Gas phase permeation precipitation method for preparation of supported nanometer nickel hydrogenation catalyst
A nano-nickel hydrogenation catalyst and gas-phase infiltration technology, applied in the direction of catalyst activation/preparation, catalyst carrier, chemical instrument and method, etc., can solve the problems of low nickel content of the catalyst, low catalytic efficiency, sintering deactivation of nano-crystal grains, etc. Achieve the effect of good activity selectivity, simple process and easy control of conditions
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Embodiment 1
[0025] Put 5L nickel carbonyl liquid from the storage tank into the evaporator, weigh 800g gamma alumina strip support (Φ1mm) and put it into the vapor phase infiltration and deposition tower, and then operate according to the above B-E steps. The operating parameters are: the temperature of the evaporator water bath is 35°C; the volume mixing ratio of nickel carbonyl vapor and carrier gas is 1:6, and the carrier gas is 99.9% nitrogen; during gas phase infiltration, the temperature of the material tower is 40°C, and the time is 0.5h; During the pyrolytic deposition, the temperature of the material tower was 90°C, and the time was 0.5h; after the deposition, the firing temperature was controlled at 330°C, and the time was 1h.
[0026] After the experiment, the nickel content of the catalyst was analyzed to be 5.6 wt%, and the size of the nano-nickel was analyzed by a field emission scanning electron microscope to be 25-45nm.
Embodiment 2-5
[0027] Embodiment 2-5, experiment method is the same as embodiment 1, and experiment parameter is shown in Table 1.
[0028] Table 1
[0029]
Embodiment 6
[0031] Catalyst hydrogenation performance evaluation by continuous micro-reflector-chromatography system. The hydrogenated oil sample is a mixture of decahydronaphthalene (60%) and toluene (40%), and the catalyst consumption is 0.1 g. The catalyst was reduced at 200°C for 3h before hydrogenation. The hydrogenation reaction was carried out under normal pressure, the hydrogen flow rate was 180ml / min, the hydrogen-to-oil ratio was 1800:1, the hydrogenation temperature was 130°C, and the chromatographic sampling and analysis were carried out after 3 hours of passing the oil sample. The hydrogenation evaluation results of the catalysts of Examples 1-5 are shown in Table 2.
[0032] Toluene conversion % = (toluene content in oil sample before hydrogenation - toluene content in oil sample after hydrogenation) / toluene content in oil sample before hydrogenation × 100%
[0033] Table 2
[0034]
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