Method for preparing catalyst for refining of crude terephthalic acid
A crude terephthalic acid and catalyst technology, applied in the field of preparation of supported palladium/carbon catalysts, can solve problems such as unfavorable environmental protection or labor protection, difficulty in uniform distribution of carrier activated carbon, strong uncertain negative effects, etc., to achieve easy environmental protection The effect of handling, long service life and simple steps
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Embodiment 1
[0042] 100 grams of 4-8 mesh, specific surface 800-1800m 2 / g of coconut shell activated carbon is washed with 0.4mol / L nitric acid at a washing temperature of 80°C, and then washed with water until neutral.
[0043] Prepare Br with Potassium Bromide and Water - Concentration of 0.01mol / L soaking solution, impregnate activated carbon with equal volume for 2-24 hours, and dry at 80-120°C for 2-8 hours for later use.
[0044]The preparation of Pd solution, get the required amount of palladium-containing 15wt% chloropalladium acid solution, add deionized water to 40 milliliters, then add the required amount of acidic aqueous solution containing 8-hydroxyquinoline 5wt%, and add Prepare 60 ml of Pd solution with deionized water. After the Pd solution is stable for 10-200 minutes, the above treated activated carbon is impregnated with the Pd solution for 3 hours to obtain a catalyst precursor. Aging of the catalyst precursor for 24 hours, using 20 grams of 5wt% hydrazine hydrate ...
Embodiment 2~8
[0046] Different halides were selected to prepare the wetting solution containing halide ions, and the rest were the same as in Example 1. The specific halides and the concentration of halide ions in the immersion solution are listed in Table 1.
Embodiment 9~31
[0048] Select different Pd-containing compounds and complexing agents to prepare Pd solutions, and the rest are the same as in Example 1.
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