Ti-Si-Ox脱硝催化剂载体的组分优化及其性能研究

采用挤出成型法制备系列Ti-Si-Ox复合氧化物催化剂载体，研究了Ti-Si-Ox催化剂载体组分配比、酸量、比表面积与脱硝性能和抗压强度的关系。采用XRD、Raman spectra、N2-BET、Py-IR以及XPS等表征技术对催化剂载体进行表征。结果表明：Ti/Si元素摩尔比为9∶1时Ti0.9Si0.1Ox催化剂载体的轴向抗压强度适中且脱硝催化活性最高；在5 000 h-1空速条件下，催化剂载体最高脱硝活性在400 ℃时达到99.0%且起燃温度降至260 ℃；另外，Ti0.9Si0.1Ox催化剂载体的比表面积为75.4 m2·g-1，介孔最可几分布为8.1 nm，轴向抗压强度为1.4 MPa，符合工业应用条件，即Ti-Si-Ox载体具有较好的工业应用前景。

Component optimization and performance of Ti-Si-Ox deNOx catalyst carrier

A series of Ti-Si-Ox catalyst carriers were prepared by extrusion method and tested for selective catalytic reduction (SCR) of NO with NH3.The influence of component proportion, specific surface area and total acid quantity of Ti-Si-Ox catalyst carriers on catalytic activity and compressive strength was investigated. These catalysts were characterized by XRD, N2-BET, Py-IR and XPS respectively. Results showed that the catalyst carrier exhibited the highest catalytic performance and appropriate compressive strength when the Ti/Si molar ratio was equal to 9:1.Under the GHSV of 5 000 h-1, the Ti0.9Si0.1Ox obtained 99.0% NO conversion at 400℃ and the light-off temperature decreased to 260℃. The specific surface area was 75.4 m2·g-1, the most probable meso pore distribution was 8.1 nm and the axial compressive strength was 1.4 MPa. In other words, the Ti-Si-Ox catalyst carrier had a good application prospect of industry.