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OALib Journal期刊
ISSN: 2333-9721
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氧化铝载体对pt-sn-k/γ-al2o3催化剂上异丁烷脱氢性能的影响
, PP. 1481-1487
Keywords: 氧化铝载体,pt-sn-k/&gamma,-al2o3,异丁烷,脱氢,盐酸回流法,氨水沉淀法
Abstract:
？采用盐酸回流法和氨水沉淀法合成了氧化铝载体，并通过络合真空浸渍法制备了不同来源氧化铝负载的pt-sn-k/γ-al2o3催化剂。利用n2物理吸附、co脉冲吸附、h2程序升温还原、nh3程序升温脱附、热重等手段对pt-sn-k/γ-al2o3催化剂进行了表征，以异丁烷脱氢为探针反应研究了氧化铝载体对该催化剂脱氢性能的影响。结果表明，与由盐酸回流法合成的载体制备的催化剂相比，采用氨水沉淀法合成的氧化铝载体制备的pt-sn-k/γ-al2o3催化剂表面具有较小的pt颗粒和较弱的酸性分布，其脱氢活性及异丁烯选择性更优。14d的连续运行数据显示，由氨水沉淀合成的载体制备的催化剂，其抗积炭能力更强，反应后催化剂的积炭石墨化程度更低，因而具有更好的稳定性；在该催化剂上，异丁烷初始转化率为56.67%，14d后仍能达到34.71%，异丁烯初始选择性为80%，7d后维持在94%左右。
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