Catalysts

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2 pages, 1018 KiB

Open AccessEditorial

Catalysis and Fine Chemicals

by Kotohiro Nomura and Boonyarach Kitiyanan

Catalysts 2020, 10(5), 516; https://doi.org/10.3390/catal10050516 - 7 May 2020

Cited by 1 | Viewed by 2183

Abstract

At the event of the International Symposium on Catalysis and Fine Chemicals 2018 (C&FC2018, 10–14 December 2018, Chulalongkorn University, Bangkok, Thailand) organized by PETROMAT (co-organized by Chemical Society of Thailand and CATSJ), we decided to organize a Special Issue entitled “Catalysis and Fine [...] Read more.

At the event of the International Symposium on Catalysis and Fine Chemicals 2018 (C&FC2018, 10–14 December 2018, Chulalongkorn University, Bangkok, Thailand) organized by PETROMAT (co-organized by Chemical Society of Thailand and CATSJ), we decided to organize a Special Issue entitled “Catalysis and Fine Chemicals” [...] Full article

(This article belongs to the Special Issue Catalysis and Fine Chemicals)

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Research

Jump to: Editorial

11 pages, 3360 KiB

Open AccessArticle

Enhancement of Photoelectrochemical Cathodic Protection of Copper in Marine Condition by Cu-Doped TiO₂

by Pailin Ngaotrakanwiwat, Piyapol Heawphet and Pramoch Rangsunvigit

Catalysts 2020, 10(2), 146; https://doi.org/10.3390/catal10020146 - 22 Jan 2020

Cited by 8 | Viewed by 3068

Abstract

Photochemical cathodic protection (PEC) efficiency was enhanced by doping TiO₂ with Cu (Cu/TiO₂) through impregnation and reduction under hydrogen. The Cu loading was vaired from 0.1 to 1.0 mol% (0.1 Cu/TiO₂, 0.5 Cu/TiO₂, 1 Cu/TiO₂ [...] Read more.

Photochemical cathodic protection (PEC) efficiency was enhanced by doping TiO₂ with Cu (Cu/TiO₂) through impregnation and reduction under hydrogen. The Cu loading was vaired from 0.1 to 1.0 mol% (0.1 Cu/TiO₂, 0.5 Cu/TiO₂, 1 Cu/TiO₂). Then, up to 50 wt% Cu/TiO₂ was mixed with TiO₂ to form nanocomposite films. The film photocurrent and photopotential were measured under 1 mW/cm² UV irradiation. The Cu/TiO₂ film with 10 wt% of 0.5 Cu/TiO₂ exhibited the highest photocurrent of 29.0 mA/g, which was three times higher than the TiO₂ film. The underlying reason for the high photocurrent was the lower photopotential of film than the corrosion potential of copper for PEC. This film was also applied on copper terminal lug for anti-corrosion measurement by Tafel polarization in 3.5 wt% NaCl solution. The results showed that the photopotential of terminal lug coated with the film was −0.252 V vs. Ag/AgCl, which was lower than the corrosion potential of copper (−0.222 V vs. Ag/AgCl). Furthermore, the film can protect the corrosion of copper in the dark with 86.7% lower corrosion current (i_corr) than that of bare copper. Full article

(This article belongs to the Special Issue Catalysis and Fine Chemicals)

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10 pages, 1701 KiB

Open AccessArticle

Low Temperature Methanation of CO₂ on High Ni Content Ni-Ce-ZrO_δ Catalysts Prepared via One-Pot Hydrothermal Synthesis

by Vissanu Meeyoo, Noppadol Panchan, Nat Phongprueksathat, Atsadang Traitangwong, Xinpeng Guo, Chunshan Li and Thirasak Rirksomboon

Catalysts 2020, 10(1), 32; https://doi.org/10.3390/catal10010032 - 26 Dec 2019

Cited by 13 | Viewed by 5445

Abstract

Ni-Ce-Zr-O_δ catalysts were prepared via one-pot hydrothermal synthesis. It was found that Ni can be partially incorporated into the Ce-Zr lattice, increasing surface oxygen species. The catalysts possess high surface areas even at high Ni loadings. The catalyst with Ni content of [...] Read more.

Ni-Ce-Zr-O_δ catalysts were prepared via one-pot hydrothermal synthesis. It was found that Ni can be partially incorporated into the Ce-Zr lattice, increasing surface oxygen species. The catalysts possess high surface areas even at high Ni loadings. The catalyst with Ni content of 71.5 wt.% is able to activate CO₂ methanation even at a low temperature (200 °C). Its CO₂ conversion and methane selectivity were reported at 80% and 100%, respectively. The catalyst was stable for 48 h during the course of CO₂ methanation at 300 °C. Catalysts with the addition of medium basic sites were found to have better catalytic activity for CO₂ methanation. Full article

(This article belongs to the Special Issue Catalysis and Fine Chemicals)

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16 pages, 6639 KiB

Open AccessArticle

Facile Synthesis of High Performance Iron Oxide/Carbon Nanocatalysts Derived from the Calcination of Ferrocenium for the Decomposition of Methylene Blue

by Thinnaphat Poonsawat, Thanyaphat Techalertmanee, Peerapong Chumkaeo, Isti Yunita, Titiya Meechai, Montree Namkajorn, Soraya Pornsuwan and Ekasith Somsook

Catalysts 2019, 9(11), 948; https://doi.org/10.3390/catal9110948 - 12 Nov 2019

Cited by 4 | Viewed by 3794

Abstract

Iron oxide/carbon nanocatalysts were successfully synthesized by the calcination of ferrocenium at high temperatures ranging from 500 to 900 °C. Then the synthesized nanocomposites were characterized by XRD (X-Ray Diffraction), TEM (Transmission Electron Microscopy), VSM (Vibrating-Sample Magnetometry), BET (Brunauer-Emmett-Teller surface area measurements), TGA [...] Read more.

Iron oxide/carbon nanocatalysts were successfully synthesized by the calcination of ferrocenium at high temperatures ranging from 500 to 900 °C. Then the synthesized nanocomposites were characterized by XRD (X-Ray Diffraction), TEM (Transmission Electron Microscopy), VSM (Vibrating-Sample Magnetometry), BET (Brunauer-Emmett-Teller surface area measurements), TGA (Thermogravimetric Analysis), XPS (X-Ray Photoelectron Spectroscopy), EPR (Electron Paramagnetic Resonance), and CHN elemental analysis. The prepared nanocatalysts were applied for the decomposition of methylene blue as a model in wastewater treatment. It was unexpected to discover that the prepared nanocatalysts were highly active for the reaction with methylene blue in the dark even though no excess of hydrogen peroxide was added. The nanocatalyst calcined at 800 °C exhibited the rod shape with the best catalytic activity. The nanocatalysts could be reused for 12 times without the significant loss of the catalytic activity. Full article

(This article belongs to the Special Issue Catalysis and Fine Chemicals)

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12 pages, 3292 KiB

Open AccessArticle

Kinetic Monte-Carlo Simulation of Methane Steam Reforming over a Nickel Surface

by Palawat Unruean, Teetuch Plianwong, Sirawit Pruksawan, Boonyarach Kitiyanan and Robert M. Ziff

Catalysts 2019, 9(11), 946; https://doi.org/10.3390/catal9110946 - 11 Nov 2019

Cited by 3 | Viewed by 3995

Abstract

A kinetic Monte-Carlo model was developed in order to simulate the methane steam reforming and kinetic behavior of this reaction. There were 34 elementary step reactions that were used, based on the Langmuir–Hinshelwood mechanism, over a nickel catalyst. The simulation was investigated at [...] Read more.

A kinetic Monte-Carlo model was developed in order to simulate the methane steam reforming and kinetic behavior of this reaction. There were 34 elementary step reactions that were used, based on the Langmuir–Hinshelwood mechanism, over a nickel catalyst. The simulation was investigated at a mole fraction of methane between 0.1 and 0.9, temperature of 600 to 1123 K, and total pressure of up to 40 bar. The simulated results were collected at a steady state and were compared with the previously reported experiments. The fractional coverages of the adsorbed species and the production rates of H₂, CO, and CO₂ were evaluated, and the effects of the reaction temperature, feed concentration, and total pressure of reactants were also investigated. The simulation results showed a similar trend with previous experimental results, and suggested the appropriate conditions for this reaction, which were a total pressure of 10 bar, with the mole fraction of methane in a range of 0.4–0.5. Full article

(This article belongs to the Special Issue Catalysis and Fine Chemicals)

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12 pages, 1785 KiB

Open AccessArticle

PPh₃-Assisted Esterification of Acyl Fluorides with Ethers via C(sp³)–O Bond Cleavage Accelerated by TBAT

by Zhenhua Wang, Xiu Wang and Yasushi Nishihara

Catalysts 2019, 9(7), 574; https://doi.org/10.3390/catal9070574 - 28 Jun 2019

Cited by 11 | Viewed by 6450

Abstract

We describe the (triphenylphosphine (PPh₃)-assisted methoxylation of acyl fluorides with cyclopentyl methyl ether (CPME) accelerated by tetrabutylammonium difluorotriphenysilicate (TBAT) via regiospecific C–OMe bond cleavage. Easily available CPME is utilized not only as the solvent, but a methoxylating agent in this transformation. [...] Read more.

We describe the (triphenylphosphine (PPh₃)-assisted methoxylation of acyl fluorides with cyclopentyl methyl ether (CPME) accelerated by tetrabutylammonium difluorotriphenysilicate (TBAT) via regiospecific C–OMe bond cleavage. Easily available CPME is utilized not only as the solvent, but a methoxylating agent in this transformation. The present method is featured by C–O and C–F bond cleavage under metal-free conditions, good functional-group tolerance, and wide substrate scope. Mechanistic studies revealed that the radical process was not involved. Full article

(This article belongs to the Special Issue Catalysis and Fine Chemicals)

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13 pages, 12518 KiB

Open AccessArticle

Iridium-Catalyzed Transfer Hydrogenation of Ketones and Aldehydes Using Glucose as a Sustainable Hydrogen Donor

by Masato Yoshida, Ryota Hirahata, Takayoshi Inoue, Takuya Shimbayashi and Ken-ichi Fujita

Catalysts 2019, 9(6), 503; https://doi.org/10.3390/catal9060503 - 31 May 2019

Cited by 23 | Viewed by 6696

Abstract

A new catalytic system for transfer hydrogenation of carbonyl compounds using glucose as a hydrogen donor was developed. Various ketones and aldehydes were efficiently converted to corresponding alcohols with two equivalents of glucose in the presence of a small amount (0.1 to 1.0 [...] Read more.

A new catalytic system for transfer hydrogenation of carbonyl compounds using glucose as a hydrogen donor was developed. Various ketones and aldehydes were efficiently converted to corresponding alcohols with two equivalents of glucose in the presence of a small amount (0.1 to 1.0 mol%) of iridium catalyst that had a functional ligand. In this catalytic system, transfer hydrogenation reactions proceeded based on the cooperativity of iridium and a functional ligand. It should be noted that environmentally benign water could have been used as a solvent in the present catalytic system for the reduction of various carbonyl substrates. Furthermore, the reaction scope could be extended by using N,N-dimethylacetamide as a reaction solvent. Full article

(This article belongs to the Special Issue Catalysis and Fine Chemicals)

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18 pages, 3665 KiB

Open AccessArticle

Tuning Selectivity of Maleic Anhydride Hydrogenation Reaction over Ni/Sc-Doped ZrO₂ Catalysts

by Lili Zhao, Yin Zhang, Tianjie Wu, Min Zhao, Yongzhao Wang, Jianghong Zhao, Tiancun Xiao and Yongxiang Zhao

Catalysts 2019, 9(4), 366; https://doi.org/10.3390/catal9040366 - 18 Apr 2019

Cited by 10 | Viewed by 4029

Abstract

A series of Sc-doped ZrO₂ supports, with Sc₂O₃ content in the range of 0 to 7.5% (mol/mol), were prepared using the hydrothermal method. Ni/Sc-doped ZrO₂ catalysts with nickel loading of 10% (w/w) were prepared [...] Read more.

A series of Sc-doped ZrO₂ supports, with Sc₂O₃ content in the range of 0 to 7.5% (mol/mol), were prepared using the hydrothermal method. Ni/Sc-doped ZrO₂ catalysts with nickel loading of 10% (w/w) were prepared using impregnation method, and characterized with the use of XRD, Raman, H₂ temperature-programmed reduction (H₂-TPR), H₂ temperature-programmed desorption (H₂-TPD), XPS, and in situ FT-IR techniques. The catalytic performances of Ni/Sc-doped ZrO₂ catalysts in maleic anhydride hydrogenation were tested. The results showed that the introduction of Sc³⁺ into ZrO₂ support could effectively manipulate the distribution of maleic anhydride hydrogenation products. γ-butyrolactone was the major hydrogenation product over Sc-free Ni/ZrO₂ catalyst with selectivity as high as 65.8% at 210 °C and 5 MPa of H₂ pressure. The Ni/Sc-doped ZrO₂ catalyst, with 7.5 mol% of Sc₂O₃ content, selectively catalyzed maleic anhydride hydrogenation to succinic anhydride, the selectivity towards succinic anhydride was up to 97.6% under the same reaction condition. The results of the catalysts’ structure–activity relationships revealed that there was an interdependence between the surface structure of ZrO₂-based support and the C=O hydrogenation performance of the ZrO₂-based supported nickel catalysts. By controlling the Sc₂O₃ content, the surface structure of ZrO₂-based support could be regulated effectively. The different surface structure of ZrO₂-based supports, resulted in the different degree of interaction between the nickel species and ZrO₂-based supports; furthermore, the different interaction led to the different surface oxygen vacancies electron properties of ZrO₂-based supported nickel catalysts and the C=O hydrogenation activity of the catalyst. This result provides new insight into the effect of ZrO₂ support on the selective hydrogenation activity of ZrO₂-supported metal catalysts and contributes to the design of selective hydrogenation catalysts for other unsaturated carbonyl compounds. Full article

(This article belongs to the Special Issue Catalysis and Fine Chemicals)

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