Modification method of hydrogen type mordenite molecular sieve for dimethyl ether carbonylation reaction
A carbonylation reaction, mordenite technology, applied in molecular sieve catalysts, chemical instruments and methods, carbon monoxide or formate reaction preparation, etc., can solve the problem of easy carbon deposition and deactivation on mordenite molecular sieves, reduced catalytic activity, and hinder industrial applications. and other problems, to achieve high catalytic stability and high selectivity, restore catalytic activity, and the method is simple and easy to operate.
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[0028] Example 1
[0029] 1) Put H-MOR mordenite with a silicon-to-aluminum ratio of 5:1 into the reactor, and dry it at 300°C for 1 hour under Ar gas;
[0030] 2) The dried catalyst is cooled to 250°C, and 0.5% pyridine / He mixed gas is introduced until the catalyst is saturated with pyridine adsorption;
[0031] 3) After the adsorption of pyridine is saturated, pass in N 2 The gas is heated to 300℃; at 300℃, N 2 Pyridine was desorbed under air for 1 hour to obtain a pyridine-selectively modified mordenite molecular sieve MOR-250-300.
[0032] The catalyst is used for the carbonylation of dimethyl ether to prepare methyl acetate. The reaction conditions are as follows: the reaction pressure is 1.5 MPa, and the reaction gas composition is 3.0% DME / 95.5% CO / 1.5% N 2 , The space velocity is 5280mL(g·h) -1 . The catalytic activity curve of the prepared MOR-250-300 catalyst for the carbonylation of dimethyl ether to methyl acetate is as follows: figure 1 As shown, it can be seen from the f...
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[0033] Example 2
[0034] 1) Load H-MOR mordenite with a silicon-to-aluminum ratio of 6:1 into the reactor, 2 Dry for 72h at 500℃ under air;
[0035] 2) Lower the temperature of the dried catalyst to 300°C and pass in 2% pyridine / N 2 / Ar mixed gas until the catalyst is saturated with pyridine adsorption;
[0036] 3) After the adsorption of pyridine is saturated, pass in N 2 The gas is heated to 400℃; at 400℃, N 2 Pyridine was desorbed under air for 1 hour to obtain a pyridine-selectively modified mordenite molecular sieve MOR-300-400.
[0037] The catalyst is used for the carbonylation of dimethyl ether to prepare methyl acetate. The reaction conditions are as follows: the reaction pressure is 1.5 MPa, and the reaction gas composition is 3.0% DME / 95.5% CO / 1.5% N 2 , The space velocity is 5280mL(g·h) -1 . The catalytic activity curve of the prepared MOR-300-400 catalyst for the carbonylation of dimethyl ether to methyl acetate is as follows: figure 2 As shown, it can be seen from the ...
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[0038] Example 3
[0039] 1) Load the H-MOR mordenite with a silicon-to-aluminum ratio of 16:1 into the reactor and dry it at 400°C for 96h under He gas;
[0040] 2) The dried catalyst is cooled to 350°C, and 2% pyridine / He mixed gas is introduced until the catalyst is saturated with pyridine adsorption;
[0041] 3) After the adsorption of pyridine is saturated, Ar gas is introduced and the temperature is raised to 400°C; the pyridine is desorbed under Ar gas at 400°C for 1 h to obtain a pyridine-selectively modified mordenite molecular sieve MOR-350-400.
[0042] The catalyst is used for the carbonylation of dimethyl ether to prepare methyl acetate. The reaction conditions are as follows: the reaction pressure is 1.5 MPa, and the reaction gas composition is 3.0% DME / 95.5% CO / 1.5% N 2 , The space velocity is 5280mL(g·h) -1 . The catalytic activity curve of the prepared MOR-350-400 catalyst for the carbonylation of dimethyl ether to methyl acetate is as follows image 3 As shown, it ca...
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