Carbonylation-dehydration bifunctional catalyst precursor, preparation method thereof, carbonylation-dehydration bifunctional catalyst and application of carbonylation-dehydration bifunctional catalyst
A carbonylation and catalyst technology, which is applied to the carbonylation-water removal bifunctional catalyst precursor and its preparation, and the carbonylation-water removal bifunctional catalyst field, can solve the problems of short service life of molecular sieves and the like, achieves simple operation and reduces equipment Investment and operating costs, achieving the effect of large-scale production
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[0029] In the present invention, the preparation method of the modified eight-membered ring pore structure silica-alumina molecular sieve preferably includes the following steps:
[0030] The molecular sieve is subjected to ammonium ion exchange treatment, and the obtained ammonia ion exchange molecular sieve is subjected to the first roasting to obtain the H-type molecular sieve;
[0031] The H-type molecular sieve is subjected to metal ion exchange treatment, and the obtained metal ion exchange molecular sieve is subjected to second roasting to obtain a modified eight-membered ring pore structure silicon-aluminum molecular sieve.
[0032] In the present invention, the source of the molecular sieve is not particularly limited, and commercially available products well known to those skilled in the art can be used.
[0033] In the present invention, the reagent required for the ammonium ion exchange treatment is preferably ammonium chloride or ammonium nitrate; the reagent requ...
Embodiment 1
[0070] (1) Weighing 9.7g copper nitrate trihydrate and 11.9g zinc nitrate hexahydrate were dissolved in 50mL deionized water to obtain copper nitrate-zinc nitrate mixed solution; weighing 8.7g anhydrous sodium carbonate was dissolved in 100mL deionized water to obtain Sodium carbonate solution; add 50mL deionized water into the round bottom flask, add copper nitrate-zinc nitrate mixed solution and sodium carbonate solution dropwise to the round bottom flask under the condition of 60°C, the dropping rate is to keep the pH=7 of the system Standard, heat preservation and stirring reaction for 3h after the dropwise addition; filter the obtained system after the reaction, wash the filter cake with deionized water and dry it in an oven at 110°C for 24h, and place the dried solid in an air atmosphere at 450°C for roasting 5h, obtain composite metal oxide (specifically copper-zinc composite oxide, the molar ratio of copper and zinc is 1:1); The composite metal oxide is placed in 5wt% H...
Embodiment 2
[0074] (1) Weighing 14.5g copper nitrate trihydrate, 8.9g zinc nitrate hexahydrate and 3.8g aluminum nitrate nonahydrate were dissolved in 50mL deionized water to obtain a mixed solution of copper nitrate-zinc nitrate-aluminum nitrate; weigh 11.5g anhydrous Dissolve sodium carbonate in 100mL deionized water to obtain a sodium carbonate solution; add 50mL deionized water to a round-bottomed flask, and add copper nitrate-zinc nitrate-aluminum nitrate mixed solution and sodium carbonate dropwise to the round-bottomed flask at 60°C solution, the dropping rate is based on keeping the pH of the system = 7, and after the dropping is completed, it is incubated and stirred for 3 hours; the system obtained after the reaction is filtered, and the filter cake is washed with deionized water and dried in an oven at 110°C for 24 hours. The dried solid was roasted in an air atmosphere at 450°C for 5 hours to obtain a composite metal oxide (specifically copper-zinc-aluminum composite oxide, the...
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