New Modeling of AgFeNi2S4-Graphene-TiO2 Ternary Nanocomposite with Chelate Compounds and Its Photocatalytic Reduction of CO2

Mapping Intimacies ◽

10.21203/rs.3.rs-173213/v1 ◽

2021 ◽

Author(s):

Zambaga Otgonbayar ◽

Chong Hun Jung ◽

Oh Won-Chun

Keyword(s):

Catalytic Activity ◽

Citric Acid ◽

Solvothermal Method ◽

High Catalytic Activity ◽

Photogenerated Electrons ◽

Methanol Formation ◽

Nano Material ◽

Chelate Compounds ◽

The Stability ◽

Reduction Of Co2

Abstract Herein, we synthesized the chalcogenide-quaternary nanocomposite loaded Graphene-based ternary photocatalyst via a modified solvothermal method. The preparation of quaternary nanocomposite was based on metallic citrate polymerization which used ethylene glycol (C2H6O2) and citric acid (C6H8O7) as chelate cations. The morphology and electrochemical properties of the as-prepared nano-material investigated by using a physical characterization equipment. Each result showed that the ternary photocatalyst was successfully synthesized and showed the low recombination rate of photogenerated electrons and holes, which defined the catalytic activity of the photocatalyst for CO2 evolution into hydrocarbon fuels under light irradiation. In addition, the stability and reusability of the photocatalyst were analyzed by a 6-times cycling test without loss of methanol formation by CO2 evolution. The graphene-based ternary photocatalyst offers a new nanomaterial with a new-model that protects the environment by showing high catalytic activity in reducing CO2 to methanol.

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New gold standard: weakly capped infant Au nanoclusters with record high catalytic activity for 4-nitrophenol reduction and hydrogen generation from an ammonia borane–sodium borohydride mixture

Nanoscale Advances ◽

10.1039/d0na00639d ◽

2020 ◽

Vol 2 (11) ◽

pp. 5384-5395

Author(s):

Dinabandhu Patra ◽

Srinivasa Rao Nalluri ◽

Hui Ru Tan ◽

Mohammad S. M. Saifullah ◽

Ramakrishnan Ganesan ◽

...

Keyword(s):

Catalytic Activity ◽

Citric Acid ◽

Solid State ◽

Gold Standard ◽

Active Sites ◽

Hydrogen Generation ◽

High Catalytic Activity ◽

Au Nanoclusters ◽

Nitrophenol Reduction ◽

Rapid Dissolution

Active sites are preserved in the citric acid-capped Au nanoclusters prepared in solid state. In water, the rapid dissolution of citric acid allows the reactants to easily access the active sites of infant Au nanoclusters leading to faster catalysis.

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Novel Combination of Quaternary AgFeNi2S4 Semiconductor In Graphene-TiO2 Nanocomposite For The Enhanced Electrophotocatalytic Reduction of CO2

10.21203/rs.3.rs-662225/v1 ◽

2021 ◽

Author(s):

Zambaga Otgonbayar ◽

Won Chun Oh

Keyword(s):

Catalytic Activity ◽

Preparation Method ◽

Uv Light ◽

Pechini Method ◽

Hydrocarbon Fuels ◽

Working Electrode ◽

The Stability ◽

Reduction Of Co2 ◽

Positive Effect ◽

Morphological State

Abstract For reduction of CO2 into hydrocarbon fuels, a quaternary AgFeNi2S4 semiconductor combined in Graphene-TiO2 nanocomposite material was synthesized via the Pechini method. The catalytic activity of the photocatalyst for photocatalytic and electrochemical CO2 evolution into hydrocarbon fuels was tested. The methanol yield under UV light was 8.679, 6.349, and 4.136 %, and the methanol yields under visible light were 6.291, 4.738, and 2.339 %, respectively. The stability and reusability of the photocatalyst remained high after a 4-cycle recycling test without a decrease in yield of the final photocatalytic CO2 reduction product. The enhanced photoreduction of CO2 through the as-prepared ternary photocatalyst can be ascribed to the catalyst's conformation and low recombination rate. In electrochemical CO2 reduction, the Faraday efficiency is the main parameter that defines the performance of the working electrode and the evolution of methanol. The Faraday efficiency of AFNSGT ternary nanocomposite was 44.25 %; this is an increase in the value of the Faraday efficiency, which proves that the design of the new nanocomposite successfully increases the activity of the working electrode and has a positive effect on the electrochemical reduction of CO2. The photocatalytic and electrochemical CO2 reduction data show that the preparation method, morphological state, and charge carrier properties of the photocatalyst are important for the catalytic activity and efficiency of the methanol evolution pathway.

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Synergistic Effects of Co3O4-CeO2 Nanoparticles towards Catalytic Oxidation of Aromatic Hydrocarbons: A Study in Association with Carbon Monoxide and Humidity

Journal of Nanomaterials ◽

10.1155/2021/5542281 ◽

2021 ◽

Vol 2021 ◽

pp. 1-9

Author(s):

Trung Dang-Bao ◽

Hong Phuong Phan ◽

Phung Anh Nguyen ◽

Pham Phuong Trang Vo ◽

Van Tien Huynh ◽

...

Keyword(s):

Carbon Monoxide ◽

Catalytic Activity ◽

Catalytic Oxidation ◽

Synergistic Effects ◽

Active Oxygen Species ◽

High Dispersion ◽

High Catalytic Activity ◽

Impregnation Method ◽

Temperature Programmed ◽

The Stability

In this study, a series of Co3O4-CeO2 nanocomposites with various Co3O4 loading were fabricated by the impregnation method using cobalt(II) acetate as the cobalt precursor for the treatment of benzene, toluene, ethylbenzene, and xylene (BTEX). The as-prepared Co3O4-CeO2 nanocomposites were thoroughly characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), Brumauer-Emmett-Teller (BET), hydrogen temperature-programmed reduction (H2-TPR), and temperature-programmed desorption (O2-TPD). The excellent reproduction of active oxygen species caused by the high dispersion of Co3O4 crystals on the CeO2 supports was established. In addition, the reduction peaks of Co3O4-CeO2 nanocomposites were found at much lower temperatures compared to pure CeO2, considering their unique redox property influencing on the high catalytic activity. Among the characterized materials, the 5.0 wt.% Co3O4 supported on CeO2 (5.0Co–Ce) was the best system for catalytic oxidation of xylene, along with excellent performances in the cases of benzene, ethylbenzene, and toluene. Its catalytic activity increased in the order: benzene < xylene < ethylbenzene < toluene . Furthermore, the addition of carbon monoxide (CO) as a coreactant permitted to improve the catalytic performances in such oxidations as well as the stability of as-prepared catalysts, even under humid conditions.

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Study on Bio-Fuels Drop Acid by [BSPy]HSO4 Catalytic Esterification

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.781-784.2433 ◽

2013 ◽

Vol 781-784 ◽

pp. 2433-2437 ◽

Cited By ~ 1

Author(s):

Ai Hua Zhang ◽

Zhi Hong Xiao ◽

Liang Bo Zhang ◽

Ru Kuan Liu ◽

Wu Hong Zhong ◽

...

Keyword(s):

Catalytic Activity ◽

Reaction Time ◽

Reaction Temperature ◽

Acid Value ◽

Esterification Reaction ◽

Process Conditions ◽

High Catalytic Activity ◽

Brønsted Acidic Ionic Liquid ◽

The Stability ◽

Acid Esterification

Research on the synthesis of BrOnsted acidic ionic liquid by the method of solvent, the pyrolysis bio-fuel with cornus wisoniana oil drop acid esterification reaction, the catalyst dosage, reaction time and reaction temperature on the effects of the acid dropping and in the best optimization under the condition of the stability of the catalyst were investigated. The experimental results show that [BSPHSO4 with high catalytic activity, optimization of process conditions as follows: 1.2% of catalyst, reaction temperature 75 °C, reaction time of 70 min, acid value reduced to 2.0 mg KOH/g. By optimizing the cycle experiment, the stability of the catalyst performance is good, the catalytic activity is relatively stable.

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Preparation of High Catalytic Activity SnO2 nanoflower for Electrochemical Reduction of CO2

ECS Meeting Abstracts ◽

10.1149/ma2014-03/3/357 ◽

2014 ◽

Keyword(s):

Catalytic Activity ◽

Electrochemical Reduction ◽

High Catalytic Activity ◽

Reduction Of Co2

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Size-controlled PdO/graphene oxides and their reduction products with high catalytic activity

RSC Advances ◽

10.1039/c4ra02855d ◽

2014 ◽

Vol 4 (56) ◽

pp. 29563-29570 ◽

Cited By ~ 25

Author(s):

Jingjing Lin ◽

Tao Mei ◽

Meijiao Lv ◽

Chang'an Zhang ◽

Zhenfeng Zhao ◽

...

Keyword(s):

Catalytic Activity ◽

Hydrazine Hydrate ◽

Electrocatalytic Activity ◽

Suzuki Reaction ◽

High Catalytic Activity ◽

Graphene Oxides ◽

Highly Active ◽

The Stability ◽

Size Controlled ◽

Better Than

Well-dispersed and size-controlled Pd/RGO with highly active catalysts was synthesized through reduction of PdO/GO with hydrazine hydrate and ammonia. The electrocatalytic activity and the stability of the as-prepared Pd/RGO are much better than those of commercial Pd/C catalysts for methanol electrooxidation and the Suzuki reaction.

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New Modeling of AgFeNi2S4-Graphene-TiO2 Ternary Nanocomposite Synthesized Via the Pechini Method for the Enhanced Electrophotocatalytic Reduction of CO2

10.21203/rs.3.rs-612368/v1 ◽

2021 ◽

Author(s):

Zambaga Otgonbayar ◽

Won-Chun Oh

Keyword(s):

Catalytic Activity ◽

Uv Light ◽

Pechini Method ◽

Chelating Agent ◽

Hydrocarbon Fuels ◽

Ternary Nanocomposite ◽

Working Electrode ◽

The Stability ◽

Reduction Of Co2 ◽

Positive Effect

Abstract For reduction of CO2 into hydrocarbon fuels, an AgFeNi2S4-Graphene-TiO2 ternary nanocomposite material was synthesized via the Pechini method. The Pechini method is based on a chelating agent which, together with ethylene glycol (C2H6O2) and citric acid (C6H8O7) as a chelating cation, can affect the structure and stability of the nanocomposite. The catalytic activity of the photocatalyst for photocatalytic and electrochemical CO2 evolution into hydrocarbon fuels was tested. The methanol yield under UV light was 8.679 %, 6.349 %, and 4.136 %, and the methanol yields under visible light was 6.291 %, 4.738 %, and 2.339 %, respectively. The stability and reusability of the photocatalyst remained high after a 4-cycle recycling test without a decrease in yield of the final photocatalytic CO2 reduction product. The enhanced photoreduction of CO2 through the as-prepared ternary photocatalyst can be ascribed to the catalyst's conformation and low recombination rate. In electrochemical CO2 reduction, the Faraday efficiency is the main parameter that defines the performance of the working electrode and the evolution of methanol. The Faraday efficiency of AFNSGT ternary nanocomposite was 44.25 %; this is an increase in the value of the Faraday efficiency, which proves that the design of the new nanocomposite successfully increases the activity of the working electrode and has a positive effect on the electrochemical reduction of CO2. The photocatalytic and electrochemical CO2 reduction data show that the preparation method, morphological state, and charge carrier properties of the photocatalyst are important for the catalytic activity and efficiency of the methanol evolution pathway. This study provides a strategy for fabrication of a new ternary nanocomposite based on 2D-structured graphene, TiO2, and a quaternary nanocomposite.

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Template Synthesis and Electrocatalytic Properties of Palladium Hollow Spheres

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.709.11 ◽

2013 ◽

Vol 709 ◽

pp. 11-14

Author(s):

Hai Long Lu ◽

Wan Neng Ye ◽

Pei Zhi Guo ◽

Qin Chao Wang ◽

Chao Jing Lu ◽

...

Keyword(s):

Catalytic Activity ◽

Room Temperature ◽

Solvothermal Method ◽

Hollow Spheres ◽

Cobalt Nanoparticles ◽

Saed Pattern ◽

High Catalytic Activity ◽

Structure Property ◽

Structure Property Relationship ◽

Relationship Of

Palladium hollow spheres were synthesized at room temperature using cobalt nanoparticles (NPs) as sacrificing templates. Cobalt NPs can be prepared simply by solvothermal method. The hollow nature of sample Pd were observed from the TEM image and the SAED pattern indicates the polycrystalline nature of the sample. It was found that Pd hollow spheres showed high catalytic activity towards the electrooxidation of alcohols, especially ethanol with the current density up to 2047 mA•mg-1. The formation mechanism and the structure-property relationship of Pd hollow spheres were discussed based on the experimental results.

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Optimization of Process Variables in the Synthesis of Tributyl Citrate Using a Polyvinylpolypyrrolidone-Supported Brønsted Acidic Ionic Liquid Catalyst

International Journal of Polymer Science ◽

10.1155/2018/1953563 ◽

2018 ◽

Vol 2018 ◽

pp. 1-9

Author(s):

Song Wang ◽

Lanlan Xu ◽

Linlin Xu ◽

Chengcheng Tian ◽

Yinyan Guan

Keyword(s):

Ionic Liquid ◽

Catalytic Activity ◽

Citric Acid ◽

Reaction Temperature ◽

Esterification Reaction ◽

High Catalytic Activity ◽

Process Variables ◽

Acidic Ionic Liquid ◽

Brønsted Acidic Ionic Liquid ◽

Optimized Conditions

A polyvinylpolypyrrolidone- (PVPP-) supported Brønsted acidic ionic liquid catalyst ([BsPVPP]HSO4) was synthesized by the reaction between SO3H-functionalized PVPP and H2SO4. The prepared catalyst was characterized by IR, XRD, FESEM, TG, and DSC. The catalytic activity of [BsPVPP]HSO4 in the preparation of tributyl citrate (TBC) by the esterification reaction between citric acid and n-butanol was investigated. Response surface methodology (RSM) was applied to optimize the process variables of the esterification reaction. The variables, including the reaction time, the n-butanol-to-citric acid mole ratio, the reaction temperature, and the catalyst amount, were optimized by a Box-Behnken design. Under optimized conditions, with a n-butanol-to-citric acid mole ratio of 5.2 : 1 and a reaction temperature of 120°C, the TBC yield reached 92.9% within 5.5 h in the presence of 6.6 wt% of catalyst; this result is in good agreement with the values predicted by the mathematical model. Moreover, the catalyst could be recycled four times with high catalytic activity.

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