WO3 Used in Hydrodesulfurization Catalyst

The WO₃ hydrodesulfurization catalyst with nanoscale, high dispersion and activity which can be used in the process of distillate hydrodesulfurization, and carried out in a fixed bed reactor, at a reaction temperature of 200-400℃, pressure of 0.2-20MPa, its production steps are as follows:

1. Dissolve the tungsten oxide in the concentrated hydrochloric acid, and carried out electrolysis to generate the hydrochloric acid solution containing with tungsten trioxide;

2. Inlet the hydrogen sulfide gas to get a vulcanization reaction, wherein the gas flow rate is 60~200ml/min, the vulcanizing agents can be in place of ammonium polysulfide, lee sodium sulfide, ammonium sulfide;

3. Taken out oxidation under the condition of oxygen or air at 60~120℃ for 24~56 hours;

4. carried out decompression and distillation to get the mixture, then diluted with hydrochloric acid, filtered and separated by carbide insert resin column to obtain a core sulfur-containing transition metal atom clusters which are as the following clusters: [M ₂ OnS ₂ -n] m +, [m ₃ OnS ₄ -n] m + or [m ₄OnS₆;-n] m + a, wherein m=W, n=0~6, m=0~6;

5. The products obtained in Step 4 are loaded to kinds of carriers by dipping or ion exchange method under the oxygen content of less than 0.1% of an inert atmosphere (helium, argon or nitrogen), then you will get the sulfur catalyst loading type of transition metal atom clusters, which is the needed--tungsten trioxide hydrogen desulfurization catalyst.

 

The prepared catalyst has the following advantages:

1. Raw materials are simple and easy to get with low cost, mild preparation conditions, simple operation;

2. Compared with the traditional metal catalysts, it has the similar composition; at the same time, it also has the better dispersion and smaller particle size, and thus has a higher hydrodesulfurization activity;

3. With a strong resistance to sulfur poisoning which makes it being a very potential liquid fuel hydrodesulfurization catalyst.