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OALib Journal期刊
ISSN: 2333-9721
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氨浓度对氨蒸发法制备pd-cu/凹凸棒土催化剂常温co氧化性能的影响
, PP. 1076-1082
Keywords: pd-cu/apt,凹凸棒土,氨蒸发法,氨浓度,co常温催化氧化
Abstract:
？以凹凸棒土(apt)作载体,采用氨蒸发法制备了pd-cu/apt催化剂,以co氧化为探针反应,在连续流动微反应装置上,考察了初始氨浓度对催化剂co常温催化氧化性能的影响。通过n2-physisorption、xrd、ft-ir、tem和h2-tpr等手段对催化剂的结构和性质进行了表征。结果表明,在较低或过高氨浓度条件下,制备的pd-cu/apt中cu物种均主要以cuo为主,仅有少量cu2(oh)3cl;适宜的氨浓度有利于稳定cu2(oh)3cl物相的形成,其薄片状的形貌特征、良好的分散状态以及与pd物种间较强的相互作用,显著提高了co催化氧化性能。在空速6000h-1、co体积分数1.5%、水蒸气体积分数3.3%的反应条件下,pd-cu/apt催化剂表现出优异的co室温催化氧化活性和稳定性。
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