The catalytic activity of multi-walled carbon nanotubes (MWCNTs) in oxy-steam reforming of methanol (ASRM) was investigated for the first time. We demonstrate that CNTs are a potent catalytic ...material for hydrogen generation in oxy-steam reforming of methanol.
This review describes features of the structure of carbon nanotubes, their principal characteristics, methods of synthesis, and regions of potential application. Most attention has been paid to the ...use of nanotubes in catalysis. Examples are given of the functionalization of nanotubes and also their use as catalysts, catalytic additives, and catalyst supports.
In this paper we have demonstrated the possibility of the MWCNT growth on initially amorphous Co–Zr–N–O alloy thin film which was crystallized during heating followed by formation of Co particles on ...the surface. It was found that during CVD not only the growth of usual MWCNT array but also the formation of MWCNT arrays with a top covering layer and bilevel MWCNT arrays take place. The details of MWCNT array growth process are discussed. We have found that carbon nanotubes growth strongly depends on the Co concentration in the alloy film. The presented technique of MWCNT growth can be used in the preparation of new advanced engineering materials.
The formation of carbon nanotubes (CNTs) arrays by chemical vapor deposition on Me-Ct-N-(O) catalyst alloys, where Ct is a catalytic metal from the group Ni, Co, Fe, Pd; Me is transition metal of ...IV-VII of the Periodic Table of Elements, with low content of catalyst has been investigated. It is shown that CNTs effectively grow, if the alloy contains Ti, V, Cr, Zr, Hf, Nb and Ta. The structure of CNT were studied by transmission and scanning-electron microscopy, energy-dispersive X-ray and the Raman spectroscopy.
New complexes with formulae: Zn(CClH
2
COO)
2
·2H
2
O, Zn(CCl
2
HCOO)
2
·2H
2
O, Zn(CCl
3
COO)
2
·2H
2
O, Cd(CCl
2
HCOO)
2
·H
2
O, Cd(CCl
3
COO)
2
·2H
2
O and Pb(CCl
3
COO)
2
·2H
2
O, were prepared ...and characterized by chemical, elemental analysis and IR spectroscopy. The nature of metal–ligand coordination was studied. They are small crystalline. The thermal properties of compounds in the solid state were studied using TG–DTG techniques under dynamic flowing air atmosphere. Mass spectrometer was used to analyze principal volatile thermal decomposition and fragmentation products of Zn(CCl
3
COO)
2
·2H
2
O evolved during pyrolysis in dynamic flowing air and in argon atmosphere.
Results are given for a study of the catalytic and physicochemical properties of monometallic Cu/CeO
2
-Al
2
O
3
and bimetallic Pd-Cu/CeO
2
-Al
2
O
3
catalysts for the synthesis of methanol from ...hydrogen and carbon dioxide. The catalytic activity was determined in methanol synthesis in a gradientless reactor at 200°C and 3.5 MPa. The physicochemical properties of these catalytic systems were studied by the BET method (Brunauer−Emmett− Teller method), temperature-programmed reduction of hydrogen (TPR-H
2
), temperature-programmed desorption of ammonia (TPD-NH
3
), x-ray diffraction (XRD), and Fourier-transform IR spectroscopy (FTIR). Our results showed high activity for the palladium-promoted catalyst, which is attributed to a synergistic effect between palladium and copper as well as the formation of a PdCu alloy during activation of this bimetallic catalyst in a reducing atmosphere of 5% H
2
95% Ar.
Catalytic properties of monometallic Ni and bimetallic Ru–Ni supported on Al
2
O
3
, CaO–Al
2
O
3
, and MgO–Al
2
O
3
have been studied in mixed reforming of methane. Physicochemical properties of the ...catalytic systems have been studied by X-ray diffraction, scanning electron microscopy with energy dispersive spectroscope and temperature-programmed reduction by hydrogen. It has been shown that, of all the studied samples, the highest conversion of methane and carbon dioxide is achieved in the presence of the Ru−Ni/MgO–Al
2
O
3
bimetallic catalyst. Temperature-programmed reduction has confirmed the effect of hydrogen spillower from ruthenium to NiO. The formation of Ru–Ni alloy has also been found.
Monometallic nickel and bimetallic ruthenium–nickel catalysts supported onto aluminum oxide without additives and aluminum oxide modified with MgO and CaO were prepared by an impregnation method. The ...catalysts were tested in the process of the mixed reforming of methane, and their properties were characterized by thermogravimetry, scanning electron microscopy, and X-ray diffractometry. The total organic carbon content of the catalysts was also measured. The promoting effect of ruthenium and structural promoters on the catalytic activity of Ni/Al
2
O
3
was confirmed. The Ru–Ni/MgO–Al
2
O
3
catalyst exhibited the highest stability and activity; this fact can be explained by the increased adsorption of methane on the surface of ruthenium–nickel clusters.
New complexes with formulae: Zn(CClH.sub.2COO).sub.2·2H.sub.2O, Zn(CCl.sub.2HCOO).sub.2·2H.sub.2O, Zn(CCl.sub.3COO).sub.2·2H.sub.2O, Cd(CCl.sub.2HCOO).sub.2·H.sub.2O, Cd(CCl.sub.3COO).sub.2·2H.sub.2O ...and Pb(CCl.sub.3COO).sub.2·2H.sub.2O, were prepared and characterized by chemical, elemental analysis and IR spectroscopy. The nature of metal-ligand coordination was studied. They are small crystalline. The thermal properties of compounds in the solid state were studied using TG-DTG techniques under dynamic flowing air atmosphere. Mass spectrometer was used to analyze principal volatile thermal decomposition and fragmentation products of Zn(CCl.sub.3COO).sub.2·2H.sub.2O evolved during pyrolysis in dynamic flowing air and in argon atmosphere.
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