LaFeO_3系钙钛复合氧化物降低卷烟烟气中的NO_x

Reduction of NO_x in Cigarette Smoke with Perovskite-type Oxides of LaFeO_3 Family

为降低卷烟烟气中的氮氧化物(NOx),采用TG、XRD、氮吸附和TEM等方法测定了LaFeO3钙钛矿型复合金属氧化物——LaFe0.85Pd0.05Cu0.1O3的热稳定性、比表面积、粒子的形状与大小,以及对NO的分解催化活性,并以添加于造纸法再造烟叶中的形式,考察了该氧化物对卷烟烟气中NOx等有害成分的影响。结果表明:于700℃下焙烧2h,该氧化物的比表面积为17.24m2/g,平均粒径50nm,具有较高的NO分解催化活性;与对照相比,含1.5%该复合金属氧化物的卷烟烟气中NOx含量降低13.0%,比焦油多降低约9百分点。

In order to reduce the NOx in mainstream cigarette smoke, the thermal stability, specific surface area, shape, size, catalytic activity for NO decomposition of nanoparticulate perovskite oxide （LaFe0.85Pd0.05Cu0.1O3） were tested by thermal gravity （TG） , X-ray diffraction （XRD） , nitrogen adsorption, and transmission electron microscope （TEM）. By adding it into paper-making process reconstituted tobacco, the effects of LaFe0.85Pd0.05Cu0.1O3 on NOx and other harmful components in cigarette smoke were investigated. The results indicated that the specific surface area and average diameter of the oxide roasted at 700℃ for 2 hours were 17.24 m2/g and 50 nm, respectively, which had higher catalytic activity for NO decomposition. Comparing with the contrast, a cigarette contains 1.5% of this oxide in filler, the content of NOx in its mainstream smoke decreases by 13.0%