An investigation of the surface intermediates of H2-SCR of NO  over Pt/H-FER

Yang, Shufang; Wang, Xinping; Chu, Wenling; Song, Zhitang; Zhao, Shuai

doi:10.1016/j.apcatb.2011.08.001

Cited by 40 publications

(18 citation statements)

References 24 publications

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“…Moreover, a previous study showed that the content of O 2 was a crucial parameter for the H 2 -SCR reaction (Yang et al 2011; Yuan et al 2013). The combustion of fuel was not sufficient in the old burners, which resulted in the high oxygen content of 6∼12 %.…”

Section: Resultsmentioning

confidence: 99%

Highly selective catalytic reduction of NO via SO2/H2O-tolerant spinel catalysts at low temperature

Cai

Sun

et al. 2016

Environ Sci Pollut Res

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Selective catalytic reduction of NOX by hydrogen (H2-SCR) in the presence of oxygen has been investigated over the NiCo2O4 and Pd-doped NiCo2O4 catalysts under varying conditions. The catalysts were prepared by a sol-gel method in the presence of oxygen within 50–350 °C and were characterized using XRD, BET, EDS, XPS, Raman, H2-TPR, and NH3-TPD analysis. The results demonstrated that the doped Pd could improve the catalyst reducibility and change the surface acidity and redox properties, resulting in a higher catalytic performance. The performance of NiCo1.95Pd0.05O4 was consistently better than that of NiCo2O4 within the 150–350 °C range at a gas hourly space velocity (GHSV) of 4800 mL g−1 h−1, with a feed stream containing 1070 ppm NO, 10,700 ppm H2, 2 % O2, and N2 as balance gas. The effects of GHSV, NO/H2 ratios, and O2 feed concentration on the NO conversion over the NiCo2O4 and NiCo1.95Pd0.05O4 catalysts were also investigated. The two samples similarly showed that an increase in GHSV from 4800 to 9600 mL h−1 g−1, the NO/H2 ratio from 1:10 to 1:1, and the O2 content from 0 to 6 % would result in a decrease in NO conversion. In addition, 2 %, 5 %, and 8 % H2O into the feed gas had a slightly negative influence on SCR activity over the two catalysts. The effect of SO2 on the SCR activity indicated that the NiCo1.95Pd0.05O4 possesses better SO2 tolerance than NiCo2O4 catalyst does.Graphical abstractThe NiCo1.95Pd0.05O4 catalyst achieved over 90 % NO conversion with N2 selectivity of 100 % in the 200∼250 °C range than the maximum 40.5 % NO conversion over NiCo2O4 with N2 selectivity of approximately 80 % in 350 °C.

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Section: Resultsmentioning

confidence: 99%

Highly selective catalytic reduction of NO via SO2/H2O-tolerant spinel catalysts at low temperature

Cai

Sun

et al. 2016

Environ Sci Pollut Res

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“…At the same time, H 2 conversion over the catalyst was decreased from 82.5% to 60%. The catalytic performance change of the Pt/Z catalyst caused by the NO 2 concentration increasing in the feed gas mixture is analogous to that of the Pt/H-FER catalyst [6], indicating that NO 2 is unfavorable for the H 2 -SCR over the catalyst. Noticeably, for the Pt-1W/Z catalyst, although the activity suppression caused by the NO 2 concentration increasing was also considerably large at lower temperature, it was almost negligible above 120°C.…”

Section: Resultsmentioning

confidence: 92%

“…Cr as additive (to Pt/ZSM-35) promoted the formation of charged NO d+ and NO species on Pt, and hence enhanced the H 2 -SCR activity [1]. In our previous study, we found that NO 2 and nitrate species were not essential intermediates for H 2 -SCR over Pt/H-FER [6], while no report has been found about the way of inhibiting the formation of unfavorable nitrate species. The H 2 -SCR activity of the catalysts was reported to be enhanced by some additives due to their function of increasing the sites anchoring NH x or NH 4 + .…”

Section: H I G H L I G H T Smentioning

confidence: 94%

“…Over 0.5 wt.%Pt/ZSM-35 [1], 80.5% NO x conversion was obtained at 80,000 h À1 for the feed gas 1000 ppm NO + 5000 ppm H 2 + 6.7% O 2 /He. Over 0.5 wt.%Pt/H-FER [6], 87.9% NO x conversion was obtained for the feed gas 910 ppm NO + 90 ppm NO 2 + 5000 ppm H 2 + 10% O 2 /N 2 at 36,000 h À1 . As the metallic Pt (Pt 0 ) is the active site [5,7,8] and the catalyst with a higher Pt loading amount is favorable for Pt presenting the metallic state, the Pt catalysts with higher Pt loading are more active for the reaction.…”

Section: H I G H L I G H T Smentioning

confidence: 99%

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Promotion effect of tungsten on the activity of Pt/HZSM-5 for H2-SCR

Zhang

Wang

Zhao

et al. 2015

Chemical Engineering Journal

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“…Before the introduction of NH 3 -SCR, hydrogen was used industrially to reduce NO X over precious-metal catalysts at low temperature. This has recently received increasing attention [24,25].…”

Section: Introductionmentioning

confidence: 99%

Selective catalytic oxidation of ammonia by nitrogen oxides in a model synthesis gas

Tunå

Brandin

2013

Fuel

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PostprintThis is the accepted version of a paper published in Fuel. This paper has been peer-reviewed but does not include the final publisher proof-corrections or journal pagination.Citation for the original published paper (version of record):Tuna, P., Brandin, J. (2013) Selective catalytic oxidation of ammonia by nitrogen oxides in a model synthesis gas. Fuel AbstractSynthesis gas generated by the gasification of nitrogen-containing hydrocarbons will contain ammonia. This is a catalyst poison and elevated levels of nitrogen oxides (NO X ) will be produced if the synthesis gas is combusted. This paper presents a study of the selective oxidation of ammonia in reducing environments. The concept is the same as in traditional selective catalytic reduction, where NO X are removed from flue gas by reaction with injected ammonia over a catalyst. Here, a new concept for the removal of ammonia is demonstrated by reaction with injected NO X over a catalyst. The experiments were carried out in a model synthesis gas consisting of CO, CO 2 , H 2 , N 2 and NH 3 /NO X . The performance of two catalysts, V 2 O 5 /WO 3 /TiO 2 and H-mordenite, were evaluated. On-site generation of NO X by nitric acid decomposition was also investigated and tested. The results show good conversion of ammonia under the conditions studied for both catalysts, and with on-site generated NO X .

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An investigation of the surface intermediates of H2-SCR of NO over Pt/H-FER

Cited by 40 publications

References 24 publications

Highly selective catalytic reduction of NO via SO2/H2O-tolerant spinel catalysts at low temperature

Highly selective catalytic reduction of NO via SO2/H2O-tolerant spinel catalysts at low temperature

Promotion effect of tungsten on the activity of Pt/HZSM-5 for H2-SCR

Selective catalytic oxidation of ammonia by nitrogen oxides in a model synthesis gas

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