Three helical chain-based 3D coordination polymers: solvent-induced syntheses, tunable structures and catalytic properties for the Strecker reaction

CrystEngComm ◽  
2019 ◽  
Vol 21 (36) ◽  
pp. 5440-5447 ◽  
Author(s):  
Juan Chai ◽  
Ping Zhang ◽  
Xiangxiang Shi ◽  
Jing Sun ◽  
Li Wang ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Coordination Polymers ◽  
Catalytic Properties ◽  
Isophthalic Acid ◽  
Optically Active ◽  
Helical Chain ◽  
Strecker Reaction ◽  
Good Catalytic Activity

Three 3D Sc-CPs with different helical chains have been synthesized from isophthalic acid derivatives by solvent induced methods. Among them, 3 is optically active. Furthermore, 1 exhibits good catalytic activity for the Strecker reactions.

Stability and catalytic properties of μ-oxo and μ-nitrido dimeric iron tetrasulfophthalocyanines in the oxidation of Orange II by tert-butylhydroperoxide

2014 ◽  
Vol 18 (07) ◽  
pp. 604-613 ◽  
Author(s):  
Anna S. Makarova ◽  
Evgeny V. Kudrik ◽  
Sergei V. Makarov ◽  
Oskar I. Koifman
Keyword(s):  
Catalytic Activity ◽  
Aqueous Solutions ◽  
Catalytic Oxidation ◽  
Organic Compounds ◽  
High Stability ◽  
Catalytic Properties ◽  
Orange Ii ◽  
Tert Butylhydroperoxide ◽  
Good Catalytic Activity ◽  
Very High

A study of catalytic activity of μ-nitrido- and μ-oxo-dimeric iron tetrasulfophthalocyanines in the oxidation of Orange II by tert-butylhydroperoxide in aqueous solutions has been performed. It is shown that though in one catalytic cycle activity of μ-oxo-dimer is higher, stability of this complex in oxidative conditions is poor. μ-nitrido-dimer combines relatively good catalytic activity with very high stability in the presence of tert-butylhydroperoxide. The mechanisms of oxidative decomposition of dimers and catalytic oxidation of Orange II have been proposed on the base of kinetic results. The products of catalytic processes are shown to be bio-degradable non-toxic small organic compounds.

Structural diversity and catalytic properties of five Co2(COO)4cluster-based coordination polymers modified with R-isophthalic acid (R = H, NO2, CH3, OH andtBu)

CrystEngComm ◽  
2017 ◽  
Vol 19 (34) ◽  
pp. 5038-5047 ◽  
Author(s):  
Jian-Yong Zhang ◽  
Jun-Xia Shi ◽  
Peng-Hui Cui ◽  
Zi-Jian Yao ◽  
Wei Deng
Keyword(s):  
Coordination Polymers ◽  
Catalytic Properties ◽  
Knoevenagel Condensation ◽  
Structural Diversity ◽  
Isophthalic Acid

By regulation the substituents on 5-position of isophthalic acid, we isolated five Co-based CPs with structural diversity, which all constructed from the Co2(COO)4unit. The catalytic properties for Knoevenagel condensation and selective epoxidation of styrene have also been investigated.

From 1D to 3D lanthanide coordination polymers constructed with pyridine-3,5-dicarboxylic acid: synthesis, crystal structures, and catalytic properties

RSC Advances ◽  
2016 ◽  
Vol 6 (68) ◽  
pp. 63425-63432 ◽  
Author(s):  
Xiao-Ming Lin ◽  
Ji-Liang Niu ◽  
Pei-Xian Wen ◽  
Yan-Na Lu ◽  
Lei Hu ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Dicarboxylic Acid ◽  
Crystal Structures ◽  
Coordination Polymers ◽  
Catalytic Properties ◽  
Structural Difference ◽  
Acid Synthesis ◽  
Lanthanide Coordination Polymers ◽  
Lanthanide Contraction

Three series of lanthanide coordination polymers have been synthesized. The structural difference may be derived from the lanthanide contraction. Moreover, we also discussed the size-selective catalytic activity towards cyanosilylation of aldehydes.

Catalytic Decomposition of Methane: Effect of Various Factors on Catalytic Properties

2007 ◽  
Vol 544-545 ◽  
pp. 23-26 ◽  
Author(s):  
Hyun Chang Shin ◽  
Hyun Jung Kim ◽  
Dong Shin Yun ◽  
Jung Whan Yoo ◽  
Dong Jin Lee ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Reaction Temperature ◽  
Methane Conversion ◽  
Catalytic Properties ◽  
Catalytic Decomposition ◽  
Good Catalytic Activity ◽  
Decomposition Of Methane ◽  
Mesoporous Supports ◽  
Mcm 41

The effect of various reaction factors such as amount of Ni loaded, temperature, and variety of supports on the methane conversion were investigated to obtain higher methane conversion. The high activities were observed over Ni(10 wt%)/SiO2 catalyst and at 650oC of reaction temperature. Catalysts using mesoporous supports such as SiO2 and MCM-41 showed good catalytic activity and stability.

scholarly journals The Determing Activation Energy of Total Oxidation Reaction of m-xylene over La0,7Sr0,3BO3 (B = Mn, Fe, Ni) Perovskite Catalysts

2017 ◽  
Vol 33 (4) ◽  
Author(s):  
Tran Thi Thu Huyen ◽  
Tran Thi Luyen ◽  
Nguyen Thi Tuyet Mai
Keyword(s):  
Activation Energy ◽  
Catalytic Activity ◽  
Oxidation Reaction ◽  
Mixed Oxides ◽  
Catalytic Properties ◽  
Rare Earth Ions ◽  
Exhaust Emission ◽  
Total Oxidation ◽  
Low Reaction Temperature ◽  
Good Catalytic Activity

Perovskite-type oxides containing rare earth ions and transition metals are of interest for catalytic oxidation and reduction reactions associated with automotive exhaust emission control. They are known to exhibit a good catalytic activity in the total oxidation reaction of carbon monoxide or hydrocarbon and removal of nitrogen oxides. By partially substitution of A and B ions of the perovskite with others, a wide variety of mixed oxides A1-xA’xB1-yB’yO3 can be obtained, allowing the systematic modification of the catalytic properties. We presented the preparation and the catalytic properties of and La0.7Sr0.3BO3 (B = Mn, Fe, Ni) perovskites in total oxidation of m-xylene in previous report. Obtained results showed that they exhibit a good catalytic activity in total oxidation of  m-xylene at relatively low reaction temperature. In present work, the activation energy of total oxidation reaction of m-xylene over these catalysts are determined. The results show that the activation energy of studied catalyst is ranging about from 11.5 to 13.4 kcal/mol. The replacement of Mn by Fe and Ni in La0.7Sr0.3MnO3  perovskite catalyst reduces the catalytic property of  La0.7Sr0.3MnO3 catalyst and increases the activation energy of the total oxidation reaction of m-xylene. 

High resolution electron microscopy of lanthanum phosphate crystals

1978 ◽  
Vol 36 (1) ◽  
pp. 274-275
Author(s):  
J. C. Wheatley ◽  
J. M. Cowley
Keyword(s):  
Electron Microscopy ◽  
Catalytic Activity ◽  
High Resolution ◽  
Petroleum Industry ◽  
High Resolution Electron Microscopy ◽  
Lanthanum Phosphate ◽  
Good Catalyst ◽  
Resolution Electron ◽  
Good Catalytic Activity ◽  
Physical And Chemical

Rare-earth phosphates are of particular interest because of their catalytic properties associated with the hydrolysis of many aromatic chlorides in the petroleum industry. Lanthanum phosphates (LaPO4) which have been doped with small amounts of copper have shown increased catalytic activity (1). However the physical and chemical characteristics of the samples leading to good catalytic activity are not known.Many catalysts are amorphous and thus do not easily lend themselves to methods of investigation which would include electron microscopy. However, the LaPO4, crystals are quite suitable samples for high resolution techniques.The samples used were obtained from William L. Kehl of Gulf Research and Development Company. The electron microscopy was carried out on a JEOL JEM-100B which had been modified for high resolution microscopy (2). Standard high resolution techniques were employed. Three different sample types were observed: 669A-1-5-7 (poor catalyst), H-L-2 (good catalyst) and 27-011 (good catalyst).

Decomposition of hydrogen peroxide on a two-component NiO-CdO catalyst and the effect of ionizing radiation on its catalytic properties

1979 ◽  
Vol 44 (4) ◽  
pp. 1015-1022 ◽  
Author(s):  
Viliam Múčka
Keyword(s):  
Aqueous Solution ◽  
Hydrogen Peroxide ◽  
Catalytic Activity ◽  
Nickel Oxide ◽  
Catalytic Properties ◽  
Cadmium Oxide ◽  
Chemisorb Oxygen ◽  
Composition Region ◽  
Chemisorbed Oxygen ◽  
Two Component

The catalytic properties of two-component catalyst nickel oxide-cadmium oxide with the proportions of the components covering the whole composition region 0-100% were examined by studying the decomposition of hydrogen peroxide in aqueous solution on it. In the range 0-25 mol.% CdO, cadmium oxide is found to affect infavourably the ability of nickel oxide to chemisorb oxygen. The amount of the chemisorbed oxygen increases several times on gamma irradiation of the samples. The effect of cadmium oxide on the catalytic activity of the system shows up in fresh samples only indirectly via the changed amount of the oxygen chemisorbed. In older samples the initial catalytic activity of the system is changed, which can be explained based on the concept of bivalent catalytic centres in terms of the co-action of the catalytic centres of the two oxides, which are in equilibrium. The irradiation of the system under study speeds up the processes leading to the establishing of this equilibrium which is thermally very stable, and results in a substantial increase of the catalytic activity of the samples investigated.

Hydrogen peroxide decomposition on a two-component CuO-Cr2O3 catalyst

1988 ◽  
Vol 53 (8) ◽  
pp. 1636-1646 ◽  
Author(s):  
Viliam Múčka ◽  
Kamil Lang
Keyword(s):  
Hydrogen Peroxide ◽  
Catalytic Activity ◽  
Extreme Values ◽  
Catalytic Properties ◽  
Active Components ◽  
Catalytic Systems ◽  
Heterogeneous Catalytic ◽  
Peroxide Decomposition ◽  
Two Component ◽  
Catalytically Active

Some physical and catalytic properties of the two-component copper(II)oxide-chromium(III)oxide catalyst with different content of both components were studied using the decomposition of the aqueous solution of hydrogen peroxide as a testing reaction. It has been found that along to both basic components, the system under study contains also the spinel structure CuCr2O4, chromate washable by water and hexavalent ions of chromium unwashable by water. The soluble chromate is catalytically active. During the first period of the reaction the equilibrium is being established in both homogeneous and heterogeneous catalytic systems. The catalytic activity as well as the specific surface area of the washed solid is a non-monotonous function of its composition. It seems highly probable that the extreme values of both these quantities are not connected with the detected admixtures in the catalytic system. The system under study is very insensitive with regard to the applied doses of gamma radiation. Its catalytic properties are changed rather significantly after the thermal treatment and particularly after the partial reduction to low degree by hydrogen. The observed changes of the catalytic activity of the system under study are very probably in connection with the changes of the valence state of the catalytically active components of the catalyst.

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