The Influence of Phosphorus Exposure on a Natural-Gas-Oxidation Catalyst
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Phosphorus is found to have a deactivating effect on the catalytic activity of the studied natural-gas-oxidation catalyst. Accelerated laboratory-scale phosphorus treatment was done to the PtPd/Al2O3 natural gas oxidation catalyst. The effect of phosphorus after low (0.065 M) and high (0.13 M) phosphorus concentration treatments was studied by using an inductively coupled plasma optical emission spectroscopy, N2 physisorption, X-ray diffraction, field emission scanning electron microscopy, transmission electron microscopy, and X-ray photoelectron spectroscopy. In addition, the behavior of the catalyst was studied by a Gasmet FT-IR gas analyzer. Based on the received results it can be concluded that phosphorus was adsorbed on the surface by chemical bonds forming phosphates (PO4). In addition, the partial transformation of PdO to Pd was observed. Due to the phosphorus adsorption both the CO and CH4 oxidation activities were lower after the phosphorus treatments compared with the fresh catalyst.
KeywordsMethane degradation Palladium Platinum Poisoning
Financial support from the Academy of Finland (Project 139187) is gratefully acknowledged. F. Cumming is acknowledged for his contributions to the experimental work.
- 22.PDF-2 Powder Diffraction File Database International Centre of Diffraction Data, 12 Campus Boulevard Newton Square, PA 19073-3273, USA [PDF cards: 70-4689 (AlPO4), 43-1024 (PdO) and 65-6174 (Pd)]Google Scholar
- 24.Naumkin AV, Kraut-Vass A, Gaarenstroom SW, Powell CJ (2012) NIST X-ray photoelectron spectroscopy database, National Institute of Standards and Technology. srdata.nist.gov/xpsGoogle Scholar
- 26.Moulder JF, Stickle WF, Sobol PE, Bomben KD (1992) Handbook of X-ray photoelectron spectroscopy. Perkin-Elmer Corporation, Eden PrairieGoogle Scholar