Method for improving acidity of MCM-22 molecular sieve based catalyst
A technology of MCM-22 and molecular sieve, which is applied in molecular sieve catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of low acid density, weak acid strength, limitations, etc., and achieve increased acid density and high catalytic activity Effect
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[0018] Example 1
[0019] Take 20g of Na-type MCM-22 molecular sieve that has been roasted to remove the template and put it in 200ml of Al(NO 3 ) 3 The solution is treated in a stainless steel reactor at 175 degrees Celsius for 72 hours, filtered, washed and dried; the product is exchanged in 400 ml of 0.8 mol / L ammonium nitrate solution at 80 degrees Celsius for 2 hours, two consecutive times, filtered and washed After drying, calcining at 540 degrees Celsius to obtain hydrogen molecular sieve. The molecular sieve is compressed into tablets and crushed into 20-40 mesh particles, which are recorded as Cat-B. The conversion rate of propylene and butene on the obtained catalyst sample changes with time, see figure 1 with figure 2 .
Example Embodiment
[0020] Example 2
[0021] Take 20g of Na-type MCM-22 molecular sieve that has been roasted to remove the template and put it in 200ml of Al(NO 3 ) 3 The solution is treated in a stainless steel reactor at 175 degrees Celsius for 72 hours, filtered, washed and dried; the product is exchanged in 400 ml of 0.8 mol / L ammonium nitrate solution at 80 degrees Celsius for 2 hours, two consecutive times, filtered and washed After drying, calcining at 540 degrees Celsius to obtain hydrogen molecular sieve. The molecular sieve is compressed into tablets and crushed into 20-40 mesh particles, which are recorded as Cat-C. The conversion rate of propylene and butene on the obtained catalyst sample changes with time, see figure 1 with figure 2 .
Example Embodiment
[0022] Example 3
[0023] Take 20g of Na-type MCM-22 molecular sieve that has been roasted to remove the template, and put it in 200ml of Al(NO 3 ) 3 The solution is treated in a stainless steel reactor at 175 degrees Celsius for 72 hours, filtered, washed and dried; the product is exchanged in 400 ml of 0.8 mol / L ammonium nitrate solution at 80 degrees Celsius for 2 hours, two consecutive times, filtered and washed After drying, calcining at 540 degrees Celsius to obtain hydrogen molecular sieve. The molecular sieve is compressed into tablets and crushed into 20-40 mesh particles, which are recorded as Cat-D. The conversion rate of propylene and butene on the obtained catalyst sample changes with time, see figure 1 with figure 2 .
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