Catalyst carrier and preparation method
A technology of catalyst carrier and modifier, which is applied in the field of materials, can solve the problems that the preparation method needs to be improved, and achieve the effects of increasing pore volume, good high-temperature thermal stability, and improving high-temperature thermal stability
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Embodiment 1
[0055] 1) Aluminum hydroxide is dissolved in alkali to obtain NaAlO with a concentration of 100g / l 2 solution.
[0056] 2) Prepare a nitric acid solution with a mass fraction of 23%, and add 4% (calculated as alumina) lanthanum nitrate modifier into the nitric acid solution.
[0057] 3) Prepare the base solution containing 5% PEG-2000 (calculated as alumina).
[0058] 4) Sodium aluminate solution and nitric acid solution are sprayed into the bottom solution in parallel, the precipitation temperature is 50°C, and the precipitation pH value is 6.5-7.0;
[0059] 5) The precipitated slurry is aged at 90°C for 72h.
[0060] 6) Slurry is filtered and washed by countercurrent washing with a weak ammonia solution with a pH value of 9.0 for 8 times, the liquid-solid ratio is 10:1, the washing desodination temperature is 85° C., and the washing time is 20 Min.
[0061] 7) After washing and removing sodium, the filter residue is dried in a drying oven.
[0062] 8) The modified alumin...
Embodiment 2
[0066] 1) Aluminum hydroxide is dissolved in alkali to obtain NaAlO with a concentration of 100g / l 2 solution.
[0067] 2) Prepare a nitric acid solution with a mass fraction of 23%, and add 4% (calculated as alumina) lanthanum nitrate and 0.4% praseodymium nitrate (calculated as alumina) combined modifiers into the nitric acid solution.
[0068] 3) Prepare the base solution containing 2% PEG-2000 (calculated as alumina).
[0069] 4) The sodium aluminate solution and the nitric acid solution are sprayed into the bottom solution in parallel, the precipitation temperature is 50°C, and the precipitation pH value is 7.0-7.8.
[0070] 5) The precipitation slurry is aged at 80°C for 24 hours;
[0071] 6) Slurry is filtered and washed by countercurrent washing with a weak ammonia solution with a pH value of 9.0 for 8 times, the liquid-solid ratio is 10:1, the washing desodination temperature is 85°C, and the washing time is 30 Min.
[0072] 7) After washing and removing sodium, th...
Embodiment 3
[0077] 1) Aluminum hydroxide is dissolved in alkali to obtain NaAlO with a concentration of 100g / l 2 solution.
[0078] 2) prepare the nitric acid solution of mass fraction 18%, and in nitric acid solution, add the lanthanum nitrate of 1.6% (in alumina), 0.4% dysprosium nitrate (in alumina), 12% of cerium nitrate and 24% of nitric acid Zirconium combination modifier.
[0079] 3) Prepare a bottom solution containing Tween 80 1% (calculated as alumina) and 3% (calculated as alumina) polyethylene glycol fatty acid ester.
[0080] 4) The sodium aluminate solution and the nitric acid solution are sprayed into the bottom solution in parallel, the precipitation temperature is 50° C., and the precipitation pH value is 6.7 to 7.5.
[0081] 5) The precipitation slurry is aged at 85° C. for 10 h.
[0082] 6) Slurry is filtered and washed by countercurrent washing with a weak ammonia solution with a pH value of 8.5 for 8 times, the liquid-solid ratio is 15:1, the washing desodination t...
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