Complex Metal Halide Oxides (3). Structural Characteristics and Catalytic Performance of Lanthanum-Substituted X1X2 Type Complex Bismuth Chloride Oxides

1999 ◽  
Vol 72 (5) ◽  
pp. 997-1004 ◽  
Author(s):  
Sui Wen Lin ◽  
Wataru Ueda
Keyword(s):  
Structural Characteristics ◽  
Catalytic Performance ◽  
Metal Halide ◽  
Complex Metal ◽  
Type Complex ◽  
Bismuth Chloride

Complex Metal Halide Oxides (1): Bismuth Chloride Oxides Having Various Structures as Catalysts for Oxidative Coupling of Methane

1996 ◽  
Vol 69 (2) ◽  
pp. 485-491 ◽  
Author(s):  
Wataru Ueda ◽  
Toshio Isozaki ◽  
Fuyuhiko Sakyu ◽  
Satoshi Nishiyama ◽  
Yutaka Morikawa
Keyword(s):  
Oxidative Coupling ◽  
Oxidative Coupling Of Methane ◽  
Metal Halide ◽  
Complex Metal ◽  
Bismuth Chloride

scholarly journals Catalysis of Organic Pollutants Abatement Based on Pt-Decorated Ag@Cu2O Heterostructures

Molecules ◽  
2019 ◽  
Vol 24 (15) ◽  
pp. 2721
Author(s):  
Xiaolong Zhang ◽  
Bingbing Han ◽  
Yaxin Wang ◽  
Yang Liu ◽  
Lei Chen ◽  
...  
Keyword(s):  
Catalytic Reduction ◽  
Structural Characteristics ◽  
Organic Pollutant ◽  
Pt Nanoparticles ◽  
Catalytic Performance ◽  
Pt Nanoparticle ◽  
Local Surface ◽  
Local Surface Plasmon Resonance ◽  
Cu2o Nanoparticles ◽  
Excellent Catalytic Performance

Pt-decorated Ag@Cu2O heterostructures were successfully synthesized using a simple and convenient method. The Pt nanoparticle density on the Ag@Cu2O can be controlled by changing the concentration of the Pt precursor. The synthesized Ag@Cu2O–Pt nanoparticles exhibited excellent catalytic performance, which was greatly affected by changes in the Ag@Cu2O–Pt structure. To optimize the material’s properties, the synthesized Ag@Cu2O–Pt nanoparticles were used to catalyze toxic pollutants and methyl orange (MO), and nontoxic products were obtained by catalytic reduction. The Pt-decorated Ag@Cu2O nanoparticles showed excellent catalytic activity, which significantly decreased the pollutant concentration when the nanoparticles were used for catalytic reduction. The redistribution of charge transfer is the nanoparticles’ main contribution to the catalytic degradation of an organic pollutant. This Pt-decorated Ag@Cu2O material has unique optical and structural characteristics that make it suitable for photocatalysis, local surface plasmon resonance, and peroxide catalysis.

scholarly journals Catalytic Performance of SBA-15-Supported Poly (Styrenesulfonic Acid) in the Esterification of Acetic Acid with n-Heptanol

2020 ◽  
Vol 10 (17) ◽  
pp. 5835
Author(s):  
Abdulaziz Ali Alghamdi ◽  
Yahya Musawi Mrair ◽  
Fahad A. Alharthi ◽  
Abdel-Basit Al-Odayni
Keyword(s):  
Acetic Acid ◽  
Sulfonic Acid ◽  
Active Sites ◽  
Structural Characteristics ◽  
High Surface ◽  
High Surface Area ◽  
Reaction Times ◽  
Hydrophobic Surface ◽  
Catalytic Performance ◽  
Catalyst Load

A polystyrene sulfonic acid-functionalized mesoporous silica (SBA-15-PSSA) catalyst was synthesized via an established multistep route, employing 2-bromo-2-methylpropionyl bromide as initiator of atom transfer radical polymerization. Fourier-transform infrared spectroscopy, thermogravimetric/differential thermal, Brunauer–Emmett–Teller, and transmission electron microscopy analyses revealed outstanding structural characteristics of the catalyst, including highly ordered mesopores, high surface area (726 m2/g), and adequate estimated concentrations of active sites (0.70 mmol H+/g). SBA-15-PSSA’s catalytic performance was evaluated in the esterification of acetic acid and n-heptanol as a model system at various temperatures (50–110 °C), catalyst loads (0.1–0.3 g), and reaction times (0–160 min). The conversion percentage of acetic acid was found to increase with the temperature, catalyst load, and reaction time. Furthermore, results indicated a fast conversion in the first 20 min of the reaction, with remarkable conversion values at 110 °C, reaching 86%, 94%, and 97% when the catalyst load was 0.1, 0.2, and 0.3 g, respectively; notably, at this temperature, 100% conversation was achieved after 60 min. At 110 °C, the reaction conducted in the presence of 0.3 g of catalyst displayed more than 6.4 times the efficiency of the uncatalyzed reaction. Such activity is explained by the concomitant presence in the polymer of strong sulfonic acid moieties and a relatively high hydrophobic surface, with adequate numbers of active sites for ester production.

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