新型反相微乳液制备纳米结构甲烷催化燃烧催化剂La0.95Ba0.05MnAl11O19-α的研究

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提出一种由水,异丙醇,正丁醇组成的新型微乳液,并以其为反应介质制备了甲烷高温燃烧La0.95Ba0.05MnAl11O19-催化剂.采用1H NMR,FT-IR,电导法及激光粒度散射法研究了新型微乳液中水的结构及相特性.新型微乳液中水的体积分数小于一定值时,电导率与水含量成非线性关系,k~ψ曲线上存在一临界值(ψP=0.15).水质子的化学位移随水含量的降低移向高场.加入4%D2O测定的O-D键的伸缩振动随水含量增加而向高波数方向移动.异丙醇铝在新型微乳液中水解形成的Al(OH)3胶体粒子的粒径范围为226~329 nm.采用新型微乳液作为反应介质制备的Ba0.05La0.95MnAl11O19-α催化剂的粒径在30 nm,明显小于纯水制备的样品(100 nm).BET比表面积为65m2/g,比纯水制备样品高出约一倍.XRD结果显示,1200℃焙烧10 h即可获得含单一β-Al2O3相的催化剂.Ba0.05La0.95MnAl11O19-α催化剂甲烷催化燃烧的T10为420℃,比纯水制备样品下降了90℃.甲烷催化燃烧活性提高是由于含有较多Mnn+纳米结构六铝酸盐的形成.
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