Effect of ball-milling time on the performance of Ni-Al2O3 catalyst for 1,4-butynediol hydrogenation to produce 1,4-butenediol
2020, 22 (1):
Ni-Al2O3 catalyst was prepared by mechanochemical method in combination with planetary ball-milling machine. Effect of milling time on the crystal structure, reduction characteristics and catalytic hydrogenation performance of Ni-Al2O3 catalyst for 1,4-Butynediol to produce 1,4-butanediol were investigated. The catalysts were characterized by PSD, EDX, XRD, H2-TPR, BET, TEM, NH3-TPD methods. Results showed that the MCt2.5 catalyst at the ball milling time of 2.5 h performed the smallest particle size of 191.0 nm. Evaluation experiment investigated that the activity of the prepared catalyst increased firstly and then up to the constant value with the extension of ball-milling time. The BYD conversion, BED selectivity and yield of the MCt2.5 catalyst were up to 35.63%, 33.48% and 32.46%, respectively, higher than others. The excellent performance of MCt2.5 sample is mainly related to the following three reasons from characterization results. Firstly, it is of the smallest particle size of 191.0 nm; and then, the surface acid (strong acid) of the catalyst was weaker than other catalysts; the last, the loading amount (23.84 wt.%) of the active component Ni exceeded the theoretical value (20 wt.%).