A deactivation mechanism study of phosphorus-poisoned diesel oxidation catalysts: model and supplier catalysts. Issue 16 (24th July 2020)

• Record Type: Journal Article
• Authors: Wang, Aiyong; Wang, Jihao; Sheti, Sahil; Dahlin, Sandra; Han, Joonsoo; Woo, Jungwon; Xie, Kunpeng; Pettersson, Lars J.; Olsson, Louise
• Is Part Of: Catalysis science & technology. Volume 10:Issue 16(2020)
• Page Start: 5602
• Page End: 5617
• Publication Date: 2020-07-24
• Subjects: Catalysis -- Periodicals; 541.395
• DOI: 10.1039/d0cy00589d
• Languages: English
• ISSNs: 2044-4753

Abstract

Abstract : 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/Al2 O3 . Abstract : 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/Al2 O3 . 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 (P2 O5 ), metaphosphate (PO3 − ), and phosphate (PO4 3− ) 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 PO4 3− . The outlets of the monoliths contained more PO4 3− and less P2 O5 than the inlets. Both active sites and surface OH groups on model and supplier catalysts were contaminated upon phosphorus poisoning. It is found that PO4 3− had a stronger influence on the active sites than P2 O5 . 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.