Structure and SO3 decomposition activity of nCuO–V2O5/SiO2 (n= 0, 1, 2, 3 and 5) catalysts for solar thermochemical water splitting cycles

Kawada, Takahiro; Hinokuma, Satoshi; Machida, Masato

doi:10.1016/j.cattod.2014.05.023

Cited by 35 publications

(23 citation statements)

References 29 publications

(30 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…On the other hand, the SO 3 decomposition activity was negligible when MÀV oxides with higher T d values were used, because these compounds including basic metals were immediately deactivated by their sulfate formation at 600 C. Nevertheless, it should be noted that the activity appeared even for these basic metals when the reaction temperature was higher than 600 C. At 700 C, for instance, CeeV attained the SO 3 conversion of 37%, compared to 53% for CueV. Another noteworthy feature of the CueV is the proximity of the melting point to the SO 3 decomposition temperatures [36,38]. Although the molten phase of CueV exhibited a higher catalytic activity than the solid phase, the potential deactivation by a vaporization loss may limit the use above 700 C. By contrast, the higher melting point of an orthovanadate CeVO 4 phase (>1000 C) is expected to ensure the stability of the catalyst during the reaction.…”

Section: Resultsmentioning

confidence: 99%

“…Among four binary compounds, CuV 2 O 6 , Cu 2 V 2 O 7 , Cu 3 V 2 O 8 and Cu 5 V 2 O 10 , in the CuOeV 2 O 5 system, the highest catalytic activity was achieved for CuV 2 O 6 , which corresponds to the phase with the lowest melting point (630 C) [36,38]. The activity could further be enhanced by the use of support materials consisting of 3-D mesoporous silica [34].…”

Section: Introductionmentioning

confidence: 86%

See 1 more Smart Citation

Structure and SO3 decomposition activity of CeVO4/SiO2 catalysts for solar thermochemical water splitting cycles

Kawada

Ikematsu

Tajiri

et al. 2015

International Journal of Hydrogen Energy

Self Cite

View full text Add to dashboard Cite

SO 3 decompositionThermochemical water splitting Sulfureiodine cycle a b s t r a c t CeeV oxide catalysts supported on bimodal mesoporous SiO 2 were prepared by a wet impregnation method to study their catalytic activity for SO 3 decomposition, which is a key step in thermochemical water splitting cycles based on the sulfureiodine process. Asprepared CeeV/SiO 2 catalysts exhibited more than 50-fold higher turnover frequency at 600 C compared to unsupported CeVO 4 . This is in accordance with the smaller size (13 nm) of CeVO 4 particles highly dispersed in SiO 2 mesopores, compared to approximately 600 nm for unsupported CeVO 4 particles. The CeeV/SiO 2 catalysts exhibited a higher activity than supported V 2 O 5 or CeO 2 catalysts, which coexisted depending on the Ce/V ratio. Among the studied catalysts with different Ce/V molar ratios, the highest activity was achieved at Ce/ V ¼ 0.9, at which the greatest specific surface area of CeVO 4 was attained. The catalyst demonstrated SO 3 decomposition rates comparable to those of Pt/Al 2 O 3 in a wide range of WHSV (3.6e110 g-H 2 SO 4 g À1 h À1 ) and no indication of noticeable deactivation during 40 h of the catalytic reaction at 650 C.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 86%

Structure and SO3 decomposition activity of CeVO4/SiO2 catalysts for solar thermochemical water splitting cycles

Kawada

Ikematsu

Tajiri

et al. 2015

International Journal of Hydrogen Energy

Self Cite

View full text Add to dashboard Cite

show abstract

“…This has been demonstrated through construction of a scalable reactor employing CeO 2 which generates efficiency as high as 0.8 %, exploiting the rapid redox kinetics of the ceria particles . Recently other oxide‐based materials have been employed, such as Co‐perovskites, Ni or Co‐ferrites, and CuO‐V 2 O 5 …”

Section: Hydrogen Production: the Possible Transition From Fossil Fuementioning

confidence: 99%

“…[52] Recently other oxide-based materials have been employed, such as Co-perovskites, [53] Ni or Co-ferrites, [54] and CuO-V 2 O 5 . [55] 4. The Double Impact of CO 2 Reduction:The Energy Cycle with aC arbon-Neutral Footprint As mentioned above, the reduction of the levelso fC O 2 emitted in the atmosphere is subject to stricter and stricter regulations, having such levelso vercome the 400 ppm for the first time in 2016.…”

Section: Thermochemical Water Splitting For H 2 Productionmentioning

confidence: 99%

Sustainability and Nanomaterials in Concert

Melchionna

Fornasiero

2017

ChemCatChem

View full text Add to dashboard Cite

Sustainable energy and the environment are one of the central priorities for our society, triggering a massive capital investment on research to define new trajectories for bypassing fossil fuel dependence and move to clean energy and consequent pollution abatement. The last decade has witnessed the rise and establishment of nanomaterials as frontrunners for a real societal impact of key processes under investigation, such as sustainable hydrogen production and CO2 conversion to fuels. The enormous progress achieved has been made possible by the opportunity to better understand materials at the nanoscale through the use of more powerful characterization techniques and advanced synthetic strategies. The lesson learned is that appropriately engineered multicomponent nanomaterials may hold the key to the routine industrial establishment of new greener concepts of energy production, with strong repercussions to the quality of life

show abstract

“…Analogous to FeVO4 and Mn2V2O7, copper vanadates before were only considered as battery materials or other applications. [81][82][83][84] Copper vanadate system is taken into account for water splitting more recently. Cu3V2O8…”

Section: Copper Vanadatementioning

confidence: 99%

Investigating cation-substituted metal vanadate photoanodes for solar water splitting

Zhang¹

View full text Add to dashboard Cite

As a promising way to harvest solar energy, photoelectrochemical (PEC) water splitting has attracted intensive interest and attention in recent years. Some issues remain in the field of PEC water splitting and the choice of photoanode is an important problem. Recent decade has witnessed the rapid development of BiVO4 as one of the most successful photoanodes. While it has achieved 90% of its theoretical photocurrent, further improvement is limited by its relatively large bandgap 2.4 eV. Hence, to find alternative photoanode candidates with lower bandgap and comparable charge transport properties is urgently needed. This thesis aims to explore cation substituted metal vanadates which have lower bandgap than BiVO4 and comparable charge transport properties. First, the properties of BiVO4 and the role of catalyst have been explored to understand the limitation of BiVO4 photoanode. Next, Fe was incorporated into BiVO4 system to partially substitute Bi to create a mixture of BiVO4 and FeVO4. All the mixed metal vanadate photoanodes indeed have lower bandgap than BiVO4. PEC measurements show that Bi/Fe in 1:1 ratio has the highest performance and the bandgap has lowered to 2.2 eV. The heterojunction between BiVO4 and FeVO4 is also confirmed to be beneficial to charge separation. FeVO4 has a near-optimal bandgap around 2.07 eV, but its photocurrent achieved has been an order lower than BiVO4. The intrinsic properties of this compound are not available in the literature and hence limit its development as a potential photoanode. In this thesis, a series of characterizations have been carried out for the first time to determine the intrinsic properties and to understand the performance limiting factor. It is found that the performance of FeVO4 is limited by its poor charge carrier separation. With the help of microwave conductivity measurements, the origin of inefficient charge separation is attributed to the low carrier mobility. Doping has been applied to improve the carrier concentration and mobility, but the absolute photocurrent increase is limited and separation efficiency still remains low.

show abstract

Structure and SO3 decomposition activity of nCuO–V2O5/SiO2 (n= 0, 1, 2, 3 and 5) catalysts for solar thermochemical water splitting cycles

Cited by 35 publications

References 29 publications

Structure and SO3 decomposition activity of CeVO4/SiO2 catalysts for solar thermochemical water splitting cycles

Structure and SO3 decomposition activity of CeVO4/SiO2 catalysts for solar thermochemical water splitting cycles

Sustainability and Nanomaterials in Concert

Investigating cation-substituted metal vanadate photoanodes for solar water splitting

Contact Info

Product

Resources

About