A supported catalyst having catalytic species including molybdenum as well as cobalt and/or vanadium as a promoter disposed on a support material containing zeolite modified with titanium dioxide. Various methods of preparing and characterizing the supported catalyst are disclosed. The utilization of the catalyst in treating a hydrocarbon feedstock containing sulfur compounds (e.g. dibenzothiophene) to produce a desulfurized hydrocarbon stream is also provided.

Higher mixed alcohols are produced from syngas contacting a catalyst in a reactor. The catalyst has a first component of molybdenum or tungsten, a second component of vanadium, a third component of iron, cobalt, nickel or palladium and optionally a fourth component of a promoter. The first component forms alcohols, while the vanadium and the third component stimulates carbon chain growth to produce higher alcohols.

A method for manufacturing multi-wall carbon nanotubes, includes the steps of: (a) dissolving a metal precursor in a solvent to prepare a precursor solution; (b) perform thermal decomposition while spraying the precursor solution into a reactor, thereby forming a catalyst powder; and (c) introducing the catalyst powder into a fluidized-bed reactor heated to 600-900° C. and spraying a carbon-based gas and a carrier gas to synthesize multi-wall carbon nanotubes from the catalyst powder, wherein steps (a) to (c) are performed in a continuous type and wherein the catalyst powder contains metal components according to equation 1 below. <Equation 1> Ma:Mb=x:y, wherein Ma represents at least two metals selected from Fe, Ni, Co, Mn, Cr, Mo, V, W, Sn, and Cu; Mb represents at least one metal selected from Mg, Al, Si, and Zr; x and y each represent the molar ratio of Ma and Mb; and x+y=10, 2.0≤x≤7.5, and 2.5≤y≤8.0.

Provided are a method for producing hydrocyanic acid and a device for producing hydrocyanic acid, which can improve a yield of the hydrocyanic acid in a vapor phase contact ammoxidation reaction of methanol. The method for producing hydrocyanic acid includes a step of obtaining hydrocyanic acid by a vapor phase contact ammoxidation reaction by supplying a raw material gas including methanol in a fluidized bed reactor (1) through a raw material gas disperser (7) disposed in the fluidized bed reactor (1) and bringing the methanol into contact with ammonia and oxygen in the presence of a metal oxide catalyst, in which the raw material gas disperser (7) has one or more pores for releasing the raw material gas into the fluidized bed reactor (1), and the number of pores per unit cross-sectional area of the fluidized bed reactor (1) is 10 to 45 pieces/m.sup.2.

A hydroprocessing catalyst or catalyst precursor has been developed. The catalyst is a transition metal molybdotungstate material or metal sulfides derived therefrom. The hydroprocessing using the transition metal molybdotungstate material may include hydrodenitrification, hydrodesulfurization, hydrodemetallation, hydrodesilication, hydrodearomatization, hydroisomerization, hydrotreating, hydrofining, and hydrocracking.

The present invention relates to carbon nanotubes having a pore volume of 0.94 cm.sup.3/g or more, and being an entangled type, a method of manufacturing the same, and a positive electrode for a primary battery which comprises the same.

Higher mixed alcohols are produced from syngas contacting a catalyst in a reactor. The catalyst has a first component of molybdenum or tungsten, a second component of vanadium, a third component of iron, cobalt, nickel or palladium and optionally a fourth component of a promoter. The first component forms alcohols, while the vanadium and the third component stimulates carbon chain growth to produce higher alcohols.

The present invention clarifies the characteristic of the hygroscopicity of the catalyst for producing acrylic acid and finds out a relationship between the water amount of the catalyst and the catalytic performance as the catalyst for producing acrylic acid, and provides an excellent catalyst. Provided is a catalyst for producing acrylic acid, which contains molybdenum and vanadium as essential active components, in which the amount of water contained in the catalyst is 0.01 mass % or more and 0.53 mass % or less.

A supported catalyst having catalytic species including molybdenum as well as cobalt and/or vanadium as a promoter disposed on a support material containing zeolite modified with titanium dioxide. Various methods of preparing and characterizing the supported catalyst are disclosed. The utilization of the catalyst in treating a hydrocarbon feedstock containing sulfur compounds (e.g. dibenzothiophene) to produce a desulfurized hydrocarbon stream is also provided.

Higher mixed alcohols are produced from syngas contacting a catalyst in a reactor. The catalyst has a first component of molybdenum or tungsten, a second component of vanadium, a third component of iron, cobalt, nickel or palladium and optionally a fourth component of a promoter. The first component forms alcohols, while the vanadium and the third component stimulates carbon chain growth to produce higher alcohols.