Selection of Metal Oxides for Removing SO<sub>2</sub> From Flue Gas

Lowell, P.S.; Schwitzgebel, K.; Parsons, T.B.; Sladek, K. J.

doi:10.1021/i260039a018

Cited by 90 publications

(55 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Lowell et al [23] collected and discussed data on decomposition of sulphates and sulphites of 46 elements. The most relevant data for our scope are summarised in Table 3.…”

Section: -Effect Of the Nature Of B Metal On Activity And Resistance mentioning

confidence: 99%

Effect of sulphur poisoning on perovskite catalysts prepared by flame-pyrolysis

Rossetti

Buchneva

Biffi

et al. 2009

Applied Catalysis B: Environmental

View full text Add to dashboard Cite

ABO3 perovskite-like catalysts are known to be sensitive to sulphur-containing compounds. Possible solutions to increase resistance to sulphur are represented by either catalyst bed protection with basic guards or catalyst doping with different transition or noble metals. In the present work La(1-x)A'xCoO3, La(1-x)A'xMnO3 and La(1-x)A'xFeO3, with A' = Ce, Sr and x=0, 0.1, 0.2, either pure or doped with noble metals (0.5 wt% Pt or Pd), were prepared in nano-powder form by flame pyrolysis. All the catalysts were tested for the catalytic flameless combustion of methane, monitoring the activity by on-line mass spectrometry. The catalysts were then progressively deactivated in operando with a new procedure, consisting of repeated injection of some doses of tetrahydrothiophene (THT), usually employed as odorant in the natural gas grid, with continuous analysis of the transient response of the catalyst. The activity tests were then repeated on the poisoned catalyst. Different regenerative treatments were also tried, either in oxidising or reducing atmosphere.Among the unsubstituted samples, higher activity and better resistance to poisoning have been observed in general with manganites with respect to the corresponding formulations containing Co or Fe at the B-site. The worst catalyst showed LaFeO3, from both the points of view of activity and of resistance to sulphur * Corresponding author: fax +39-02-50314300, e-mail ilenia.rossetti@unimi.it 2 poisoning. La0,9Sr0,1MnO3 showed, the best results, exhibiting very high activity and good resistance even after the addition of up to 8.4 mg of THT per g of catalyst.Interesting results were attained also by adding Sr to Co-based perovskites. Sr showed a first action by forcing Mn or Co in their highest oxidation state, but, in addition, it could also act as a sulphur guard, likely forming stable sulphates due to its basicity. Among noble metals, Pt doping proved beneficial in improving the activity of both the fresh and the poisoned catalyst.Keywords: Methane, catalytic combustion; Sulphur poisoning; Perovskite-like catalysts. -INTRODUCTIONThe catalytic flameless combustion (CFC) of methane outperforms conventional flame combustion because of lower emission of pollutants (HC, CO and NOx) and high thermal efficiency. The catalysts traditionally used for CFC are mainly based on supported noble metals, such as Pd and Pt, which ensure high activity, however accompanied by some drawbacks, due to high cost and poor thermal and chemical stability. La-based catalysts with ABO3 perovskite-like structure [1][2][3][4] have been proposed as a valid alternative for the present application. Indeed, perovskite catalysts combine low cost, thermo-chemical stability at high operating temperature and satisfactory catalytic activity [5][6][7][8]. In spite of this, there are still some open questions, especially regarding their resistance to sulphur poisoning when used for the CFC of methane. Indeed, the poisoning mechanism of perovskite-like catalysts has not been completely understood a...

show abstract

“…Lowell et al [23] collected and discussed data on decomposition of sulphates and sulphites of 46 elements. The most relevant data for our scope are summarised in Table 3.…”

Section: -Effect Of the Nature Of B Metal On Activity And Resistance mentioning

confidence: 99%

Effect of sulphur poisoning on perovskite catalysts prepared by flame-pyrolysis

Rossetti

Buchneva

Biffi

et al. 2009

Applied Catalysis B: Environmental

View full text Add to dashboard Cite

show abstract

“…Better SO 2 resistance of perovskite is obtained when Co is replaced by an element with lower heat of decomposition of the formed sulfate species. According to Ostroff et al (19), strontium sulfate decomposes directly to the oxides at temperatures above 1647 K (others indicate (20)(21)(22) 1073, 1473 and 1873 K). Trivalent metal sulfates will decompose at lower temperatures than divalent metal sulfates.…”

Section: Preferential Sulfur Poisoning In Lscmentioning

confidence: 99%

Sulfur as Pollutant Species on the Cathode Side of a SOFC System

Schüler¹,

Wuillemin²,

Hessler-Wyser³

et al. 2009

ECS Trans.

View full text Add to dashboard Cite

In order to link electrochemical performance degradation of the cathode in a large solid oxide fuel cell (SOFC) to the presence of pollutant species, a spatially-resolved study of contaminants was performed. Distribution maps of pollutants over the cell allowed identifying their sources. Besides chromium and silicon, sulfur was found as a major pollutant species. Its preferential reaction with strontium doped lanthanum cobaltite (LSC), forming strontium sulfate SrSO 4 , compared to strontium doped lanthanum manganite (LSM) is revealed here. When sulfur poisoning arises in combination with chromium, a sulfur-containing strontium chromate compound is formed.

show abstract

“…According to Figure 3, the former value was selected because it represents the O 2 partial pressure in atmospheric pressure, and the latter value was selected according to Ref. [22]. As the O 2 partial pressure decreases, the regions of sulfur dioxide stability expand while those of the sulfide and sulfate diminish.…”

Section: The Influence Of Temperature On Dry Desulfurizationmentioning

confidence: 99%

“…Iron oxide was considered to be a very promising and attractive sorbet for high-temperature desulfurization [5,22,24] because of its favorable sulfation thermodynamics.…”

Section: The Overlap Area Of Mn-s-o and Fe-s-o Systemsmentioning

confidence: 99%

Thermodynamic Analysis of Pyrolusite for Dry Flue Gas Desulfurization

Wang

et al. 2016

Environments

View full text Add to dashboard Cite

Abstract:Various approaches to flue gas desulfurization by low-grade manganese and high efficiency desulfurization in sintering enterprises were investigated, and the predominance areas of the Mn/Fe-S-O system were constructed in this paper. Additionally, the areas in different temperatures were established based on the thermodynamic properties achieved from manuals. From the view of thermodynamics, manganese oxides were suitable and feasible for desulfurization at an appropriate temperature range from 393 K to 453 K (120˝C to 180˝C), which means that the SO 2 of sintering flue gas could be removed directly without further cooling or heating. The analysis often showed that there was an overlap area of the Mn-S-O and Fe-S-O system, indicating that it would be a coexistence stability region of MnSO 4 and Fe 2 O 3 , which provided a possibility of desulfurization by selective salvation without the sulfate and sulfide of iron forming. More importantly, the predominance areas of Mn/Fe-S-O would offer an attractive way of determining optimum experimental conditions for dry desulfurization by low-grade manganese resources.

show abstract

Selection of Metal Oxides for Removing SO₂ From Flue Gas

Cited by 90 publications

References 3 publications

Effect of sulphur poisoning on perovskite catalysts prepared by flame-pyrolysis

Effect of sulphur poisoning on perovskite catalysts prepared by flame-pyrolysis

Sulfur as Pollutant Species on the Cathode Side of a SOFC System

Thermodynamic Analysis of Pyrolusite for Dry Flue Gas Desulfurization

Contact Info

Product

Resources

About

Selection of Metal Oxides for Removing SO2 From Flue Gas

Cited by 90 publications

References 3 publications

Effect of sulphur poisoning on perovskite catalysts prepared by flame-pyrolysis

Effect of sulphur poisoning on perovskite catalysts prepared by flame-pyrolysis

Sulfur as Pollutant Species on the Cathode Side of a SOFC System

Thermodynamic Analysis of Pyrolusite for Dry Flue Gas Desulfurization

Contact Info

Product

Resources

About

Selection of Metal Oxides for Removing SO₂ From Flue Gas