Dataset Information

Thermocatalytic CO₂ Conversion over a Nickel-Loaded Ceria Nanostructured Catalyst: A NAP-XPS Study.

ABSTRACT: Despite the increasing economic incentives and environmental advantages associated to their substitution, carbon-rich fossil fuels are expected to remain as the dominant worldwide source of energy through at least the next two decades and perhaps later. Therefore, both the control and reduction of CO₂ emissions have become environmental issues of major concern and big challenges for the international scientific community. Among the proposed strategies to achieve these goals, conversion of CO₂ by its reduction into high added value products, such as methane or syngas, has been widely agreed to be the most attractive from the environmental and economic points of view. In the present work, thermocatalytic reduction of CO₂ with H₂ was studied over a nanostructured ceria-supported nickel catalyst. Ceria nanocubes were employed as support, while the nickel phase was supported by means a surfactant-free controlled chemical precipitation method. The resulting nanocatalyst was characterized in terms of its physicochemical properties, with special attention paid to both surface basicity and reducibility. The nanocatalyst was studied during CO₂ reduction by means of Near Ambient Pressure X-ray Photoelectron Spectroscopy (NAP-XPS). Two different catalytic behaviors were observed depending on the reaction temperature. At low temperature, with both Ce and Ni in an oxidized state, CH₄ formation was observed, whereas at high temperature above 500 °C, the reverse water gas shift reaction became dominant, with CO and H₂O being the main products. NAP-XPS was revealed as a powerful tool to study the behavior of this nanostructured catalyst under reaction conditions.

SUBMITTER: Barroso-Bogeat A

PROVIDER: S-EPMC7913549 | biostudies-literature | 2021 Feb

REPOSITORIES: biostudies-literature

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Thermocatalytic CO<sub>2</sub> Conversion over a Nickel-Loaded Ceria Nanostructured Catalyst: A NAP-XPS Study.

Barroso-Bogeat Adrián A Blanco Ginesa G Pérez-Sagasti Juan José JJ Escudero Carlos C Pellegrin Eric E Herrera Facundo C FC Pintado José María JM

Materials (Basel, Switzerland) 20210203 4

Despite the increasing economic incentives and environmental advantages associated to their substitution, carbon-rich fossil fuels are expected to remain as the dominant worldwide source of energy through at least the next two decades and perhaps later. Therefore, both the control and reduction of CO<sub>2</sub> emissions have become environmental issues of major concern and big challenges for the international scientific community. Among the proposed strategies to achieve these goals, conversio ...[more]

PMID: 33546339

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Project description:BACKGROUND: The modern society primarily relies on petroleum and natural gas for the production of fuels and chemicals. One of the major commodity chemicals 1,2-propanediol (1,2-PDO), which has an annual production of more than 0.5 million tons in the United States, is currently produced by chemical processes from petroleum derived propylene oxide, which is energy intensive and not sustainable. In this study, we sought to achieve photosynthetic production of 1,2-PDO from CO2 using a genetically engineered cyanobacterium Synechococcus elongatus PCC 7942. Compared to the previously reported biological 1,2-PDO production processes which used sugar or glycerol as the substrates, direct chemical production from CO2 in photosynthetic organisms recycles the atmospheric CO2 and will not compete with food crops for arable land. RESULTS: In this study, we reported photosynthetic production of 1,2-PDO from CO2 using a genetically engineered cyanobacterium Synechococcus elongatus PCC 7942. Introduction of the genes encoding methylglyoxal synthase (mgsA), glycerol dehydrogenase (gldA), and aldehyde reductase (yqhD) resulted in the production of ~22 mg/L 1,2-PDO from CO2. However, a comparable amount of the pathway intermediate acetol was also produced, especially during the stationary phase. The production of 1,2-PDO requires a robust input of reducing equivalents from cellular metabolism. To take advantage of cyanobacteria's NADPH pool, the synthetic pathway of 1,2-PDO was engineered to be NADPH-dependent by exploiting the NADPH-specific secondary alcohol dehydrogenases which have not been reported for 1,2-PDO production previously. This optimization strategy resulted in the production of ~150 mg/L 1,2-PDO and minimized the accumulation of the incomplete reduction product, acetol. CONCLUSION: This work demonstrated that cyanobacteria can be engineered as a catalyst for the photosynthetic conversion of CO2 to 1,2-PDO. This work also characterized two NADPH-dependent sADHs for their catalytic capacity in 1,2-PDO formation, and suggested that they may be useful tools for renewable production of reduced chemicals in photosynthetic organisms.

Dataset Information

Thermocatalytic CO₂ Conversion over a Nickel-Loaded Ceria Nanostructured Catalyst: A NAP-XPS Study.

Publications

Thermocatalytic CO<sub>2</sub> Conversion over a Nickel-Loaded Ceria Nanostructured Catalyst: A NAP-XPS Study.

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Dataset Information

Thermocatalytic CO2 Conversion over a Nickel-Loaded Ceria Nanostructured Catalyst: A NAP-XPS Study.

Publications

Thermocatalytic CO<sub>2</sub> Conversion over a Nickel-Loaded Ceria Nanostructured Catalyst: A NAP-XPS Study.

Similar Datasets

OmicsDI is part of the ELIXIR infrastructure

Tweets

Thermocatalytic CO₂ Conversion over a Nickel-Loaded Ceria Nanostructured Catalyst: A NAP-XPS Study.