SO2 deactivation in NO reduction by NH3III. Auger studies of deactivated catalysts

Tsai, James H.; Agrawal, Pradeep; Foley, James M.; Katzer, J.R.; Manogue, W.H.

doi:10.1016/0021-9517(80)90355-3

Cited by 19 publications

(1 citation statement)

References 15 publications

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“…The penetration of sulphur into the bulk phase of Pd in sulphur poisoning has also been studied. 8 In earlier studies Pd/C showed much higher activity than Raney-Ni in the hydrogenation of o-nitrophenol to o-aminophenol in a three-phase slurry reactor.9 The activity of the Raney-Ni catalyst for the hydrogenation of nitro compounds was found to be reduced markedly because of catalyst poisoning by heavy metals (viz. Pb, Zn and Hg), chloro (dichloroethane) and sulphur (thiophene) compounds at low concentrations.10 It is also interesting to know the inÑuence of these poisons on the performance of PdÈcarbon in the hydrogenation of nitro compounds to corresponding amino compounds.…”

Section: Introductionmentioning

confidence: 97%

Poisoning of Pd-carbon catalysts by sulphur, chloro and heavy metal compounds in liquid phase hydrogenation ofo-nitrophenol too-aminophenol

Choudhary

Sane

1998

J. Chem. Technol. Biotechnol.

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The poisoning of PdÈcarbon (4É1% Pd) catalysts by thiophene, dichloroethane, mercuric chloride and lead, zinc and mercuric acetates at di †erent concentrations (0È5000 g m~3) in the liquid phase hydrogenation of onitrophenol to o-aminophenol (at 308 K and pressure of 1508 kPa) in a H 2 three-phase stirred slurry reactor has been investigated. The hydrogenation activity of the catalyst is drastically reduced due to the presence of these poisons in the reaction mixture, even at a very low concentration of poison (20 g m~3). Among the poisons, mercuric acetate was found to be the most potent. 1998 ( Society of Chemical Industry

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Section: Introductionmentioning

confidence: 97%

Poisoning of Pd-carbon catalysts by sulphur, chloro and heavy metal compounds in liquid phase hydrogenation ofo-nitrophenol too-aminophenol

Choudhary

Sane

1998

J. Chem. Technol. Biotechnol.

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Chemisorption of sulfur dioxide on tungsten and platinum surfaces

Wu¹,

Burns

1981

Surface & Interface Analysis

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The chemisorption of SO, on a W and a Pt surface has been investigated by flash desorption mass spectrometry (FDMS) and AES. AES data indicate that the chemisorbed sulfur dioxide molecules oxidized the W surface, and produced a stable tungsten oxide during the heating (up to 1400K) process. FDMS data indicate that the decomposition of SO, yielded elemental and molecular sulfur during the desorption process. FDMS data show that SO, exists in four binding states (al, a,, a3 and a,,) on a clean Pt surface and in three binding states (a5, a6 and a,) on an oxidized Pt surface. In addition, the coadsorption of SO2 and 0, was carried out on a Pt surface. The coadsorption process can produce SO3 which exists in two different binding states on a Pt surface. The data indicate that the oxidation of SO, to form SO3 on a Pt surface occurs by means of a Langmuir-Hinshelwood mechanism.

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XPS studies of NO selective reduction catalysts after SO₂ poisoning

Grzybek

Klinik

Buczek

1995

Surface & Interface Analysis

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The effect of an SO,-water vapour-air mixture on the structure of Fe3+-, Cuz+-, Coz+-or Ni*+-active carbon catalysts used for selective catalytic reduction of NO with ammonia was studied by low-temperature argon sorption and XPS. Active material reacted with oxidation products of SO, to form appropriate sulphates. The reaction rate, expressed as surface sulphur-to-cation ratio, depended on the distribution of active material on the starting samples. The distribution of Fe3+, Cu2+, NiZ+ and Coz+ changed during the reaction as a result of movement of the cations into the porous system and was accompanied by some decrease in specific surface area and partial blocking of micropores.

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SO2 deactivation in NO reduction by NH3III. Auger studies of deactivated catalysts

Cited by 19 publications

References 15 publications

Poisoning of Pd-carbon catalysts by sulphur, chloro and heavy metal compounds in liquid phase hydrogenation ofo-nitrophenol too-aminophenol

Poisoning of Pd-carbon catalysts by sulphur, chloro and heavy metal compounds in liquid phase hydrogenation ofo-nitrophenol too-aminophenol

Chemisorption of sulfur dioxide on tungsten and platinum surfaces

XPS studies of NO selective reduction catalysts after SO₂ poisoning

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SO2 deactivation in NO reduction by NH3III. Auger studies of deactivated catalysts

Cited by 19 publications

References 15 publications

Poisoning of Pd-carbon catalysts by sulphur, chloro and heavy metal compounds in liquid phase hydrogenation ofo-nitrophenol too-aminophenol

Poisoning of Pd-carbon catalysts by sulphur, chloro and heavy metal compounds in liquid phase hydrogenation ofo-nitrophenol too-aminophenol

Chemisorption of sulfur dioxide on tungsten and platinum surfaces

XPS studies of NO selective reduction catalysts after SO2 poisoning

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About

XPS studies of NO selective reduction catalysts after SO₂ poisoning