Studies on cobalt-based Fischer–Tropsch catalyst and characterization using SEM and XPS techniques

Sharma, Bhagwati; Sharma, Mahendra P; Kumar, Suresh; Roy, S. K.; Roy, S. K.; Badrinarayanan, S.; Sainkar, S. R.; Mandale, A.B.; Date, S. K.

doi:10.1016/s0926-860x(00)00860-7

Cited by 15 publications

(3 citation statements)

References 19 publications

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“…Such situation may arise in the formation of non-stoichiometric lithium silicate and becomes very reactive. In a separate study on silica supported cobalt catalyst, Sharma et al (2001) observed higher reactivity in FT reactions due to formation of non-stoichiometry in SiO 2 to SiO x and formation of cobalt silicate. Further rise in temperature ( 630 • C) brings weakening of Li 2 O and SiO x bond with the increase in temperature and may be the reason for decrease in sorption capacity.…”

Section: Resultsmentioning

confidence: 92%

Reverse microemulsion mediated sol–gel synthesis of lithium silicate nanoparticles under ambient conditions: Scope for CO2 sequestration

Khomane

Sharma

Saha

et al. 2006

Chemical Engineering Science

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Section: Resultsmentioning

confidence: 92%

Reverse microemulsion mediated sol–gel synthesis of lithium silicate nanoparticles under ambient conditions: Scope for CO2 sequestration

Khomane

Sharma

Saha

et al. 2006

Chemical Engineering Science

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“…In general, a large sorption capacity, adequate kinetics, cyclability, stability, and a wide thermal operation range could define the ideal perfect capture material . Thus, it different kinds of materials as potential CO 2 captors had been proposed, such as membranes, zeolites, activated carbons, hydrotalcites, metal–organic frameworks (MOFs), amine‐based adsorbents, alkaline oxides and earth alkaline oxides, among others. However, CO 2 capture capacity in these materials is not good enough, and several of these materials cannot be regenerated.…”

Section: Introductionmentioning

confidence: 99%

CO₂ chemisorption and cyclability analyses in α−Li₅AlO₄: effects of Na₂CO₃ and K₂CO₃ addition

Flores

Pfeiffer

2015

Greenhouse Gases

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Lithium aluminate (α−Li5AlO4) was synthesized and mixed with potassium carbonate or sodium carbonate. The addition of these alkaline carbonates was produced during or after the synthesis process. The CO2 chemisorption was evaluated using dynamic, isothermal, and cyclic thermogravimetric analyses. The presence of the K or Na in α−Li5AlO4 changes the sorption properties in a wide temperature range. K‐ and Na‐Li5AlO4 samples, when the alkaline carbonates were added 10 wt% presented better CO2 capture properties, capturing 37−39 wt% at 660 °C and ∼50 wt% at 710 °C, for doped samples prepared mechanically or synthetically, respectively. The results revealed that the weight gained on α−Li5AlO4 mixed with K‐ or Na‐carbonates was attributed to the formation of the eutectic phases. These materials would be suitable for CO2 capture over a wide temperature range depending on the application process. Nevertheless, the cyclic experiments showed important variations in their respective efficiencies, depending on the temperature. © 2015 Society of Chemical Industry and John Wiley & Sons, Ltd

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“…3D data can be obtained using electron tomography, but the need to collect multiple images over a range of tilts conflicts with achieving the temporal resolution needed to capture catalyst dynamics. Scanning electron microscopy (SEM) imaging resolves the support topography and the positions and sizes of surface catalyst particles. − Such information is directly relevant to the catalyst performance and is obtained without the time required for a full 3D reconstruction, but at the cost of a resolution that is typically lower than that achieved by tomography. However, in recent years it has become possible to acquire a secondary electron image simultaneously while collecting a STEM image, and with improved resolution. − This combined imaging is achieved in a scanning transmission electron microscope by using separate detectors to collect the distinct signals generated when the STEM beam scans across the sample.…”

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confidence: 99%

Simultaneous 2D Projection and 3D Topographic Imaging of Gas-Dependent Dynamics of Catalytic Nanoparticles

Lee,

Gadelrab,

Cheng

et al. 2024

ACS Nano

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Catalyst deactivation through pathways such as sintering of nanoparticles and degradation of the support is a critical factor when designing high-performance catalysts. Here, structural changes of supported nanoparticle catalysts are investigated in controlled gas environments (O 2 , H 2 O, and H 2 ) at different temperatures by imaging simultaneously the nanoparticle structures in 2D projection and the 3D surface-sensitive topography. Platinum nanoparticles on carbon support as a model system are imaged in an environmental transmission electron microscope (ETEM), with concurrent acquisition of high-angle annular dark field scanning TEM (HAADF-STEM) and secondary electron (SE) images. Particle migration and coalescence occurs and shows gas-dependent kinetics, with nanoparticles moving across and through the support during and after coalescence. The temperature required for motion is lower in O 2 than in H 2 O and H 2 , explained through the nature of the gas/nanoparticle interactions. In O 2 and H 2 , the carbon support degrades by trench formation along migration pathways, and the particles move continuously, indicating a chemical reaction between gas and support. In H 2 O gas, motion is more discontinuous and oriented particle attachment occurs, as expected from theoretical predictions. These results suggest that multimodal imaging in ETEM that combines HAADF-STEM and SE data provides comprehensive information regarding catalyst dynamics and degradation mechanisms.

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Studies on cobalt-based Fischer–Tropsch catalyst and characterization using SEM and XPS techniques

Cited by 15 publications

References 19 publications

Reverse microemulsion mediated sol–gel synthesis of lithium silicate nanoparticles under ambient conditions: Scope for CO2 sequestration

Reverse microemulsion mediated sol–gel synthesis of lithium silicate nanoparticles under ambient conditions: Scope for CO2 sequestration

CO₂ chemisorption and cyclability analyses in α−Li₅AlO₄: effects of Na₂CO₃ and K₂CO₃ addition

Simultaneous 2D Projection and 3D Topographic Imaging of Gas-Dependent Dynamics of Catalytic Nanoparticles

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Studies on cobalt-based Fischer–Tropsch catalyst and characterization using SEM and XPS techniques

Cited by 15 publications

References 19 publications

Reverse microemulsion mediated sol–gel synthesis of lithium silicate nanoparticles under ambient conditions: Scope for CO2 sequestration

Reverse microemulsion mediated sol–gel synthesis of lithium silicate nanoparticles under ambient conditions: Scope for CO2 sequestration

CO2 chemisorption and cyclability analyses in α−Li5AlO4: effects of Na2CO3 and K2CO3 addition

Simultaneous 2D Projection and 3D Topographic Imaging of Gas-Dependent Dynamics of Catalytic Nanoparticles

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CO₂ chemisorption and cyclability analyses in α−Li₅AlO₄: effects of Na₂CO₃ and K₂CO₃ addition