United States Patent (19) 11) 4411,818 Reuter Et Al
United States Patent (19) 11) 4411,818 Reuter et al. 45) Oct. 25, 1983 (54 REACTIVATION OF 56) References Cited WANADUM-CONTAINING OXIDATION U.S. PATENT DOCUMENTS CATALYSTS 3,474,041 10/1969 Kerr ................................ 252/411 R 75 Inventors: Peter Reuter, Ludwigshafen; Kurt 4,007,136 2/1977 Blechschmitt et al. ............. 252/476 Blechschmitt, Schifferstadt; Friedrich 4,035,399 7/1977 Yokoyama .......................... 549/248 Wirth, Ludwigshafen, all of Fed. 4,036,783 7/1977 Blechschmitt et al. ............. 252/46 Rep. of Germany 4,123,442 10/1978 Bakshi ................................. 252A16 FOREIGN PATENT DOCUMENTS 73) Assignee: BASF Aktiengesellschaft, Fed. Rep. 2436009 2/1976 Fed. Rep. of Germany . of Germany 2510994 9/1976 Fed. Rep. of Germany . 368229 1/1973 U.S.S.R. .............................. 549/248 21 Appl. No.: 348,198 Primary Examiner-P. E. Konopka Attorney, Agent, or Firm-Keil & Witherspoon 22 Filed: Feb. 12, 1982 57 ABSTRACT (30) Foreign Application Priority Data A process for reactivating avanadium-containing oxi Mar. 4, 1981 (DE) Fed. Rep. of Germany ....... 3.08101 dation catalyst, wherein the catalyst is treated first at from 100 to 600' C., with a volatile phosphorus com 51) Int. Cl. ........................ B01J 23/92; B01J 21/20; pound in the presence of an oxygen-containing gas, and B01J 27/28; C07D 307/89 then at from 50 to 600 C. with sulfur trioxide or a 52 U.S.C. ...................................... 502/35; 260/369; mixture of a volatile sulfur compound and an oxygen 549/248; 549/257; 549/258; 549/259; 502/37 containing gas. 58) Field of Search ..................... 252/41 R, 416, 415; 549/248 4 Claims, No Drawings 4,411,818 2 Although German Published Application DAS No.
[Show full text]