Molybdenum-tungsten supported catalyst, preparation method and application thereof, and method for preparing anthraquinone from anthracene
A supported catalyst, catalyst technology, applied in catalyst activation/preparation, catalyst, quinone oxide preparation and other directions, can solve the problems of unstable catalytic performance, low catalytic activity, etc., and achieve easy recovery and recycling, high catalytic activity, and reaction mild conditions
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[0020] According to a preferred embodiment of the present invention, based on oxides, the weight ratio of molybdenum to tungsten is 0.15-1.5:1, more preferably 0.2-1:1. In this preferred embodiment, under the synergistic effect of the active components molybdenum and tungsten in the catalyst, the catalytic performance of the catalyst is better. The inventors of the present invention found that, in this preferred embodiment, the molybdenum and tungsten metal elements in the catalyst are more uniformly dispersed, and at the same time exhibit weak acid, medium strong acid and strong acid sites, thereby promoting the acid-catalyzed oxidation reaction .
[0021] The present invention selects the content of each component in the catalyst in a wide range. Preferably, relative to 100 parts by weight of the carrier, the total content of molybdenum and tungsten is 10-40 parts by weight, preferably 12-40 parts by weight, in terms of oxides. 30 parts by weight.
[0022] In the present i...
specific Embodiment approach
[0030] According to a specific embodiment of the present invention, the catalyst includes an MCM-41 carrier and metal elements molybdenum and tungsten supported on the MCM-41 carrier.
[0031] According to a specific embodiment of the present invention, the catalyst includes an MCM-48 carrier and metal elements molybdenum and tungsten supported on the MCM-48 carrier.
[0032] According to a specific embodiment of the present invention, the catalyst includes an MCM-22 carrier and metal elements molybdenum and tungsten supported on the MCM-22 carrier.
[0033] According to a specific embodiment of the present invention, the catalyst includes an SBA-15 carrier and metal elements molybdenum and tungsten supported on the SBA-15 carrier.
[0034] According to a preferred embodiment of the present invention, the catalyst is composed of MCM-41 carrier and molybdenum and tungsten supported on the MCM-41 carrier.
[0035] The second aspect of the present invention provides a method for...
Embodiment 1
[0091] Prepare catalyst according to the method of the present invention, concrete process is as follows:
[0092] (1) At room temperature, 46mg of ammonium molybdate tetrahydrate (precursor of molybdenum), 68mg of ammonium tungstate hydrate (precursor of tungsten), 500mg of MCM-41 molecular sieve (carrier) and 20ml of ethanol (dispersant) were ultrasonically 0.25 h, then magnetically stirred for 6h to obtain the mixed precursor; the weight of the precursor of molybdenum in terms of oxides, the precursor of tungsten in terms of oxides, the carrier and / or carrier precursor and the dispersant The ratio is 3.8:6.2:50:1600;
[0093] (2) Dry the mixed precursor in an oven at 70°C for 3h, then grind it, and roast it at 500°C for 3h, and anneal for 12h to obtain catalyst S1;
[0094] Among them, relative to 100 parts by weight of the carrier, the total content of molybdenum and tungsten is 20 parts by weight in terms of oxides; the weight ratio of molybdenum and tungsten is 0.6:1 in...
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