Highly active and selective CoCu/ZnO catalysts prepared by mild oxalic acid co-precipitation method in dimethyl oxalate hydrogenation

2015 ◽  
Vol 65 ◽  
pp. 46-50 ◽  
Author(s):  
Xiangpeng Kong ◽  
Xiaochao Zhang ◽  
Jiangang Chen
Keyword(s):  
Oxalic Acid ◽  
Precipitation Method ◽  
Dimethyl Oxalate ◽  
Highly Active ◽  
Co Precipitation

Multidoped Ln3+ gadolinium dioxycarbonates as tunable white light emitting phosphors

2017 ◽  
Vol 46 (9) ◽  
pp. 2785-2792 ◽  
Author(s):  
I. Nelli ◽  
A. M. Kaczmarek ◽  
F. Locardi ◽  
V. Caratto ◽  
G. A. Costa ◽  
...  
Keyword(s):  
Oxalic Acid ◽  
White Light ◽  
Precipitation Method ◽  
Light Emitting ◽  
Co Precipitation ◽  
Co Doped

Gadolinium dioxycarbonates co-doped with different visible emitting lanthanides were synthesized via a co-precipitation method using oxalic acid as a precipitating agent.

A highly active K/Cu-Mn-O catalyst for the removal of nitric oxide in indoor air

2017 ◽  
Vol 28 (1) ◽  
pp. 7-16 ◽  
Author(s):  
Chan Wang ◽  
Feng Li ◽  
Zishu Sun ◽  
Qijun Song
Keyword(s):  
Nitric Oxide ◽  
Indoor Air ◽  
Photoelectron Spectroscopy ◽  
Elimination Rate ◽  
Surface Concentration ◽  
Precipitation Method ◽  
X Ray ◽  
Highly Active ◽  
Metal Nitrates ◽  
Co Precipitation

Nitric oxide is a frequently encountered pollutant in indoor air. It could have a number of harmful effects on human health even at low concentration. Aiming to improve the indoor air quality, an environment-friendly method was developed for the elimination of nitric oxide at ppm level based on a low temperature effective catalyst potassium-doped copper–manganese oxide (K/Cu-Mn-O). The catalyst was obtained through a co-precipitation method using metal nitrates in aqueous solution and the precipitate was calcinated at 400℃ for 5 h. After impregnation with K, the best catalytic activity was observed for the K/Cu-Mn-O catalyst with a Cu/Mn ratio of 1:2 and surface concentration of doping K 7.03% (7.4 mg/g). The composition and the structure of the catalyst were comprehensively characterized by X-ray diffraction, X-ray photoelectron spectroscopy, scanning electron microscopy, and Brunauer–Emmett–Teller. The results showed that the potassium doping improved the adsorption ability of catalyst, and promoted the formation of the nitrate salt, and thereby further improved the elimination rate of nitric oxide. Finally, the possible reaction mechanisms are discussed.

Preparation and Analysis of Magnetic Nanoparticles Used as Highly Active Catalysts over a Wide pH Range

2012 ◽  
Vol 424-425 ◽  
pp. 1057-1061
Author(s):  
Wei Wang ◽  
Tie Long Li ◽  
Ying Liu
Keyword(s):  
Magnetic Nanoparticles ◽  
Precipitation Method ◽  
Fe3o4 Magnetic Nanoparticles ◽  
Ph Adjustment ◽  
Highly Active ◽  
Wide Range ◽  
Iron Leaching ◽  
Wide Ph Range ◽  
Ph Range ◽  
Co Precipitation

In this work, Fe3O4 magnetic nanoparticles with high peroxidase-like catalytic activity and spontaneous pH adjustment ability were successfully prepared by co-precipitation method followed by appropriate thermal treatment. Key synthesis factors were identified and adjusted to tailor the crystallinity, chemical composition and then catalytic property. The crystal structure and Fe (II) content of the catalyst strongly affected its degradation efficiency. Phenol was completely removed by the optimal magnetic nanoparticles under a wide range of pH from 3.0 to 8.0. Additionally, this catalyst exhibited low iron leaching, good reusability and excellent potential to eliminate various organic pollutants from waste water. The reaction mechanism was discussed in terms of the formation of HO• and O2•−/HO2• radicals.

scholarly journals Synthesis of Cu–Mg/ZnO catalysts and catalysis in dimethyl oxalate hydrogenation to ethylene glycol: enhanced catalytic behavior in the presence of a Mg2+ dopant

RSC Advances ◽  
2017 ◽  
Vol 7 (78) ◽  
pp. 49548-49561 ◽  
Author(s):  
Xiangpeng Kong ◽  
Zheng Chen ◽  
Yuehuan Wu ◽  
Ruihong Wang ◽  
Jiangang Chen ◽  
...  
Keyword(s):  
Ethylene Glycol ◽  
Precipitation Method ◽  
Catalytic Behavior ◽  
Dimethyl Oxalate ◽  
Co Precipitation

Mg2+ doped nanoscale Cu–Mg/ZnO catalysts prepared by the co-precipitation method have been systematically characterized focusing on the amount of Mg2+ ions incorporated.

scholarly journals Preparation of highly active zinc oxide for photocatalytic removal of phenol: Direct calcination versus co-precipitation method

2015 ◽  
Vol 11 (3) ◽  
Author(s):  
Faisal Hussin ◽  
Hendrik O. Lintang ◽  
Lee Siew Ling ◽  
Leny Yuliati
Keyword(s):  
Zinc Oxide ◽  
Uv Light ◽  
Light Irradiation ◽  
Precipitation Method ◽  
Highly Active ◽  
Uv Light Irradiation ◽  
Photocatalytic Removal ◽  
Volmer Plot ◽  
Xrd Patterns ◽  
Co Precipitation

Photocatalytic removal of phenol under UV light irradiation was studied on zinc oxide (ZnO) photocatalysts, which were prepared via direct calcination (DC), and co-precipitation (CP) methods. The XRD patterns revealed that all of the prepared ZnO samples showed wurtzite structure, in which the ZnO-CP showed higher intensity of the diffraction peaks than the ZnO-DC sample. Optical and fluorescence properties of the prepared ZnO samples were similar to each other as confirmed by DR UV-Vis and fluorescence spectroscopy, respectively. The Stern-Volmer plot was investigated to study the interactions between the emission sites and the phenol. It was obtained that the emission sites of the ZnO-CP gave better interactions towards phenol molecules as compared to the ZnO-DC. After 6 hours reaction under UV light irradiation, the ZnO-CP sample showed two times higher photocatalytic activity for removal of phenol (10%) than that of the ZnO-DC (5%). It was suggested that the high activity observed on the ZnO-CP sample would be due to high crystallinity and good interactions with phenol. These results clearly suggested that the co-precipitation method was a good approach to prepare the highly active ZnO for the photocatalytic removal of phenol.

Influence of Organic Additives on Shape and Adsorbing Properties of Nano-Fe3O4 Particles

2012 ◽  
Vol 454 ◽  
pp. 41-45 ◽  
Author(s):  
Yi Min Zhu ◽  
Bin Bin Luo ◽  
Shu Chao Wan ◽  
Zhi Jun Ma ◽  
Yan Jun Li
Keyword(s):  
Oxalic Acid ◽  
Microwave Absorption ◽  
Magnetite Nanoparticles ◽  
Great Influence ◽  
Microwave Absorption Property ◽  
Precipitation Method ◽  
Complex Permeability ◽  
Absorption Property ◽  
Organic Additives ◽  
Co Precipitation

Nano-Fe3O4 powders were prepared by chemical co-precipitation method. The granularity, morphology and absorbing properties of the magnetite nanoparticles were characterized by XRD, SEM, TEM and complex permeability. The effects of organic additives to the granularity, morphology and microwave absorption property of nanosized magnetic Fe3O4 were studied. The results show that the organic additives have great influence on the morphology of nano-Fe3O4 particles. Spherical nano-Fe3O4 is prepared by oxalic acid. And the absorption property of nano-Fe3O4 is better.

scholarly journals Preparation of Mesoporous Structure Electrode Materials ZnMn2O4 by Co-precipitation Method

2020 ◽  
Vol 145 ◽  
pp. 02057
Author(s):  
Jiaxing Song ◽  
Tao Guo ◽  
Qiong Wang ◽  
Miao Yao ◽  
Yiming Mao
Keyword(s):  
Oxalic Acid ◽  
Electrode Material ◽  
Electrode Materials ◽  
Zinc Acetate Dihydrate ◽  
Mesoporous Structure ◽  
Xrd Analysis ◽  
Precipitation Method ◽  
Manganese Sulfate ◽  
Calcination Temperatures ◽  
Co Precipitation

In order to study the fast and efficient method of preparing electrode material ZnMn2O4, in this paper, oxalic acid was selected as the precipitator, oxalic acid dihydrate (C2H2O4•2H2O) as the chemical precipitator, manganese sulfate monohydrate (MnSO4•H2O) as the manganese source and zinc acetate dihydrate (C4H6O4Zn•2H2O) as the zinc source. The precursor was prepared by co-precipitation method. Then, ZnMn2O4 powders with mesoporous structure were obtained at different calcination temperatures. The phase of ZnMn2O4 powders at different calcination temperatures was characterized by XRD analysis. After considering the crystallinity and high temperature agglomeration, samples calcinated at 600oC were selected as the cathode material of the battery, and were characterized by SEM and TEM. The experimental results show that the electrode material ZnMn2O4 prepared by this method has high crystallinity, high preparation efficiency, energy saving, environmental protection and good dispersion.

scholarly journals High-yield synthesis of Ce modified Fe–Mn composite oxides benefitting from catalytic destruction of chlorobenzene

RSC Advances ◽  
2020 ◽  
Vol 10 (17) ◽  
pp. 10030-10037 ◽  
Author(s):  
Anqi Li ◽  
Hongming Long ◽  
Hongliang Zhang ◽  
Haijin Li
Keyword(s):  
Oxalic Acid ◽  
Precipitation Method ◽  
High Yield ◽  
Composite Oxides ◽  
Catalytic Destruction ◽  
Co Precipitation

Ce–Fe–Mn catalysts were prepared by an oxalic acid assisted co-precipitation method.

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