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首页> 外文期刊>Journal of Environmental Science and Health. A, Toxic/Hazardous Substances & Environmental Engineering >Study on Catalytic Incineration of Methane Using Cr_2O_3/γ-Al_2O_3 as the Catalyst
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Study on Catalytic Incineration of Methane Using Cr_2O_3/γ-Al_2O_3 as the Catalyst

机译：Cr_2O_3 /γ-Al_2O_3催化甲烷甲烷焚烧研究

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A fixed bed reactor was employed to investigate the catalytic incineration of CH_4 by various supported transition metal oxide catalysts, with a view of finding the optimal one. Results indicated that the active species, the support, the metal content, the weight hourly space velocity (WHSV), and the inlet CH4 concentration were all important factors affecting CH4 oxidation. Cr_2O_3/γ-Al_2O_3 was found to be the most active catalyst among the seven γ-Al_2O_3-supported metal oxide catalysts tested. With Cr2O3 as the active species, γ-Al_2O_3 was the most suitable of six supports tested. Furthermore, the optimal Cr content of Cr_2O_3/γ-Al_2O_3 was 9 wt.%. X-ray diffraction (XRD) patterns showed that it was formation of Cr_2O_3 crystals that caused a decline in catalyst activity at Cr content above 9 wt.%. Using the optimal Cr_2O_3/γ-Al_2O_3 catalyst, CH_4 was completely oxidized at about 390°C, much lower than the temperature required by noble metal catalysts for the same outcome. The stability of Cr_2O_3/γ-Al_2O_3 was good and was not affected by the reaction temperature, demonstrated by a nearly constant conversion rate of CH4 of 57% at 350°C and 97% at 380°C during a 20 h on-stream test. However, WHSV and inlet concentration of CH4 did affect CH_4 conversion noticeably. For complete oxidation of CH_4, the reaction temperature required increased with WHSV and inlet CH4 concentration.
机译：为了找到最佳催化剂，使用固定床反应器研究了各种负载型过渡金属氧化物催化剂对CH_4的催化焚烧。结果表明，活性物种，载体，金属含量，重时空速（WHSV）和入口CH4浓度都是影响CH4氧化的重要因素。发现Cr_2O_3 /γ-Al_2O_3是所测试的七种γ-Al_2O_3负载的金属氧化物催化剂中活性最高的催化剂。以Cr2O3为活性物质，γ-Al_2O_3最适合测试的六种载体。此外，Cr_2O_3 /γ-Al_2O_3的最佳Cr含量为9重量％。 X射线衍射（XRD）图表明形成Cr_2O_3晶体导致当Cr含量高于9wt。％时催化剂活性下降。使用最佳的Cr_2O_3 /γ-Al_2O_3催化剂，CH_4在约390°C时被完全氧化，远低于贵金属催化剂获得相同结果所需的温度。 Cr_2O_3 /γ-Al_2O_3的稳定性良好，不受反应温度的影响，在20小时的运行测试中，CH4的几乎恒定的转化率在350°C时为57％，在380°C时为97％。 。但是，WHSV和CH4的入口浓度确实显着影响CH_4的转化。对于CH_4的完全氧化，所需的反应温度随WHSV和入口CH4浓度的升高而升高。

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