Synthesis and characterization of potassium titanates used as soot oxidation catalyst in diesel exhaust
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摘要: 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。Abstract: 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.
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Key words:
- diesel exhaust /
- soot /
- potassium titanates /
- TiO2 /
- K2CO3
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