Nanoporous Materials as New Engineered Catalysts for the Synthesis of Green Fuels

Fechete, Ioana; Védrine, J.C.

doi:10.3390/molecules20045638

Cited by 81 publications

(43 citation statements)

References 239 publications

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“…These minerals offer low-cost, effective supports for nano-scale entities. The reactivity of nano-scale zero-valent metals such as Ag and the high cation-exchange capacity of the zeolites represent a potential alternative for remediation applications [7,13,14,19]. However, specific studies about kinetics adsorption of nanoparticles on clinoptilolite have not been explored thoroughly.…”

Section: Introductionmentioning

confidence: 99%

Kinetic Adsorption Study of Silver Nanoparticles on Natural Zeolite: Experimental and Theoretical Models

Ruíz-Baltazar

Pérez

2015

Applied Sciences

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Abstract:In this research, the adsorption capacity of Ag nanoparticles on natural zeolite from Oaxaca is presented. In order to describe the adsorption mechanism of silver nanoparticles on zeolite, experimental adsorption models for Ag ions and Ag nanoparticles were carried out. These experimental data obtained by the atomic absorption spectrophotometry technique were compared with theoretical models such as Lagergren first-order, pseudo-second-order, Elovich, and intraparticle diffusion. Correlation factors R 2 of the order of 0.99 were observed. Analysis by transmission electron microscopy describes the distribution of the silver nanoparticles on the zeolite outer surface. Additionally, a chemical characterization of the material was carried out through a dilution process with lithium metaborate. An average value of 9.3 in the Si/Al ratio was observed. Factors such as the adsorption behavior of the silver ions and the Si/Al ratio of the zeolite are very important to support the theoretical models and establish the adsorption mechanism of Ag nanoparticles on natural zeolite.

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Section: Introductionmentioning

confidence: 99%

Kinetic Adsorption Study of Silver Nanoparticles on Natural Zeolite: Experimental and Theoretical Models

Ruíz-Baltazar

Pérez

2015

Applied Sciences

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“…Nanoporous materials, such as KIT-6, MCM-41, US-FAU, MFI, and mesoporous silica, can be used as a support for nanoparticles of metals (Ni, Ru, Rh, Co, Fe) for the catalytic and photocatalytic reduction of CO 2 to methane [88]. The role of the support dominates the design in terms of developing an efficient methanation catalyst, specifically with respect to ensuring enhanced metal dispersion and a long catalyst lifetime, because such support can prevent sintering and deactivation through coking, which otherwise blocks the metal surface as carbon accumulates.…”

Section: Photocatalysismentioning

confidence: 99%

Heterogeneous Catalysis on Metal Oxides

2017

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This review article contains a reminder of the fundamentals of heterogeneous catalysis and a description of the main domains of heterogeneous catalysis and main families of metal oxide catalysts, which cover acid-base reactions, selective partial oxidation reactions, total oxidation reactions, depollution, biomass conversion, green chemistry and photocatalysis. Metal oxide catalysts are essential components in most refining and petrochemical processes. These catalysts are also critical to improving environmental quality. This paper attempts to review the major current industrial applications of supported and unsupported metal oxide catalysts. Viewpoints for understanding the catalysts' action are given, while applications and several case studies from academia and industry are given. Emphases are on catalyst description from synthesis to reaction conditions, on main industrial applications in the different domains and on views for the future, mainly regulated by environmental issues. Following a review of the major types of metal oxide catalysts and the processes that use these catalysts, this paper considers current and prospective major applications, where recent advances in the science of metal oxide catalysts have major economic and environmental impacts.

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“…With regards to upcoming energy challenges, CO 2 conversion seems to be a more attractive and promising approach [2,3]. Considering that the consumption of fuels is two orders of magnitude higher than that of chemicals, CO 2 has to be mainly converted into energy carriers such as methane, methanol, and so on [4][5][6][7][8][9]. CO 2 methanation, also called the Sabatier reaction (CO 2 + 4H 2 ↔ CH 4 + 2H 2 O, ∆H 298K = −164.7 kJ/mol) [6], presents substantial advantages over CO 2 conversion to other fuels because methane can be injected directly into existing natural gas pipelines, or be used as a raw material for production of chemicals.…”

Section: Introductionmentioning

confidence: 99%

Methanation of Carbon Dioxide over Ni–Ce–Zr Oxides Prepared by One-Pot Hydrolysis of Metal Nitrates with Ammonium Carbonate

et al. 2017

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Ni-Ce-Zr mixed oxides were prepared through one-pot hydrolysis of mixed metal nitrates with ammonium carbonate for CO 2 methanation. The effects of Ce/Zr molar ratio and Ni content on catalysts' physical and chemical properties, reduction degree of Ni 2+ , and catalytic properties were systematically investigated. The results showed that Zr could lower metallic Ni particle sizes and alter interaction between Ni and supports, resulting in enhancements in the catalytic activity for CO 2 methanation. The Ni-Ce-Zr catalyst containing 40 wt % Ni and Ce/Zr molar ratio of 9:1 exhibited the optimal catalytic properties, with 96.2% CO 2 conversion and almost 100% CH 4 selectivity at a low temperature of 275 • C. During the tested period of 500 h, CO 2 conversion and CH 4 selectivity over Ni-Ce-Zr catalyst kept constant under 300 • C.

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Nanoporous Materials as New Engineered Catalysts for the Synthesis of Green Fuels

Cited by 81 publications

References 239 publications

Kinetic Adsorption Study of Silver Nanoparticles on Natural Zeolite: Experimental and Theoretical Models

Kinetic Adsorption Study of Silver Nanoparticles on Natural Zeolite: Experimental and Theoretical Models

Heterogeneous Catalysis on Metal Oxides

Methanation of Carbon Dioxide over Ni–Ce–Zr Oxides Prepared by One-Pot Hydrolysis of Metal Nitrates with Ammonium Carbonate

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