MOF-cobalt-based metal oxide catalyst for catalytic oxidation of toluene as well as preparation method of MOF-cobalt-based metal oxide catalyst
A catalytic oxidation, MOF-technology, applied in the direction of metal/metal oxide/metal hydroxide catalyst, catalyst activation/preparation, physical/chemical process catalyst, etc., can solve the problem of long consumption time, low mass transfer rate, relative energy High energy consumption and other problems, to achieve the effect of simple preparation method, reduce energy consumption, and save cost
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Embodiment 1
[0021] Example 1: A MOF-cobalt-based metal oxide catalyst that catalyzes the oxidation of toluene. It is characterized in that: using MOF material as a precursor, it is calcined at 250°C, 350°C or 450°C for 1 hours, to obtain cobalt-based metal oxide catalyst: M-Co 3 o 4 -250, M-Co 3 o 4 -350 and M-Co 3 o 4 -450.
[0022] Preparation of MOF-cobalt-based metal oxide catalyst: Add 0.04g of imidazole-4,5-dicarboxylic acid and 0.06g of cobalt acetate tetrahydrate into 3ml of deionized water, stir at room temperature, add 60 microliters of 1 during stirring, 2-propylenediamine solution, after 15 minutes, move the solution to the reaction kettle, react at 120°C for 22 hours, take it out and cool it naturally, transfer the product to a beaker and wash it with deionized water until pure red octahedral crystals are obtained , dried in the air to obtain cobalt-based MOF-ZSA-1, which was vacuum-dried at 150°C for 6-7 hours, and then calcined in air at 250°C, 350°C and 450°C for 1 h...
Embodiment 2
[0025] Example 2: Tablet the catalysts a, b, and c prepared in Example 1, sieve and take 0.2g catalyst of 20-60 mesh and put it into a fixed-bed reactor (a reaction tube with an inner diameter of about 6mm), and pass through the catalyst before the reaction. Nitrogen (flow rate is about 30ml / min), the temperature of the reaction tube is raised to 200°C and kept for 1 hour to remove various impurities on the surface of the catalyst. Then the temperature was lowered to 125°C, controlled by temperature program, and raised to 125°C-280°C at a rate of 10°C / min to carry out continuous toluene catalytic oxidation reaction. For air, the space velocity is 20000-80000ml•g -1 •h -1 . Catalyst reactivity as image 3 As shown, catalysts a, b, and c can achieve 90% removal rate of toluene at 313°C, 239°C and 254°C, respectively.
Embodiment 3
[0026] Embodiment 3: The catalyst b prepared in the embodiment 1 is carried out stability test test, gets the catalyst b prepared in the embodiment 1 of 0.2g and presses, after crossing the 20-60 mesh sieve, the catalyst is packed in the fixed-bed reactor (inner diameter The reaction tube is about 6mm), and before the reaction, pass nitrogen gas (flow rate is about 30ml / min), raise the temperature of the reaction tube to 200°C, and keep it for 1 hour to remove various impurities on the surface of the catalyst. Then the temperature was raised to 232°C at a rate of 10°C / min (the conversion rate of toluene was about 50%), and the catalytic oxidation reaction of toluene was carried out continuously at this temperature for 24 hours. Then continue to raise the temperature to 260°C at a rate of 10°C / min (the conversion rate of toluene is about 100%), and continue to carry out the continuous toluene catalytic oxidation reaction at this temperature for 24 hours. The reaction gas is blo...
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