Patents by Inventor Yoon K. Sin

Yoon K. Sin has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Nonmetallic catalyst compositions for oxidation of ammonia and process for making the catalyst
    Patent number: 4419274
    Abstract: Nonmetallic catalyst compositions for oxidation of ammonia have the formula of Fe.sub.2 O.sub.3 -MAl.sub.2 O.sub.4 -Bi.sub.2 O.sub.3 -Ce.sub.2 O.sub.3. Herein, M represents Mg, Mn, Ca, Sr or Ba. MAl.sub.2 O.sub.4 is a spinel and has a role of carrier as well as that of assistant catalyst. Fe.sub.2 O.sub.3 acts as main catalyst, Bi.sub.2 O.sub.3 as assistant catalyst and Ce.sub.2 O.sub.3 as stabilizer to extend the effective temperature range of the function of catalyst compositions. In the formula, the ratio of each component is as follows:Fe.sub.2 O.sub.3 : 10-40 wt % of spinelBi.sub.2 O.sub.3 : 3.5-6 wt % of spinelCe.sub.2 O.sub.3 : 0.5-2 wt % of spinel.
    Type: Grant
    Filed: December 15, 1981
    Date of Patent: December 6, 1983
    Assignee: Pohang Iron & Steel Co., Ltd.
    Inventors: Yoon K. Sin, Daiuk Kim