Ammonia Desorption Peaks Can Be Assigned to Different Copper Sites in Cu/SSZ-13

Leistner Kirsten; Xie Kunpeng; Kumar AshokKamasamudram KrishnaOlsson Louise

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Ammonia Desorption Peaks Can Be Assigned to Different Copper Sites in Cu/SSZ-13

机译：Ammonia Desorption Peaks Can Be Assigned to Different Copper Sites in Cu/SSZ-13

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The purpose of this study is to attribute NH3-TPD peaks observed over Cu/SSZ-13 catalysts to different catalytic sites. This is done by comparing a large number of copper loadings, especially below 40% ion exchange, to be able to see effects relevant to sites in both 6-membered and 8-membered rings. We found that intermediate (200-300 degrees C) and high (400-500 degrees C) temperature NH3-TPD peaks followed similar trends to the copper species in 6-membered and 8-membered rings respectively, as seen by H-2-TPR and NO-DRIFTS. Thus we propose that these two TPD peaks represent ammonia stored on H and Cu sites in 6 and 8-membered rings, respectively. This assignment is further supported by the finding that the intermediate and high temperature NH3-TPD peaks of samples with different Si/Al ratios also follow the same trend. Moreover, we observe that the activation energy for ammonia oxidation is significantly lower for Cu in 6MR compared to Cu in 8MR rings.

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来源
《Catalysis Letters》 |2017年第8期|1882-1890|共9页
作者
Leistner Kirsten; Xie Kunpeng; Kumar AshokKamasamudram KrishnaOlsson Louise;
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作者单位

Chalmers, Competence Ctr Catalysis, Chem Engn, S-41296 Gothenburg, Sweden;

Cummins Inc, 1900 McKinley Ave,MC 50183, Columbus, IN 47201 USA;

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正文语种英语
中图分类催化;
关键词
Copper loading; Cu/SSZ-13; NH3 adsorption; Chabazite; Six-membered rings; Large cages; Si/Al ratio;

Ammonia Desorption Peaks Can Be Assigned to Different Copper Sites in Cu/SSZ-13

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