New insights on the effect of the H2/CO ratio for enhancement of CO methanation over metal-free fibrous silica ZSM-5: Thermodynamic and mechanistic studies

Hussain, I.; Mamat, Che Rozid; Siang, Tan Ji; Rahman, A.F.A.; Jalil, Aishah Abd.; Adnan, Rohul H.

doi:10.1016/j.enconman.2019.112056

Cited by 59 publications

(21 citation statements)

References 64 publications

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“…Moreover, all catalysts also exhibited an additional two signals at g = 1.91 which relate to the vibration structure of nonbridging oxygen hole centers in silica or lattice defects present in both catalysts. 78 Both catalysts showed similar changes in the signal, which suggests that the lattice defects also play an insignificant role in the isomer formation of n-hexane and cyclohexane.…”

Section: T H I S C O N T E N T Imentioning

confidence: 88%

Influence of Nitrate and Phosphate on Silica Fibrous Beta Zeolite Framework for Enhanced Cyclic and Noncyclic Alkane Isomerization

et al. 2020

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Phosphate and nitrate were loaded on silica BEA (P/HSi@BEA and N/HSi@BEA), which is fibrously protonated by the impregnation method for n-hexane and cyclohexane isomerization. The characterization analysis specified the removal of tetrahedral aluminum atoms in the framework, which was triggered by the existence of phosphate and nitrate groups in the catalyst. The exchanged role of Si(OH)Al to P–OH as active acidic sites in the P/HSi@BEA catalyst reduced its acidic strength, which was confirmed by the FTIR results. Lewis acidic sites of P/HSi@BEA performance are a significant part in the generation of high protonic acid sites, as proven by the in situ ESR study. However, FTIR evacuation and 27Al NMR revealed that the reduction in the amount of extraframework Al (EFAl) is due to its interaction with the nitrate group on the outside of the catalyst surface. The N/HSi@BEA catalyst exhibited high acidic strength because of the existence of more Si(OH)Al, which was initiated during the nitrate-incorporation process. Of significance is that the catalytic performance of n-hexane isomerization in the presence of hydrogen reached 50.3% product isomer yield at 250 °C, which might be ascribed to the presence of P–OH active sites that are responsible for accepting electrons, forming active protonic acid sites. NO3–EFAl interaction induced the formation of Brønsted acid sites, and higher mesopore volume favors the production of cyclohexane isomers up to 48.4% at 250 °C. This fundamental study exhibits that significant interactions given by such phosphate and nitrate groups with the unique silica fibrous BEA support could enhance isomerization, which contributes to the high quality of fuel.

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Section: T H I S C O N T E N T Imentioning

confidence: 88%

Influence of Nitrate and Phosphate on Silica Fibrous Beta Zeolite Framework for Enhanced Cyclic and Noncyclic Alkane Isomerization

et al. 2020

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“…However, some research has reported that the H2:COx ratio equivalent to, or higher than the stoichiometric ratios are both favourable for methanation reaction. However, below the stoichiometric ratio, carbon deposition on the catalyst resulting in lower catalytic activity and selectivity was observed [37,38]. Therefore, these results suggest that an optimal hydrogen space velocity is required to enhance the carbon oxides methanation reaction.…”

Section: Figurementioning

confidence: 88%

Synthetic natural gas production from the three stage (i) pyrolysis (ii) catalytic steam reforming (iii) catalytic hydrogenation of waste biomass

Jaffar

Nahil

Williams

2020

Fuel Processing Technology

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“…Oxygen vacancies and basicity of FSA are closely associated with dendrimeric silica fibers and surface defect. [59] Thus, unpaired electrons will be generated due to the formation of oxygen vacancies, creating a strong Lewis basicity on catalyst surface. Oxygen vacancy sites and basicity of catalysts are proven to enhance the adsorption of CO2 for the hydrogenation reaction.…”

Section: Promoted Modified or Mediated Heterogeneous Catalysts With N...mentioning

confidence: 99%

Catalytic valorization of CO₂ by hydrogenation: current status and future trends

2021

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Terrestrial environmental and biological systems are being threatened by the tremendous amount of human carbon dioxide emissions. Therefore, is crucial to develop a sustainable energy system based on CO2 as chemical feedstock. In this review an introduction to the CO2 activation and transformation has been made, together with a more comprehensive study of the catalytical reduction of CO2 to methane, methanol and formic acid, which are currently contemplated as chemical feedstocks and/or promising energy carriers and alternative fuels.

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New insights on the effect of the H2/CO ratio for enhancement of CO methanation over metal-free fibrous silica ZSM-5: Thermodynamic and mechanistic studies

Cited by 59 publications

References 64 publications

Influence of Nitrate and Phosphate on Silica Fibrous Beta Zeolite Framework for Enhanced Cyclic and Noncyclic Alkane Isomerization

Influence of Nitrate and Phosphate on Silica Fibrous Beta Zeolite Framework for Enhanced Cyclic and Noncyclic Alkane Isomerization

Synthetic natural gas production from the three stage (i) pyrolysis (ii) catalytic steam reforming (iii) catalytic hydrogenation of waste biomass

Catalytic valorization of CO₂ by hydrogenation: current status and future trends

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New insights on the effect of the H2/CO ratio for enhancement of CO methanation over metal-free fibrous silica ZSM-5: Thermodynamic and mechanistic studies

Cited by 59 publications

References 64 publications

Influence of Nitrate and Phosphate on Silica Fibrous Beta Zeolite Framework for Enhanced Cyclic and Noncyclic Alkane Isomerization

Influence of Nitrate and Phosphate on Silica Fibrous Beta Zeolite Framework for Enhanced Cyclic and Noncyclic Alkane Isomerization

Synthetic natural gas production from the three stage (i) pyrolysis (ii) catalytic steam reforming (iii) catalytic hydrogenation of waste biomass

Catalytic valorization of CO2 by hydrogenation: current status and future trends

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Product

Resources

About

Catalytic valorization of CO₂ by hydrogenation: current status and future trends