Catalyst support material, catalysts prepared therefrom and process for the treatment of a flue gas
The present invention relates to a catalyst support material and catalysts made therefrom having improved resistance towards erosion. The catalyst support contains at least 20% by weight of TiO 2 being present mainly in the anatase form. Furthermore, the catalyst support contains diatomaceous earth in an amount of at least 2% and less than 80% by weight of the catalyst support. In one embodiment catalysts made from said catalyst support contain oxides or sulfates of base metals from the group of V, W, Mn, Nb, Mo, Ni, Fe or Cu. Another option is a catalyst prepared from said catalyst support containing Pt or Pd. Said catalysts are used for treatment of a flue gas. More specifically the catalyst supports prepared according to the present invention and showing improved resistance towards erosion are used in flue gas containing a large amount of particulate matter and for selective catalytic reduction of nitrous oxides.
1. A process for treatment of a flue gas comprising the steps of:
providing a catalyst comprising a catalyst support material, and Pt or Pd or at least one oxide or sulphate of base metals selected from the group consisting of V, W, Mn, Nb, Mo, Ni, Fe and Cu; wherein the catalyst support material consists of TiO 2 mainly in the form of anatase in an amount of at least 20% by weight, and diatomaceous earth in an amount of at least 2% and less than 80% by weight; and
contacting the flue gas with the catalyst under conversion conditions in a catalytic reactor.
2. A process according to claim 1 , characterised by contacting the catalyst with a solid particle containing flue gas.
3. A process according to claim 2 , characterised by contacting the catalyst with a flue gas having a solid particle content higher than 2 g/Nm 3 flue gas.
4. A process according to claim 3 , characterised by contacting the flue gas at conversion conditions of a temperature in the range of 200° C. to 500° C. and a superficial gas velocity into the catalytic reactor in the range of 0.5 to 5 Nm/s.
5. A process according to claim 1 , characterised by being catalytic selective reduction of nitrous oxide and/or dioxin.