A kind of preparation method of honeycomb cordierite-based cerium oxide nanotube desulfurizer
A cerium oxide-based and cordierite-based technology is applied in the field of preparation of cordierite-based desulfurizers, which can solve the problems of being easily blocked by flue gas dust, difficult industrial application, large fluid resistance, etc., and achieves high specific surface area, uniform dispersion, The effect of improving desulfurization performance
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Embodiment 1
[0030] Prepare 0.1mol / L zinc nitrate and hexamethylenetetramine solutions respectively, pour 15mL each into a hydrothermal reaction kettle, put the honeycomb cordierite substrate into the reaction kettle, take it out after hydrothermal reaction at 95°C for 4 hours, and deionize Rinse well with water and dry. The obtained SEM picture of the grown ZnO nanorod tube array is shown in Fig. 1(a).
[0031] Then, the honeycomb cordierite on which zinc oxide nanorod arrays had been grown was put into 0.1 mol / L zinc nitrate solution, and subjected to a hydrothermal reaction at 95° C. for 4 h. The cerium oxide nanotubes can be obtained on the surface of the cordierite. The scanning electron micrograph of the cerium oxide nanotube array is shown in Fig. 1(b). The small picture in the upper right corner of Figure 1(b) is a SEM image of a cerium oxide nanotube.
Embodiment 2
[0032] Example 2 Preparation of cerium oxide nanotube arrays by colloid coating on cordierite substrate
[0033] Prepare zinc acetate colloidal solution, the concentration of zinc acetate colloid is 0.1mol / L. The honeycomb cordierite substrate was immersed in a zinc acetate colloidal solution for pre-seeding. Zn(CH 3 COO) 2 The preparation process of the colloid is as follows: Zn(CH 3 COO) 2 2H 2 O dissolves into NH 2 OCH 2 CH 2 OH and CH 3 OCH 2 CH 2 In the mixed solution of OH, in which Zn(CH 3 COO) 2 2H2 O and NH 2 OCH 2 CH 2 With the same concentration of OH, the mixture was magnetically stirred at 60 °C for 30 min to obtain a uniform and stable Zn(CH 3 COO) 2 colloidal solution.
[0034] Colloid coating: Immerse the honeycomb cordierite in the zinc acetate colloid, take it out after it is fully infiltrated, blow air with argon gas with a certain pressure from one end of the honeycomb to the other end, and blow off the colloid solution remaining in the ho...
Embodiment 3
[0036] Example 3 Preparation of Cerium Oxide Nanotube Arrays by Laying a Cordierite Substrate Solution
[0037] Pre-laying seed crystals: preparing a mixed solution of zinc nitrate and hexamethylenetetramine, the concentration of zinc nitrate is 0.1mol / L, and the solubility of hexamethylenetetramine is 0.1mol / L. The honeycomb cordierite substrate is immersed in the mixed solution of zinc nitrate and hexamethylenetetramine. The solution coating method: zinc nitrate and hexamethylenetetramine are mixed in equal molar volumes, and the honeycomb cordierite is soaked in the mixed solution and taken out. , with argon blowing from one end of the honeycomb to the other end to blow off the remaining solution in the honeycomb holes. Dry it in the shade, then put it into a muffle furnace and anneal at 350-400°C for 10-20min.
[0038] After pre-laying the seed crystals, the same preparation method as in Example 1 was adopted. The morphologies of the obtained cerium oxide nanotubes are s...
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