The effects of hydrogen on the efficiency of NO x reduction via hydrocarbon-selective catalytic reduction (HC-SCR) at low temperature using various reductants

Gu, Hyerim; Chun, Kwang Min

doi:10.1016/j.ijhydene.2015.05.070

Cited by 43 publications

(13 citation statements)

References 24 publications

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“…In comparison, hydrocarbons (HC) like C 2 H 4 and C 3 H 8 have high reducibility, low cost and user‐friendliness, and would not cause ammonia sulphate deposits in HRSG. Recent research has shown that hydrocarbon reductants could offer good performance for deNO X activity …”

Section: Introductionmentioning

confidence: 99%

Deactivation mechanism of activated carbon supported copper oxide SCR catalysts in C₂H₄ reductant

et al. 2019

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Current state‐of‐the‐art NH3‐SCR technology based on vanadium catalysts suffers problems associated with NH3 slip and poisoning of the catalyst and blockage of heat recovery steam generators (HRSG). If environmentally‐friendly catalysts capable of efficient operation at lower temperatures could be developed that used a reductant other than NH3, the issues with current state‐of‐the‐art SCR could be significantly lessened. Hence, in this study, activated carbon (AC) supported copper oxide‐based catalysts for SCR while using C2H4 as a reductant was discussed. Reaction testing of catalysts demonstrated high initial NO conversion with steeply declining activity over 2 h of testing when C2H4 was used as the reductant; in comparison, with the same catalyst and NH3 as the reductant, stable, long‐term NO conversion was achieved, but at a lower rate than the initial reactivity with C2H4. As a consequence, catalyst characterization studies were performed to assess deactivation mechanisms when C2H4 was the reductant. These studies included x‐ray diffraction, BET surface area and porosity, temperature programmed reduction, scanning electron microscopy, Raman spectroscopy and x‐ray photoelectron spectroscopy of both fresh and deactivated catalysts. The analytical results showed the surface area and porosity of the catalyst remained unchanged and the initially highly‐dispersed Cu species became agglomerated and more crystalline during reaction testing. Furthermore, carbon black was also detected on the catalyst surface after testing, presumably formed during the decomposition of C2H4. Both agglomeration of the active Cu species and blockage by carbon deposits would decrease the availability of active sites and lead to decreased catalytic activity.

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Section: Introductionmentioning

confidence: 99%

Deactivation mechanism of activated carbon supported copper oxide SCR catalysts in C₂H₄ reductant

et al. 2019

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“…Since its temperature is lower than behind the heat exchanger 6, this provides increased efficiency of the whole condenser unit. Excess condensate is removed into the neutralization tank 8 [1]. Fig.…”

Section: Technology Overviewmentioning

confidence: 99%

“…Such research papers study the problem of reducing the concentration of the hazardous substances [1,2] and increasing equipment efficiency [3][4][5]. One important aspect of industrial impact on the environment is the air dispersion of produced hazardous substances using chimney stacks, which enables lower their ground-level concentration.…”

Section: Introductionmentioning

confidence: 99%

Research of the Influence of Flue Gas Parameter Changes on Air Dispersion Processes of Hazardous Substances

Ionkin¹,

Рагуткин²,

Roslyakov³

et al. 2016

DAAAM Proceedings

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The article describes a promising technology of flue gas heat recovery for natural gas-powered boilers and presents the result of calculating air dispersion of hazardous emissions from chimney stacks on specific power plants. Following power plants were chosen for computational research: MPEI CHPP (Moscow) and peak-backup power plant PRK (Tomsk). The paper concludes that prior to the installation of condenser units preliminary computation of hazardous emissions dispersion is needed.

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“…Among these methods, NSR usually requires a large amount of fuel to create a reductive atmosphere. LNT is relatively simple and efficient, but it needs expensive platinum group metal (PGM) (Herreros et al, 2014;Gu et al, 2015;Raptotasios et al, 2015;Seo et al, 2015;Wang et al, 2015;). SCR is considered to be the most efficient technology due to its high efficiency, selectivity and economy, and becomes the leading NOx control strategy for decades (Shakya et al, 2015;.…”

Section: Introductionmentioning

confidence: 99%

Effects of V2O5 and WO3 loadings on the catalytic performance of V2O5-WO3/TiO2 catalyst for SCR of NO with NH3

2017

Global NEST Journal

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V2O5-WO3/TiO2 catalysts were fabricated by a simple impregnation method. Effects of V2O5 and WO3 loadings on the catalytic performance of V2O5-WO3/TiO2 catalyst for selective catalytic reduction (SCR) of NO with NH3 were investigated. Morphology and structure of the V2O5-WO3/TiO2 catalysts were characterised by XRD, SEM, XPS, and N2 adsorption techniques. The XRD patterns of the V2O5-WO3/TiO2 catalyst are indexed to anatase-TiO2. XPS spectra analysis confirms that V, Ti, W and O species exist on the surface of V2O5-WO3/TiO2 catalyst. V2O5 species are the main active sites in the process of SCR reaction. Increasing V2O5 loading in the V2O5-WO3/TiO2 catalysts can improve their catalytic performance. Exceeding 2 wt%, the catalytic performance of V2O5-WO3/TiO2 catalyst begins to decline because high V2O5 loading on TiO2 speeds up the growth of anatase grains, which leads to the loss of catalytic activity. Appropriate WO3 species can significantly improve the catalytic performance of V2O5-WO3/TiO2 catalysts. However, as the WO3 loadings reaches 6 wt%, NO conversion decreases instead.

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The effects of hydrogen on the efficiency of NO x reduction via hydrocarbon-selective catalytic reduction (HC-SCR) at low temperature using various reductants

Cited by 43 publications

References 24 publications

Deactivation mechanism of activated carbon supported copper oxide SCR catalysts in C₂H₄ reductant

Deactivation mechanism of activated carbon supported copper oxide SCR catalysts in C₂H₄ reductant

Research of the Influence of Flue Gas Parameter Changes on Air Dispersion Processes of Hazardous Substances

Effects of V2O5 and WO3 loadings on the catalytic performance of V2O5-WO3/TiO2 catalyst for SCR of NO with NH3

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The effects of hydrogen on the efficiency of NO x reduction via hydrocarbon-selective catalytic reduction (HC-SCR) at low temperature using various reductants

Cited by 43 publications

References 24 publications

Deactivation mechanism of activated carbon supported copper oxide SCR catalysts in C2H4 reductant

Deactivation mechanism of activated carbon supported copper oxide SCR catalysts in C2H4 reductant

Research of the Influence of Flue Gas Parameter Changes on Air Dispersion Processes of Hazardous Substances

Effects of V2O5 and WO3 loadings on the catalytic performance of V2O5-WO3/TiO2 catalyst for SCR of NO with NH3

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Deactivation mechanism of activated carbon supported copper oxide SCR catalysts in C₂H₄ reductant

Deactivation mechanism of activated carbon supported copper oxide SCR catalysts in C₂H₄ reductant