Method for treating ammonia-containing gases
Patent 4003978 Issued on January 18, 1977. Estimated Expiration Date: 
January 18, 1994. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
January 18, 1994. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 1558598 1918038 3467491 3511596 InventorsAssigneeApplicationNo. 515888 filed on 10/18/1974US Classes:423/237, Ammonia423/239.1, Utilizing solid sorbent, catalyst, or reactant423/351, NITROGEN OR COMPOUND THEREOF (EXCEPT AMMONIUM SALT OF NON-NITROGEN ACID)502/204, And Group VI metal containing (i.e., Cr, Mo, W or Po)502/256, Chromium502/257, And Group VIII metal containing (i.e., iron or platinum group)502/304, Cerium502/307, Zinc502/308, And Group IV metal containing (i.e., Ti, Zr, Hf, Ge, Sn or Pb)502/309, Titanium containing502/310, Tin containing502/312, Vanadium containing502/313, And Group VIII metal containing (i.e., iron or platinum group)502/314, Iron group metal and Group III metal containing (i.e., Fe, Co or Ni and Sc, Y, Al, Ga, In or Tl)502/315, Nickel containing502/317, And Group I containing (i.e., alkali, Ag, Au or Cu)502/319, Of chromium502/320, And Group III metal containing (i.e., Sc, Y, Al, Ga, In or Tl)502/321Of molybdenumExaminersPrimary: Rutledge, L. DewayneAssistant: Lewis, Michael Attorney, Agent or FirmForeign Application Priority Data1973-10-24 JAAbstractA method for treating ammonia-containing gases for removing ammonia therefrom, which comprises contacting the ammonia-containing gases with a metal oxide catalyst having the following formula:wherein Cr is chromium; A is at least one element selected from the group consisting of tin, antimony, vanadium, cobalt, silver, zinc, nickel, titanium, molybdenum, tungsten, sulfur, phosphorus, boron, germanium and zirconium; x is a numeral of 4 to 12; y is a numeral of 0.2 to 8 and z is a numeral of 6.2 to 42, in a vapor phase at a temperature of from 200° to 500° C in the presence of molecular oxygen, and thereby the ammonia is oxidized to harmless nitrogen gas. |
| ||||||||||||||
