采用化学还原法制备了不同Sn/Pd摩尔比的碳纳米管(CNTs)负载Pd/SnO2催化剂,并将该催化剂用于邻氯硝基苯(o-CNB)的选择加氢反应.采用透射电镜、X射线衍射和电感耦合等离子体技术对所制备的Pd/SnO2/CNTs催化剂进行了表征.结果表明,Sn/Pd摩尔比对该催化剂的邻氯硝基苯选择加氢反应性能影响显著.当Sn/Pd摩尔比为11时,催化剂的活性最高,在常压,60℃反应60 min,o-CNB转化率为96%.该催化剂还具有高的邻氯苯胺(o-CAN)选择性,o-CNB转化率达到100%时,脱氯副产物苯胺选择性小于5%.在相同条件下,浸渍法制备的2.4%Pd/CNTs催化剂上脱氯副反应严重,当o-CNB完全转化时,o-CAN选择性只有22%,副产物苯胺选择性则高达78%.
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