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OALib Journal期刊
ISSN: 2333-9721
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Ni对Pd/Al2O3密偶催化剂催化性能的影响
DOI: 10.1016/S1872-2067(15)60850-6, PP. 994-1000
Keywords: 密偶催化剂,钯,镍,氧化铝,丙烷
Abstract:
？考察了助剂Ni对以改性氧化铝为载体的单Pd密偶催化剂的影响.结果表明,掺杂Ni可以明显改善对C3H8的催化性能,尤其对老化催化剂效果显著.此外,Ni的添加使老化催化剂Pd/Al2O3的起燃温度(T50)和完全转化温度(T90)分别降低31和30℃.单反应测试结果表明,添加Ni能明显提高对C3H8+NO反应的催化性能.采用H2程序升温还原、CO吸附、高倍透射电镜和X射线光电子能谱等手段对新鲜和老化催化剂进行了表征.结果表明,掺杂Ni不仅可以抑制活性组分PdOx的烧结,减少金属态Pd0的产生,而且可以提高PdOx物种的可还原能力和有效比表面积.
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