以介孔SBA-15分子筛为载体,用等体积共浸渍法制备了不同Cu/Co比和不同Cu-Co含量的Cu-Co/SBA-15催化剂,用N2吸附-脱附、高分辨透射电镜、X射线衍射、X射线光电子能谱和程序升温还原等手段对催化剂进行了表征,并在微型定床反应器上评价了催化剂催化甲苯燃烧性能.结果表明,所有催化剂仍具有SBA-15分子筛的介孔结构,Cu含量较低时催剂中存在Cu-Co-O固溶体,Cu含量较高时会形成CuO.催化剂表面的Co对甲苯催化燃烧有重要的作用,催化剂中的Cu可降低Co的还原温度,从而有利十催化剂活性的提高.40%(Cu_(0.25)Co_(0.75))/SBA-15催化剂具有最高的活性,在285℃时可完全化燃烧消除甲苯.
A series of Cu-Co/SBA-15 catalyst samples with different Cu/Co ratios and Cu-Co contents were prepared by co-impregnation.The structure of the catalyst samples was characterized by N2 adsorption-desorption, high resolution transmission electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, and temperature-programmed reduction. The catalytic performance of the catalyst for toluene combustion was evaluated in a fixed-bed microreactor. The results indicated that the mesoporous structure of SBA-15 zeolite was maintained in all the catalyst samples. There were the Cu-Co-O solid solution phase in the samples with low Cu content and the CuO phase in the sampies with high Cu content. The Co on the catalyst surface played an important role in toluene combustion. The Cu could decrease the reduction temperature of Co species and promote the catalyst activity. Among all the catalyst samples, 40%(Cu_(0.25)Co_(0.75))/SBA-15 had the highest catalytic activity for toluene combustion, and toluene could be completely combusted at 285℃.
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