Patent ID: 9725403
Date: 2017-08-08
CPC Classifications: B01J,C07C

Claim:
1. A method for pretreating a copper-based catalyst comprising dehydrating a copper-based catalyst at an elevated temperature, reducing the dehydrated copper-based catalyst with hydrogen to obtain an activated copper-based catalyst, and passivating the activated copper-based catalyst to obtain a catalyst suitable for N-alkylation by reacting with a sulfur- or halogen-containing compound, wherein the copper-based catalyst comprises about 10% to 70% copper oxide; and concentration of the sulfur- or halogen-containing compound is about 1000 PPM to 10000 PPM for passivation; and the sulfur- or halogen-containing compound is selected from the group consisting of carbon disulfide, chlorophenylamine, 2-mercaptobenzothiazole, thiophene, 2,4-dichloroaniline, and tetramethyl thiuram disulfide.