Highly active copper-ceria and copper-ceria-titania catalysts for methanol synthesis from CO
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Graciani, Jesús; Mudiyanselage, Kumudu; Xu, Fang; Baber, Ashleigh E.; Evans, Jonathan P.; Senanayake, Sanjaya D.; Stacchiola, Darı́o; Liu, Ping; Hrbek, Jan; Sanz, Javier Fernández; Rodríguez, José A.

doi:10.1126/science.1253057

Cited by 1,243 publications

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“…Its use for the production of chemicals is doubly beneficial, since in addition to its availability, it would represent a decrease in the carbon footprint for the manufacturing of the particular chemical. Catalytic processes are crucial for improving efficiency and conversion in the use of CO 2 for the manufacture of a wide range of substances, including methanol [1][2][3][4], carboxylic acids [1,4], polycarbonates [1,4,5], polylactones [1,6] or hydrocarbons [1,4,7,8]. As a particularly important matter, the catalytic production of hydrocarbon fuels from CO 2 constitutes a highly desirable strategy for the potential of closing the carbon cycle in future energy schemes.…”

Section: Introductionmentioning

confidence: 99%

Copper-doped titania photocatalysts for simultaneous reduction of CO2 and production of H2 from aqueous sulfide

Gonell

Puga

Julián‐López

et al. 2016

Applied Catalysis B: Environmental

110

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Copper-doped titanium dioxide materials with anatase phase (Cu-TiO 2 , atomic Cu contents ranging from 0 to 3% relative to the sum of Cu and Ti), and particle sizes of 12-15 nm, were synthesised by a solvo-thermal method using ethanol as the solvent and small amounts of water to promote the hydrolysis-condensation processes. Diffuse reflectance UV-vis spectroscopy show that the edges of absorption of the titania materials are somewhat shifted to higher wavelengths due to the presence of Cu. X-Ray Photoelectron Spectroscopy (XPS) indicate that Cu(II) is predominant. Photocatalytic CO 2 reduction experiments were performed in aqueous Cu-TiO 2 suspensions under UV-rich light and in the presence of different solutes. Sulfide was found to promote the efficient production of H 2 from water and formic acid from CO 2 . The effect of the Cu content on the photoactivity of Cu-TiO 2 was also studied, showing that copper plays a role on the photocatalytic reduction of CO 2 . IntroductionCarbon dioxide is an inexpensive and widely available feedstock. Its use for the production of chemicals is doubly beneficial, since in addition to its availability, it would represent a decrease in the carbon footprint for the manufacturing of the particular chemical. Other researchers have reported lower but noticeable methanol yields using similarly prepared photocatalysts and Hg lamp irradiation (10-23 µmol g cat −1 h −1 ) [19,20]. In gas-phase reactions, the formation of methanol was also reported, but in considerably lower yields (2 nmol g cat −1 h −1 ), being methane the major product formed by Cu/TiO 2 photocatalysis [21]. In contrast, similar materials were found to promote the formation of several hydrocarbons including methane, ethane and ethylene in conjunction with larger amounts of H 2 [22], whereas CO and methane were major products found in a more recent study [23]. A significant degree of discrepancy regarding the identity of the reaction products (in addition to their selectivities and yields) is apparent by considering the aforementioned literature data, although this could be in part due to the different synthetic procedures used for the preparation of the photocatalysts and to the varied irradiation conditions used.Despite the notable progress in this field of research, there is no clear trend which may allow to conclude on the actual mechanistic route and to gain knowledge on the role of copper on the reaction. Thorough kinetic and in situ spectroscopic studies would provide valuable information on the reaction at the surface of the photocatalyst and may guide future design of more active copper-titania materials. An important issue to focus on is the possible back-reactions of the reduction products on the photocatalyst. For example, it was observed that methanol and formaldehyde, initially formed by a photocatalytic process using Cu(0) powder and TiO 2 , were 3 rapidly consumed by in situ formed Cu/TiO 2 [24]. The simultaneous occurrence of CO 2 reduction and decomposition of the products should result in stat...

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Section: Introductionmentioning

confidence: 99%

Copper-doped titania photocatalysts for simultaneous reduction of CO2 and production of H2 from aqueous sulfide

Gonell

Puga

Julián‐López

et al. 2016

Applied Catalysis B: Environmental

110

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“…[1][2][3][4] Among them, a class of nanomaterials with enzyme mimetic properties has been reported, such as ferromagnetic nanoparticles, copper nanoclusters, fullerene derivatives, gold nanoparticles and rare earth nanoparticles. [5][6][7][8][9][10] They are regarded as potential alternatives to natural enzymes, and have already been widely applied in numerous fields, such as biosensors, immunoassays, cancer therapy, pharmaceutical processes, pollutant removal, and the food industry etc.…”

Section: Introductionmentioning

confidence: 99%

Ceria Nanoparticles as Enzyme Mimetics

Wang

Zhang

et al. 2017

Chin. J. Chem.

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In the past decades, enzyme mimetics based on ceria nanoparticles (nanoceria) have been developed as potential substitutes for nature enzymes. The mixed valence states of cerium and the patterns of oxygen vacancies on crystal planes result in different enzyme mimetic activities. In this review we survey the bio-applications of nanoceria-based enzyme mimetics as well as the underlying mechanisms. Factors influencing the enzyme mimetic activities and future perspective of nanoceria-based enzyme mimetics are also addressed.

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“…Direct conversion of CO 2 into methanol employs a Cu/ZnO − Al 2 O 3 catalyst [22]. Larger production rates are reported on a copper-ceria interface acting as a catalyst [23]. Large scale deployment of CSP makes use of a heliostat, a vast array of concave mirrors tracking the motion of the sun and pointing the focussed light beam at an oven to reach temperatures over 1000…”

Section: Lnes 2014mentioning

confidence: 99%

“…07002-p.5 [19][20][21][22][23][24]. b) Indirect conversion of renewable energy into hydrocarbons through electricity production.…”

Section: Lnes 2014mentioning

confidence: 99%

CO₂-neutral fuels

Goede

2015

EPJ Web of Conferences

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Summary. -The need for storage of renewable energy (RE) generated by photovoltaic, concentrated solar and wind arises from the fact that supply and demand are ill-matched both geographically and temporarily. This already causes problems of overcapacity and grid congestion in countries where the fraction of RE exceeds the 20% level. A system approach is needed, which focusses not only on the energy source, but includes conversion, storage, transport, distribution, use and, last but not least, the recycling of waste. Furthermore, there is a need for more flexibility in the energy system, rather than relying on electrification, integration with other energy systems, for example the gas network, would yield a system less vulnerable to failure and better adapted to requirements. For example, long-term large-scale storage of electrical energy is limited by capacity, yet needed to cover weekly to seasonal demand. This limitation can be overcome by coupling the electricity net to the gas system, considering the fact that the Dutch gas network alone has a storage capacity of 552 TWh, sufficient to cover the entire EU energy demand for over a month. This lecture explores energy storage in chemicals bonds. The focus is on chemicals other than hydrogen, taking advantage of the higher volumetric energy density of hydrocarbons, in this case methane, which has an approximate 3.5 times higher volumetric energy density. More importantly, it allows the ready use of existing gas infrastructure for energy storage, transport and distribution. Intermittent wind electricity generated is converted into synthetic methane, the Power to Gas (P2G) scheme, by splitting feedstock CO2 and H2O into synthesis gas, a mixture of CO and H2. Syngas plays a central role in the synthesis of a range of hydrocarbon products, including methane, diesel and dimethyl ether. The splitting is accomplished by innovative means; plasmolysis and high-temperature solid oxygen electrolysis. A CO2-neutral fuel cycle is established by powering the conversion step by renewable energy and recapturing the CO2 emitted after combustion, ultimately from the surrounding air to cover emissions from distributed source. Carbon Capture and Utilisation (CCU) coupled to P2G thus creates a CO2-neutral energy system based on synthetic hydrocarbon fuel. It would enable a circular economy where the carbon cycle is closed by recovering the CO2 emitted after reuse of synthetic hydrocarbon fuel. The critical step, technically as well as economically, is the conversion of feedstock CO2/H2O into syngas rather than the capture of CO2 from ambient air.

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Highly active copper-ceria and copper-ceria-titania catalysts for methanol synthesis from CO ₂

Cited by 1,243 publications

References 45 publications

Copper-doped titania photocatalysts for simultaneous reduction of CO2 and production of H2 from aqueous sulfide

Copper-doped titania photocatalysts for simultaneous reduction of CO2 and production of H2 from aqueous sulfide

Ceria Nanoparticles as Enzyme Mimetics

CO₂-neutral fuels

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Highly active copper-ceria and copper-ceria-titania catalysts for methanol synthesis from CO 2

Cited by 1,243 publications

References 45 publications

Copper-doped titania photocatalysts for simultaneous reduction of CO2 and production of H2 from aqueous sulfide

Copper-doped titania photocatalysts for simultaneous reduction of CO2 and production of H2 from aqueous sulfide

Ceria Nanoparticles as Enzyme Mimetics

CO2-neutral fuels

Contact Info

Product

Resources

About

Highly active copper-ceria and copper-ceria-titania catalysts for methanol synthesis from CO ₂

CO₂-neutral fuels