公开(公告)号：US3836436A

公开(公告)日：1974-09-17

申请号：US27593772

申请日：1972-07-28

Applicant: SNAM PROGETTI

Inventor： RIVOLA L ,  MORMINO V ,  NOTARI B

IPC: B01J23/50 ,  B01J37/34 ,  C07D301/10 ,  C25C5/02 ,  C22D5/00 ,  B01K3/00

CPC classification number: C07D301/10 ,  B01J23/50 ,  B01J37/348 ,  C25C5/02 ,  Y02P20/52

Abstract: A process is disclosed whereby a silver containing catalyst is produced, in a particle size ranging from 300 to 1,500 A, through the pulsed electrolysis of a solution of a silver salt (e.g., silver nitrate) in the presence of a complexing agent (e.g., ammonia) wherein current is fed to the solution for spaced periods of a few seconds duration. Advantageously, after about 10-15 cycles of feeding and interrupting the current to the solution, a current inversion lasting from a few seconds is effected. The silver is obtained in the form of a powder which, after washing, can be used directly or supported on a ceramic material as catalyst for the production of ethylene oxide.

Abstract translation: 公开了一种方法，其中通过在络合剂存在下通过脉冲电解银盐（例如硝酸银）溶液，制备粒度范围为300至1,500的含银催化剂（例如， 氨），其中电流被供给溶液，持续时间为几秒。 有利的是，在供给和中断电流到溶液的约10-15个循环之后，进行持续几秒的电流反转。 银以粉末的形式获得，其在洗涤后可直接使用或负载在陶瓷材料上作为生产环氧乙烷的催化剂。

公开(公告)号：US3843491A

公开(公告)日：1974-10-22

申请号：US31906072

申请日：1972-12-27

Applicant: SNAM PROGETTI

Inventor： PIRO M ,  RIVOLA L ,  NOTARI B

IPC: B01J23/50 ,  B01J37/34 ,  C07D301/10 ,  C07D303/04 ,  C25C1/20 ,  C25C5/00 ,  C22D5/00 ,  C22D1/12

CPC classification number: C07D301/10 ,  B01J23/50 ,  B01J37/348 ,  Y02P10/138

Abstract: 1. A PROCESS FOR THE PREPARATION OF SILVER USEFUL AS A CATALYST BY SILVER ELECTROCHEMICAL DEPOSITION COMPRISING: COMPLEXING A SILVER COMPOUND WITH A MEMBER SELECTED FROM THE GROUP CONSISTING OF AMMONIC AND FLUOBORIC IONS, ELECTROLYTICALLY DEPOSITING THE SILVER COMPOUND ON A CATHODE, AND CONCURRENTLY REMOVING THE DEPOSITED SILVER FROM SAID CATHODE WHEREBY THE REMOVED SILVER HAS A SIZE OF LESS THAN 1500 A.