Phosphorus-modified nickel-based catalyst for preparing high-carbon hydrocarbon by photothermal catalytic carbon monoxide hydrogenation as well as preparation method and application thereof
A nickel-based catalyst, carbon monoxide technology, applied in the direction of carbon compound catalysts, hydrocarbon production from carbon oxides, physical/chemical process catalysts, etc., can solve the problems of energy and efficiency waste, catalyst deactivation, etc., to improve selectivity, prepare The effect of simplicity and simple process
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Embodiment 1
[0047] The invention relates to a preparation method of phosphorus modified nickel based catalyst for photothermal catalytic hydrogenation of carbon monoxide to prepare high carbon hydrocarbons, which comprises the following steps:
[0048] 1) Prepare mixed metal salt solution: dissolve 0.04 mol of nickel chloride hexahydrate and 0.02 mol of titanium dioxide in 200 ml of deionized water, fully dissolve in 0.1 mol of urea added with precipitant, then transfer to a 250 ml three neck flask, and finally react at 100 ℃ for 10 hours.
[0049] 2) After the reaction is completed, the precursor material can be obtained by centrifuging and washing with deionized water for 3 times and drying in an oven at 60 ℃ for 12h.
[0050] 3) The precursor material obtained above is in hydrogen argon mixture (10% H 2 In the atmosphere at 5 ℃ / min -1 The heating rate is increased to 500 ℃, maintained at this temperature for 5h, and then switched to n 2 Atmosphere, naturally cool to room temperature.
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Embodiment 2、3
[0059] Test the effect of phosphating temperature on the performance of phosphorus modified nickel based catalyst, that is, the preparation method is the same as that in example 1. The only difference is that the temperature reached by the temperature rise of the material in step 4) is changed, and the obtained product is subjected to photocatalytic Fischer Tropsch reaction. The reaction steps are the same as that in example 1. The results are shown in Table 2:
[0060] Table 2 catalytic results of different phosphorus modified nickel based catalysts
[0061] Example number Temperature (℃) Conversion rate of CO CH 4 Selectivity
[0062] The above results show that the invention adopts light driven Fischer Tropsch reaction, has relatively high conversion rate of CO, and realizes the purpose of highly selective preparation of high carbon hydrocarbons. Compared with the thermal catalytic Fischer Tropsch reaction under traditional high temperature and high pressure system,...
Embodiment 4、5
[0093]The effect of the molar ratio of nickel salt and titanium dioxide on the performance of nickel based catalyst is tested, that is, the preparation method is the same as that in example 1. The only difference is that the molar concentration ratio of nickel salt and titanium dioxide in step 1) is changed, and the obtained product is subjected to photo catalytic Fischer Tropsch reaction. The reaction steps are the same as that in example 1. The results are shown in Table 5:
[0094] Table 5 catalytic results of different phosphorus modified nickel based catalysts
[0095] Example number molar concentration ratio Conversion rate of CO CH 4 Selectivity
[0096] The results show that when Ni: TiO 2 = 2:1, the conversion rate of CO and the selectivity of high carbon hydrocarbons are the best.
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