公开(公告)号：JP2000072431A

公开(公告)日：2000-03-07

申请号：JP26393998

申请日：1998-09-01

Applicant: AGENCY IND SCIENCE TECHN

Inventor： CHIN RAIGEN ,  HORIUCHI TATSURO ,  OZAKI TOSHIHIKO ,  SUGIYAMA TOYOHIKO ,  SUZUKI KENJI ,  MORI TOSHIAKI

IPC: B01J35/10 ,  B01J21/08 ,  B01J32/00 ,  C01B33/12 ,  C01B37/02

Abstract: PROBLEM TO BE SOLVED: To obtain an inorg. mesoporous material having superior heat resistance by bringing a mixture of silica, a template agent and an alkali into hydrothermal synthesis, discharging the reaction soln. during the synthesis, adding distilled water and carrying out the synthesis again. SOLUTION: Fumed silica, a template agent, an alkali and distilled water are mixed in a molar ratio of 1:0.25:0.2:35 and the mixture is agitated at 70 deg.C for 2 hr, aged for 24 hr at room temp., poured into an autoclave and held for 24 hr at 120-165 deg.C. Contents are drawn out from the autoclave and filtered to obtain a solid. Distilled water is added to the solid by 30 ml and this mixture is held again in the autoclave at 120-165 deg.C for 24 hr. Then, the contents are drawn out and filtered to obtain a solid and this solid is washed 5 times with distilled water, dried at room temp., heated to 550 deg.C at 1 deg.C/min rate and held for 9 hr to thermally decompose the org. substance.

公开(公告)号：JP2000262902A

公开(公告)日：2000-09-26

申请号：JP7752499

申请日：1999-03-23

Applicant: AGENCY IND SCIENCE TECHN

Inventor： CHIN RAIGEN ,  HORIUCHI TATSURO ,  MORI TOSHIAKI

IPC: B01D53/94 ,  B01J23/84 ,  B01J23/889 ,  F01N3/10 ,  F01N3/28

Abstract: PROBLEM TO BE SOLVED: To provide a catalyst which can decompose and remove nitrogen oxides in a wide temp. range from 200 to 500 deg.C included in a waste gas discharged form a factory, power plant or the like or in an exhaust gas from an automobile engine such as a lean-burn engine, and to provide a method to remove nitrogen oxides from an exhaust gas by using this catalyst. SOLUTION: This catalyst to remove nitrogen oxides is prepared by supporting manganese oxide (Mn2O3) by 3 to 50 wt.% on a spinel crystalline double oxide containing nickel (Ni) and gallium (Ga). The catalyst to remove nitrogen oxides is brought into contact with an exhaust gas containing nitrogen oxides, and if necessary a reducing agent is used to decompose NO in the exhaust gas.