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 apparatteknik

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 apparatteknik

Jung Won Woo

Chalmers, Kemi och kemiteknik, Kemiteknik, Kemisk apparatteknik

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

2020-10-23