PtNi alloy nanoparticles
supported on carbon (XC-72) are synthesized via a one-pot synthetic
approach. This synthesized bimetallic composite offers several advantages,
such as reduction of precious Pt along with an increase in activity
due to the modified electronic structure. The prepared PtNi/C catalysts
were employed as catalysts for NO removal both in a fixed-bed reactor
and in a newly designed gas diffusion reactor. The performances of
all prepared PtNi/C catalysts were higher than Pt/C at the same conditions
and maintained a stable NO removal at a wide temperature window (100–300
°C), especially for Pt65Ni35 (more than
95% from 120 to 300 °C). This is attractive for low temperature
SCR technology. According to XPS analysis, the surface layer phase
was comprised of Pt contents with Ni being localized beneath the successive
layers until Ni content increased to 67% mole ratio. The surface presence
of Ni significantly affects the Pt electronic structure and raises
the mass specific activity of Pt. Meanwhile, PtNi/C catalysts were
introduced in a new gas diffusion reactor to remove NO under quantitatively
less catalysts (30 mg), high NO concentration (1000 ppm), and at a
high flow rate (resulting in a very short residence time of 0.09 s)
condition. NO removal reaches almost 100% below 95 °C for all
the PtNi catalysts and among all Pt65Ni35 exhibited
the best performance. In addition, the influence of SO2 on the performance of Pt65Ni35 was also investigated,
and the catalysts exposed a good antipoisonous property. The excellent
performance of PtNi catalysts and a gas diffusion reactor are strongly
recommended for their utilization as highly active and economical
technology for NO removal.
In this paper, Pt supports on carbon black powder (Vulcan XC-72) were synthesized via a hydrothermal method for selective catalytic reduction (SCR) of NO with H in the presence of 2 vol% O over a wide temperature of 20-300 °C. The results showed that the 3 and 5 wt% Pt/C catalysts resulted in high NO conversion (>90 %) over a temperature range of 120 to 300 °C, and the maximum NO conversion of 98.6 % was achieved over 5 wt% Pt/C at 120 °C. Meanwhile, the influence of SO and HO on the catalyst performance of 3 wt% Pt/C was investigated. The catalysts exhibited good SO poisoning resistance when the SO concentration was lower than 260 ppm. Moreover, a positive effect on NO conversion was detected with the addition of 3 and 5 vol% HO in the feed gas stream. Graphical abstract TEM image and good NO conversion performance of the Pt/C catalysts.
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