scholarly journals Preparation of Ce–Mn Composite Oxides with Enhanced Catalytic Activity for Removal of Benzene through Oxalate Method

Nanomaterials ◽  
2019 ◽  
Vol 9 (2) ◽  
pp. 197 ◽  
Author(s):  
Min Yang ◽  
Genli Shen ◽  
Mi Liu ◽  
Yunfa Chen ◽  
Zhen Wang ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Catalytic Property ◽  
Catalytic Properties ◽  
Synergistic Interaction ◽  
Benzene Oxidation ◽  
Oxygen Species ◽  
Pure Ceo2 ◽  
Catalytic Activities ◽  
Composite Oxides ◽  
Better Than

The catalytic activities of CeO2-MnOx composite oxides synthesized through oxalate method were researched. The results exhibited that the catalytic properties of CeO2-MnOx composite oxides were higher than pure CeO2 or MnOx. When the Ceat/Mnat ratio was 3:7, the catalytic activity reached the best. In addition, the activities of CeO2-MnOx synthesized through different routes over benzene oxidation were also comparative researched. The result indicated that the catalytic property of sample prepared by oxalate method was better than others, which maybe closely related with their meso-structures. Meanwhile, the effects of synergistic interaction and oxygen species in the samples on the catalytic ability can’t be ignored.

Controllable synthesis of Ni nanotube arrays and their structure-dependent catalytic activity toward dye degradation

CrystEngComm ◽  
2014 ◽  
Vol 16 (21) ◽  
pp. 4406-4413 ◽  
Author(s):  
Xiang-Zi Li ◽  
Kong-Lin Wu ◽  
Yin Ye ◽  
Xian-Wen Wei
Keyword(s):  
Catalytic Activity ◽  
Catalytic Properties ◽  
Dye Degradation ◽  
Nanotube Arrays ◽  
Nanorod Arrays ◽  
Growth Mechanisms ◽  
Controllable Synthesis ◽  
Catalytic Activities ◽  
One Step ◽  
The Relationship

Ni nanotube (nanorod) arrays are controllably fabricated by a one-step approach, the GDDATG and DDCG growth mechanisms are introduced. The Ni nanostructures present higher catalytic activities for dye degradation, the relationship between structures and catalytic properties is also studied.

Structures and Catalytic Activities of LaSrCoO4 and LaSrCoO3.6F0.4 Mixed Oxides

2011 ◽  
Vol 55-57 ◽  
pp. 1957-1961
Author(s):  
Xiao Mao Yang
Keyword(s):  
Particle Size ◽  
Catalytic Activity ◽  
Oxygen Vacancies ◽  
Mixed Oxides ◽  
Lattice Oxygen ◽  
Gel Method ◽  
Catalytic Activities ◽  
Surface Areas ◽  
Better Than

The perovskite-like LaSrCoO4and LaSrCoO3.6F0.4mixed oxides were prepared by the polyglycol gel method, investigated by using the XRD, TEM, BET, O2-TPD and XPS methods, and used successfully for CO and C3H8oxidization. The results indicate that LaSrCoO4and LaSrCoO3.6F0.4mixed oxides have K2NiF4structure. The catalytic activity of LaSrCoO4is better than that of LaSrCoO3.6F0.4, this is explained in terms of more mobile lattice oxygen, higher content of Co3+, more oxygen vacancies, smaller particle size and larger BET surface areas of LaSrCoO4.

FEATURES AND CATALYTIC PROPERTIES OF RhCu: A REVIEW

2010 ◽  
Vol 24 (25n26) ◽  
pp. 5128-5138 ◽  
Author(s):  
SILVIA GONZALEZ ◽  
CARMEN SOUSA ◽  
FRANCESC ILLAS
Keyword(s):  
Catalytic Activity ◽  
Bimetallic Catalysts ◽  
Catalytic Properties ◽  
Catalytic Activities ◽  
Cu Content ◽  
Bimetallic System

The study of bimetallic catalysts has scientific and technologic importance because of special catalytic activity towards several reactions. RhCu is an interesting bimetallic system due to combination of the very different catalytic activities of Rh and Cu. The catalytic activity of this bimetallic does not result from simple interpolation of the constituents. In fact, at low Cu content, the catalytic activity of RhCu is superior to that of Rh but when the Cu content is higher the activity decays. This is a curious trend which theoretical works had attempted to explain. This paper reports an overview of the most recent research works about this bimetallic system with emphasis in its especial characteristics.

scholarly journals Effect of Na2O Doping on the Surface and Catalytic Properties of the Mn2O3/Al2O3 System

1995 ◽  
Vol 12 (2) ◽  
pp. 119-128 ◽  
Author(s):  
G.A. El-Shobaky ◽  
A.M. Ghozza ◽  
S. Hammad
Keyword(s):  
Catalytic Activity ◽  
Active Sites ◽  
Catalytic Properties ◽  
Xrd Analysis ◽  
Manganese Carbonate ◽  
Oxidation Of Co ◽  
Mechanical Mixing ◽  
Catalytic Activities ◽  
Specific Catalytic Activity ◽  
Catalytically Active

Manganese/aluminium mixed oxide solids having the formula 0.2MnCO3/Al2O3 were prepared by mechanical mixing of a known weight of finely powdered manganese carbonate and aluminium hydroxide. The solids obtained were treated with NaNO3 (0.75–6 mol%) solution and dried at 110°C, then calcined in air at 500°C and 800°C for 6 h. The phases produced were identified by XRD analysis. The surface properties (SBET, Vp and r̄) of the pure and doped solids were studied by using N2 adsorption at – 196°C and their catalytic activities were determined by studying the oxidation of CO by O2at 125–300°C. The results obtained reveal that pure and doped mixed solids preheated in air at 500°C and 800°C consist of Mn2O3 (partridgite) and a poorly crystalline γ-alumina. Doping with sodium oxide at 500°C and 800°C resulted in a small decrease (14–19%) in the SBET value of the treated solids. However, this treatment brought about a significant modification in the catalytic activity of the doped solids. Doping with 0.75% Na2O at 500°C led to an increase of about 30–50% in the specific catalytic activity which was found to decrease on increasing the percentage of Na2O above this limit, falling to values smaller than that measured for the undoped catalyst. Doping at 800°C led to a progressive decrease in the activity of the treated solid to an extent proportional to the amount of dopant present. The doping process at 500°C and 800°C did not modify the mechanism of the catalytic reaction but altered the number of catalytically-active sites contributing in the catalysis of CO oxidation by O2 without changing their energetic nature.

scholarly journals Synthesis of Novel Heteroleptic Oxothiolate Ni(II) Complexes and Evaluation of Their Catalytic Activity for Hydrogen Evolution

Catalysts ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 401
Author(s):  
Fotios Kamatsos ◽  
Kostas Bethanis ◽  
Christiana A. Mitsopoulou
Keyword(s):  
Catalytic Activity ◽  
Catalytic Properties ◽  
Spectroscopic Methods ◽  
Electrochemical Studies ◽  
X Ray Diffraction ◽  
Neutral Form ◽  
Proton Reduction ◽  
X Ray ◽  
Better Than

Two heteroleptic nickel oxothiolate complexes, namely [Ni(bpy)(mp)] (1) and [Ni(dmbpy)(mp)] (2), where mp = 2-hydroxythiophenol, bpy = 2,2′-bipyridine and dmbpy = 4,4′-dimethyl-2,2′-bipyridine were synthesized and characterized with various physical and spectroscopic methods. Complex 2 was further characterized by single crystal X-ray diffraction data. The complex crystallizes in the monoclinic P 21/c system and in its neutral form. The catalytic properties of both complexes for proton reduction were evaluated with photochemical and electrochemical studies. Two different in their nature photosensitizers, namely fluorescein and CdTe-TGA-coated quantum dots, were tested under various conditions. The role of the electron donating character of the methyl substituents was revealed in the light of the studies. Thus, catalyst 2 performs better than 1, reaching 39.1 TONs vs. 4.63 TONs in 3 h, respectively, in electrochemical experiments. In contrast, complex 1 is more photocatalytically active than 2, achieving a TON of over 6700 in 120 h of irradiation. This observed reverse catalytic activity suggests that HER mechanism follows different pathways in electrocatalysis and photocatalysis.

Preparation, Characterization and Catalytic Properties of Nanostructured Mesoporous Au/CeO2

2015 ◽  
Vol 778 ◽  
pp. 144-147
Author(s):  
Si Qin Deligen ◽  
Bao Agula
Keyword(s):  
Catalytic Activity ◽  
Reduction Method ◽  
Catalytic Properties ◽  
Chemical Reduction ◽  
Nanoparticle Assembly ◽  
Complete Oxidation ◽  
Chemical Reduction Method ◽  
Total Oxidation ◽  
Catalytic Activities ◽  
Surfactant Assisted

The mesoporous CeO2were prepared via a surfactant-assisted method of nanoparticle assembly, CTAB was used as surfactant. The mesoporous CeO2were used as the supports for preparingxAu/CeO2catalysts by the chemical reduction method, and the catalytic activities of the total oxidation of propane were studied. The prepared catalysts were characterized by XRD, TEM and N2adsorption techniques. The content of Au can affect the catalytic properties of thexAu/CeO2catalysts. 4Au/CeO2exhibited the highest catalytic activity in propane complete oxidation with theT100of 420 °C.

Synthesis, Characterization and Catalytic Properties of La4BaCu5-xNixO13+δ (x=0, 1, 2, 3, 4, 5)

2009 ◽  
Vol 66 ◽  
pp. 57-60 ◽  
Author(s):  
Xue Hui Huang ◽  
Hao Chen ◽  
Ting Ting Wu
Keyword(s):  
Catalytic Activity ◽  
Catalytic Properties ◽  
Defect Structures ◽  
Ch4 Oxidation ◽  
Citrate Method ◽  
Catalytic Activities

A series of perovskite-like catalusts La4BaCu5-xNixO13＋δ (x=0,1,2,3,4,5) were prepared by the citrate method, the structures, forms, properties, and defect structures were studied by means of XRD, SEM, BET and TPD measurements. Meanwhile, their catalytic activities were evaluated by the studying of CO, CH4 oxidation. La4BaCu2Ni3O13+δ shows the highest catalytic activity.

scholarly journals Lab-Scale Investigation of Palm Shell Char as Tar Reforming Catalyst

Catalysts ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 476 ◽  
Author(s):  
Yen-Hau Chen ◽  
Max Schmid ◽  
Chia-Chi Chang ◽  
Ching-Yuan Chang ◽  
Günter Scheffknecht
Keyword(s):  
Catalytic Activity ◽  
Residence Time ◽  
Low Cost ◽  
Catalytic Activities ◽  
Palm Shell ◽  
Reforming Catalyst ◽  
Wood Char ◽  
Tar Reforming ◽  
Catalytic Steam Reforming ◽  
Better Than

This research investigated the application of palm shell char as a catalyst for the catalytic steam reforming of tar after the sorption enhanced gasification (SEG) process. The catalytic activities of palm shell char and metal-supported palm shell char were tested in a simulated SEG derived syngas with tar model compounds (i.e., toluene and naphthalene) at a concentration of 10 g m−3 NTP. The results indicated that palm shell char had an experimentally excellent catalytic activity for tar reforming with toluene and naphthalene conversions of 0.8 in a short residence time of 0.17 s at 900 °C. A theoretical residence time to reach the complete naphthalene conversion was 1.2 s at 900 °C for palm shell char, demonstrating a promising activity similar to wood char and straw char, but better than CaO. It was also found that potassium and iron-loaded palm shell chars exhibited much better catalytic activity than palm shell char, while the parallel reaction of gasification of K-loaded palm shell char influenced the conversion with its drastic mass loss. Moreover, contrary to CaO, palm shell char presented relatively low selectivity to benzene, and its spontaneous gasification generated extra syngas. In summary, the present study demonstrated that the low-cost material, palm shell char, can successfully be used as the tar-reforming catalyst after SEG process.

Promoted VOC oxidation over homogeneous porous CoxNiAlO composite oxides derived from hydrotalcites: effect of preparation method and doping

RSC Advances ◽  
2016 ◽  
Vol 6 (62) ◽  
pp. 56874-56884 ◽  
Author(s):  
Shuangde Li ◽  
Shengpeng Mo ◽  
Jiaqi Li ◽  
Haidi Liu ◽  
Yunfa Chen
Keyword(s):  
Catalytic Activity ◽  
Water Vapor ◽  
Layered Double Hydroxide ◽  
Preparation Method ◽  
Benzene Oxidation ◽  
Voc Oxidation ◽  
Composite Oxides ◽  
Double Hydroxide

CoxNiAlO powdered and film catalysts derived from layered double hydroxide precursors are prepared with excellent catalytic activity, reproducibility, reversibility, and stability to water vapor in benzene oxidation.

Catalytic Oxidation of Toluene over Fe2O3/Al2O3 Catalyst

2011 ◽  
Vol 695 ◽  
pp. 101-104 ◽  
Author(s):  
Takeshi Miki ◽  
Yutaka Tai
Keyword(s):  
Aqueous Solution ◽  
Catalytic Activity ◽  
Catalytic Oxidation ◽  
Catalytic Property ◽  
Iron Nitrate ◽  
Total Oxidation ◽  
Alumina Support ◽  
Wet Impregnation ◽  
Commercial Alumina ◽  
Better Than

Fe2O3/Al2O3 catalyst was prepared and the catalytic oxidation of toluene over the catalyst was investigated. The catalyst was prepared by wet impregnation of commercial alumina support. The support was impregnated with an aqueous solution of iron nitrate. The wet support was dried and calcined at 600-800 °C. The catalytic property of the catalyst was measured by the light-off curve of CO2 yield. All these catalysts were active for total oxidation of toluene above 250 °C. The catalytic activity of catalyst calcined at 600 °C was better than those of catalysts calcined at 700 and 800 °C.

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