公开(公告)号：US3755550A

公开(公告)日：1973-08-28

申请号：US3755550D

申请日：1971-08-02

Applicant: DU PONT

Inventor： STILES A

IPC: C01B17/04 ,  C01B17/16

CPC classification number: C01B17/0478 ,  C01B17/0486 ,  C01B17/164

Abstract: THIS INVENTION RELATES TO THE INITIAL CATALYTIC REDUCTION OF SULFUR DIOXIDE TO HYDROGEN SULFIDE WITH A REDUCING GAS WHEREIN THE CATALYTIC MATERIAL IS ON A SUPPORT AND THE MATERIAL IS A COMBINATION OF (1) ALKALINE EARTH MOLYBDATES AND (2) A CHROMITE SELECTED FROM THE GROUP OF THE CHROMITES OF COBALT, MANGANESE, COPPER, CERIUM, OR A MIXTURE OF THE RATE EARTHS CONTAINING AT LEAST 30% CERIUM. SPACE VELOCITIES OF AT LEAST 500 UP TO OVER 4000 HR.-1 AT LIGHT-OFF TEMPERATURES OF LESS THAN 540*C. WITH THE GASES REACHING EQUILIBRIUM ARE PRACTICAL.

公开(公告)号：US3794588A

公开(公告)日：1974-02-26

申请号：US3794588D

申请日：1971-09-23

Applicant: DU PONT

Inventor： STILES A

IPC: B01D53/86 ,  B01J23/34 ,  B01J23/66 ,  B01J23/75 ,  B01J23/755 ,  B01J23/80 ,  B01J37/02 ,  B01J37/03 ,  B01J11/06 ,  B01J11/08 ,  B01J11/22

CPC classification number: B01J37/0215 ,  B01D53/8656 ,  B01J23/34 ,  B01J23/66 ,  B01J23/75 ,  B01J23/755 ,  B01J23/80 ,  B01J37/0226 ,  B01J37/03

Abstract: HIGHLY-ACTIVE SUPPORTED CATALYST ARE PREPARED BY SLURRYING A FINELY DIVIDED FORM OF THE CATALYTIC MATERIAL IN A SOLUTION OF THE NITRATE SALT OF THE METAL OF THE CATALYTIC MATERIAL, APPLYING THE SLURRY TO A SUPPORT, PARTICULARLY ONE HAVING A SMOOTH SURFACE, DRYING AND CALCINING. IN A PREFERRED ASPECT, THE SUPPORTED CATALYST ALSO CONTAINS INTERSEPERSANTS TO STABILIZE THE CATALYST FROM CRYSTAL GROWTH AT HIGH TEMPERATURES.

公开(公告)号：US3752774A

公开(公告)日：1973-08-14

申请号：US3752774D

申请日：1971-06-07

Applicant: DU PONT

Inventor： STILES A

IPC: B01J23/83 ,  C07C209/48 ,  B01J11/06

CPC classification number: B01J23/83 ,  C07C209/48

Abstract: THE ACTIVITY OF COBALT, NICKEL OR IRON OXIDE CATALYSTS IS IMPROVED IF THE CATALYST CONTAINS A PROMOTER, 0.110% ZIRCONIA OR 0.1-5% CERIA, AND THE CATALYST IS PREPARED BY BEING PRECIPITATED FROM A SOLUTION HAVING A PH BELOW 7.35. FURTHER IMPROVEMENTS IN ACTIVITY ARE OBTAINED IF THE ZIRCONIA OR CERIA PROMOTED CATALYST ALSO CONTAINS 0.08-1% OF SILICA AS A CO-PROMOTER.

公开(公告)号：US3789019A

公开(公告)日：1974-01-29

申请号：US3789019D

申请日：1971-12-27

Applicant: DU PONT

Inventor： STILES A

IPC: B01D53/50 ,  B01D53/86 ,  B01J23/22 ,  C01B17/79 ,  B01J11/06 ,  B01J11/22

CPC classification number: B01D53/8609 ,  B01D53/50 ,  B01J23/22 ,  C01B17/79

Abstract: THIS INVENTION RELATES TO A PROCESS FOR PREPARING A CATALYTIC MATERIAL HAVING HIGH EFFICENCY IN THE OXIDATING OF SO2 RO SO3 WHICH ENTAILS PREPARING A HOMOGENEOUS MIXTURE COMPRISING A CATALYRICALLY EFFECTIVE AMOUNT OF A PRIMARY CATALYTALYTIC MATERIAL SELECTED FROM THE GROUP OF CSVO3 OR RBVO3, A PROMOTER, AND A CARRIER MATERIAL COMPRISING DIATOMACEOUS EARTH; AND THEN DRYING THE MIXTURE TO PROVIDE THE CATALYST.