沉积-沉淀法制备金催化剂用于CO催化氧化的研究

Gold catalyst preparation by deposition-precipitation methodfor CO oxidation

摘要:

采用沉积-沉淀法制备了一种介孔氧化铝负载的金催化剂用于CO的低温催化氧化，详细考察了催化剂制备条件、干燥条件和热处理条件对其催化性能的影响。采用X射线粉末衍射（XRD）、透射电镜（TEM）、低温N2物理吸附（N2-BET）、电感耦合等离子发射光谱（ICP-AES）和紫外-可见漫反射（Uv-vis DRS）等手段对催化剂进行了表征。实验结果表明，通过严格控制催化剂的制备条件、干燥条件和热处理条件，可以在惰性氧化铝载体上高重复性可控合成具有高分散度的金催化剂，金颗粒最佳平均粒径为2 nm，体现出良好的CO低温催化氧化性能。

Abstract:

A gold catalyst Au/meso-?-Al2O3 was synthesized by depositing Au NPs onto a home-made mesoporous ?-Al2O3 via deposition-precipitation method for the CO oxidation. The preparation, drying and calcination conditions were systematically investigated, and the catalysts were characterized by X-ray diffraction (XRD), transmission electron microscope (TEM), N2 adsorption isotherm at -196 oC, inductively coupled plasma atomic emission spectrometry (ICP-AES), and Uv-vis DRS. The experimental testing results indicated that the small Au NPs of ~2.0 nm is highly active for the CO oxidation, which could be realized by accurately controlling the preparation, drying and calcination conditions.