Nickel diatomaceous earth catalyst and method for producing the same

Abstract

A nickel diatomaceous earth catalyst having a weight loss rate measured by hydrogen-TG at 400 to 600° C. of 0.05 to 2.0%.

1 . A nickel diatomaceous earth catalyst having a weight loss rate measured by hydrogen-TG at 400 to 600° C. of 0.05 to 2.0%. 
     
     
         2 . The nickel diatomaceous earth catalyst according to  claim 1 , wherein a nickel crystallite diameter is 30 to 100 Å. 
     
     
         3 . The nickel diatomaceous earth catalyst according to  claim 1 , wherein a change A in the nickel crystallite diameter between before and after a heat resistance test is 210 Å or less. 
     
     
         4 . The nickel diatomaceous earth catalyst according to  claim 1 , wherein the nickel diatomaceous earth catalyst has a specific surface area of 60 to 180 m 2 /g. 
     
     
         5 . A method for producing a nickel diatomaceous earth catalyst by a precipitation method, comprising:
 adding an alkaline solution as a precipitant to a dispersion liquid in which diatomaceous earth and a salt of a nickel catalyst are mixed; and   performing a drying treatment, a calcination treatment, and a reduction treatment, in this order, to obtain the nickel diatomaceous earth catalyst,   wherein the reduction treatment is performed at a peak temperature +40° C. or more of a hydrogen-TPR measurement on a calcined powder produced by the calcination treatment.   
     
     
         6 . The method for producing a nickel diatomaceous earth catalyst according to  claim 5 , wherein the reduction treatment is performed at the peak temperature +200° C. or less of the hydrogen-TPR measurement on the calcined powder produced by the calcination treatment. 
     
     
         7 . A nickel diatomaceous earth catalyst produced by the method according to  claim 5 . 
     
     
         8 . A method for producing xylylenediamine, the method comprising hydrogenating phthalonitrile in an ammonia solvent in the presence of the nickel diatomaceous earth catalyst according to  claim 1 .