A sinter resistant Co Fischer-Tropsch catalyst promoted with Ru and supported on titania encapsulated by mesoporous silica

Coville, Neil J.; Dlamini, Mbongiseni W.; Mogodi, Mashikoane; Kumi, David O.; Jewell, Linda L.; Billing, David G.

doi:10.1016/j.apcata.2017.12.015

Cited by 33 publications

(30 citation statements)

References 36 publications

(52 reference statements)

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“…However, only cobalt-based catalysts and iron-based catalysts have been successfully applied in the industrial FTS application [9]. Cobalt based catalysts are preferred for FTS in a hydrogen rich syngas due to their characteristics of low activity for water-gas shift reaction, high selectivity for linear hydrocarbons, and better resistance to the deactivation by water (a byproduct of FTS reaction) [10,11]. The catalytic properties of the cobalt catalysts are usually affected by the chemical interactions between the supports and cobalt metal, the texture of the catalysts, and crystal morphology.…”

Section: Introductionmentioning

confidence: 99%

RETRACTED: The Influence of Texture on Co/SBA–15 Catalyst Performance for Fischer–Tropsch Synthesis

et al. 2018

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The influence of the Co/SBA-15 catalyst texture, such as pore size and pore length on Fischer-Tropsch (FT) Synthesis, was investigated in this paper. The morphology, structure, and microstructures of Co/SBA-15 catalysts were characterized by SEM, Brunauer-Emmett-Teller (BET), TPR, HRTEM, and XRD. The experimental results indicated that the increase of pore size could improve the activity of the Co/SBA-15 catalyst, and the further increase of pore size could not significantly promote the activity. Moreover, it was also found that the pore length of the Co/SBA-15 catalyst played a key role in the catalytic activity. CO 2 and C4+ selectivity were 2.0% and 74% during the simulated syngas (64% H 2 : 32% CO: balanced N 2 ) FT over the Co/SBA-15 catalysts, and CO conversion rate and CH 4 selectivity were 10.8% and 15.7% after 100 h time on stream.2 of 11 has uniform hexagonal channels and high thermal stability. The above features of SBA-15 lead to it being regarded as a suitable support for FTS catalyst [16]. Cai et al. and Wang et al. reported that the CO conversion was 6.51%-20.51%, and C 5+ selectivity was 42.43%-77.14% when Ru promoted Co/SBA-15 catalysts was used in FTS [17,18]. García et al. explored the effects of the Co-SiO 2 interaction, and thought that SBA could suppress the aggregation of metal particles and promote the metal dispersion [19].In this paper, the effect of the texture of Co/SBA-15 on FTS performance was investigated. Moreover, the reaction temperature and Co loading were also discussed. Results and DiscussionSEM images of SBA-15 are presented in Figure 1. SBA-15 consisted of aligned rod-like particles with a diameter of 1 µm and a length of 2-3 µm longwise, which coincided with the results of Prieto et al. [20]. It could be clearly observed from Figure 2 that SBA-15 had a well-ordered hexagonal crystal structure composed of one-dimensional channels, which was highly ordered and stable [21].Catalysts 2018, 8, x FOR PEER REVIEW 2 of 12

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Section: Introductionmentioning

confidence: 99%

RETRACTED: The Influence of Texture on Co/SBA–15 Catalyst Performance for Fischer–Tropsch Synthesis

et al. 2018

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“…In many reactions the promotion of catalysts is carried out to enhance both the activity and selectivity of the catalyst. For example, in the Fischer-Tropsch reaction, Co is promoted by a range of noble metals including Ru [16][17][18]. One of the processes by which the Ru affects the Co catalyst is believed to be spillover in which H atoms spillover from the Ru to the Co to aid in the Co reduction [17].…”

Section: Introductionmentioning

confidence: 99%

Co inside hollow carbon spheres as a Fischer-Tropsch catalyst: Spillover effects from Ru placed inside and outside the HCS

Coville

Dlamini

Kumi

et al. 2020

Applied Catalysis A: General

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Hollow carbon spheres (HCS) containing Co nanoparticles placed inside the HCS were synthesized for the first time using polystyrene spheres as a template. The encapsulated Co nanoparticles, after reduction, showed Fischer-Tropsch (FT) activity indicating syngas accessibility through the HCS porous shell. Two Co catalysts promoted by Ru, placed either inside or outside the HCS (CoRu@HCS and Co@HCS@Ru), were also synthesized andThe location of the Co and Ru was confirmed by SEM and TEM analyses. Insitu XRD studies indicated enhanced H2 reduction of the Co oxide to Co, inside the HCS, in the order CoRu@HCS >Co@HCS@Ru > Co@HCS. The CoRu@HCS catalyst had the highest FT activity, and this was ascribed to a primary spillover effect associated with the direct contact of the Co and Ru inside the HCS. A small secondary spillover effect was also noted for Co@HCS@Ru.

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“…However, supported metal catalysts deactivate at high temperatures when these metal particles sinter to form larger particles. Particle ALD is used to reduce sintering (Feng et al 2011 ; Liang et al 2011 ; Lu et al 2012 ; Kim et al 2018 ; Phaahlamohlaka et al 2018 ).…”

Section: Functionalized Particulate Materialsmentioning

confidence: 99%

Particle atomic layer deposition

Weimer

2019

J Nanopart Res

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The functionalization of fine primary particles by atomic layer deposition (particle ALD) provides for nearly perfect nanothick films to be deposited conformally on both external and internal particle surfaces, including nanoparticle surfaces. Film thickness is easily controlled from several angstroms to nanometers by the number of self-limiting surface reactions that are carried out sequentially. Films can be continuous or semi-continuous. This review starts with a short early history of particle ALD. The discussion includes agitated reactor processing, both atomic and molecular layer deposition (MLD), coating of both inorganic and polymer particles, nanoparticles, and nanotubes. A number of applications are presented, and a path forward, including likely near-term commercial products, is given.

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A sinter resistant Co Fischer-Tropsch catalyst promoted with Ru and supported on titania encapsulated by mesoporous silica

Cited by 33 publications

References 36 publications

RETRACTED: The Influence of Texture on Co/SBA–15 Catalyst Performance for Fischer–Tropsch Synthesis

RETRACTED: The Influence of Texture on Co/SBA–15 Catalyst Performance for Fischer–Tropsch Synthesis

Co inside hollow carbon spheres as a Fischer-Tropsch catalyst: Spillover effects from Ru placed inside and outside the HCS

Particle atomic layer deposition

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