Decomposition of Methane over Iron Catalysts at the Range of Moderate Temperatures: The Influence of Structure of the Catalytic Systems and the Reaction Conditions on the Yield of Carbon and Morphology of Carbon Filaments

2001 ◽  
Vol 201 (2) ◽  
pp. 183-197 ◽  
Author(s):  
Marina A Ermakova ◽  
Dmitry Yu Ermakov ◽  
Andrey L Chuvilin ◽  
Gennady G Kuvshinov
Keyword(s):  
Iron Catalysts ◽  
Reaction Conditions ◽  
Catalytic Systems ◽  
Carbon Filaments ◽  
Decomposition Of Methane

scholarly journals Selective Styrene Oxidation to Benzaldehyde over Recently Developed Heterogeneous Catalysts

Molecules ◽  
2021 ◽  
Vol 26 (6) ◽  
pp. 1680
Author(s):  
Marta A. Andrade ◽  
Luísa M. D. R. S. Martins
Keyword(s):  
Heterogeneous Catalysts ◽  
Carbon Materials ◽  
Oxygen Species ◽  
Styrene Oxidation ◽  
Reaction Conditions ◽  
Reactive Metal ◽  
Catalytic Systems ◽  
Tert Butyl Hydroperoxide ◽  
Metal Organic ◽  
Important Intermediate

The selective oxidation of styrene under heterogeneous catalyzed conditions delivers environmentally friendly paths for the production of benzaldehyde, an important intermediate for the synthesis of several products. The present review explores heterogeneous catalysts for styrene oxidation using a variety of metal catalysts over the last decade. The use of several classes of supports is discussed, including metal–organic frameworks, zeolites, carbon materials and silicas, among others. The studied catalytic systems propose as most used oxidants tert-butyl hydroperoxide, and hydrogen peroxide and mild reaction conditions. The reaction mechanism proceeds through the generation of an intermediate reactive metal–oxygen species by catalyst-oxidant interactions. Overall, most of the studies highlight the synergetic effects among the metal and support for the activity and selectivity enhancement.

Catalytic decomposition of methane over rare earth metal (Ce and La) oxides supported iron catalysts

2019 ◽  
Vol 467-468 ◽  
pp. 236-248 ◽  
Author(s):  
Manoj Pudukudy ◽  
Zahira Yaakob ◽  
Qingming Jia ◽  
Mohd Sobri Takriff
Keyword(s):  
Rare Earth ◽  
Rare Earth Metal ◽  
Earth Metal ◽  
Catalytic Decomposition ◽  
Iron Catalysts ◽  
Decomposition Of Methane ◽  
Supported Iron

scholarly journals Recent Advances in Photocatalytic Transformation of Carbohydrates Into Valuable Platform Chemicals

2021 ◽  
Vol 3 ◽  
Author(s):  
Huan Chen ◽  
Kun Wan ◽  
Fangjuan Zheng ◽  
Zhuo Zhang ◽  
Hongyu Zhang ◽  
...  
Keyword(s):  
Solar Energy ◽  
Scientific Community ◽  
Value Added ◽  
Reaction Pathways ◽  
Future Perspective ◽  
Reaction Conditions ◽  
Catalytic Systems ◽  
Selective Transformation ◽  
Platform Chemicals ◽  
Broad Interest

In response to the less accessible fossil resources and deteriorating environmental problems, catalytic conversion of the abundant and renewable lignocellulosic biomass to replace fossil resources for the production of value-added chemicals and fuels is of great importance. Depolymerization of carbohydrate and its derivatives can obtain a series of C5-C6 monosaccharides (e.g., glucose and xylose) and their derived platform compounds (e.g., HMF and furfural). Selective transformation of lignocellulose using sustainable solar energy via photocatalysis has attract broad interest from a growing scientific community. The unique photogenerated reactive species (e.g., h+, e−, •OH, •O2−, and 1O2), novel reaction pathways as well as the mild reaction conditions make photocatalysis a “dream reaction.” This review is aimed to provide an overview of the up-to-date contributions achieved in the selective photocatalytic transformation of carbohydrate and its derivatives. Photocatalytic methods, properties and merits of different catalytic systems are well summarized. We then put forward future perspective and challenges in this field.

scholarly journals Cyclopentadienone Iron Tricarbonyl Complexes-Catalyzed Hydrogen Transfer in Water

Molecules ◽  
2020 ◽  
Vol 25 (2) ◽  
pp. 421 ◽  
Author(s):  
Daouda Ndiaye ◽  
Sébastien Coufourier ◽  
Mbaye Diagne Mbaye ◽  
Sylvain Gaillard ◽  
Jean-Luc Renaud
Keyword(s):  
Metal Complexes ◽  
Hydrogen Transfer ◽  
Low Cost ◽  
Pure Water ◽  
Free Water ◽  
Water Soluble ◽  
Tricarbonyl Complex ◽  
Reaction Conditions ◽  
Catalytic Systems ◽  
Iron Tricarbonyl

The development of efficient and low-cost catalytic systems is important for the replacement of robust noble metal complexes. The synthesis and application of a stable, phosphine-free, water-soluble cyclopentadienone iron tricarbonyl complex in the reduction of polarized double bonds in pure water is reported. In the presence of cationic bifunctional iron complexes, a variety of alcohols and amines were prepared in good yields under mild reaction conditions.

scholarly journals Direct Catalytic Conversion of CO2 to Cyclic Organic Carbonates under Mild Reaction Conditions by Metal—Organic Frameworks

Catalysts ◽  
2019 ◽  
Vol 9 (1) ◽  
pp. 34 ◽  
Author(s):  
Seong Huh
Keyword(s):  
Metal Organic Framework ◽  
Cycloaddition Reaction ◽  
Co2 Concentration ◽  
Reaction Conditions ◽  
Catalytic Systems ◽  
Heterogeneous Catalytic ◽  
Electrochemical Conversion ◽  
Modern Chemical ◽  
Metal Organic ◽  
Carbon Dioxide Co2

The reduction of the representative greenhouse gas, carbon dioxide (CO2), is significantly an important theme for the current research in the modern chemical world. For the last two decades, the development of new metal-organic framework (MOF) systems with highly selective capture of CO2, in the presence of other competing gaseous molecules, has flourished to capture or separate CO2 for environmental protection. Nonetheless, the ultimate resolution to lessen the atmospheric CO2 concentration may be in the chemical or electrochemical conversion of CO2 to other compounds. In this context, the catalytic cycloaddition reaction of CO2 into organic epoxides to produce cyclic carbonates is a more attractive method. MOFs are being proven as efficient heterogeneous catalytic systems for this important reaction. In this review, we collected very recent progress in MOF-based catalytic systems, fully operable under very mild reaction conditions (room temperature and 1 atm CO2).

XANES analysis of catalytic systems under reaction conditions

2002 ◽  
Vol 44 (1) ◽  
pp. 59-121 ◽  
Author(s):  
Marcos Fernández-García
Keyword(s):  
Reaction Conditions ◽  
Catalytic Systems ◽  
Xanes Analysis

Soldering of Iron Catalysts for Direct Synthesis of Light Olefins from Syngas under Mild Reaction Conditions

ACS Catalysis ◽  
2017 ◽  
Vol 7 (10) ◽  
pp. 6445-6452 ◽  
Author(s):  
Vitaly V. Ordomsky ◽  
Yuan Luo ◽  
Bang Gu ◽  
Alexandre Carvalho ◽  
Petr A. Chernavskii ◽  
...  
Keyword(s):  
Direct Synthesis ◽  
Light Olefins ◽  
Iron Catalysts ◽  
Reaction Conditions

scholarly journals Catalytic ethanolysis of fructan-rich and starchy expired food into biofuel 5-ethoxymethylfurfural

BioResources ◽  
2021 ◽  
Vol 16 (3) ◽  
pp. 6186-6200
Author(s):  
Luxin Zhang ◽  
Yuting Liu ◽  
Chang Liu ◽  
Simin Yi ◽  
Wen Sun ◽  
...  
Keyword(s):  
Reaction Time ◽  
Conversion Efficiency ◽  
Egg Yolk ◽  
Catalyst Loading ◽  
Strongly Correlated ◽  
Reaction Conditions ◽  
Catalytic Systems ◽  
Garlic Powder ◽  
Catalyst Type

Catalytic systems were investigated for the ethanolysis of expired food into 5-ethoxymethylfurfural (5-EMF). Fructan-rich expired food (expired probiotics beverage powder, onion powder, garlic powder, and burdock tea), and starchy expired food (expired steamed buns and egg yolk battercake) were tested as starting substrates. Optimization of the reaction conditions included varying the catalyst type, temperature, catalyst loading, and reaction time to maximize 5-EMF yield. Several co-solvents were added to evaluate their impact on the generation of 5-EMF. The selected expired foods produced 5-EMF yields ranging from 0.2 mol% to 68 mol%. The 5-EMF yield from fructan-rich expired food was more noticeably affected by the content of the non-carbohydrate part than that from starchy expired food. The effect of co-solvents on conversion efficiency was closely related to the catalyst type but was not strongly correlated with the feedstock used. This study provides a facile way to produce biofuel chemicals from carbohydrate-rich expired food.

scholarly journals Heterogeneous base-catalyzed methanolysis of vegetable oils: State of art

2010 ◽  
Vol 64 (2) ◽  
pp. 63-80 ◽  
Author(s):  
Marija Miladinovic ◽  
Ivana Lukic ◽  
Olivera Stamenkovic ◽  
Vlada Veljkovic ◽  
Dejan Skala
Keyword(s):  
Catalyst Preparation ◽  
Biodiesel Production ◽  
Huge Amount ◽  
Reaction Conditions ◽  
Catalytic Systems ◽  
Production Technologies ◽  
Heterogeneous Base ◽  
Near Future ◽  
State Of Art

Today, homogeneous base-catalyzed methanolysis is most frequently used method for industrial biodiesel production. High requirements for the quality of feedstocks and the problems related to a huge amount of wastewaters have led to the development of novel biodiesel production technologies. Among them, the most important is heterogeneous base-catalyzed methanolysis, which has been intensively investigated in the last decade in order to develop new catalytic systems, to optimize the reaction conditions and to recycle catalysts. These studies are a base for developing continuous biodiesel production on industrial scale in near future. The present work summarizes up-to-date studies on biodiesel production by heterogeneous base-catalyzed methanolysis. The main goals were to point out the application of different base compounds as catalysts, the methods of catalyst preparation, impregnation on carriers and recycling as well as the possibilities to improve existing base-catalyzed biodiesel production processes and to develop novel ones.

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