CAJ | 학술논문

模拟柴油机尾气中O2和NO的氛围,研究了以Ir为基础的催化剂对黑烟的催化氧化.与Pt/SiO2比较,Ir/SiO2对黑烟氧化有其相似的催化活性,但有更高的CO选择性.通过测定Ir含量对催化活性和CO选择性的影响,发现在研究的范围内(0到5%),随着Ir含量的增加,催化活性增加, CO选择性降低.此外,测定了氧化物载体对催化活性及CO选择性的影响,得到了催化活性顺序为Ir/ZSM-5 ＞ Ir/SiO2 ＞ Ir/γ-Al2O3, CO选择性顺序为 Ir/ZSM-5 ＜ Ir/γ-Al2O3 ＜ Ir/SiO2.
모의시유궤미기중O2화NO적분위,연구료이Ir위기출적최화제대흑연적최화양화.여Pt/SiO2비교,Ir/SiO2대흑연양화유기상사적최화활성,단유경고적CO선택성.통과측정Ir함량대최화활성화CO선택성적영향,발현재연구적범위내(0도5%),수착Ir함량적증가,최화활성증가, CO선택성강저.차외,측정료양화물재체대최화활성급CO선택성적영향,득도료최화활성순서위Ir/ZSM-5 ＞ Ir/SiO2 ＞ Ir/γ-Al2O3, CO선택성순서위 Ir/ZSM-5 ＜ Ir/γ-Al2O3 ＜ Ir/SiO2.
The soot oxidation with Ir-based catalysts was investigated using simulated diesel exhaust gases. By comparing with Pt/SiO2, Ir/SiO2 showed similarly catalytic activity and high CO selectivity. The effect of Ir content on the catalytic activity and CO selectivity was examined. With the increasing of Ir content in the range examined (from zero to 5%), the catalytic activity increased and the CO selectivity decreased. Furthermore, the effect of support oxides was obtained: the catalytic activity was Ir/ZSM-5 ＞ Ir/SiO2 ＞ Ir/γ-Al2O3 and the CO selectivity was Ir/ZSM-5 ＜ Ir/γ-Al2O3 ＜ Ir/SiO2.