A deactivation mechanism study of phosphorus-poisoned diesel oxidation catalysts: Model and supplier catalysts
Artikel i vetenskaplig tidskrift, 2020

The effect of phosphorus poisoning on the catalytic behavior of diesel oxidation catalysts was investigated over model and supplier monolith catalysts, i.e., Pd-Pt/Al2O3. The results of ICP and XPS from the vapor-phase poisoning over model catalysts suggested that the temperature of phosphorus poisoning affects both the overall content of phosphorus and the dispersion of phosphorus (i.e., inlet/outlet and surface/bulk). Phosphorus oxide (P2O5), metaphosphate (PO3-), and phosphate (PO43-) were identified in the poisoned model and supplier catalysts. The distribution of these species on poisoned model catalysts was highly dependent on the poisoning temperature, i.e., a higher temperature resulted in a higher concentration of PO43-. The outlets of the monoliths contained more PO43- and less P2O5 than the inlets. Both active sites and surface OH groups on model and supplier catalysts were contaminated upon phosphorus poisoning. It is found that PO43- had a stronger influence on the active sites than P2O5. One significant finding in this study is that the vapor-phase phosphorus poisoning could be a practical and cost efficient approach to simulate an accelerated aging/poisoning process.

Författare

Aiyong Wang

Chalmers, Kemi och kemiteknik, Kemiteknik, Kemisk apparat- och reaktionsteknik

Jihao Wang

Chalmers, Kemi och kemiteknik

Sahil Sheti

Chalmers, Kemi och kemiteknik

Sandra Dahlin

Kungliga Tekniska Högskolan (KTH)

Joonsoo Han

Chalmers, Kemi och kemiteknik, Kemiteknik, Kemisk apparat- och reaktionsteknik

Jung Won Woo

Chalmers, Kemi och kemiteknik, Kemiteknik, Kemisk apparat- och reaktionsteknik

Kunpeng Xie

Volvo Cars

Lars Pettersson

Kungliga Tekniska Högskolan (KTH)

Louise Olsson

Chalmers, Kemi och kemiteknik, Kemiteknik

Catalysis Science and Technology

2044-4753 (ISSN) 2044-4761 (eISSN)

Vol. 10 16 5602-5617

Ämneskategorier

Kemiska processer

Annan kemiteknik

Annan kemi

DOI

10.1039/d0cy00589d

Mer information

Senast uppdaterat

2021-02-08