Patent ID: 7754139

Claim:
A process for preparing triethylenediamine (TEDA) by reaction of ethylenediamine (EDA) and/or piperazine (PIP) in the presence of a crystalline aluminosilicate catalyst, wherein a shaped body whose cutting hardness has been increased beforehand using a method of increasing the cutting hardness of a shaped body comprising a crystalline aluminosilicate having an SiO 2 /Al 2 O 3 molar ratio of 10:1 to 1200:1, wherein the shaped body comprises a binder selected from among oxides of silicon and/or zirconium and is treated with a gas consisting of water vapor at from 100 to 600° C. and an absolute pressure of from 0.1 to 10 bar for a period of at least 20 hours and the shaped body has been calcined at from 100 to 600° C. before the treatment with water vapor is used as the catalyst.