Rare earth heteropolyacid modified mcm-41 catalyst and its application method in the production of methyl ethyl benzene
A technology of MCM-41 and rare earth modification, which is applied in the direction of molecular sieve catalysts, bulk chemical production, chemical instruments and methods, etc., and can solve the problem of low conversion rate of raw materials
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Embodiment 1
[0022] A kind of rare earth heteropolyacid modified MCM-41 catalyst, the catalyst is obtained through the following steps:
[0023] 1) Preparation of rare earth modified MCM-41 molecular sieve by hydrothermal synthesis method:
[0024] Add 1 part of tetraethyl orthosilicate, 18 parts of sodium metaaluminate, 0.18 parts of cetyltrimethylammonium bromide as a template, 0.01 part of rare earth metal salt and 100 parts of deionized water, and then add and mix them. Evenly, add potassium hydroxide to adjust the pH to 10~11, then hydrothermally crystallize at 180°C for 72 hours, filter, wash, and dry for 3 hours to obtain the rare earth modified MCM-41 molecular sieve; the rare earth metal salt is praseodymium nitrate.
[0025] 2) Loaded heteropoly acid molding:
[0026] Add 0.005 parts of heteropoly acid salt, 12 parts of deionized water and 0.85 parts of binder to 1 part of rare earth modified MCM-41 molecular sieve, stir evenly, and extrude; heteropoly salt uses germanium tungst...
Embodiment 2
[0031] A kind of rare earth heteropolyacid modified MCM-41 catalyst, the catalyst is obtained through the following steps:
[0032] 1) Preparation of rare earth modified MCM-41 molecular sieve by hydrothermal synthesis method:
[0033] Measure 1 part of tetraethyl orthosilicate, 36 parts of sodium metaaluminate, 0.20 part of cetyltrimethylammonium bromide as template agent, 0.05 part of rare earth metal salt and 140 parts of deionized water, add and mix in sequence, and stir Evenly, add potassium hydroxide to adjust the pH to 10~11, then hydrothermally crystallize at 210°C for 12 hours, filter, wash, and dry for 5 hours to obtain the rare earth modified MCM-41 molecular sieve; the rare earth metal salt is neodymium nitrate.
[0034] 2) Loaded heteropoly acid molding:
[0035] Add 0.02 parts of heteropoly acid salt, 18 parts of deionized water and 1.25 parts of binder to 1 part of rare earth modified MCM-41 molecular sieve, stir evenly, and extrude; heteropoly acid salt uses g...
Embodiment 3
[0040] A kind of rare earth heteropolyacid modified MCM-41 catalyst, the catalyst is obtained through the following steps:
[0041] 1) Preparation of rare earth modified MCM-41 molecular sieve by hydrothermal synthesis method:
[0042] Measure 1 part of ethyl orthosilicate, 12 parts of sodium metaaluminate, 0.20 parts of cetyltrimethylammonium bromide as template, 0.03 parts of rare earth metal salt and 120 parts of deionized water, add and mix in sequence, and stir Evenly, add potassium hydroxide to adjust the pH to 10~11, then hydrothermally crystallize at 190°C for 24 hours, filter, wash, and dry for 3~5 hours to obtain rare earth modified MCM-41 molecular sieve; rare earth metal salts are praseodymium, neodymium, samarium , any of the nitrates of europium.
[0043] 2) Loaded heteropoly acid molding:
[0044] Add 0.01 part of heteropoly acid salt, 15 parts of deionized water and 1.0 part of binder to 1 part of rare earth modified MCM-41 molecular sieve, stir evenly, and e...
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