Sulfur-tolerant catalyst for gas deoxidation as well as preparation method and application thereof
A catalyst and gas technology, applied in the field of catalyst for gas deoxidation and its preparation, can solve the problems of easy deactivation of palladium, high catalyst cost, easy loss of palladium and the like
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[0038] The preparation method of deoxidation catalyst of the present invention is as follows:
[0039] (1) Select a suitable inert carrier material as the catalyst skeleton.
[0040] (2) Mix aluminum hydroxide with commercially available or self-made cerium-zirconium composite oxides according to a molar ratio of 0.5 to 5, add 0.1 to 2% by volume of dilute nitric acid solution, the volume of dilute nitric acid added is equal to cerium-zirconium composite oxide and 2 to 20 times the mixing volume of aluminum hydroxide, wet ball milling into slurry.
[0041] (3) Coating the prepared slurry onto an inert catalyst carrier.
[0042] (4) Drying, such as drying at 80-150°C for 6-15 hours, then at 500-900°C, calcining for 2-6 hours, and heating up to 500-900°C can be temperature-programmed within 2-5 hours, thus obtaining the obtained Catalyst support is required.
[0043] (5) The above steps can be repeated until the desired loading is obtained.
[0044] (6) Prepare molybdenum-co...
Embodiment 1
[0061] Preparation of cerium-zirconium composite oxide: Weigh 64.4 g of zirconium oxychloride and 86.8 g of cerium nitrate, respectively, and dissolve them in 500 ml of deionized water, and mix the two solutions after complete dissolution. Under stirring conditions, add ammonia solution with a concentration of 25% to the mixed solution dropwise, and control the pH value of the end point of the titration to be 9.5 to 10. After the titration is completed, the precipitate is allowed to stand for 12 hours, and the precipitate is filtered and washed until the pH value is reached. 7, dried at 100°C for 6 hours, and ground into powder. The temperature was programmed to rise to 900°C within 3 hours, and calcined for 4 hours to obtain the structural formula CeO 2 · ZrO 2 57.89 g of cerium-zirconium composite oxides are used for subsequent use.
[0062] Weigh 100 g of alumina pellets (volume 66 ml) as an inert carrier for the catalyst. Weigh 30g of cerium-zirconium composite oxide an...
Embodiment 2
[0067] The carrier preparation process is the same as in Example 1.
[0068] Weigh 50 g of ammonium dimolybdate, dissolve it in 100 ml of 15% ammonia solution in deionized water, and prepare ammonium dimolybdate solution. The prepared catalyst carrier was impregnated therein for 3 hours, dried at 100° C. for 12 hours, and the above experiment was repeated twice.
[0069] Weigh 10 g of lanthanum nitrate, dissolve it in 100 ml of deionized water to prepare a lanthanum nitrate solution, impregnate the catalyst precursor loaded with ammonium dimolybdate in it for 3 hours, and dry at 100° C. for 12 hours.
[0070] The catalyst precursor loaded with molybdenum and lanthanum was programmed to heat up to 700° C. within 3 hours, and calcined for 2 hours to obtain a catalyst precursor loaded with molybdenum trioxide and lanthanum oxide.
[0071] Measure 66ml of chloroplatinic acid solution with a concentration of 10mg / ml, soak the prepared catalyst pellets for 30 minutes, dry at 100°C ...
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