A study on the mechanical strength of Fe2O3/Cr2O3/CuO catalyst for high temperature water gas shift reaction

Bahmani, Mohsen; Nazari, Mohadese; Mehreshtiagh, Melisa

doi:10.1007/s10934-020-01014-8

Cited by 6 publications

(5 citation statements)

References 40 publications

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“…On the other hand, the 2_H 2 /H 2_t and 3_H 2 /H 2_t ratios are higher and lower than 1 respectively. As reported above, iron reduction to its metallic state occurs at a temperature above 700 °C [12,37]; thus, we could speculate that iron is reduced to Fe 2 + and the overall H 2 uptake is affected by partial ceria reduction as occurring for copper oxide. The comparable hydrogen uptakes for the fresh and used samples suggest that the metallic iron is not generated during the reaction, thus explaining the null activity toward the methanation reaction.…”

Section: Resultsmentioning

confidence: 51%

“…Small amounts of transition metals significantly modify the TPR profiles, which show two or three reduction peaks at temperatures lower than those of pure ceria [33][34][35]. It is worth noting that CuO reduction under similar heating rates occurs at about 300-350 °C [36], while the reduction of Fe 2 O 3 to Fe 3 O 4 and to metallic Fe occurs at about 500 and 700 °C, respectively [12,37].…”

Section: Resultsmentioning

confidence: 99%

“…Copper addition resulted in improved performance due to an easier iron reduction [12]. Accordingly, the bimetallic Fe-Cu systems have been investigated, generally showing higher reaction rates than the corresponding iron catalysts toward both direct [10,13,14] and reverse [15] WGS reactions.…”

Section: Introductionmentioning

confidence: 99%

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Enhanced activity of bimetallic Fe-Cu catalysts supported on ceria toward water gas shift reaction: synergistic effect

Landi,

Sorbino,

Migliardini

et al. 2023

Front. Chem. Sci. Eng.

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Within the “hydrogen chain”, the hight-emperature water gas shift reaction represents a key step to improve the H2 yield and adjust the H2/COx ratio to fit the constraints of downstream processes. Despite the commercial application of the high-temperature water gas shift, novel catalysts characterized by higher intrinsic activity (especially at low temperatures), good thermal stability, and no chromium content are needed. In this work, we propose bimetallic iron-copper catalysts supported on ceria, characterized by low active phase content (iron oxide + copper oxide < 5 wt %). Fresh and used samples were characterized by inductively coupled plasma mass spectrometry, X-ray diffraction, nitrogen physisorption, scanning electron microscopy coupled with energy-dispersive X-ray spectroscopy, and temperature programmed reduction in hydrogen to relate physicochemical features and catalytic activity. The sample with iron/copper ≈ 1 and 4 wt % active phase content showed the best catalytic properties in terms of turnover frequency, no methane formation, and stability. Its unique properties were due to both strong iron-copper interaction and strong metal-support interaction, leading to outstanding redox behavior.

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Section: Resultsmentioning

confidence: 51%

Section: Resultsmentioning

confidence: 99%

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Enhanced activity of bimetallic Fe-Cu catalysts supported on ceria toward water gas shift reaction: synergistic effect

Landi,

Sorbino,

Migliardini

et al. 2023

Front. Chem. Sci. Eng.

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“…In this study, we found that the average crushing strength of cubic pellets was 178.39 ± 31.77 N. Wu et al (2007) evaluated the crushing strength of six commercial catalysts and found average values ranging from 167.58 ± 42.92 to 335.16 ± 109.76 N [29]. Iron, copper, and chromium oxide catalysts for gas exchange reactions in water were evaluated and had average values ranging from 93.79 ± 7.25 to 143.86 ± 22.44 N [30]. Therefore, the catalyst's mechanical resistance to compression in this study falls within the accepted range for industrial or inorganic catalysts, such as certain metal oxides.…”

Section: Mechanical Strength Of the Catalystmentioning

confidence: 99%

Production of Mannooligosaccharides from Açaí Seed by Immobilized β-Mannanase

Murillo-Franco,

Galvis-Nieto,

Orrego

2024

Processes

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In this work, an enzyme cocktail with β-mannanase as the main activity was immobilized on epoxy resin foams filled with fibers from annatto capsules. The catalytic system was characterized by SEM, FTIR, and a mechanical crush resistance test. The behavior of the pH and temperature for the hydrolysis of the locust bean gum were also studied. With the same substrate and with respect to the free enzyme, the immobilized enzyme showed an activity retention of 79.61%. Its operational stability in ten reuse cycles did not show any statistically significant loss of activity. This catalytic system was used to study the preferential release of MOS of two to five degrees of polymerization from mannan present in dried and ground açaí seeds, which were not subjected to any other pretreatment. Using an experimental response surface design, the predicted quadratic models for the M2–M5 MOS content were obtained and they fit well with the experimental data, predicting a production range between 0.435 and 20 g/L of MOS (M2–M5). In addition, the production reached about 12 g/L under the optimized conditions. These results indicate that the used foamed epoxy resin supports and immobilization methodology are suitable for catalyzing the hydrolysis of mannan from açaí seeds.

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“…The industrial catalysts used for HTS and LTS are Fe-Cr oxides and Cu-ZnO-Al 2 O 3 [1,[4][5][6][7]. Fe 2 O 3 /Cr 2 O 3 /CuO is used as commercial catalyst for high temperature water gas shift reaction in which Cr becomes carcinogenic as it is oxidized to Cr 6+ from Cr 3+ [8]. To overcome these problems, various metal oxide catalysts with noble metal impregnation or substitution were developed.…”

Section: Introductionmentioning

confidence: 99%

Feed Effects on Water–Gas Shift Activity of M/Co3O4-ZrO2 (M = Pt, Pd, and Ru) and Potassium Role in Methane Suppression

et al. 2023

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Water–gas shift (WGS) is an industrial process to tackle CO abatement and H2 upgradation. The syngas (CO and H2 mixture) obtained from steam or dry reformers often has unreacted (from dry reforming) or undesired (from steam reforming) CO2, which is subsequently sent to downstream WGS reactor for H2 upgradation. Thus, industrial processes must deal with CO2 and H2 in the reformate feed. Achieving high CO2 or H2 selectivities become challenging due to possible CO and CO2 methanation reactions, which further increases the separation costs to produce pure H2. In this study, M/Co3O4-ZrO2 (M = Ru, Pd and Pt) catalysts were prepared using sonochemical synthesis. The synthesized catalysts were tested for WGS activity under three feed conditions, namely, Feed A (CO and steam), Feed B (CO, H2 and steam) and Feed C (CO, H2, CO2 and steam). All the catalysts gave zero methane selectivity under Feed A conditions, whereas the methane selectivity was significant under Feed B and C conditions. Among all catalysts, PtCZ was found to be the best performing catalyst in terms of CO conversion and CO2 selectivity. However, it still suffered with low but significant methane selectivity. This best performing catalyst was further modified with an alkali component, potassium to suppress undesirable methane selectivity. All the catalysts were well characterized with BET, SEM, TEM to confirm the structural properties and effective doping of the noble metals. Additionally, the apparent activation energies were obtained to showcase the best catalyst.

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A study on the mechanical strength of Fe2O3/Cr2O3/CuO catalyst for high temperature water gas shift reaction

Cited by 6 publications

References 40 publications

Enhanced activity of bimetallic Fe-Cu catalysts supported on ceria toward water gas shift reaction: synergistic effect

Enhanced activity of bimetallic Fe-Cu catalysts supported on ceria toward water gas shift reaction: synergistic effect

Production of Mannooligosaccharides from Açaí Seed by Immobilized β-Mannanase

Feed Effects on Water–Gas Shift Activity of M/Co3O4-ZrO2 (M = Pt, Pd, and Ru) and Potassium Role in Methane Suppression

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