Catalyst composition for preparing ethylene glycol from biomass raw materials as well as preparation method and application of catalyst composition
A technology of biomass raw materials and catalysts, applied in physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, etc., can solve the problems of non-renewable and limited storage of fossil resources, etc. Achieve the effects of accelerated transformation, high hydrothermal stability, and broad application prospects
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Embodiment 1
[0043] 40%Ni-SiO 2 The catalyst was prepared by precipitation method: 39.635g of nickel nitrate hexahydrate was dissolved in deionized water to prepare a 1mol / L nickel nitrate solution, and 4mol / L NaOH solution was added dropwise under vigorous stirring for precipitation. After pH>11, 30g of 40 % silica sol to form a gel, then heated to 100°C for aging for 4 hours, filtered and washed until the filtrate was neutral. Dry overnight at 120°C, bake at 500°C for 4 hours in an air atmosphere, and finally use H at 400°C 2 / N 2 (volume ratio of 20 / 80) reduction for 6h.
[0044] Nb-containing tungsten bronze Nb x WO 3 (Denoted as NbW-1) The catalyst preparation process is as follows: the required precursor niobium salt and tungsten salt (by atomic molar ratio) are 0.3:1, and 3.228g niobium oxalate, 5.392g ammonium metatungstate and 3.782g Dissolve oxalic acid dihydrate in 80ml of water, heat and dissolve at 60°C for 0.5h under stirring, then raise the temperature to 150°C, continu...
Embodiment 2
[0048] 40%Ni-SiO 2 Catalyst preparation method is the same as embodiment 1.
[0049] Nb-containing tungsten bronze Nb x WO 3 (denoted as NbW-2) catalyst preparation process is as follows: wherein the required precursor niobium salt and tungsten salt (by atomic molar ratio) is 0.3:1, weigh 3.228g niobium oxalate, 5.392g ammonium metatungstate and 6.304g Dissolve citric acid monohydrate in 80ml of water, heat and dissolve at 60°C for 0.5h under stirring, then raise the temperature to 150°C, keep stirring and reflux at a constant temperature for 48h, after cooling, the formed precipitate is filtered, washed with water until neutral, and dissolved at 120°C After drying at ℃ for 12 hours, finally in H 2 / N 2 NbW-2 was prepared by calcining at 400℃ for 2h under (60 / 40) atmosphere, and the actual value of Nb:W molar ratio in NbW-2 was 0.36 as measured by ICP.
[0050] The reaction of cellulose catalytic conversion to prepare ethylene glycol is carried out in a closed reactor. W...
Embodiment 3
[0052] 40%Ni-SiO 2 Catalyst preparation method is the same as embodiment 1.
[0053] Nb-containing tungsten bronze Nb x WO 3 (Denoted as NbW-3) The preparation process of the catalyst is as follows: the required precursor niobium salt and tungsten salt (by atomic molar ratio) are 0.3:1, and 3.228g niobium oxalate, 5.392g ammonium metatungstate and 4.503g Dissolve tartaric acid in 80ml of water, heat and dissolve at 60°C for 0.5h under stirring, then raise the temperature to 150°C, continue to keep stirring at a constant temperature and reflux for 48h, after cooling, the resulting precipitate is filtered, washed with water until neutral, and dried at 120°C After 12 hours, finally in H 2 / N 2 NbW-3 was prepared by calcining at 400℃ for 2h under (60 / 40) atmosphere, and the actual value of Nb:W molar ratio in NbW-3 was 0.34 as determined by ICP.
[0054] The reaction of cellulose catalytic conversion to prepare ethylene glycol is carried out in a closed reactor. Weigh 1.0g m...
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