Boehmite is the main raw material to
produce aluminum oxide. γ-Al2O3 obtained by the calcination of boehmite as the
carrier, and load nickel oxide and tungsten trioxide, add a additive-fluorine,
thus to produce tungsten trioxide hydrodesulfurization catalyst with high
activity. The different purities of boehmite have a certain degree of influence
on the activity of the desulfurization catalyst.
Boehmite |
Low-purity boehmite prepares WO3 hydrodesulfurization catalyst
1. Take aluminum hydroxide powder
generated by aluminum sulfate- sodium aluminate method from boehmite with a
purity of 35% by weight, add the extrusion aid and water, extruded strip of 1.2
mm in diameter, dry in an oven at 120 ℃for 4 hours and
then roasted at 550 ℃ in a tube furnace
under the air for 4 hours to obtain γ-Al2O3 (A);
2. Dissolve ammonium fluoride in deionized
water, add the carrier which is cooled down to room temperature for
impregnation for 4 hours at room temperature;
3. Separate and dry the wet fluorinated
alumina bar in an oven at 120 ℃ for 4 hours, then
heated at 500 ℃ in a tube furnace with dry air for 4 hours
to obtain fluorinated alumina strip, removed and cooled down to room
temperature;
4. Add fluorided alumina to the deionized
water containing with ammonium metatungstate and nickel nitrate, and separate
after dip at room temperature for 4 hours to obtain wet catalyst;
5. Dry the wet catalyst in an oven at 120 ℃ for 4 hours, and calcine under the air in a tube furnace
at 500 ℃ for 4 hours to obtain the catalyst A.
High-purity boehmite prepares WO3 hydrodesulfurization catalyst:
1. Take aluminum hydroxide powder
(obtained from the hydrolysis of aluminum alkoxide) with the boehmite purity of
70% by weight, add extrusion aid and water, then squeeze to a strip with a
diameter of 1.2 mm, dry in an oven at 120 ℃ for 4 hours, then
calcine at 550 ℃ for 4 hours in a tube furnace accompanying
with the air to give γ-Al2O3 (B);
2. γ-Al2O3 (B) for the preparation of the
carrier catalyst B, the same preparing method of the low purity boehmite.
Analysis showed that the aluminum oxide
generated from high-purity of boehmite has the larger amount of acid, while the
boehmite prepared by calcination has a larger amount of strong acid; tungsten
desulfurization catalyst B prepared by aluminum alkoxide hydrolysis of a
high-purity oxide boehmite has a higher activity.
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