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Bifunctional Metal Oxides as Heterogeneous Catalysis for CO2 Adsorption...
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Bifunctional Metal Oxides as Heterogeneous Catalysis for CO2 Adsorption and Conversion

A special issue of Nanomaterials (ISSN 2079-4991). This special issue belongs to the section "Energy and Catalysis".

Deadline for manuscript submissions: closed (31 August 2022) | Viewed by 12705

Special Issue Editors

Dr. Poernomo Gunawan

E-Mail Website
Guest Editor
School of Chemical & Biomedical Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore
Interests: layered double hydroxides; nanomaterial synthesis; biomass conversion; CO2 capture and conversion; chemical engineering education
Prof. Dr. Ziyi Zhong

E-Mail Website
Guest Editor
College of Engineering, Guangdong Technion Israel Insitute of Technology, Shantou 515063, China
Interests: heterogeneous catalysis; environmental science; surface chemistry; wastewater treatment; material chemistry

Special Issue Information

Dear Colleagues,

Since the Paris agreement in 2015, global efforts have intensified to mitigate the effect of climate change and reduce greenhouse gas emissions, in particular CO2. Carbon capture and sequestration (CCS) that employ different types of adsorbents/sorbents involving liquid amines, basic solids, and porous materials has been widely reported and enable the concentration, purification, and storage of CO2 from flue gas. However, the regeneration of adsorbents/sorbents relies on the high temperature thermal swing. In addition, the storage and transportation of concentrated CO2 require high pressure, thus making the CCS process highly energy-intensive. To address the associated challenges, dual-function materials (DFMs) are currently being researched as a means to effectively capture and convert CO2 to value-added products, such as syngas, fuels, or chemical feedstock. DFMs typically comprise both an adsorbent/sorbent and a catalytic component for CO2 capture and conversion, respectively. The former usually consists of alkali metal oxides or carbonates, whereas the latter transition metal oxides, such as Ni and Cu, or noble metals, such as Ru and Rh.

This Special Issue will cover recent developments in the synthesis, characterization, and evaluation of dual-function materials based on metal oxides and their hybrids with other materials, such as noble metal nanoparticles, basic metal oxides, carbon nitrides, etc., as effective materials for CO2 capture, conversion, or both.

Dr. Poernomo Gunawan
Prof. Dr. Ziyi Zhong
Guest Editors

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. Nanomaterials 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 2900 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

  • Dual-function materials
  • Metal oxides
  • Nanohybrid
  • Nanocomposite
  • CO2 adsorption
  • CO2 capture
  • CO2 conversion
  • CO2 hydrogenation
  • Reverse water gas shift

Published Papers (5 papers)

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Research

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14 pages, 30375 KiB  
Article
Silica-Decorated NiAl-Layered Double Oxide for Enhanced CO/CO2 Methanation Performance
by Wenxia Yan, Yangyang Li, Junming Zeng, Wentao Bao, Huanhuan Zhao, Jiangbing Li, Poernomo Gunawan and Feng Yu
Nanomaterials 2022, 12(17), 3041; https://0-doi-org.brum.beds.ac.uk/10.3390/nano12173041 - 01 Sep 2022
Cited by 3 | Viewed by 1381
Abstract
CO/CO2 hydrogenation has attracted much attention as a pathway to achieve carbon neutrality and production of synthetic natural gas (SNG). In this work, two-dimensional NiAl layered double oxide (2D NiAl-LDO) has been successfully decorated by SiO2 nanoparticles derived from SiCl4 [...] Read more.
CO/CO2 hydrogenation has attracted much attention as a pathway to achieve carbon neutrality and production of synthetic natural gas (SNG). In this work, two-dimensional NiAl layered double oxide (2D NiAl-LDO) has been successfully decorated by SiO2 nanoparticles derived from SiCl4 and used as CO/CO2 methanation catalysts. The as-obtained H-SiO2-NiAl-LDO exhibited a large specific surface area of 201 m2/g as well as high ratio of metallic Ni0 species and surface adsorption oxygen that were beneficial for low-temperature methanation of CO/CO2. The conversion of CO methanation was 99% at 400 °C, and that of CO2 was 90% at 350 °C. At 250 °C, the CO methanation reached 85% whereas that of CO2 reached 23% at 200 °C. We believe that this provides a simple method to improve the methanation performance of CO and CO2 and a strategy for the modification of other similar catalysts. Full article
(This article belongs to the Special Issue Bifunctional Metal Oxides as Heterogeneous Catalysis for CO2 Adsorption and Conversion)
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15 pages, 6565 KiB  
Article
CO2 Activation and Hydrogenation on Cu-ZnO/Al2O3 Nanorod Catalysts: An In Situ FTIR Study
by Letian Wang, Ubong Jerome Etim, Chenchen Zhang, Lilac Amirav and Ziyi Zhong
Nanomaterials 2022, 12(15), 2527; https://0-doi-org.brum.beds.ac.uk/10.3390/nano12152527 - 23 Jul 2022
Cited by 8 | Viewed by 2995
Abstract
CuZnO/Al2O3 is the industrial catalyst used for methanol synthesis from syngas (CO + H2) and is also promising for the hydrogenation of CO2 to methanol. In this work, we synthesized Al2O3 nanorods (n-Al2 [...] Read more.
CuZnO/Al2O3 is the industrial catalyst used for methanol synthesis from syngas (CO + H2) and is also promising for the hydrogenation of CO2 to methanol. In this work, we synthesized Al2O3 nanorods (n-Al2O3) and impregnated them with the CuZnO component. The catalysts were evaluated for the hydrogenation of CO2 to methanol in a fixed-bed reactor. The support and the catalysts were characterized, including via in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS). The study of the CO2 adsorption, activation, and hydrogenation using in situ DRIFT spectroscopy revealed the different roles of the catalyst components. CO2 mainly adsorbed on the n-Al2O3 support, forming carbonate species. Cu was found to facilitate H2 dissociation and further reacted with the adsorbed carbonates on the n-Al2O3 support, transforming them to formate or additional intermediates. Like the n-Al2O3 support, the ZnO component contributed to improving the CO2 adsorption, facilitating the formation of more carbonate species on the catalyst surface and enhancing the efficiency of the CO2 activation and hydrogenation into methanol. The synergistic interaction between Cu and ZnO was found to be essential to increase the space–time yield (STY) of methanol but not to improve the selectivity. The 3% CuZnO/n-Al2O3 displayed improved catalytic performance compared to 3% Cu/n-Al2O3, reaching a CO2 conversion rate of 19.8% and methanol STY rate of 1.31 mmolgcat−1h−1 at 300 °C. This study provides fundamental and new insights into the distinctive roles of the different components of commercial methanol synthesis catalysts. Full article
(This article belongs to the Special Issue Bifunctional Metal Oxides as Heterogeneous Catalysis for CO2 Adsorption and Conversion)
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17 pages, 3345 KiB  
Article
CeO2-Promoted PtSn/SiO2 as a High-Performance Catalyst for the Oxidative Dehydrogenation of Propane with Carbon Dioxide
by Li Wang, Guo-Qing Yang, Xing Ren and Zhong-Wen Liu
Nanomaterials 2022, 12(3), 417; https://0-doi-org.brum.beds.ac.uk/10.3390/nano12030417 - 27 Jan 2022
Cited by 10 | Viewed by 3073
Abstract
The oxidative dehydrogenation of propane with CO2 (CO2-ODP) has been extensively investigated as a promising green technology for the efficient production of propylene, but the lack of a high-performance catalyst is still one of the main challenges for its industrial [...] Read more.
The oxidative dehydrogenation of propane with CO2 (CO2-ODP) has been extensively investigated as a promising green technology for the efficient production of propylene, but the lack of a high-performance catalyst is still one of the main challenges for its industrial application. In this work, an efficient catalyst for CO2-ODP was developed by adding CeO2 to PtSn/SiO2 as a promoter via the simple impregnation method. Reaction results indicate that the addition of CeO2 significantly improved the catalytic activity and propylene selectivity of the PtSn/SiO2 catalyst, and the highest space-time yield of 1.75 g(C3H6)·g(catalyst)−1·h−1 was achieved over PtSn/SiO2 with a Ce loading of 6 wt%. The correlation of the reaction results with the characterization data reveals that the introduction of CeO2 into PtSn/SiO2 not only improved the Pt dispersion but also regulated the interaction between Pt and Sn species. Thus, the essential reason for the promotional effect of CeO2 on CO2-ODP performance was rationally ascribed to the enhanced adsorption of propane and CO2 originating from the rich oxygen defects of CeO2. These important understandings are applicable in further screening of promoters for the development of a high-performance Pt-based catalyst for CO2-ODP. Full article
(This article belongs to the Special Issue Bifunctional Metal Oxides as Heterogeneous Catalysis for CO2 Adsorption and Conversion)
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16 pages, 6683 KiB  
Article
CO2 Adsorption Performance and Kinetics of Ionic Liquid-Modified Calcined Magnesite
by Na Yang, Rong Xue, Guibo Huang, Yunqian Ma and Junya Wang
Nanomaterials 2021, 11(10), 2614; https://0-doi-org.brum.beds.ac.uk/10.3390/nano11102614 - 05 Oct 2021
Cited by 4 | Viewed by 1564
Abstract
CO2 is a major contributor to global warming, and considerable efforts have been undertaken to capture and utilise it. Herein, a nanomaterial based on ionic liquid (IL)–modified calcined magnesites was investigated for CO2 capture. The synthesised nanomaterial (magnesite modified using [APMIM]Br) [...] Read more.
CO2 is a major contributor to global warming, and considerable efforts have been undertaken to capture and utilise it. Herein, a nanomaterial based on ionic liquid (IL)–modified calcined magnesites was investigated for CO2 capture. The synthesised nanomaterial (magnesite modified using [APMIM]Br) exhibited the best adsorption performance of 1.34 mmol/g at 30% IL loading amount, 50 °C, 0.4 MPa and 150 mL/min. In particular, the obtained nanomaterial could be regenerated at a low temperature of 90 °C for 3 h, and its CO2 adsorption capacity of 0.81 mmol/g was retained after eight cycles. FT-IR results showed that the imidazole ring and C–N group are directly related to CO2 adsorption capacity. Moreover, improving the conjugative effect of the imidazole ring enhanced the adsorption performance. Further, CO2 was adsorbed on the adsorbent surface and incomplete desorption decreased the BET surface area and CO2 adsorption capacity. Additionally, four models were selected to fit the adsorption kinetics. The results show that the adsorption mechanism fits the pseudo-first-order model well. Full article
(This article belongs to the Special Issue Bifunctional Metal Oxides as Heterogeneous Catalysis for CO2 Adsorption and Conversion)
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Review

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40 pages, 5083 KiB  
Review
Impacts of the Catalyst Structures on CO2 Activation on Catalyst Surfaces
by Ubong J. Etim, Chenchen Zhang and Ziyi Zhong
Nanomaterials 2021, 11(12), 3265; https://0-doi-org.brum.beds.ac.uk/10.3390/nano11123265 - 30 Nov 2021
Cited by 36 | Viewed by 5380
Abstract
Utilizing CO2 as a sustainable carbon source to form valuable products requires activating it by active sites on catalyst surfaces. These active sites are usually in or below the nanometer scale. Some metals and metal oxides can catalyze the CO2 transformation [...] Read more.
Utilizing CO2 as a sustainable carbon source to form valuable products requires activating it by active sites on catalyst surfaces. These active sites are usually in or below the nanometer scale. Some metals and metal oxides can catalyze the CO2 transformation reactions. On metal oxide-based catalysts, CO2 transformations are promoted significantly in the presence of surface oxygen vacancies or surface defect sites. Electrons transferable to the neutral CO2 molecule can be enriched on oxygen vacancies, which can also act as CO2 adsorption sites. CO2 activation is also possible without necessarily transferring electrons by tailoring catalytic sites that promote interactions at an appropriate energy level alignment of the catalyst and CO2 molecule. This review discusses CO2 activation on various catalysts, particularly the impacts of various structural factors, such as oxygen vacancies, on CO2 activation. Full article
(This article belongs to the Special Issue Bifunctional Metal Oxides as Heterogeneous Catalysis for CO2 Adsorption and Conversion)
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