Method for preparing fructose by selective isomerization of glucose
A glucose and fructose technology, which is applied in the preparation of sugar derivatives, chemical instruments and methods, monosaccharides, etc., can solve the problems of unmentioned catalyst stability, difficult separation of catalyst and product, and poisonous phenolic compounds, so as to improve production High rate, low generation cost, easy to obtain effect
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Embodiment 1
[0032] Take an appropriate amount of ammonium molybdate in a quartz reaction tube, and in an oxygen atmosphere of 60ml / min, raise the temperature from room temperature to 550°C at a rate of 5°C / min, then keep it warm for 2 hours, and then naturally cool down to room temperature to prepare molybdenum oxide catalyst.
Embodiment 2
[0034] Preparation of Mo / AC catalyst by impregnation method: according to the Mo load in Mo / AC catalyst, weigh a certain amount of ammonium molybdate, dissolve it in a certain volume of deionized water, and then add a certain amount of 60-100 mesh coconut shell activated carbon, After stirring overnight, the water was evaporated to dryness to obtain a solid. The solid was heated up to 500°C at a rate of 5°C / min in a nitrogen atmosphere, and calcined for 2 hours to obtain the Mo / AC catalyst. The amount of ammonium molybdate and activated carbon used to prepare Mo / AC catalysts with different Mo loadings is shown in the table below.
[0035] Select 60-100 mesh activated carbon, because of its large particle size, it is easy to separate and recover from the reaction solution.
[0036] Table 1 Mo / AC catalyst raw material usage with different Mo loadings
[0037] Mo load / wt%
Embodiment 3
[0039] Take the H-Beta molecular sieve raw material, raise it from room temperature to 500 °C at a rate of 5 °C / min in an oxygen atmosphere of 60 mL / min, keep it warm for 2 hours, and then cool it down to room temperature naturally to obtain the H-Beta molecular sieve catalyst.
[0040] Molybdenum / β catalyst is to calculate the required mass of ammonium molybdate according to different molybdenum-aluminum ratios, then dissolve ammonium molybdate with 50ml of pure water, then calculate the mass of β molecular sieve according to different molybdenum-aluminum ratios, and add a certain amount of molecular sieve , stirred together at room temperature for 24 hours, then evaporated to dryness at 40°C, then dried the evaporated catalyst in an oven at 105°C overnight, and then dried the dried catalyst under 60ml / min of oxygen, and at room temperature Molybdenum / β catalysts with different molybdenum-aluminum ratios were prepared by raising the temperature to 550°C at a rate of 5°C / min, k...
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