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.

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 catalyst regeneration method is suitable for a fluidized catalytic cracking unit having a catalytic cracking reactor and a catalyst regenerator. The regeneration method has the following steps: 1) providing a gaseous biomass-derived fuel containing hydrogen and/or methane; 2) directly feeding the gaseous fuel into the catalyst regenerator without separation and purification; 3) introducing an oxygen-containing gas into the catalyst regenerator; and 4) feeding the catalyst to be regenerated from the catalytic cracking reactor into the catalyst regenerator, where it contacts the gaseous fuel and the oxygen-containing gas for coke-burning and regeneration. The method introduces a gaseous biomass-derived fuel as energy supply in the catalyst regeneration process to replace fossil fuels, fundamentally changing the energy source of the catalytic cracking unit, significantly reducing the carbon emissions of the catalytic cracking unit, realizing the recycling of carbon elements, and supplying energy to other process units.

An ammonia oxidation catalyst device, including a substrate, a first catalyst coat layer and a second catalyst coat layer, wherein: the first catalyst coat layer includes inorganic oxide particles and a catalytic noble metal supported on the inorganic oxide particles; the second catalyst coat layer includes an NO.sub.x selective reduction catalyst and a proton zeolite H-Zeolite; the first catalyst coat layer is present on the substrate; and the second catalyst coat layer is present on the first catalyst coat layer.

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.

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.

A solid heat carrier catalyst for thermal desorption of organic matter-contaminated soil and a method for preparing the same. A hollow alumina ball prepared by 3D printing is taken as a solid heat carrier, copper-nickel-vanadium composite oxide is taken as a catalytic active component, and vinyltriethoxysilane is taken as a masking agent. The ball has a diameter of 30 mm to 60 mm and a thickness of 1 mm to 2 mm. An outer surface of the ball is masked with the vinyltriethoxysilane; then the ball is pierced to make an inner surface thereof connected with the outside through channels; the ball is then immersed in a catalytic active component precursor solution; and finally, drying and calcination are performed to obtain the solid heat carrier catalyst for thermal desorption of organic matter-contaminated soil. This product is widely applicable to the field of thermal desorption of organic contaminants of soil.