Ammonium Metatungstate for Tungsten Trioxide Based Ultra-Strong Acid Desulfurization Catalyst
The sulfide in the In the fuel will unavoidable release into the air in the form of gas when in the combustion process, which will probably causes a series of issues that destroying ecosystems like acid rain, damaging buildings. As the improving of people's awareness of environmental protection and vehicle fuel emission standards, increasingly strict restrictions on the sulfur content of fuel oil index has been worked out, therefore, the production and using of ultra-low sulfur fuel oil is imperative. In deep desulfurization, the application of traditional method of hydrodesulfurization (HDS) has been limited, because of its disadvantages such as harsh reaction conditions, equipment investment and higher operating costs.
Oxidative desulfurization is using an oxidizing agent to oxidize the sulfur compounds like thiophene in the fuel which are difficult to remove to sulfoxide or sulfone sulfur-containing materials with stronger polar in normal temperature, pressure and the presence of catalyst conditions, and then removing the sulfoxide or sulfone sulfur-containing materials by the methods like extraction, thus to achieve the goal of deep desulfurization. Oxidative desulfurization is considered to be a very attractive desulfurization technology, which usually consists of two steps: first, the fuel sulfide oxidation; second, removing the oxidized sulfur compounds from fuel oil by extraction, adsorption and distillation methods.
The key of desulfurization method is developing an oxidative desulfurization catalyst with good properties of high desulfurization rate, oil yield, and low cost. Research indicates that a kind of zirconium hydroxide as a carrier, then immerse in the aqueous solution constitute of ammonium metatungstate after finely crushed; the immersion liquid placed in an ultrasonic generator ultrasonic to promote the dipping, evaporating the water, dried, and roasting at the high temperature to generate the WO3/ZrO2 solid ultra-strong acid desulfurization catalyst. This catalyst exhibits good activity and selectivity, and high desulfurization rate when used for the deep desulfurization of diesel fuel.
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