钛白粉团聚体负载金属催化剂的脱硝活性

Denitrification Activity of Metal Catalyst Supported on Agglomerated Titanium Dioxide Particles

通过向工业钛白粉水相悬浮体系中添加十六烷基三甲基氯化铵作为改性助剂,制备出粒径均匀的球形二氧化钛团聚颗粒。通过傅里叶变换红外光谱、X-射线衍射、透射电子显微镜、BET比表面积测试法和扫描电子显微镜等分析手段表征了颗粒的结构形态及表面理化性质。团聚颗粒经煅烧后负载锰、钒等过渡金属氧化物制得脱硝催化剂,并对催化剂进行了脱硝活性评价。实验结果表明,与未改性的工业钛白粉相比,该颗粒物负载过渡金属氧化物时,煅烧前后均具有更大的比表面积、孔体积和孔径;与未改性钛白粉作载体相比,以该颗粒物为载体所制备的脱硝催化剂在催化剂适用温度窗口下,均表现出更好的脱硝活性。

Spherical agglomerated TiQparticles were prepared from industrial-grade titanium dioxide in aqueous suspension solution using cetyltrimethylammonium chloride （CTAC） as a modifier. The morphology and physicochemical properties of the particles were characterized with IR, XRD, TEM, BET and SEM. Denitrification catalyst was prepared with Mn/TiO2 and V/TiO2 supported on the obtained particles after its calcinations, and then the denitrification activity of the catalyst was evaluated. The experimental results show that, at both before and after calcination states, the catalyst supported on the agglomerated particles has a larger surface area, a bigger pore size and volume than that on the support of un-modified industrial-grade titanium dioxide, therefore, its denitrification activity is better in the applicable operating temperature window.