Towards A Better Understanding of Sintering Phenomena in Catalysis

Fuentes, Gustavo A.; Gamas, E.D.

doi:10.1016/s0167-2991(08)62694-4

Cited by 22 publications

(7 citation statements)

References 12 publications

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“…Moreover, the use of the SPLE is further questionable because variations in sintering order are observed as a function of time and temperature for a given catalyst in a fixed atmosphere [105][106][107]; thus, data obtained for different samples and different reaction conditions cannot be quantitatively compared. Nevertheless, it has been shown by Fuentes [111,112] and Bartholomew [104][105][106] that the effects of temperature, atmosphere, metal, promoter, and support can be quantitatively determined by fitting sintering kinetic data to the general power-law expression (GPLE)…”

Section: Factors Affecting Metal Particle Growth and Redispersion In mentioning

confidence: 99%

Heterogeneous Catalyst Deactivation and Regeneration: A Review

2015

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Deactivation of heterogeneous catalysts is a ubiquitous problem that causes loss of catalytic rate with time. This review on deactivation and regeneration of heterogeneous catalysts classifies deactivation by type (chemical, thermal, and mechanical) and by mechanism (poisoning, fouling, thermal degradation, vapor formation, vapor-solid and solid-solid reactions, and attrition/crushing). The key features and considerations for each of these deactivation types is reviewed in detail with reference to the latest literature reports in these areas. Two case studies on the deactivation mechanisms of catalysts used for cobalt Fischer-Tropsch and selective catalytic reduction are considered to provide additional depth in the topics of sintering, coking, poisoning, and fouling. Regeneration considerations and options are also briefly discussed for each deactivation mechanism.

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Section: Factors Affecting Metal Particle Growth and Redispersion In mentioning

confidence: 99%

Heterogeneous Catalyst Deactivation and Regeneration: A Review

2015

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“…Indeed, it is found that even for the same catalyst sintering order may vary as a function of time, temperature, and atmosphere. Further progress was then done through the application of the general power law expression (GPLE) originally developed by Fuentes 28 and co-workers in 1987.…”

Section: Atomic or Particle Migration?mentioning

confidence: 99%

Mechanistic Modeling of Cobalt Based Catalyst Sintering in a Fixed Bed Reactor under Different Conditions of Fischer–Tropsch Synthesis

Sadeqzadeh

Hong

Fongarland

et al. 2012

Ind. Eng. Chem. Res.

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A three-step sintering mechanism is proposed for Co-based catalysts under Fischer–Tropsch reaction conditions. This mechanism includes an intermediate formation of oxide layer on cobalt metal nanoparticles in the presence of water. The partially reversibly oxidized surface accelerates sintering by both reducing the surface energy and enhancing the diffusion rates of cobalt particles. The proposed mechanism is then employed for a fixed-bed unsteady state reactor. The effect of particle growth on the catalytic activity was analyzed within a diverse range of operating conditions (syngas ratio = 1.5–4, water co-feed ratio = 0–6, inert co-feed ratio = 0–6). It is found that, at the same gas space velocity, sintering proceeds faster at higher H2/CO ratios. At the same initial conversion, a low H2/CO syngas ratio increases sintering severity, i.e., catalyst deactivation due to the crystallite growth, as it brings about higher relative water partial pressure. Dilution of syngas with different amounts of inert gas does not affect the cobalt sintering rate. Cobalt sintering proceeds more rapidly if water is co-fed during the reaction.

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“…Nevertheless, it has been shown (Fuentes and Ruiz-Trevino, 1991 ;Bartholomew, 1993a, b) that the effects of temperature, atmosphere, metal, promoter, and support can be quantitatively determined by fitting sintering kinetic data to the general power law expression (GPLE) The use of the SPLE is further questionable because variations in sintering order are observed as a function of time and temperature for a given catalyst in a fixed atmosphere; thus, data obtained for different samples and different reaction conditions cannot be quantitatively compared.…”

Section: Fundamentals Of Industrial Catalytic Processesmentioning

confidence: 99%

Catalyst Deactivation: Causes, Mechanisms, and Treatment

2005

Fundamentals of Industrial Catalytic Processes

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Towards A Better Understanding of Sintering Phenomena in Catalysis

Cited by 22 publications

References 12 publications

Heterogeneous Catalyst Deactivation and Regeneration: A Review

Heterogeneous Catalyst Deactivation and Regeneration: A Review

Mechanistic Modeling of Cobalt Based Catalyst Sintering in a Fixed Bed Reactor under Different Conditions of Fischer–Tropsch Synthesis

Catalyst Deactivation: Causes, Mechanisms, and Treatment

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