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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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Ag/SBA-15低温气相选择性催化氧化苯甲醇合成苯甲醛
DOI: 10.1016/S1872-2067(12)60720-7, PP. 108-119
Keywords: 银,SBA-15,低温气相氧化,苯甲醇,苯甲醛
Abstract:
？以SBA-15为载体，采用浸渍法制备了不同Ag含量的Ag/SBA-15，通过N2吸附-脱附、X射线衍射、扫描电子显微镜、高分辨透射电子显微镜、X射线光电子能谱和电感耦合等离子体质谱对催化剂进行了表征。将Ag/SBA-15用于苯甲醇气相选择性催化氧化合成苯甲醛，研究了反应条件对转化率和选择性的影响。结果表明，Ag/SBA-15具有均一的一维孔道结构、较厚的孔壁（3-5nm）及较大的比表面积（411-541m2/g），其规整纳米空间的限域作用使一定负载量的Ag以纳米尺寸均匀分散于介孔SBA-15孔道内，增加了活性组分的比表面积。亲核性氧物种从Ag到SBA-15表面的氧溢流，提高了低温下Ag/SBA-15对苯甲醇气相选择性氧化合成苯甲醛的催化性能。5.3%Ag/SBA-15中的Ag粒径为5-6nm，且均匀分散于载体孔道中，反应温度为220℃时，苯甲醇转化率为87%，苯甲醛选择性为95%；240℃时，苯甲醇转化率和苯甲醛选择性分别高达94%和97%；并在240-300℃范围内，其催化活性和选择性保持不变，表现出了良好的温度耐受能力。催化剂经活化再生可以连续使用40h，选择性基本保持不变。
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