Preparation and characterization of titanium dioxide as catalyst support for denitration
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摘要: 以硫酸法钛白粉生产的偏钛酸为原料，经过氨水中和，活性元素复合、煅烧、粉碎等工艺过程，制备了脱硝催化剂载体二氧化钛。利用粒度分布、XRD、SEM等测试手段对粉体的晶型结构、形貌等进行表征。结果表明制备的脱硝催化剂载体二氧化钛为锐钛型，粒度分布均匀，颗粒形貌较好；随着煅烧温度的升高，制备的脱硝催化剂载体二氧化钛SA90、SA100、SA200的衍射峰的强度都远低于纯锐钛型钛白粉样品BA01-01的衍射峰，结晶尺寸在100～200 nm，活性较好。Abstract: The specific titanium dioxide, a catalyst carrier for denitration, was prepared from metatitanic acid in the process of sulfuric acid titanium dioxide production, via ammonia neutralization, active element complexing, calcination and pulverization. The crystal structure and morphology of the powders were characterized by means of particle size distribution, XRD and SEM. The results show that the as-prepared titanium dioxide for denitration catalyst support is anatase type with uniform particle size distribution and good particle morphology. With the increase of calcination temperature, the diffraction peaks of the as-prepared denitration catalyst support TiO2 SA90, SA100 and SA200 are much lower than those of pure anatase titanium dioxide sample BA01-01. The crystal size is in the range of 100-200 nm, and the activity is good.
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Key words:
- denitration catalyst /
- titanium dioxide /
- metantitanic acid /
- crystal type /
- crystal size
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图 1 脱硝催化剂载体二氧化钛与锐钛型钛白粉的XRD谱
Figure 1. XRD image of denitration catalyst support TiO2 and anatase type TiO2
图 2 脱硝催化剂载体二氧化钛与锐钛型钛白粉的衍射峰强度
Figure 2. XRD patterns of denitration catalyst support TiO2 and anatase TiO2
图 3 脱硝催化剂载体二氧化钛与锐钛型钛白粉的SEM形貌
Figure 3. SEM images of denitration catalyst support TiO2 and anatase TiO2
图 4 脱硝催化剂载体二氧化钛与锐钛型钛白粉的TEM形貌
Figure 4. TEM images of denitration catalyst support TiO2 and anatase TiO2
图 5 脱硝催化剂载体二氧化钛与锐钛型钛白粉的粒径分布
Figure 5. Particle size distribution of denitration catalyst support TiO2 and anatase TiO2
表 1 制备脱硝催化剂载体二氧化钛与标准锐钛型钛白粉和金红石型钛白粉的晶粒尺寸
Table 1. Grain size of denitration catalyst support TiO2 and standard anatase TiO2 and rutile
nm SA90 SA100 SA200 BA01-01 金红石型 107 171 150 494 521 
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表 2 脱硝催化剂载体二氧化钛与锐钛型钛白粉的BET与粒度分布
Table 2. BET and particle size distribution of denitration catalyst support TiO2 and anatase TiO2
样品 BET/(m2·g−1) D10/μm D50/μm D90/μm SA90 107.00 0.461 1.049 2.087 SA100 107.92 0.383 0.93 2.360 SA200 108.46 0.359 0.822 4.218 BA01-01 9.25 0.351 0.750 1.719
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表 3 本研究制备的脱硝催化剂载体二氧化钛与国外产品的理化性能比较
Table 3. Physical and chemical properties comparison between the as-prepared denitration catalyst support TiO2 and some foreign products
样品 水分/% 游离（SO42−）/% 总（SO42−）/% TiO2/% R/% 晶粒度/nm SA90 4.1 3.51 5.13 91.3 0.11 12.1 MC-9 4.0 3.55 5.20 91.0 0.20 13.0 SA100 1.17 3.03 4.45 92.6 0.22 11.2 MC-9-L 1.35 3.00 4.50 92.0 0.30 12.0 SA200 0.4 2.79 3.52 95.3 0.26 9.2 MC-5 0.5 2.80 3.50 95.5 0.30 11.0
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