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Advanced Materials for CO2 Conversion
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Advanced Materials for CO2 Conversion

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Materials Chemistry".

Deadline for manuscript submissions: closed (30 September 2023) | Viewed by 1069

Special Issue Editor

Dr. Vicente Montes

E-Mail Website
Guest Editor
Department of Chemical Engineering and Physical Chemistry, University of Extremadura, 06006 Badajoz, Spain
Interests: heterogeneous catalysis; activated carbon; CO2 photoreduction or artificial photosynthesis; water pollutant valorization
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

At present, the CO2 concentration in the atmosphere is increasing due to human activity, having a negative environmental impact in many ecosystems. There are several approaches to mitigate this phenomena: reduce emissions, capture CO2 from the atmosphere, and convert it to valuable chemicals. A profitable technology for CO2 conversion to valuable products would drive industrial implementation. During the last decade, many procedures/technologies have been developed; it is likely that not only one solution, but a combination of several procedures, will help to restore the CO2 levels. However, in the short term, there is a special interest in CO2 conversion to fuels, as this technology would cycle the CO2 emitted by industries and activities based on fossil fuel and considerably reduce their carbon footprint.

The aim of this Special Issue is to cover the research trends on materials for CO2 conversion. Full papers, short communications, and reviews in this field are welcome. Mini-reviews with an overview on the state of the art with the future perspectives and trends will be also considered. 

Dr. Vicente Montes
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Materials is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • CO2 conversion
  • CO2 reduction
  • CO2 to fuels
  • artificial photosynthesis

Published Papers (1 paper)

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Research

18 pages, 4178 KiB  
Article
Photo- and Thermocatalytic CO2 Methanation: A Comparison of Ni/Al2O3 and Ni–Ce Hydrotalcite-Derived Materials under UV and Visible Light
by Rafael Canales and Victoria Laura Barrio
Materials 2023, 16(17), 5907; https://doi.org/10.3390/ma16175907 - 29 Aug 2023
Viewed by 798
Abstract
Catalysts derived from Ni/Al/Mg/Ce hydrotalcite were prepared via a co-precipitation method, varying the Ce/Al atomic ratio. All of the catalytic systems thus prepared were tested for CO2 methanation under dark and photocatalytic conditions (visible and ultraviolet) under continuous flow with the light [...] Read more.
Catalysts derived from Ni/Al/Mg/Ce hydrotalcite were prepared via a co-precipitation method, varying the Ce/Al atomic ratio. All of the catalytic systems thus prepared were tested for CO2 methanation under dark and photocatalytic conditions (visible and ultraviolet) under continuous flow with the light intensity set to 2.4 W cm−2. The substitution of Al by Ce formed a solid solution, generating oxygen vacancies and Ce3+/Ce4+ ions that helped shift the dissociation of CO2 towards the production of CH4, thus enhancing the activity of methanation, especially at lower temperatures (<523 K) and with visible light at temperatures where other catalysts were inactive. Additionally, for comparison purposes, Ni/Al2O3-based catalysts prepared via wetness impregnation were synthesized with different Ni loadings. Analytical techniques were used for the characterization of the systems. The best results in terms of activity were as follows: Hydrotalcite with Ce promoter > Hydrotalcite without Ce promoter > 25Ni/Al2O3 > 13Ni/Al2O3. Hydrotalcite, with a Ce/Al atomic ratio of 0.22 and a Ni content of 23 wt%, produced 7.74 mmol CH4 min−1·gcat at 473 K under visible light. Moreover, this catalyst exhibited stable photocatalytic activity during a 24 h reaction time with a CO2 conversion rate of 65% and CH4 selectivity of >98% at 523 K. This photocatalytic Sabatier enhancement achieved activity at lower temperatures than those reported in previous publications. Full article
(This article belongs to the Special Issue Advanced Materials for CO2 Conversion)
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