Utilization of carbon nanotube and graphene in electrochemical CO2 reduction

The electrochemical reduction of carbon dioxide (ERCO2) driven by renewable energy to produce low-carbon fuels and value-added chemicals has been well known as a way capable of simultaneously solving energy exhaustion and global warming issue. Catalysts play a vital role in low temperature ERCO2, and those well used are single metals, metal oxides and alloys. Due to the characteristics of nanometer size, low resistance, high surface area, chemical stability, special mechanical and electronic properties, some novel carbon nomaterials (e.g. carbon nanotubes (CNTs) and graphene) show excellent properties in ERCO2 as catalysts or supports which can improve the electrochemical performance: activity, selectivity, and stability. Actually, they mostly act as support materials and little directly as catalysts. The specific surface area and the active sites of loaded catalysts can be increased, then the performance is significantly improved. In this work, we will make a review on the progress as to CNTs and graphene as catalysts and supports in ERCO2 in recent years and give the future prospects.

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Spidery catalyst for the synthesis of quinazoline-2,4(1H,3H)-diones

Catalysis Science & Technology ◽

10.1039/c5cy01543j ◽

2016 ◽

Vol 6 (5) ◽

pp. 1435-1441 ◽

Cited By ~ 33

Author(s):

Seyed Mohsen Sadeghzadeh

Keyword(s):

Surface Area ◽

Active Sites ◽

High Surface ◽

High Surface Area

In this study, a novel fibrous nanosilica (KCC-1) based nanocatalyst (Au, Pd, and Cu) with a high surface area and easy accessibility of active sites was successfully developed by a facile approach.

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Enhancement of Photocatalytic Oxidation of Glucose to Value-Added Chemicals on TiO2 Photocatalysts by A Zeolite (Type Y) Support and Metal Loading

Catalysts ◽

10.3390/catal10040423 ◽

2020 ◽

Vol 10 (4) ◽

pp. 423 ◽

Cited By ~ 2

Author(s):

Kamonchanok Roongraung ◽

Surawut Chuangchote ◽

Navadol Laosiripojana

Keyword(s):

Formic Acid ◽

Surface Area ◽

Gluconic Acid ◽

Photocatalytic Oxidation ◽

High Surface ◽

Sol Gel ◽

High Surface Area ◽

Value Added ◽

Incipient Wetness Impregnation ◽

Microwave Assisted

TiO2-based photocatalysts synthesized by the microwave-assisted sol-gel method was tested in the photocatalytic glucose conversion. Modifications of TiO2 with type-Y zeolite (ZeY) and metals (Ag, Cu, and Ag-Cu) were developed for increasing the dispersion of TiO2 nanoparticles and increasing the photocatalytic activity. Effects of the TiO2 dosage to zeolite ratio (i.e., TiO2/ZeY of 10, 20, 40, and 50 mol %) and the silica to alumina ratio in ZeY (i.e., SiO2:Al2O3 of 10, 100, and 500) were firstly studied. It was found that the specific surface area of TiO2/ZeY was 400–590 m2g−1, which was higher than that of pristine TiO2 (34.38 m2g−1). The good properties of 20%TiO2/ZeY photocatalyst, including smaller particles (13.27 nm) and high surface area, could achieve the highest photocatalytic glucose conversion (75%). Yields of gluconic acid, arabinose, xylitol, and formic acid obtained from 20%TiO2/ZeY were 9%, 26%, 4%, and 35%, respectively. For the effect of the silica to alumina ratio, the highest glucose conversion was obtained from SiO2:Al2O3 ratio of 100. Interestingly, it was found that the SiO2:Al2O3 ratio affected the selectivity of carboxylic products (gluconic acid and formic acid). At a low ratio of silica to alumina (SiO2:Al2O3 = 10), higher selectivity of the carboxylic products (gluconic acid = 29% and formic acid = 32%) was obtained (compared with other higher ratios). TiO2/ZeY was further loaded by metals using the microwave-assisted incipient wetness impregnation technique. The highest glucose conversion of 96.9 % was obtained from 1 wt. % Ag-TiO2 (40%)/ZeY. Furthermore, the bimetallic Ag-Cu-loaded TiO2/ZeY presented the highest xylitol yield of 12.93%.

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Catalytic Cracking of n-Hexadecane Using Carbon Nanostructures/Nano-Zeolite-Y Composite Catalyst

Catalysts ◽

10.3390/catal10121385 ◽

2020 ◽

Vol 10 (12) ◽

pp. 1385

Author(s):

Botagoz Zhuman ◽

Shaheen Fatima Anis ◽

Saepurahman ◽

Gnanapragasam Singravel ◽

Raed Hashaikeh

Keyword(s):

Surface Area ◽

Catalytic Cracking ◽

Carbon Nanostructures ◽

Active Sites ◽

Zeolite Y ◽

High Surface ◽

High Surface Area ◽

Composite Catalyst ◽

Homogeneous Distribution ◽

Binding Material

Zeolite-based catalysts are usually utilized in the form of a composite with binders, such as alumina, silica, clay, and others. However, these binders are usually known to block the accessibility of the active sites in zeolites, leading to a decreased effective surface area and agglomeration of zeolite particles. The aim of this work is to utilize carbon nanostructures (CNS) as a binding material for nano-zeolite-Y particles. The unique properties of CNS, such as its high surface area, thermal stability, and flexibility of its fibrous structure, makes it a promising material to hold and bind the nano-zeolite particles, yet with a contemporaneous accessibility of the reactants to the porous zeolite structure. In the current study, a nano-zeolite-Y/CNS composite catalyst was fabricated through a ball milling approach. The catalyst possesses a high surface area of 834 m2/g, which is significantly higher than the conventional commercial cracking catalysts. Using CNS as a binding material provided homogeneous distribution of the zeolite nanoparticles with high accessibility to the active sites and good mechanical stability. In addition, CNS was found to be an effective binding material for nano-zeolite particles, solving their major drawback of agglomeration. The nano-zeolite-Y/CNS composite showed 80% conversion for hexadecane catalytic cracking into valuable olefins and hydrogen gas, which was 14% higher compared to that of pure nano-zeolite-Y particles.

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Ultrasonic-assisted preparation of highly active Co3O4/MCM-41 adsorbent and its desulfurization performance for low H2S concentration gas

RSC Advances ◽

10.1039/d0ra05606e ◽

2020 ◽

Vol 10 (50) ◽

pp. 30214-30222

Author(s):

Bolong Jiang ◽

Jiaojing Zhang ◽

Yanguang Chen ◽

Hua Song ◽

Tianzhen Hao ◽

...

Keyword(s):

Surface Area ◽

Active Sites ◽

High Surface ◽

High Surface Area ◽

Highly Active ◽

Ultrasonic Assisted ◽

Sulfur Capacity ◽

Mcm 41

Co3O4/MCM-41 adsorbent with high surface area and more active sites was successfully prepared by ultrasonic assisted impregnation (UAI) technology and it has been found that the sulfur capacity was improved by 33.2% because of ultrasonication.

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Supported cyanides: the interaction of potassium cyanide with high surface area inorganic support materials and the development of highly reactive cyanide reagents

The Journal of Organic Chemistry ◽

10.1021/jo00208a046 ◽

1985 ◽

Vol 50 (8) ◽

pp. 1330-1332 ◽

Cited By ~ 14

Author(s):

James H. Clark ◽

Catherine V. A. Duke

Keyword(s):

Surface Area ◽

High Surface ◽

High Surface Area ◽

Potassium Cyanide ◽

Support Materials ◽

Inorganic Support

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Bifunctional Materials for CO₂ Adsorption: Short Review

Journal of Chemical Engineering and Industrial Biotechnology ◽

10.15282/jceib.v7i2.7021 ◽

2021 ◽

Vol 7 (2) ◽

pp. 15-19

Author(s):

S. M. Yusof ◽

L. P. Teh

Keyword(s):

Surface Area ◽

Active Sites ◽

Co2 Adsorption ◽

High Surface ◽

Co Adsorption ◽

High Surface Area ◽

Short Review ◽

High Dispersion ◽

High Porosity ◽

Adsorption Performance

In recent years, there has been growing interest in adsorbents with high surface area, high porosity, high stability and high selectivity for CO2 adsorption. By the incorporation of the additive on the supports such as zeolite, silica, and carbon, the physicochemical properties of the adsorbent and CO2 adsorption performance can be enhanced. In this review, we focus on the overview of bifunctional materials (BFMs) for CO2 adsorption. The findings of this study suggests that the high surface area and high porosity of the support provide a good medium for high dispersion and accessibility of additives (amine or metal oxide), enhancing the CO2 adsorption efficiency. The excessive additive however may lead to a decrease of CO2 adsorption performance due to pore blockage and the decrease of active sites for CO2 interactions. The synergistic relationship of the supporting material and additive is significant towards the enhancement of CO2 adsorption.

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Self-Nitrogen-Doped Nanoporous Carbons Derived from Poly(1,5-diaminonaphthalene) for the Removal of Toxic Dye Pollutants from Wastewater: Non-Linear Isotherm and Kinetic Analysis

Polymers ◽

10.3390/polym12112563 ◽

2020 ◽

Vol 12 (11) ◽

pp. 2563

Author(s):

Ali Aldalbahi ◽

Badr M. Thamer ◽

Mostafizur Rahaman ◽

Mohamed H. El-Newehy

Keyword(s):

Surface Area ◽

High Efficiency ◽

High Surface ◽

High Surface Area ◽

Freundlich Isotherm ◽

Vital Role ◽

Isotherm Models ◽

Order Kinetic ◽

Nanoporous Carbons ◽

Nitrogen Doped

The high surface area and porosity of self-nitrogen-doped porous carbons (SNPCs) nominates them for potential application in water treatment due to their high efficiency towards the removal of various pollutants. In this study, SNPCs were fabricated from poly(1,5-diaminonaphthalene) (P(1,5-DANPh) by single and simultaneous carbonization at the activation step at different temperatures (600, 700, and 800 °C). The carbonization’s temperature plays a vital role in controlling the nitrogen-doping, surface area, porosity, and morphology of SNPCs. The SNPCs-7 sample prepared at 700 °C showed the highest surface area (1678.8 m2 g−1) with pore volume (0.943 cm3 g−1) with a micro/meso porous structure. The prepared SNPCs were used as an effective adsorbent for removal of crystal violet dye (CV) from contaminated water. SNPCs-7 showed the highest adsorption of 487.53 mg g−1 and the adsorption capacity of the SNPCs samples follows the order SNPCs-7 > SNPCs-8 > SNPCs-6, which is consistent with the results of their surface area and porosity. The adsorption for CV dye followed Freundlich isotherm models and a pseudo second order kinetic model. The negative values of Gipps free energy (ΔG°) and positive value of enthalpy (ΔH°) indicated that the adsorption of CV dye onto the surface of SNPCs was a spontaneous and endothermic process, respectively. Based on the results, the adsorption mechanism of CV dye onto the surface of SNPCs was proposed.

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A porous Brønsted superacid as an efficient and durable solid catalyst

Journal of Materials Chemistry A ◽

10.1039/c8ta06516k ◽

2018 ◽

Vol 6 (38) ◽

pp. 18712-18719 ◽

Cited By ~ 10

Author(s):

Qi Sun ◽

Kewei Hu ◽

Kunyue Leng ◽

Xianfeng Yi ◽

Briana Aguila ◽

...

Keyword(s):

Surface Area ◽

Active Sites ◽

High Surface ◽

High Surface Area ◽

Solid Catalyst ◽

Chemical Transformations ◽

Catalytic Activities ◽

Industrial Chemical

A porous superacid material with a high surface area and abundant accessible active sites is rationally designed, showing outstanding catalytic activities and durability in industrial chemical transformations.

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Synthesis and characterization of a novel CNT-FeNi3/DFNS/Cu(ii) magnetic nanocomposite for the photocatalytic degradation of tetracycline in wastewater

RSC Advances ◽

10.1039/c9ra05817f ◽

2019 ◽

Vol 9 (60) ◽

pp. 35022-35032 ◽

Cited By ~ 5

Author(s):

Yanhua Zhao ◽

Jie Juan Tang ◽

Alireza Motavalizadehkakhky ◽

Saeid Kakooei ◽

Seyed Mohsen Sadeghzadeh

Keyword(s):

Photocatalytic Degradation ◽

Surface Area ◽

Active Sites ◽

High Surface ◽

High Surface Area ◽

Magnetic Nanocomposite ◽

Synthesis And Characterization

Herein, Cu(ii) complexes were anchored within the nanospaces of a magnetic fibrous silicate with a high surface area and easily accessible active sites via a facile approach, leading to the successful synthesis of a novel potent nanocatalyst (FeNi3/DFNS/Cu).

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