Molybdenum carbide catalyst for the reduction of CO<sub>2</sub> to CO: surface science aspects by NAPPES and catalysis studies

Reddy, Kasala Prabhakar; Dama, Srikanth; Mhamane, Nitin B.; Ghosalya, Manoj Kumar; Raja, Thirumalaiswamy; Satyanarayana, C.V.V.; Gopinath, Chinnakonda S.

doi:10.1039/c9dt01774g

Cited by 40 publications

(33 citation statements)

References 54 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It is well-known that shift in CB energy would enhance the electron utilization and HER. VBPES analysis fully ascertain a strong electronic interaction between titania and the cocatalyst, particularly in NFT31. − …”

Section: Resultsmentioning

confidence: 98%

Rationally Designed, Efficient, and Earth-Abundant Ni–Fe Cocatalysts for Solar Hydrogen Generation

Tudu

Nalajala

Reddy

et al. 2021

ACS Sustainable Chem. Eng.

Self Cite

View full text Add to dashboard Cite

Developing highly efficient and affordable catalysts for solar hydrogen (H2) generation is crucial, and employing a cocatalyst from earth-abundant elements has a critical role to play. In this context, different compositions of earth-abundant Ni–Fe alloy (1:1, 1:3, and 3:1) have been prepared by hydrothermal method; subsequently, 1 wt % of these Ni–Fe cocatalysts were integrated with TiO2-P25 and thoroughly characterized. The resultant catalysts have been evaluated for solar H2 production, in powder and thin film forms, under one sun condition and in direct sunlight. Interestingly, all the catalysts in the thin film form exhibit superior hydrogen yield (HY), up to 27 times higher activity than its powder counterpart. Among the photocatalysts, Ni–Fe/TiO2 (3:1 = Ni/Fe; NFT31) composition exhibits the best HY in thin film (8.27 mmol·h–1·g–1) and exceeds all other compositions of catalyst. It is also to be reported that HY measured for the powder form with 1 mg shows 3–17 times higher activity than that measured with 25 mg. This is mainly attributed to effective solar light absorption with a smaller amount of photocatalyst either spread over large area in a thin film form or well-dispersed in suspension forms. Furthermore, the enhanced activity obtained with Ni–Fe/TiO2 photocatalysts is also ascribed to strong electronic integration of Ni–Fe cocatalyst with TiO2 and higher performance obtained with a thin film is attributed to increased charge carrier generation and subsequent charge separation and effective utilization. A decrease in work function of TiO2 by 0.6 eV was observed after its integration with cocatalyst in NFT31.

show abstract

Section: Resultsmentioning

confidence: 98%

Rationally Designed, Efficient, and Earth-Abundant Ni–Fe Cocatalysts for Solar Hydrogen Generation

Tudu

Nalajala

Reddy

et al. 2021

ACS Sustainable Chem. Eng.

Self Cite

View full text Add to dashboard Cite

show abstract

“…Recently, transition metal carbides have attracted attention as promising catalysts for the conversion of CO 2 into CO, methanol, methane, and other hydrocarbons (Nagai et al, 1998b;Solymosi et al, 2002;Porosoff et al, 2014;Posada-Pérez et al, 2014, 2016aXu et al, 2014;Chen et al, 2015Chen et al, , 2016Gao et al, 2016;Liu et al, 2016;Han et al, 2019;Reddy et al, 2019). It has been reported through computational work that transition metal (e.g., Ti, Mo, and V) carbide surfaces are able to uptake and activate CO 2 (Posada-Pérez et al, 2014Kunkel et al, 2016Kunkel et al, , 2018Kunkel et al, , 2019Liu et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

“…Pd and Cu promote the formation of methanol while Co and Fe favor ethanol and C 2+ hydrocarbons (e.g., C 2 H 4 , C 2 H 6 ). The hydrogenation of CO 2 in gas phase has been evaluated over unsupported cubic MoC [particles Xu et al, 2014or nanowires Gao et al, 2016, hexagonal Mo 2 C [particles Liu et al, 2017;Reddy et al, 2019or nanowires Gao et al, 2016, Mo 2 C coated with nitrogen and sulfur-codoped carbon (Han et al, 2019), and metals (Au, Cu, Co, Ni) supported on molybdenum carbide (Xu et al, 2015;Posada-Pérez et al, 2016b) or titanium carbide (Rodriguez et al, 2013). The addition of a metal increases the activity and affects the selectivity; e.g., Ni, Co, and Cu favor the formation of methane, hydrocarbons, and methanol, respectively (Xu et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

Supported Molybdenum Carbide and Nitride Catalysts for Carbon Dioxide Hydrogenation

et al. 2020

View full text Add to dashboard Cite

Catalysts based on molybdenum carbide or nitride nanoparticles (2-5 nm) supported on titania were prepared by wet impregnation followed by a thermal treatment under alkane (methane or ethane)/hydrogen or nitrogen/hydrogen mixture, respectively. The samples were characterized by elemental analysis, volumetric adsorption of nitrogen, X-ray diffraction, and aberration-corrected transmission electron microscopy. They were evaluated for the hydrogenation of CO 2 in the 2-3 MPa and 200-300 • C ranges using a gas-phase flow fixed bed reactor. CO, methane, methanol, and ethane (in fraction-decreasing order) were formed on carbides, whereas CO, methanol, and methane were formed on nitrides. The carbide and nitride phase stoichiometries were tuned by varying the preparation conditions, leading to C/Mo and N/Mo atomic ratios of 0.2-1.8 and 0.5-0.7, respectively. The carbide activity increased for lower carburizing alkane concentration and temperature, i.e., lower C/Mo ratio. Enhanced carbide performances were obtained with pure anatase titania support as compared to P25 (anatase/rutile) titania or zirconia, with a methanol selectivity up to 11% at 250 • C. The nitride catalysts appeared less active but reached a methanol selectivity of 16% at 250 • C.

show abstract

“…Before the catalytic reaction, the Ni-Mo catalysts were reduced/carburised in situ in the reactor. Available in the literature data suggest that 700°C is sufficient for the carburisation/reduction process of similar samples (Ma et al, 2017;Reddy et al, 2019;Yao et al, 2018). However, the TPR tests (Fig.…”

Section: Catalyst Evaluationmentioning

confidence: 92%

Nickel–molybdenum catalysts for combined solid oxide fuel cell internal steam and dry reforming

Majewski

Singh

Labhasetwar

et al. 2021

Chemical Engineering Science

View full text Add to dashboard Cite

Molybdenum carbide catalyst for the reduction of CO₂ to CO: surface science aspects by NAPPES and catalysis studies

Abstract: Carbon dioxide is a greenhouse gas, and needs to be converted into one of the useful feedstocks, such as carbon monoxide and methanol.

Cited by 40 publications

References 54 publications

Rationally Designed, Efficient, and Earth-Abundant Ni–Fe Cocatalysts for Solar Hydrogen Generation

Rationally Designed, Efficient, and Earth-Abundant Ni–Fe Cocatalysts for Solar Hydrogen Generation

Supported Molybdenum Carbide and Nitride Catalysts for Carbon Dioxide Hydrogenation

Nickel–molybdenum catalysts for combined solid oxide fuel cell internal steam and dry reforming

Contact Info

Product

Resources

About

Molybdenum carbide catalyst for the reduction of CO2 to CO: surface science aspects by NAPPES and catalysis studies

Abstract: Carbon dioxide is a greenhouse gas, and needs to be converted into one of the useful feedstocks, such as carbon monoxide and methanol.

Cited by 40 publications

References 54 publications

Rationally Designed, Efficient, and Earth-Abundant Ni–Fe Cocatalysts for Solar Hydrogen Generation

Rationally Designed, Efficient, and Earth-Abundant Ni–Fe Cocatalysts for Solar Hydrogen Generation

Supported Molybdenum Carbide and Nitride Catalysts for Carbon Dioxide Hydrogenation

Nickel–molybdenum catalysts for combined solid oxide fuel cell internal steam and dry reforming

Contact Info

Product

Resources

About

Molybdenum carbide catalyst for the reduction of CO₂ to CO: surface science aspects by NAPPES and catalysis studies