# US 8,772,551 B2 · Mixed oxide catalysts for catalytic gas phase oxidation > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,772,551 B2 - Document ID: US8772551B2 - Status: Granted - Kind: B2 - Application number: 13/177,093 - Filed: 2011-07-06 - Published: 2011-10-27 - Granted: 2014-07-08 - Earliest claimed: 2006-10-20 - Assignees: Evonik Degussa GmbH - Applicants: Achim Fischer; Weimin Lu; Christoph Weckbecker; Klaus Huthmacher - Inventors: Achim Fischer; Weimin Lu; Christoph Weckbecker; Klaus Huthmacher - Web page: https://patentgrep.com/patent/US8772551B2 ## CPC - B01J 23/002: {Mixed oxides other than spinels, e.g. perovskite} - B01J 23/28: Molybdenum - B01J 27/0576: {Tellurium; Compounds thereof} - B01J 27/19: Molybdenum - C07C 45/33: of CHx-moieties - C07C 45/34: in unsaturated compounds - C07C 45/35: in propene or isobutene - C07C 51/215: of saturated hydrocarbyl groups - C07C 51/252: {of propene, butenes, acrolein or methacrolein} - B01J 23/24: Chromium, molybdenum or tungsten - B01J 23/652: Chromium, molybdenum or tungsten - B01J 23/887: containing in addition other metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36 - B01J 37/0045: {Drying a slurry, e.g. spray drying} - B01J 37/0236: {Drying, e.g. preparing a suspension, adding a soluble salt and drying} - B01J 2523/00: Constitutive chemical elements of heterogeneous catalysts - B01J: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS - C07C: ACYCLIC OR CARBOCYCLIC COMPOUNDS ## Abstract Disclosed herein are mixed oxide catalysts for the catalytic gas phase oxidation of alkanes, or mixtures of alkanes and olefins, for the production of aldehydes and carboxylic acids with air or oxygen in the presence of inert gases at elevated temperatures and pressure, and a method for the production of catalysts. ## Claims ### Claim 1 A mixed oxide catalyst of the formula (MoAaBbCcDdEeFfGg)Ox (I) in which: A: bismuth, B: at least one of the elements comprising nickel and/or cobalt, C: at least one of the elements comprising Fe, Ce, Mn, Cr, V, D: at least one of the elements comprising W, P, E: at least one of the elements comprising Li, K, Na, Rb, Cs, Mg, Ca, Ba, Sr, F: at least one of the elements comprising Zn, Nb, Se, Te, Sm, Gd, Y, Pd, Pt, Ru, Ag, Au, G: at least one of the elements comprising Si, Al, Ti, Zr and a=0 b=0-0.1 c=0.005-0.1 d=0.01-0.1 e=0-1 f=0.01-0.8 g=0-800, x=number which is determined by the valency and frequency of the elements other than oxygen. ### Claim 2 (depends on 1) Mixed oxide catalyst according to claim 1, wherein the pulverulent mixed oxide catalyst has been applied to inert support materials or is extruded as a bulk material. ### Claim 3 (depends on 1) Process for preparing the mixed oxide catalyst of claim 1 comprising: mixing solutions of compounds of the elements present in the mixed oxide catalyst of the formula I, preparing coprecipitates thereof, and resulting pulverulent solid is isolated, dried, treated thermally and optionally shaped. ### Claim 4 (depends on 3) Process according to claim 3, wherein pH during preparation of the coprecipitate(s) is <8. ### Claim 5 (depends on 3) Process according to claim 3, wherein compounds of the elements present in the catalyst of the formula (I) are selected from the group consisting of ammonium or amine compounds, oxalates, carbonates, phosphates, acetates, carbonyls, hydroxides, oxides or nitrates, and mixtures thereof, are used. ### Claim 6 (depends on 3) Process according to claim 3, wherein carbonates, hydroxides, oxides, nitrates phosphates and mixtures of these salts are used. ### Claim 7 (depends on 3) Process according to claim 3, wherein anions of acids corresponding to the salts are used. ### Claim 8 (depends on 3) Process according to claim 3, wherein ammonium carbonate, ammonium heptamolybdate and at least one metal nitrate including chromium(III) nitrate, bismuth nitrate, cobalt nitrate; and/or nitric acid are used to prepare the coprecipitate. ### Claim 9 (depends on 3) Process according to claim 3, precipitation is performed at temperatures of 5 to 90° C. ### Claim 10 (depends on 9) Process according to claim 9, wherein precipitation is performed at temperatures of 20 to 90° C. ### Claim 11 (depends on 3) Process according to claim 3, wherein a suspension is obtained by precipitation is matured for >0 to 24 hours. ### Claim 12 (depends on 3) Process according to claim 3, wherein the coprecipitate is removed and dried. ### Claim 13 (depends on 3) Process according to claim 3, wherein dried coprecipitate, before the calcination, consists of spray-dried particles having a particle size distribution of 15 to 160 μm. ### Claim 14 (depends on 13) Process according to claim 13, the dried coprecipitate has a mean particle size distribution of between 15 μm and 80 μm. ### Claim 15 (depends on 13) Process according to claim 13, wherein residence time of dried powder in a thermal treatment oven is between 0.25 and 13 hours, in the course of which temperatures of >150 to 700° C. are established. ### Claim 16 (depends on 3) Process according to claim 3, wherein the thermal treatment is performed in one or more stages. ### Claim 17 (depends on 15) Process according to claim 15, wherein the thermal treatment is performed in an atmosphere composed of inert gas, composed of mixtures of oxygen with an inert gas and/or in the presence or absence of steam. ### Claim 18 (depends on 3) Process according to claim 3, wherein thermally treated powder is shaped by tabletting, extrusion, or applied to a support. ### Claim 19 (depends on 3) Process according to claim 3, wherein, after the catalyst in the form of a powder has been shaped, shaped body thus obtained is heat-treated within a temperature range of 450 to 650° C. ### Claim 20 (depends on 1) Mixed oxide catalyst according to claim 1, wherein (i) C is Cr, (ii) F is Te, or (iii) C is Cr and F is Te. ### Claim 21 (depends on 1) Process for preparing the mixed oxide catalyst of claim 1 comprising: mixing solutions of compounds of the e elements present in the mixed oxide catalyst of the formula I, preparing coprecipitates thereof, and resulting pulverulent solid is isolated, dried, treated thermally and optionally shaped. ### Claim 22 (depends on 20) Process for preparing the mixed oxide catalyst of claim 20 comprising: mixing solutions of compounds of the e elements present in the mixed oxide catalyst of the formula I, preparing coprecipitates thereof, and resulting pulverulent solid is isolated, dried, treated thermally and optionally shaped. ### Claim 23 A mixed oxide catalyst of the formula (MoAaBbCcDdEeFfGg)Ox (I) in which: A: bismuth, B: at least one of the elements comprising nickel and/or cobalt, C: Cr D: P, E: at least one of the elements comprising Li, K, Na, Rb, Cs, Mg, Ca, Ba, Sr, F: Te, G: at least one of the elements comprising Si, Al, Ti, Zr, and a=0 b=0-0.1 c=0.005-0.1 d=0.01-0.1 e=0-1 f=0.01-0.8 g=0-800, x=number which is determined by the valency and frequency of the elements other than oxygen. ### Claim 24 (depends on 23) The mixed oxide catalyst of claim 23 having the formula (MoCcDdFf)Ox. ### Claim 25 (depends on 23) The mixed oxide catalyst of claim 23, wherein the atomic ratio of C to Mo is 0.0286, the atomic ratio of D to Mo is 0.05, and the atomic ratio of F to Mo is 0.05. ### Claim 26 (depends on 24) The mixed oxide catalyst of claim 24, wherein the atomic ratio of C to Mo is 0.0286, the atomic ratio of D to Mo is 0.05, and the atomic ratio of F to Mo is 0.05.