CATALYST FOR AMMOXIDATION IN FLUIDISED CATALYST BED AND METHOD OF PRODUCING ACRYLONITRILE Russian patent published in 2019 - IPC B01J23/887 B01J35/00 C07C253/26 

FIELD: chemistry.

SUBSTANCE: present invention relates to a catalyst for ammoxidation in a fluidised bed of a catalyst, a method for production thereof and a method of producing acrylonitrile using a catalyst for ammoxidation in a fluidised catalyst bed. Catalyst contains: silicon dioxide; and metal oxide, where composite formed from silicon dioxide and metal oxide, is represented by formula (1) given below: Mo₁₂Bi_aFe_bNi_cCo_dCe_eCr_fX_gO_h/(SiO₂)_A (1), where Mo is molybdenum, Bi is bismuth, Fe is iron, Ni is nickel, Co is cobalt, Ce is cerium, Cr is chromium, X is at least one element selected from a group consisting of potassium, rubidium and cesium, SiO₂ is silicon dioxide, each of a, b, c, d, e, f, g and h is the atomic fraction of each element and satisfies inequalities of 0.1 ≤ a ≤ 1, 1 ≤ b ≤ 3, 1 ≤ c ≤ 6.5, 1 ≤ d ≤ 6.5, 0.2 ≤e ≤ 1.2, f ≤ 0.05 and 0.05 ≤ g ≤ 1 provided that h is the atomic fraction of the oxygen atom, wherein the atomic fraction satisfies the valences of the elements contained in the composition, with elimination of silicon dioxide, A is silicon dioxide (wt. %) content in composite and satisfies inequality 35 ≤ A ≤ 48, and values α, β and γ, calculated based on atomic fractions of corresponding elements using expressions (2), (3) and (4) given below, satisfy inequalities 0.03 ≤ α ≤ 0.08, 0.2 ≤ β ≤ 0.4 and 0.5 ≤ γ ≤ 2: α= 1.5a/(1.5 (b + f) + c + d) (2); β= 1.5 (b + f) / (c + d) (3); and γ= d/c (4), wherein catalyst is characterized by apparent specific density in range from 0.85 to 1.15 g/cm³. Production method includes: a first step, comprising obtaining a suspension of starting materials; a second step, comprising obtaining dried particles by spray-drying a suspension of starting materials; and a third step consisting in calcining the dried particles. As initial material for silicon dioxide at first stage is used silic acid sol, which demonstrates average particle diameter for primary particles ranging from 5 nm and more to less than 50 nm and detects root-mean-square deviation of less than 30 %, based on average particle diameter in particle size distribution for primary particles.

EFFECT: catalyst exhibits excellent practicality/manufacturability characteristics in terms of operational characteristics of service life, shape and strength.

5 cl, 2 tbl, 18 ex