Preparation method of pure M1-phase MoVTeNbOx catalyst with high specific surface area
A technology of high specific surface area and catalyst, applied in the field of catalysis, can solve the problems of restricting catalytic activity, small specific surface area of catalyst, and a certain distance in the production capacity of catalyst with space-time yield, and achieve low price, excellent catalytic activity and high space-time yield Effect
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[0036] The invention provides a method for preparing a pure M1 phase MoVTeNbOx catalyst with a high specific surface area, comprising the following steps:
[0037] S1) Mix and dissolve the molybdenum-containing compound, the vanadium-containing compound, the tellurium-containing compound, the niobium-containing compound and the protective agent to obtain a precursor-protective agent mixed solution;
[0038] The protective agent is a surfactant or a small molecule organic acid and a salt thereof;
[0039] S2) performing a hydrothermal reaction on the precursor-protecting agent mixed solution, and separating to obtain a solid;
[0040] S3) Calcining the solid in an air atmosphere, then calcining in an inert gas, and then purifying hydrogen oxide to obtain a pure M1 phase MoVTeNbOx catalyst.
[0041] The invention uses molybdenum-containing compounds, vanadium-containing compounds, tellurium-containing compounds and niobium-containing compounds as raw materials to prepare pure M...
Embodiment 1
[0087] According to the molar ratio of Mo, V, Te, Nb and protective agent (sodium citrate) is 1:0.25:0.23:0.12:0.14, under the heating condition of 80 ℃, weigh a certain amount of ammonium niobium oxalate in proportion and dissolve in In deionized water, solution 1 was obtained, and a certain quality of ammonium molybdate, vanadyl sulfate, and telluric acid was also weighed, and dissolved in deionized water to obtain solution 2. The volume ratio of solution 1 and solution 2 was 1:2.5, and solution 1 After cooling with solution 2, mix and stir evenly to obtain the precursor solution, then add 0.05mol / L sodium citrate solution, the volume ratio of the protective agent solution to the precursor solution is 1:6.5, continue to mix and stir evenly; The solution was transferred to a hydrothermal kettle, and heated at 175°C for 48 hours to obtain a purple suspension; the suspension obtained by hydrothermal synthesis was centrifuged and washed, dried overnight at 80°C in a blast drying ...
Embodiment 2
[0094] According to the molar ratio of Mo, V, Te, Nb and protective agent (ammonium citrate) is 1:0.25:0.23:0.12:0.14, under the heating condition of 80 ℃, weigh a certain amount of ammonium niobium oxalate in proportion and dissolve in In deionized water, solution 1 was obtained, and a certain quality of ammonium molybdate, vanadyl sulfate, and telluric acid was also weighed, and dissolved in deionized water to obtain solution 2. The volume ratio of solution 1 and solution 2 was 1:2.5, and solution 1 After cooling with solution 2, mix and stir evenly to obtain a precursor solution. Add 0.05mol / L ammonium citrate protective agent solution to the precursor solution, the volume ratio of the protective agent solution to the precursor solution is 1:8.5, mix and stir evenly, transfer to a hydrothermal kettle, and heat at 175°C for 48h After that, a lavender suspension was obtained; after the suspension was centrifugally washed, it was dried overnight at 80°C in a blast drying oven,...
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