High Catalytic Activity of Ion-Exchanged Nickel on Carboxymethylated Wood Char in Methanation of Carbon Monoxide

1995 ◽  
Vol 24 (8) ◽  
pp. 699-700 ◽  
Author(s):  
Tsutomu Suzuki ◽  
Yuzo Imizu ◽  
Yoshinobu Satoh ◽  
Sunao Ozaki
Keyword(s):  
Carbon Monoxide ◽  
Catalytic Activity ◽  
High Catalytic Activity ◽  
Wood Char

scholarly journals CO Oxidation Efficiency and Hysteresis Behavior over Mesoporous Pd/SiO2 Catalyst

Catalysts ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 131 ◽  
Author(s):  
Rola Mohammad Al Soubaihi ◽  
Khaled Mohammad Saoud ◽  
Myo Tay Zar Myint ◽  
Mats A. Göthelid ◽  
Joydeep Dutta
Keyword(s):  
Carbon Monoxide ◽  
Catalytic Activity ◽  
Co Oxidation ◽  
Active Sites ◽  
Bond Activation ◽  
Dissociative Adsorption ◽  
High Catalytic Activity ◽  
Good Catalytic Activity ◽  
Pretreatment Conditions ◽  
Oxidation Efficiency

Carbon monoxide (CO) oxidation is considered an important reaction in heterogeneous industrial catalysis and has been extensively studied. Pd supported on SiO2 aerogel catalysts exhibit good catalytic activity toward this reaction owing to their CO bond activation capability and thermal stability. Pd/SiO2 catalysts were investigated using carbon monoxide (CO) oxidation as a model reaction. The catalyst becomes active, and the conversion increases after the temperature reaches the ignition temperature (Tig). A normal hysteresis in carbon monoxide (CO) oxidation has been observed, where the catalysts continue to exhibit high catalytic activity (CO conversion remains at 100%) during the extinction even at temperatures lower than Tig. The catalyst was characterized using BET, TEM, XPS, TGA-DSC, and FTIR. In this work, the influence of pretreatment conditions and stability of the active sites on the catalytic activity and hysteresis is presented. The CO oxidation on the Pd/SiO2 catalyst has been attributed to the dissociative adsorption of molecular oxygen and the activation of the C-O bond, followed by diffusion of adsorbates at Tig to form CO2. Whereas, the hysteresis has been explained by the enhanced stability of the active site caused by thermal effects, pretreatment conditions, Pd-SiO2 support interaction, and PdO formation and decomposition.

Ruthenium- and Rhodium-Catalyzed Ring-Opening Coupling Reactions of Cyclopropenones with Alkenes or Alkynes

Synlett ◽  
2018 ◽  
Vol 29 (06) ◽  
pp. 717-722 ◽  
Author(s):  
Teruyuki Kondo ◽  
Ryosuke Taniguchi ◽  
Yu Kimura
Keyword(s):  
Carbon Monoxide ◽  
Catalytic Activity ◽  
Methyl Acrylate ◽  
Ring Opening ◽  
Argon Atmosphere ◽  
High Catalytic Activity ◽  
Rhodium Complexes ◽  
Coupling Reactions ◽  
Internal Alkynes ◽  
High Yields

Ru3(CO)12-catalyzed divergent ring-opening coupling reactions of a cyclopropenone with methyl acrylate (an electron-deficient alkene) are developed. Under an argon atmosphere, a decarbonylative linear codimer is obtained, while cyclopentenones are obtained under carbon monoxide (20 atm) without decarbonylation. While ruthenium complexes show no catalytic activity for the ring-opening cocyclization of cyclopropenones with ethylene (20 atm) or bicyclo[2.2.1]hept-2-ene (2-norbornene), rhodium complexes, especially [RhCl(η4-1,5-cod)]2, show high catalytic activity for the desired cocyclization reactions to give the corresponding cyclopentenones in high yields and selectivities. In addition, [RhCl(η4-1,5-cod)]2 realizes the catalytic ring-opening co­cyclization of cyclopropenones with internal alkynes to give the corresponding cyclopentadienones. In all these reactions, ruthena- or rhodacyclobutenones are considered to be key intermediates, generated by strain-driven oxidative addition of a cyclopropenone C–C bond to an ­active ruthenium or rhodium species.

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

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.

scholarly journals γ-Alumina-supported Pt17 cluster: controlled loading, geometrical structure, and size-specific catalytic activity for carbon monoxide and propylene oxidation

2020 ◽  
Vol 2 (2) ◽  
pp. 669-678 ◽  
Author(s):  
Yuichi Negishi ◽  
Nobuyuki Shimizu ◽  
Kanako Funai ◽  
Ryo Kaneko ◽  
Kosuke Wakamatsu ◽  
...  
Keyword(s):  
Carbon Monoxide ◽  
Catalytic Activity ◽  
Geometrical Structure ◽  
High Catalytic Activity ◽  
Propylene Oxidation ◽  
Specific Catalytic Activity

A Pt17 cluster was precisely loaded on γ-alumina and the resulting Pt17/γ-Al2O3 exhibited high catalytic activity for CO and C3H6 oxidation.

scholarly journals INFLUENCE OF CALCIUM AND COPPER FERRITES ON ACTIVITY AND SELECTIVITY OF MEDIUM-TEMPERATURE CO CONVERSION CATALYSTS

2018 ◽  
Vol 59 (3) ◽  
pp. 43
Author(s):  
Maksim А. Lapshin ◽  
Ruslan R. Rumyantsev ◽  
Grigoriy S. Nikitin ◽  
Segrej P. Kochetkov ◽  
Mikhail V. Kleshchev
Keyword(s):  
Gas Chromatography ◽  
Carbon Monoxide ◽  
Catalytic Activity ◽  
Ir Spectroscopy ◽  
Xrd Analysis ◽  
High Catalytic Activity ◽  
Medium Temperature ◽  
X Ray ◽  
Co Conversion ◽  
Concentration Of Impurities

Process of mechanochemical synthesis of calcium and copper ferrites was studied by X-ray and XRD analysis, thermogravimetry, IR spectroscopy and gas chromatography methods. Their high catalytic activity in reaction of carbon monoxide medium-temperature conversion by water vapour was shown. The composition of byproducts in the reaction of CO conversion and the concentration of impurities in condensate was calculated. The rheological properties of calcium and copper ferrites, as well as a catalyst on their basis, were studied.

Methanation of carbon monoxide on ordered mesoporous NiO–TiO2–Al2O3 composite oxides

RSC Advances ◽  
2016 ◽  
Vol 6 (25) ◽  
pp. 20971-20978 ◽  
Author(s):  
Qing Liu ◽  
Yuanyu Tian ◽  
Hongmei Ai
Keyword(s):  
Carbon Monoxide ◽  
Catalytic Activity ◽  
Confinement Effect ◽  
High Catalytic Activity ◽  
Composite Oxides ◽  
Al2o3 Composite ◽  
Ordered Mesoporous

An ordered mesoporous NiO–TiO2–Al2O3 catalyst can simultaneously exhibit high catalytic activity and stability, due to the confinement effect of the mesopore channels and the incorporation of the TiO2 species.

Gas-phase synthesis of morphology-controlled Pt nanoparticles and their impact on cinnamaldehyde hydrogenation

2019 ◽  
Vol 9 (9) ◽  
pp. 2097-2102 ◽  
Author(s):  
Sosuke Kato ◽  
Junya Ohyama ◽  
Masato Machida ◽  
Atsushi Satsuma
Keyword(s):  
Carbon Monoxide ◽  
Catalytic Activity ◽  
Gas Phase ◽  
Pt Nanoparticles ◽  
High Catalytic Activity ◽  
Protective Agent ◽  
Phase Synthesis ◽  
Gas Phase Synthesis ◽  
Cinnamaldehyde Hydrogenation

Pt nanoparticles of which morphology is controlled by gas-phase synthesis using carbon monoxide as a protective agent show high catalytic activity and selectivity for cinnamaldehyde hydrogenation.

COBALT OXIDE DECORATED FLOWER-LIKE g-C3N4 HYBRID NANOMATERIALS FOR CARBON MONOXIDE OXIDATION

2016 ◽  
Vol 24 (05) ◽  
pp. 1750058 ◽  
Author(s):  
YAN WANG ◽  
JING HUANG ◽  
JIANLIANG CAO ◽  
GAOJIE LI ◽  
ZHANYING ZHANG
Keyword(s):  
Carbon Monoxide ◽  
Catalytic Activity ◽  
Co Oxidation ◽  
Hydrothermal Method ◽  
Cobalt Oxide ◽  
Reaction Temperature ◽  
High Catalytic Activity ◽  
Total Conversion ◽  
Ft Ir ◽  
Excellent Stability

Co3O4 decorated flower-like g-C3N4 hybrid nanocatalysts were successfully synthesized and prepared via a facial hydrothermal method. The composition and morphology of the as-synthesized Co3O4/g-C3N4 nanocatalysts were characterized by the techniques of XRD, FT-IR, SEM, TEM, XPS and N2-sorption. The analysis results indicated that the as-synthesized samples possess the flower-like structure, which consisted of g-C3N4 nanosheets and Co3O4 nanoparticles with the size about 25[Formula: see text]nm. The as-prepared Co3O4/g-C3N4 catalysts possess high catalytic activity and excellent stability for carbon monoxide (CO) oxidation. The total conversion of Co can be kept for more than 48[Formula: see text]h under the reaction temperature of 120[Formula: see text]C.

Synthesis and high catalytic activity of mesoporous nanowires for carbon monoxide oxidation

2009 ◽  
Vol 149 (15-16) ◽  
pp. 585-588 ◽  
Author(s):  
Yuanguang Zhang ◽  
Youcun Chen ◽  
Juhong Zhou ◽  
Tao Wang ◽  
Yinguo Zhao
Keyword(s):  
Carbon Monoxide ◽  
Catalytic Activity ◽  
Carbon Monoxide Oxidation ◽  
High Catalytic Activity

Enhanced catalytic activity of low-Pt content nanocatalysts supported on hollow carbon spheres for the ORR in alkaline media

MRS Advances ◽  
2020 ◽  
Vol 5 (57-58) ◽  
pp. 2961-2972
Author(s):  
P.C. Meléndez-González ◽  
E. Garza-Duran ◽  
J.C. Martínez-Loyola ◽  
P. Quintana-Owen ◽  
I.L. Alonso-Lemus ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Anion Exchange ◽  
Average Particle Size ◽  
Synthesis Method ◽  
Alkaline Media ◽  
High Catalytic Activity ◽  
Average Particle ◽  
Carbon Spheres ◽  
Hollow Carbon ◽  
Hollow Carbon Spheres

In this work, low-Pt content nanocatalysts (≈ 5 wt. %) supported on Hollow Carbon Spheres (HCS) were synthesized by two routes: i) colloidal conventional polyol, and ii) surfactant-free Bromide Anion Exchange (BAE). The nanocatalysts were labelled as Pt/HCS-P and Pt/HCS-B for polyol and BAE, respectively. The physicochemical characterization of the nanocatalysts showed that by following both methods, a good control of chemical composition was achieved, obtaining in addition well dispersed nanoparticles of less than 3 nm TEM average particle size (d) on the HCS. Pt/HCS-B contained more Pt0 species than Pt/HCS-P, an effect of the synthesis method. In addition, the structure of the HCS remains more ordered after BAE synthesis, compared to polyol. Regarding the catalytic activity for the Oxygen Reduction Reaction (ORR) in 0.5 M KOH, Pt/HCS-P and Pt/HCS-B showed a similar performance in terms of current density (j) at 0.9 V vs. RHE than the benchmark commercial 20 wt. % Pt/C. However, Pt/HCS-P and Pt/HCS-B demonstrated a 6 and 5-fold increase in mass catalytic activity compared to Pt/C, respectively. A positive effect of the high specific surface area of the HCS and its interactions with metal nanoparticles and electrolyte, which promoted the mass transfer, increased the performance of Pt/HCS-P and Pt/HCS-B. The high catalytic activity showed by Pt/HCS-B and Pt/HCS-P for the ORR, even with a low-Pt content, make them promising cathode nanocatalysts for Anion Exchange Membrane Fuel Cells (AEMFC).

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