Co-based composite metal oxide and preparation method thereof and application thereof in catalytic oxidation of toluene
A composite metal, catalytic oxidation technology, applied in metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, catalyst activation/preparation, etc., can solve the problems of effective regulation of physical and chemical properties of difficult catalysts, difficult to remove, etc. , to achieve high stability, improve utilization efficiency, and good application prospects
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Embodiment 1
[0020] Example 1: A Co-based composite metal oxide catalyst that catalyzes the oxidation of toluene, using MOF material as a self-template, adopts a simple impregnation and calcination method, and calcines at 350 ° C for 1 hour to obtain a series of Co-based composite metal oxides Catalyst: M-Co 3 o 4 / CuO x 、M-Co 3 o 4 / MnO x 、M-Co 3 o 4 / FeO x and M-Co 3 o 4 / NiO x .
[0021] Preparation of Co-based composite metal oxide catalyst: Take 0.04 g of imidazole-4,5-dicarboxylic acid and 0.06 g of cobalt acetate tetrahydrate and add it to 3 ml of deionized water, stir at room temperature, add 60 microliters of 1,2 -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, Dry in the air, vacuum-dry it at 150°C for 6-7 hours to obtain ZSA-1, and then place it in a ce...
Embodiment 2
[0024] Example 2: 0.2g of the catalysts a, b, c, and d prepared in Example 1 were loaded into a fixed-bed reactor, and the catalyst was activated at 200°C in a nitrogen stream before the reaction (the nitrogen flow rate was 30 ml / min). Then the temperature was lowered to 130 °C, and toluene was introduced to make the adsorption saturated (1000ppm, the space velocity was 20000ml g -1 • h -1 ), and then the toluene catalytic oxidation reaction was carried out at a heating rate of 10°C / min through temperature programming to a certain temperature. The conversion rate of catalyst to toluene at a certain temperature is as follows image 3 As shown, the required temperatures for catalysts a, b, c, and d to achieve 90% toluene removal rate are 208°C, 227°C, 243°C and 246°C, respectively.
Embodiment 3
[0025] Example 3: Carry out a stability test on the catalyst a prepared in Example 1, take 0.2 g of the catalyst a prepared in Example 1 and put it into a fixed-bed reactor, and pass nitrogen before the reaction (the flow rate is about 30ml / min) , first activate the catalyst at 200°C in a nitrogen stream (the nitrogen flow rate is 30 ml / min). Then, the temperature was programmed to rise to 230°C (toluene conversion rate was 100%) at a heating rate of 10°C / min for continuous 48 hours of catalytic oxidation of toluene. Toluene gas is blown out by the air through the bubbling device, which is 1000ppm toluene, and the space velocity is 20000ml•g -1 • h -1 . Such as Figure 4 As shown, the catalyst was continuously operated at a relatively high temperature of 230°C for 48 hours, and the conversion rate of toluene was 100% with good stability.
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