【摘要】：煤礦乏風(fēng)中含有大量極低濃度甲烷,開發(fā)利用乏風(fēng)中甲烷是世界性重要研究課題,催化氧化法是最具開發(fā)潛力的技術(shù)。本文研究制備新型催化劑,進行相關(guān)理論與實驗研究,為煤礦通風(fēng)瓦斯利用催化劑的開發(fā)和應(yīng)用提供了必要的理論指導(dǎo)和實驗基礎(chǔ)。本文采用溶膠-凝膠法合成具有豐富表面積和特定形貌及結(jié)構(gòu)的新型多孔氧化鋁材料,并以其為載體,選取Ce、 Zr、La為助劑,采用熱吸附法和浸漬法,制備得到新型的同時具有介孔和微米級大孔的貴金屬Pd/Al2O3和非貴金屬復(fù)合物Cu-Mn/Al2O3整體式催化劑,利用XRD、SEM、氮氣吸附-脫附等手段進行物化性質(zhì)表征,模擬煤礦乏風(fēng),通過探針實驗評價催化劑催化氧化活性。通過物化性質(zhì)表征分析研究助劑和活性組分的生長規(guī)律,經(jīng)過優(yōu)化分析,制備得到不同活性組分、助劑負載量的新型催化劑,研究得出載體、助劑和活性組分對所合成催化劑的甲烷催化氧化活性的影響規(guī)律和作用機理。當(dāng)CH4體積百分數(shù)為1%,反應(yīng)氣體空速為6000h-1時,所合成貴金屬2%Pd/Al2O3和非貴金屬復(fù)合物0.5MCu-Mn/Al2O3整體式催化劑的起燃溫度分別只有227C和314℃。
[Abstract]:There are a lot of very low concentration methane in coal mine exhaust wind. The development and utilization of methane in exhaust wind is an important research topic in the world, and catalytic oxidation is the most potential technology. In this paper, the preparation of new catalysts is studied, and the related theoretical and experimental studies are carried out, which provides the necessary theoretical guidance and experimental basis for the development and application of catalysts for ventilation gas utilization in coal mines. In this paper, a new type of porous alumina material with rich surface area, specific morphology and structure was synthesized by sol-gel method. Using it as carrier, Ce, Zr,La as auxiliary, thermal adsorption and immersion method. A new type of noble metal Pd/Al2O3 and non-noble metal complex Cu-Mn/Al2O3 integral catalysts with both mesoporous and micron macropores were prepared and characterized by XRD,SEM, nitrogen adsorption and desorption. The catalytic oxidation activity of the catalyst was evaluated by probe experiment. The growth law of auxiliaries and active components was studied by characterization and analysis of physical and chemical properties. Through optimization analysis, a new type of catalysts with different active components and auxiliaries loading were prepared, and the supports were obtained. The effect of auxiliaries and active components on the catalytic oxidation activity of methane was studied. When the volume percentage of CH4 is 1% and the space velocity of reaction gas is 6000 h ~ (- 1), the ignition temperature of noble metal 2%Pd/Al2O3 and non-precious metal complex 0.5MCu-Mn/Al2O3 integrated catalyst is only 227C and 314C, respectively.
【學(xué)位授予單位】：中國礦業(yè)大學(xué)（北京）
【學(xué)位級別】：博士
【學(xué)位授予年份】：2013
【分類號】：TQ426;TD712

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