Experimental research and characteristics analysis of alumina‐supported copper oxide sorbent for flue gas desulfurization

Xiang, Jun; Zhao, Qingsen; Hu, Song; Sun, Lei; Su, Sheng; Fu, Peng; Zhang, Anchao; Qiu, Jianrong; Chen, Hanping; Xu, Minghou

doi:10.1002/apj.39

Cited by 10 publications

(14 citation statements)

References 18 publications

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“…In Fig.2(b), NO formation increases quickly at temperatures above 400 ℃ during ammonia oxidation reaction. This indicates that ammonia is over-oxidized to N 2 (Reaction (1)), but also a small quantity of ammonia is over-oxidized to NO according to Reaction (3). N 2 O is also detected in the outlet (Reaction (2)), and the amount is smaller than that during the SCR reaction.…”

Section: Effect Of Temperature On Catalytic Activity Of Cuo-ceo 2 -Mnmentioning

confidence: 99%

“…The SCR activity as a function of reaction temperature is correlated with the oxidation degree of NH 3 . The equations in the NO-NH 3 -O 2 reaction system are as follows.…”

Section: Effect Of Temperature On Catalytic Activity Of Cuo-ceo 2 -Mnmentioning

confidence: 99%

“…The TPD method was used to test desorption properties of NH 3 and NO on the catalysts. 3.2.1 Desorption properties of NH 3 The NH 3 desorption as a function of operating temperature is shown in Fig.3. There is an obvious NH 3 Fig.3 NH 3 desorption as function of operating temperature desorption peak at 100−150 ℃ for the two samples.…”

Section: Desorption Of Nh 3 and No On Cuo-ceo 2 -Mno X / γ-Al 2 Omentioning

confidence: 99%

“…CuO-CeO 2 -MnO x /γ-Al 2 O 3 3.3.1 Transient response of NH 3 In order to find the role of adsorption with NH 3 and NO in the SCR process the transient process experiments were studied. The transient response process of NH 3 as a function of time is shown in Fig.5.…”

Section: Transient Response Of Nh 3 and No Onmentioning

confidence: 99%

“…To obtain more information about the behaviors of NH 3 and NO in this system, temperature programmed desorption(TPD) method and transient behaviors of catalysts were investigated.…”

Section: Introductionmentioning

confidence: 99%

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Selective catalytic reduction of NO with NH3 over sol-gel-derived CuO-CeO2-MnOx/γ-Al2O3 catalysts

Zhao

Xiang

Sun

et al. 2009

J. Cent. South Univ. Technol.

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Granular CuO-CeO 2 -MnO x /γ-Al 2 O 3 catalysts were synthesized by the sol-gel method. The performance of the CuO-CeO 2 -MnO x /γ-Al 2 O 3 catalysts for the selective catalytic reduction (SCR) was studied in a fixed bed system. Preliminary tests were carried out to analyze the behavior of NH 3 and NO over catalyst in the presence of oxygen. The optimum temperature range for SCR over the CuO-CeO 2 -MnO x /γ-Al 2 O 3 catalysts is 300−400 . The catalysts maintain nearly 100% NO conversion at 350 ℃ . The ℃ NH 3 oxidation experiments show that both NO and N 2 O are produced gradually with the increase of temperature. The catalysts in this experiment have a stronger oxidation property on NH 3 , which improves the denitrification activity at low temperature. The over-oxidation of NH 3 at high temperature is the main cause leading to a decrease in the NO conversion. The NH 3 and NO desorption experiments show that NH 3 and NO can be adsorbed on CuO-CeO 2 -MnO x /γ-Al 2 O 3 granular catalysts. The transient response of NH 3 and NO indicates that the SCR reaction proceeds in accordance with the Eley-Rideal mechanism. The adsorbed NO has little influence on the denitrification activity in SCR process.

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Section: Effect Of Temperature On Catalytic Activity Of Cuo-ceo 2 -Mnmentioning

confidence: 99%

“…The SCR activity as a function of reaction temperature is correlated with the oxidation degree of NH 3 . The equations in the NO-NH 3 -O 2 reaction system are as follows.…”

Section: Effect Of Temperature On Catalytic Activity Of Cuo-ceo 2 -Mnmentioning

confidence: 99%

Section: Desorption Of Nh 3 and No On Cuo-ceo 2 -Mno X / γ-Al 2 Omentioning

confidence: 99%

Section: Transient Response Of Nh 3 and No Onmentioning

confidence: 99%

“…To obtain more information about the behaviors of NH 3 and NO in this system, temperature programmed desorption(TPD) method and transient behaviors of catalysts were investigated.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Selective catalytic reduction of NO with NH3 over sol-gel-derived CuO-CeO2-MnOx/γ-Al2O3 catalysts

Zhao

Xiang

Sun

et al. 2009

J. Cent. South Univ. Technol.

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Decomposition of nitrous oxide over a low‐cost catalyst

Yang

Zhuo

et al. 2010

Asia-Pacific J Chem Eng

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Nitrous oxide (N 2 O) is a significant greenhouse gas and its emissions from fluidized bed combustion systems can be controlled using catalytic conversion and decomposition. The catalytic decomposition of N 2 O was studied in a quartz fixed-bed reactor at 450-700 • C. The low-cost catalyst was prepared from fly ash and iron oxides, and was characterized in terms of the BET specific surface area and XRD. This study showed that both the Fe content on the catalyst surface and the calcination temperature during the preparation of the catalyst should be optimized in order to significantly improve the catalyst performance when used for N 2 O decomposition. The influences of O 2 , H 2 O, CO 2 and SO 2 on the N 2 O decomposition were investigated at the most reactive temperature. Experimental results showed that O 2 had a small negative effect on the catalytic activity, while CO 2 had no obvious effect on the N 2 O decomposition. The N 2 O conversion was still high even when H 2 O was present. However, the N 2 O conversion dropped sharply when H 2 O and O 2 were both present. The catalytic activity was reduced by SO 2 because of its reaction with the catalyst. The difference between the N 2 O conversion with H 2 O present and with both H 2 O and O 2 present was analyzed in order to determine the N 2 O decomposition mechanism. Two mechanisms for the N 2 O catalytic decomposition mechanism have been considered, of which the one with formation of oxygen atoms at two sites with migration and recombination shows better agreement with our experimental results. 

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Chemisorption of hydrogen sulfide on halloysite‐based porous clay heterostructures modified with potassium permanganate

Huang

Kang

2011

Asia-Pacific J Chem Eng

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Hydrogen sulfide gas is harmful to human health and causes corrosion of electronic devices, when it is present in indoor air. Porous clay heterostructures (PCHs) provide a new type of material for catalysis, adsorptive separations and as H 2 S sensors because their large pores allow access to their active interiors. PCHs posses a large adsorptive surface area (400-900 m 2 g −1 ) and a unique combination of micro-and mesoporosity. In this work, PCHs were synthesized by the polymerization of tetraethoxysilane (TEOS) in the micelles, which were assembled by mixing tubular halloysite powders and cetyltrimethylammonium bromide (CTMAB). Both as-synthesized PCHs and pristine halloysite were impregnated with KMnO 4 by equal-volume mixing to obtain chemosorbents. The mass percentages of KMnO 4 ranged from 5 to 30 wt%. The samples were characterized by using N 2 adsorption, X-ray diffraction (XRD), diffuse reflectance ultraviolet-visible (UV-Vis) spectroscopy, transmission electron microscope (TEM) and infrared spectroscopy. The dynamic adsorption of the chemosorbents for hydrogen sulfide was evaluated with a fixed bed. The results show that the PCH-based chemosorbents exhibit better H 2 S breakthrough performance due to their rich porous structure, the samples with 15-20 wt% KMnO 4 possessing the highest activity. This study shows that the KMnO 4 /PCH chemosorbents can effectively remove H 2 S from indoor air at room temperature. 

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Experimental research and characteristics analysis of alumina‐supported copper oxide sorbent for flue gas desulfurization

Cited by 10 publications

References 18 publications

Selective catalytic reduction of NO with NH3 over sol-gel-derived CuO-CeO2-MnOx/γ-Al2O3 catalysts

Selective catalytic reduction of NO with NH3 over sol-gel-derived CuO-CeO2-MnOx/γ-Al2O3 catalysts

Decomposition of nitrous oxide over a low‐cost catalyst

Chemisorption of hydrogen sulfide on halloysite‐based porous clay heterostructures modified with potassium permanganate

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