Deposition of ammonium bisulfate in the selective catalytic reduction of nitrogen oxides with ammonia

Matsuda, Shimpei; Kamo, Tomoichi; Kato, Akira; Nakajima, Fumito; Kumura, T.; Kuroda, Hiroshi

doi:10.1021/i300005a009

Cited by 104 publications

(55 citation statements)

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“…It is well known [7,8] that the deactivation of SCR catalysts in the presence of SO 2 at low temperatures is primarily due to the blocking and filling of catalyst pores caused by the formation of ammonium sulfate compounds such as (NH 4 ) 2 SO 4 and NH 4 HSO 4 on the catalyst. Since these ammonium salts are formed by an equilibrium reaction among NH 3 , SO 3 and H 2 O, the higher concentrations of NH 3 and SO 3 and lower temperatures favor the formation of these ammonium salts.…”

Section: Sulfur Tolerance Of V 2 O 5 /Tsm Catalystsmentioning

confidence: 99%

“…Therefore, for commercial use, any catalysts employed for the low-temperature SCR process should be highly resistant to poisoning caused by SOx present in flue gases. It is well known [7,8] that SOx poisoning at low temperatures is due to deactivating agents, ammonium salts produced by the reaction of SO 3 generated from the oxidation of SO 2 with ammonia over the SCR catalyst. Therefore, the inhibition of the oxidation of SO 2 to SO 3 plays a critical role in the improvement of resistance to SOx poisoning at lower temperatures.…”

Section: Introductionmentioning

confidence: 99%

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Low temperature selective catalytic reduction of NO by NH3 over V2O5 supported on TiO2–SiO2–MoO3

2006

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The V 2 O 5 catalysts supported on TiO 2 -SiO 2 -MoO 3 (TSM) prepared by the coprecipitation method were investigated for the selective catalytic reduction (SCR) of NO by NH 3 at low temperatures. The V 2 O 5 /TSM catalyst with 7-13 wt% SiO 2 was found to exhibit a superior SCR activity and a good sulfur tolerance at low temperatures (<250°C). The presence of highly active polymeric vanadates formed by the incorporation of MoO 3 to TiO 2 -SiO 2 and superior redox properties seems to enhance SCR activity, and furthermore the very lower SO 2 oxidation activity due to the higher acidity leads to the remarkable improvement of sulfur tolerance.

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Section: Sulfur Tolerance Of V 2 O 5 /Tsm Catalystsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Low temperature selective catalytic reduction of NO by NH3 over V2O5 supported on TiO2–SiO2–MoO3

2006

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“…This indicates that for the sulfated CuO/HC-Al, SO 2 has a little inhibition effect on SCR of NO with NH 3 . Serious or complete deactivation by SO 2 to the SCR reaction was observed on CuO/Al 2 O 3 [15], V 2 O 5 /Al 2 O 3 [11,16] and MnO X /Al 2 O 3 catalysts [10] at temperatures below 300°C, which were attributed to pore plugging resulted from the formation of ammonium (bi)sulfates [11,15] or Al 2 (SO 4 ) 3 [16] or MnSO 4 [10]. However, at 400°C (figure 2), deposition of ammonium (bi)sulfates is not possible.…”

Section: Effect Of Gas Phase Somentioning

confidence: 97%

“…Since resistance to SO 2 is always a key factor in developing SCR catalyst and many catalysts [8][9][10][11] are deactivated by SO 2 , the attention of this note focuses on the effect of SO 2 on SCR activity of the novel honeycomb catalyst.…”

Section: Introductionmentioning

confidence: 99%

Effect of SO2 on a cordierite honeycomb supported CuO catalyst for NO reduction by NH3

Liu

Xie

et al. 2005

Catal Lett

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Supporting CuO on a Al 2 O 3 -coated cordierite honeycomb yields a good catalyst (CuO/HC-Al) for selective catalytic reduction (SCR) of NO with NH 3 at 350-500°C. SO 2 has complex effects on the catalyst's activity. It significantly promotes the SCR activity through conversion of CuO to CuSO 4 , however, when a certain amount of CuO is converted, it slightly decreases the SCR activity through competitive adsorption with NH 3 . This competitive adsorption reduces the amount of NH 3 adsorbed on the catalyst surface, especially on the sites highly active to the SCR. It also prevents transformation of CuO to CuSO 4 and as a result, the catalysts subjected to pre-sulfation and in situ sulfation show different SCR behaviors.

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“…concentrations are on the order of 2 -5% of the total SOX (sulfur dioxide (S02) and sulfur trioxide (SO3)) concentrations [51]. SO3 may react with ammonia and form ABS, thus causing corrosion and flow blockage problems; and In this process, activated carbon or coke is used as the catalyst.…”

Section: Ocmentioning

confidence: 99%

The development of coal-based technologies for Department of Defense facilities. Volume 1, Technical report. Semiannual technical progress report, September 28, 1994--March 27, 1995

Miller¹,

Bartley²,

Hatcher

1996

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, has initiated a three-phase program with the Consortium for CoalWater Mixture Technology, with the a i m of decreasing DODs reliance on imported oil by increasing its use of coal. The program is being conducted as a cooperative agreement between the Consortium and DOE.Activities this reporting period are summarized by phase.Phase I is nearly completed. During this reporting period, coal beneficiatiodpreparation studies, engineering designs and economics for retrofitting the Crane, Indiana boiler to f i e coalbased fuels, and a 1,000-hour demonstration of dry, micronized coal were completed. In addition, a demonstration-scale micronized-coal water mixture (MCWM) preparation circuit was constructed and a 1,000-hour demonstration f k n g MCWM began. Preparation of the Phase I final report has started. PHASE I1 PHASE IWork in Phase II focused on emissions reductions, coal beneficatiodpreparation studies, Emissions reductions investigations involved literature surveys of NOx, S02, trace metals, and economic analyses of coal use.volatile organic compounds, and fine particulate matter capture. In addition, vendors and engineering firms were contacted to identify the appropriate emissions technologies for the installation of commercial NOx and SO2 removal systems on the demonstration boiler. Information from the literature surveys and engineering firms will be used to identify, design, and install a control system(s). preparation procedures, and on the development of advanced processes for beneficiating high ash, high sulfur coals.Work also continued on determining the basic cost estimation of boiler retrofits, and evaluating environmental, regulatory, and regional economic impacts. In addition, the feasibility of technology adoption, and the public's perception of the benefits and costs of coal usage was studied. A coal market analysis was completed. PHASE I11Work continued on the refmement and optimization of coal grinding and MCWM Work in Phase I I I focused on coal preparation studies, emissions reductions, and economic Coal preparation studies were focused on specific coal-cleaning options and their associated analyses of coal use.ancillary operations and integration of processingkleaning operations for overall system optimization.Emissions reductions investigations included algal studies for trace metal capture and C02 uptake.The economic study focused on determining cost and market penetration, selection of incentives, and regional economic impacts of coal-based fuel technologies. In addition DODs fuel mix is being determined and a national energy portfolio is being constructed. 9.1 9.2 9.3 9.4 9.5 9.6 9.7 9.8 9.9 9.10 r . I... ' 7 . .-. L I LIST OF FIGURESFIGURE 1-1. FIGURE 1-2. FIGURE 1-3. FIGURE 2-1. FIGURE 2-2 FIGURE 2-3 FIGURE 2-4 FIGURE 2-5 mGURE 2-6 FIGURE 2-7 FIGURE 2-8 FIGURE 2-9 FIGURE 3-1.FIGURE 3-2.FIGURE 3-3. HGURE [3][4][5][6][7][8][9][10][11] FIGURE 3-31 FIGURE 7-1 FIGURE 7-2 FIGURE 7-3 FIGURE 7-4 FIGURE 7-5 FIGURE 7-6 FIGURE 7-7 FIGURE 7-8 FIGURE 7-9 FIGURE 7-10 FIGURE 7-1 1...

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Deposition of ammonium bisulfate in the selective catalytic reduction of nitrogen oxides with ammonia

Cited by 104 publications

References 1 publication

Low temperature selective catalytic reduction of NO by NH3 over V2O5 supported on TiO2–SiO2–MoO3

Low temperature selective catalytic reduction of NO by NH3 over V2O5 supported on TiO2–SiO2–MoO3

Effect of SO2 on a cordierite honeycomb supported CuO catalyst for NO reduction by NH3

The development of coal-based technologies for Department of Defense facilities. Volume 1, Technical report. Semiannual technical progress report, September 28, 1994--March 27, 1995

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