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环境化学  2015 

碱金属改性Pd/γ-Al2O3催化剂三效性能的研究

Keywords: 碱金属,,催化剂,起燃活性,电负性

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Abstract:

考察了碱金属对氧化铝负载钯催化剂的改性作用,发现钾的作用最为明显,其三效起燃温度可降低50℃以上.在氧化还原数S=1.0和5=1.5两种条件下进行对比,表明碱金属的掺入可以拓宽催化剂的操作窗口.低电负性碱金属的掺入,一方面增强了电负性物种CO,NO和O2的吸附能力,同时减弱了电正性物种C3H6的吸附能力,另一方面,削弱了吸附态分子NO中N-O键的键能,促进其解离,抑制了N2O的生成.

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