Molecular sieve based catalyst for carbonylation and preparation method and application thereof
A technology of carbonylation reaction and molecular sieve, which is applied in the direction of molecular sieve catalyst, carbon monoxide or formate reaction preparation, physical/chemical process catalyst, etc. It can solve the problems of easy collapse of molecular sieve structure, poor selectivity of dealumination, shortening the service life of molecular sieve catalyst, etc. question
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Embodiment 1
[0029] The preparation method of the molecular sieve catalyst used for carbonylation reaction of the present embodiment, such as figure 1 shown, including the following steps:
[0030] 1) Roast the original powder of mordenite molecular sieve, then immerse it in 1mol / L ammonium nitrate solution for 2 hours for ammonia exchange, then wash and dry, repeat the steps of ammonia exchange, washing and drying 3 times, and then roast at 550°C for 4 hours, Prepared hydrogen-type mordenite molecular sieve;
[0031] 2) Immerse the hydrogen-type mordenite molecular sieve prepared in step 1) in a mixed solution of lanthanum nitrate and ferric nitrate for 12 hours for ion exchange, then filter, dry, and then roast at 550° C. for 4 hours to obtain a metal oxide loading capacity of 2.0% (mass fraction) metal oxide modified molecular sieve; the amount concentration of lanthanum nitrate in the mixed solution is 1mol / L, and the amount concentration of iron nitrate is 2mol / L; oxidation in metal ...
Embodiment 2
[0036] The preparation method of the molecular sieve catalyst that is used for carbonylation reaction of the present embodiment comprises the following steps:
[0037] 1) Roast the original powder of mordenite molecular sieve, then immerse it in 1mol / L ammonium nitrate solution for 2 hours for ammonia exchange, then wash and dry, repeat the steps of ammonia exchange, washing and drying 3 times, and then roast at 550°C for 4 hours, Prepared hydrogen type mordenite molecular sieve;
[0038] 2) Immerse the hydrogen-type mordenite molecular sieve prepared in step 1) into a solution of 2 mol / L calcium nitrate for 12 hours for ion exchange, then filter, dry, and then roast at 550° C. for 4 hours to obtain a metal oxide Loading capacity is 2.5% (mass fraction) metal oxide modified molecular sieve;
[0039] 3) Take a certain amount of the metal oxide modified molecular sieve prepared in step 2) and place it in a reactor, heat it to 600°C under air purging and keep it warm for 0.5h, t...
Embodiment 3
[0043] The preparation method of the molecular sieve catalyst that is used for carbonylation reaction of the present embodiment comprises the following steps:
[0044] 1) Roast the original powder of mordenite molecular sieve, then immerse it in 1mol / L ammonium nitrate solution for 2 hours for ammonia exchange, then wash and dry, repeat the steps of ammonia exchange, washing and drying 3 times, and then roast at 550°C for 4 hours, Prepared hydrogen-type mordenite molecular sieve;
[0045] 2) Soak the hydrogen-type mordenite molecular sieve prepared in step 1) in a zinc acetate solution with a concentration of 2.5 mol / L for 6 hours for ion exchange, then filter, dry, and then roast at 550° C. for 4 hours to obtain metal oxide The material load is 1.5% (mass fraction) metal oxide modified molecular sieve;
[0046] 3) Take a certain amount of the metal oxide modified molecular sieve prepared in step 2) and place it in the reactor, heat it to 500°C under the purging of oxygen and...
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