X-ray photoelectron spectroscopy analysis of platinum- and/or cobalt-loaded zeolites relevant for selective catalytic reduction of NOx
✍ Scribed by Boix, A.; Fierro, J. L. G.
- Publisher
- John Wiley and Sons
- Year
- 1999
- Tongue
- English
- Weight
- 118 KB
- Volume
- 27
- Category
- Article
- ISSN
- 0142-2421
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✦ Synopsis
within the cavities of the NaY zeolite have been analysed widely in depth in the bimetallic systems Co-Pd, Ni-Pd, Cu-Pd and Cu-Pt. 2 Also the Pt-Co bimetallic system was investigated by Guczi et al.,11,12 who used on NaY zeolite and high metal contents. However, to our knowledge no similar studies related to the Pt-Co bimetallic system deposited on zeolites such as mordenite, ferrierite and ZSM-5, which have shown high activity in the SCR reaction, have been conducted.
Accordingly, this work was undertaken with the aim of identifying the chemical state and, if possible, the relative abundance of bimetallic Pt-Co, and the corresponding monometallic Pt and Co systems encaged in zeolites, which were prepared by ion exchange and pretreated in different gaseous environments. For this purpose photoelectron spectroscopy was chosen in order to obtain useful information about activity results in the SCR reaction with mixtures of CH 4 C NO C O 2 , either in dry or wet atmospheres.
EXPERIMENTAL
Catalyst preparation
Three commercial synthetic zeolites-Na-ZSM-5 [Na 9 AlO 2 9 SiO 2 87 ], Na-mordenite [Na 7 AlO 2 7 SiO 2 41 ] and K-ferrierite [ Na,K 3.7 AIO 2 3.7 SiO 2 32.3 ] -were used as supports for platinum and cobalt. The bulk Si/Al atomic ratios are shown in Table 1. Monometallic Co-zeolites were prepared by ion exchange using a dilute solution of 0.025 M Co NO 3 2 . The zeolite was suspended