Study On Preparation And Desulphurization Performance Of Metal Oxide Loaded Nanometer Zirconia

The influence of different factors on phase and structure of ZrO₂ based nanometer desulphurization catalyst have been investigated in the paper. In simulated flue gas, activity of catalyst has been measured by gas chromatograph. The results are as follows:1. Different drying conditions have great effect on nanometer CuO/ZrO₂ catalyst for desulphurization, which is prepared by co-precipitation method. Outcome prepared by supercritical drying method has well-developed crystal and large specific surface area; while treated by freeze drying, product presents amorphous state, and specific surface area is small. After treated at the same temperature, deformation degree of the crystal lattice of freeze drying product is greater than that of supercritical drying outcome, and desulphurization rate is also higher than that of supercritical drying outcome.2. Compared with non-ionic surface active agents such as Tween 80 and PVA, ammonium citrate and DBS as the anion surface activators can reduce the average crystal grain of nanometer ZrO₂ more efficiently, and the desulphurization rate of the sample prepared by adding anion surface activators is also greater, but non-ionic surface active agent PEG-400 has the ability to complexate positive ion at the same time, which can prevent nanometer active components from growing up, so the catalytic absorption for SO₂ is best.3. Nanometer catalyst for desulphurization, which is prepared by fractional precipitation method, has good crystallinity and heavy intergranular aggregation. For nanometer CuO/ZrO₂ catalyst, the desulphurization rate of samples improves with the increment of specific surface area. However, the desulphurization rate of nanometer ZnO/ZrO₂ powder reaches maximum at about 200℃, and along with temperature going up, desulphurization rate drops gradually. Two different types of catalysts with 5% active component load capacity have the greatest desulphurization rate and best stability. In contrast with ZnO/ZrO₂ that can desulphurize under low temperature condition effectively, CuO/ZrO₂ is suitable for intermediate temperature desulphurization.4. The catalytic activity for SO₂ can be increased apparently by adding given cerium component into catalyst.