A catalyst for manufacturing entangled type carbon nanotubes, which makes it possible to manufacture entangled type carbon nanotubes at a high rate, and a manufacturing method for entangled type carbon nanotubes, which makes it possible to manufacture entangled type carbon nanotubes using the catalyst, are described.

Complexes of polyoxometalate (POM) cluster anions and nanoparticle (NP) cores, are disclosed, featuring inherent thermodynamic stability at least due to covalent bonds, which attach the POMs to the NP cores. The nanoparticles comprise a plurality of crystalline, polycrystalline or amorphous metal-oxide, metal oxyhydroxide and/or metal hydroxide compounds. The POM and NP, each independently, may comprise one, two, three or more different metal cations, particularly transition or main group metal cations. These complexes are highly soluble in water and inherently stable to oxidation and hydrolysis in a broad pH range. As such, the complexes are useful, inert alia, as improved soluble water-oxidation catalysts and stabilizers of metastable crystals.

This invention is directed to a catalyst composition comprising one or more rare earth oxophosphorus components, and process for making such.

One embodiment of the present disclosure provides a method of preparing a catalyst for manufacturing carbon nanotubes, which includes: (a) dissolving a metal precursor in a solvent to prepare a precursor solution; (b) thermally decomposing the precursor solution by spraying the precursor solution into a reactor; and (c) obtaining a catalyst, wherein the catalyst includes a metal component represented by the following Chemical Formula 1:

Co.sub.x:[M1,Zr].sub.y: M2.sub.z[Chemical Formula 1] wherein Co represents cobalt or oxides or derivatives thereof, M1 represents at least one metal, or oxides or derivatives thereof, selected from Al, Ca, Si, Ti, and Mg, Zr represents zirconium, or oxides or derivatives thereof, M2 represents at least one metal, or oxides or derivatives thereof, selected from W, V, Mn, and Mo, x/y satisfies 0.2x/y2.6, and x/z satisfies 6x/z13.

There is disclosed a highly efficient and economical catalyst for carbon monoxide (CO) oxidation at low temperatures, using a non-noble transition metal composition of copper oxide (CuO), cerium oxide (CeO.sub.2), and niobium oxide (Nb.sub.2O.sub.5). The catalyst, designated as 10CuCeNb, is synthesized via the wet impregnation method and is composed of with 10% CuOCeO.sub.2 supported on Nb.sub.2O.sub.5. It shows a significantly improved performance with full CO conversion achieved at relatively low temperature of 150 C. It demonstrates high stability over a 12-hour reaction time. The activation energy (Ea) is 23.1 kJ mol.sup.1, supporting low-temperature CO oxidation with minimal energy input. The catalyst's high activity and stability are attributed to the formation of oxygen vacancies and active Lewis acid sites generated from the synergistic interaction between CuO, CeO.sub.2, and Nb.sub.2O.sub.5. This catalyst offers a cost-effective alternative to noble metal catalysts for use in catalytic converters, effectively reducing CO emissions in industrial and environmental applications.

Provided is a water electrolysis catalyst with a core-shell structure, which has a vanadium-doped cobalt nitride (VCo.sub.4N) core; and a cobalt-nickel phosphate (CoNiPO.sub.x, x is a natural number) shell.

A method for synthesizing functionalized porous cerium oxide nanoparticles and the resulting nanoparticles. The method involves preparing a synthesis mixture comprising a cerium source, two other metal sources, and an organic acid serving as a fuel. Volatile components are removed from the mixture, which is then subjected to thermal treatment in a static oven. The resulting nanoparticles have a three-dimensional structure with micropores and mesopores, oxygen-defects sites, 10 wt % of transition elements, and 1 wt % of tri-valent cations. The nanoparticles exhibit high photocatalytic activity and adsorption efficiency, and can be coated on a stainless steel substrate. The nanoparticles can be used for photocatalytic reactions, selective reduction and oxidation reactions, adsorption of specific compounds, and removal of toxic compounds from the air. The nanoparticles are coated on a chimney and allows for reduced hydrocarbons, carbon dioxide and carbon monoxide.

A perovskite compound having a cubic perovskite structure, high catalytic activity in oxygen reduction and evolution reactions, and excellent durability is provided. The perovskite compound is represented by the following Chemical Formula 1:
(A.sub.aA.sub.1-a).sub.(B.sub.bB.sub.1-b).sub.O.sub.3-(Chemical Formula 1) in Chemical Formula 1 A is Ba, A is one or more selected from the group consisting of lanthanoid elements, Ag, Ca, and Sr, B is Co. B is one or more selected from the group consisting of Ta, Nb, V, Sc, Y, Mo, W, Zr, Hf, and Ce, a is a real number greater than 0.9 and 1 or less, b is a real number greater than 0.5 and less than 0.9. and real numbers of 0.9 to 1.1. The perovskite compound can be used as a catalyst of electrochemical devices, particularly as a fuel cell catalyst.

The present invention relates to a bundle-type carbon nanotube which has a bulk density of 25 to 45 kg/m.sup.3, a ratio of the bulk density to a production yield of 1 to 3, and a ratio of a tap density to the bulk density of 1.3 to 2.0, and a method for preparing the same.

The present disclosure relates to a method for preparing green methanol, green ethylene glycol and carbon reduction PET. The method comprises the following steps: collecting and purifying a byproduct high-concentration carbon dioxide gas stream in a petroleum refining process into high-purity carbon dioxide, and then carrying out hydrogenation reaction in two-stage fixed bed reactors in sequence to prepare green methanol, the first-stage fixed bed reactor comprises at least two reaction towers arranged in parallel and filled with copper-zinc-calcium-magnesium-aluminum hydrogenation catalysts, and the second-stage fixed bed reactor comprises at least one reaction tower filled with copper-zirconium-titanium-vanadium deposition hydrogenation catalyst. The green methanol can be prepared into ethylene glycol through an MTO process, ethylene oxidation and ethylene oxide hydrolysis. A carbon reduction PET can be prepared through esterification reaction and polymerization reaction. In the esterification and polymerization processes, specific esterification catalysts and composite stabilizers are added to improve the performance.