柴油机尾气碳黑氧化催化剂钛酸钾的制备与表征

以TiO₂和K₂CO₃为原料，采用固相法合成K/Ti比不同的钛酸钾催化剂。利用XRD和SEM对催化剂结构进行表征，并通过程序升温反应（TPR）对催化剂活性进行评估。结果表明，K₂Ti₂O₅在850℃达到较好的结晶度，分别以CH₃COOK、KNO₃及K₂CO₃作为K前驱体时，制备出的K₂Ti₂O₅结晶程度基本一致；K/Ti比较高的K₂Ti₂O₅可明显降低碳黑颗粒氧化温度，最低起燃温度为280℃，且K₂Ti₂O₅比担载贵金属Pt催化剂的碳黑氧化催化活性更高。

Synthesis and characterization of potassium titanates used as soot oxidation catalyst in diesel exhaust

Potassium titanates of different K/Ti ratio were synthesized by solid-phase method using TiO₂ and K₂CO₃ as raw materials. The catalysts were characterized by SEM and XRD, and their catalytic activities were evaluated by soot oxidation reaction using TPR system. The results showed that K₂Ti₂O₅ had good crystallinity at 850℃, and the synthesized K₂Ti₂O₅ almost had the same degree of crystallinity using CH₃COOK、KNO₃ and K₂CO₃ as precursors of K, respectively；K₂Ti₂O₅ of high K/Ti ratio can significantly reduce the soot oxidation temperature, the lowest ignition temperature was 280℃, and K₂Ti₂O₅ had higher catalytic activity than the Pt-impregnated catalyst in soot oxidation.