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首页> 外文期刊>Environmental Science & Technology >Catalytic Ozonation of Propanal Using Wood Fly Ash and Metal Oxide Nanoparticle Impregnated Carbon
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Catalytic Ozonation of Propanal Using Wood Fly Ash and Metal Oxide Nanoparticle Impregnated Carbon

机译：木材粉煤灰和金属氧化物纳米粒子浸渍碳催化丙烷臭氧氧化。

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Catalytic ozonation of propanal at ambient temperatures (23-25℃) was investigated by varying propanal and ozone concentrations and catalyst type. The catalysts tested included wood fly ash (WFA), magnetically separated ash, synthetic hematite and magnetite, and metal oxide nanoparticle impregnated activated carbon and peanut hull char. A power law model independent of ozone concentration for WFA (r_w, moles g~(-1) s~(-1)) and magnetite (r_m) were, respectively, r_w = K_w C_R(0.89) and r_m = K_mC_R~(1.55) ,where K_w, and K_m were 2.36 × 10~(-6) g~(-1) s~(-1) (moles)~(-0.11) (m~3)~(0.89) and 6.5 × 10~(-4) g~(-1) s~(-1) (moles)~(-0.55) (m~3)~(1.55), respectively (5-15 ppmv). Magnetite and hematite present in the WFA were theorized to be the primary active sites, since magnetically separated WFA had a significantly higher reaction rate (～12x, mol m~(-2)s~(-1)) than that of WFA. X-ray diffraction analysis demonstrated a qualitative increase in magnetite and hematite in the magnetically separated ash, and synthetic magnetite and hematite had reaction rates > 80× and 200× that of WFA or activated carbon (surface area basis). Supercritical deposition of hematite on/in peanut hull char successfully generated a porous, pelleted catalystfrom an agricultural residue capable of oxidizing propanal at rates 12× activated carbon and similar to commercially available catalysts (per mass basis). Water vapor significantly increased the propanal reaction rate when using wood fly ash and activated carbon.
机译：通过改变丙醛和臭氧的浓度以及催化剂的种类，研究了丙醛在环境温度（23-25℃）下的催化臭氧氧化作用。测试的催化剂包括木粉煤灰（WFA），磁选灰，合成赤铁矿和磁铁矿，以及金属氧化物纳米颗粒浸渍的活性炭和花生壳炭。与WFA（r_w，摩尔g〜（-1）s〜（-1）的摩尔）和磁铁矿（r_m）的臭氧浓度无关的幂律模型分别为r_w = K_w C_R（0.89）和r_m = K_mC_R〜（1.55） ），其中K_w和K_m为2.36×10〜（-6）g〜（-1）s〜（-1）（摩尔）〜（-0.11）（m〜3）〜（0.89）和6.5×10〜 （-4）g〜（-1）s〜（-1）（摩尔）〜（-0.55）（m〜3）〜（1.55）（5-15 ppmv）。理论上将WFA中存在的磁铁矿和赤铁矿作为主要的活性部位，因为磁性分离的WFA具有比WFA更高的反应速率（〜12x，mol m〜（-2）s〜（-1））。 X射线衍射分析表明，磁性分离的灰分中磁铁矿和赤铁矿的质量增加，合成磁铁矿和赤铁矿的反应速率分别大于WFA或活性炭的80倍和200倍（基于表面积）。赤铁矿在花生壳炭上/中的超临界沉积成功地从能够以12倍活性炭速率氧化丙醛的农业残渣中生成了多孔的颗粒状催化剂，并且类似于市售催化剂（按质量计）。当使用木粉煤灰和活性炭时，水蒸气显着提高了丙醛的反应速率。

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