ChemInform Abstract: SULFUR DEACTIVATION OF NICKEL METHANATION CATALYSTS

Fitzharris, W.D.; Katzer, J.R.; Manogue, W.H.

doi:10.1002/chin.198245081

Cited by 6 publications

(11 citation statements)

References 1 publication

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“…These defect sites are sensitive to H 2 S adsorption. 4,16 The adsorbed sulfur can interact with surface Ni to form metal sulfide species. 3 The available active sites for catalytic reaction are occupied by the species, leading to the dramatic decrease of activity.…”

Section: Low Temperature-h 2 S Resistancementioning

confidence: 99%

“…An active metal surface is sensitive to H 2 S poisoning via the formation of various sulfur species (metal/organic sulfide). [2][3][4] These sulfur species are strongly interacted with the active metal surface, block the active sites, and lead to the loss of catalytic activity. Many efforts have been made to design a catalyst with high H 2 S resistance.…”

Section: Introductionmentioning

confidence: 99%

“…14 Few research works have been carried out on the development and characterization of structure properties related to H 2 S poisoning. 4,15,16 Rostrup-Nielsen and co-workers studied the effect of sulfur on Boudouard and methanation over a Ni catalyst and suggested that the two reactions have the same intermediate. 15 Sulfur poisoning affected the geometrical nickel structure.…”

Section: Introductionmentioning

confidence: 99%

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Enhanced sulfur resistance of Ni/SiO2 catalyst for methanation via the plasma decomposition of nickel precursor

Yan

Liu

Zhao

et al. 2013

Phys. Chem. Chem. Phys.

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A Ni/SiO2 catalyst was prepared by the plasma decomposition of a nickel precursor via dielectric barrier discharge (DBD). The obtained Ni/SiO2 catalyst shows an enhanced H2S resistance for methanation of syngas (CO + H2). The plasma decomposition has a significant influence on the structural property of Ni/SiO2. The plasma decomposed catalyst shows less defect sites on Ni particles. The formation of Ni-sulfur species was effectively inhibited. The mechanism of H2S poisoning on different catalysts with and without plasma decomposition was also discussed according to the reaction temperature.

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Section: Low Temperature-h 2 S Resistancementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Enhanced sulfur resistance of Ni/SiO2 catalyst for methanation via the plasma decomposition of nickel precursor

Yan

Liu

Zhao

et al. 2013

Phys. Chem. Chem. Phys.

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“…The formation of coke by a reversible reaction gives rise, as was already shown by Kittrell et al (1985), to the appearance of saturating a-t curves with oa 0. In case II, we are going to try to go deeper into the approach of Kittrell et al Also, this case can perhaps be applied to some cases of reversible formation of a deposit of sulfur as the situation indicated by Fitzharris et al (1982) or of deactivation by sintering in which there sometimes appear saturating a-t curves (Rethwisch et al, 1985; Hicks and Bell, 1984;Sudhakar and Vannice, 1985;Trimm, 1984). In this last situation, the size of the crystallite may increase to a constant value, on which the residual activity, oa, of the catalyst will depend.…”

Section: Case Ii: Reversible Formation Of Cokementioning

confidence: 99%

Some intrinsic kinetic equations and deactivation mechanisms leading to deactivation curves with a residual activity

Corella¹,

Adánez²,

Μοnzόn³

1988

Ind. Eng. Chem. Res.

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In catalyst deactivation processes, a final residual activity different from zero is frequently reported in the literature. This phenomenon occurs in different processes and for very different catalysts and causes of deactivation. In this work three different deactivation mechanisms which lead to the appearance of a residual final activity are analyzed. Such deactivation mechanisms correspond to the following situations: (i) hior polyfunctional catalysts or monofunctional catalysts with active sites of different strength; (ii) reversible formation of coke; and (iii) generation and disappearance, simultaneous and in equilibrium, of active sites. The deactivation kinetic equations corresponding to these three mechanisms are deduced and analyzed. These equations include, explain, and generalize all the previous empirical kinetic equations existing for this situation. Also, these equations, with two to four parameters, adjust all the a-t (or a-Cc) data with ,^ found in the literature.When a catalyst is deactivated, its activity does not always drop to zero but sometimes reaches a residual or steady-state activity, as, as shown in Figure 1. It is often difficult to say whether this activity is really constant with the time-on-stream (or with the coke content) or whether it decreases slightly or imperceptibly. The existence of this residual activity has been found by many authors (Barbier,

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“…Usually, sulphur tends to induce passivation of the catalyst and the deactivation mechanism is generally accepted to be due to geometric site blockage by sulphur atoms on the metal crystal surface [5,7,8]. The topic is of particular interest for application to AGR nuclear reactors where deposition can result in heat transfer problems.…”

Section: Introductionmentioning

confidence: 99%

The influence of carbonyl sulphide on the inhibition of filamentary carbon deposition on stainless steel

Millward

Evans²,

Jones

et al. 2003

Materials & Corrosion

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This paper examines the role that COS plays in the inhibition of carbon deposition onto a Si-free 20Cr-25Ni-Nb-stabilized austenitic stainless steel. We have shown that the addition of just 240 vppb of COS to a standard gas deposit mixture of high carbon activity (1000 vppm C 2 H 4 , 1% CO, balance CO 2 ) yields a dramatic fall in the amount of filamentous carbon deposited. The inhibitive effect persists when treatment is continued after COS has been subsequently removed from the treatment gas. Clearly, in these experiments the phenomenon is a result of substrate surface modification by the COS rather than changes in gas phase kinetics. Deposition onto surfaces where filamentous carbon has already been laid down is similarly inhibited.

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ChemInform Abstract: SULFUR DEACTIVATION OF NICKEL METHANATION CATALYSTS

Cited by 6 publications

References 1 publication

Enhanced sulfur resistance of Ni/SiO2 catalyst for methanation via the plasma decomposition of nickel precursor

Enhanced sulfur resistance of Ni/SiO2 catalyst for methanation via the plasma decomposition of nickel precursor

Some intrinsic kinetic equations and deactivation mechanisms leading to deactivation curves with a residual activity

The influence of carbonyl sulphide on the inhibition of filamentary carbon deposition on stainless steel

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