ZSM-5 catalyst, because Fe catalyst did not show any activities on NO-CH_4-selective catalytic reduction.So, we postulated that Fe/ZSM-5 catalyst is only effective under the existence of activated carbon species like activated hydrocarbon formed on Pd site

Pd/ZSM-5催化剂在NO-CH_4-选择性还原反应中表现出在过量氧和水蒸气条件下稳定性好、活性高等特点，有望成为天然气高温稀燃催化剂。到目前为止，该催化剂存在一个缺陷，即水热稳定性。本文首先制备了Pd/ZSM-5、PdFe/ZSM-5、Fe/ZSM-5催化剂，并对其催化性能进行了表征，考察了催化剂的组成、催化剂的活性、催化剂的稳定性、催化剂的稳定性、催化剂的稳定性和催化剂的稳定性。在常压固定床反应器中进行了NO转化率的测定，Pd/ZSM-5和PdFe/ZSM-5催化剂的活性和稳定性表明，PdFe/ZSM-5催化剂的NO转化率高达55.2%，明显高于Pd/ZSM-5催化剂的42.2%。两种催化剂的催化稳定性无明显差异。由于Fe催化剂对NO-CH_4-选择性催化还原反应没有任何活性，我们推测Pd/Fe/ZSM-5催化剂上存在两种不同的活性中心，因此推测Fe/ZSM-5催化剂只有在Pd位上形成活性烃等活性炭物种的存在下才有效

项目成果

Ogura et al.: "Formation of uniform mesopores in ZSM-5 zeolite through treatment in alkaline solution"Chemistry Letters. 2000. 882-88* (2000)

Ogura 等人：“通过在碱性溶液中处理在 ZSM-5 沸石中形成均匀的中孔”化学快报。

松方正彦,小倉賢: "ドライゲルコンバージョン法によるゼオライト合成"機能材料. 20. 64-73 (2000)

Masahiko Matsukata，Ken Ogura：“干凝胶转化法合成沸石”功能材料。20. 64-73 (2000)。

Ogura et al.: "Effect of NH_4^+ exchange on hydrophobicity and catalytic properties of Al free Ti-Si-beta zeolite"Journal of Catalysis. in press. (2001)

Ogura等人：“NH_4^交换对无Al Ti-Si-β沸石疏水性和催化性能的影响”催化杂志。

M.Ogura, E.Kikuchi: "Co Cation Effects on Activity and Selectivity of Isolated Pd (II)"Journal of Catalysis. 211. 75-84 (2002)

M.Ogura、E.Kikuchi：“Co 阳离子对分离 Pd (II) 活性和选择性的影响”催化杂志。

Ogura et al.: "Catalytic Activity of Ir for NO-CO Reaction in the Presence of SO_2 and Excess Oxygen"Chemistry Letters. 2000. 146-147 (2000)

Ogura等人：“在SO_2和过量氧气存在下Ir对NO-CO反应的催化活性”化学快报。