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由三异丙氧基铝水解制得的γ-Al_2O_3,比铝盐沉淀得到的γ-Al_2O_3具有较高的比表面积和热稳定性。采用La_2O_3为稳定剂能推迟高温下γ-Al_2O_3的相变,监抑制烧结,从而减缓因高温而引起的表面积下降。以这种涂层处理后的蜂窝状载体,负载上化学式量为LaCu_(0.5)Mn_(0.5)O_3催化活性组份,经900℃焙烧后,测试催化剂对CO氧化的催化活性,结果表明载体上的涂层Al_2O_3加La_2O_3稳定化后,对提高催化剂的高温稳定性有明显的效果。
The γ-Al 2 O 3 prepared from the hydrolysis of aluminum triisopropoxide has a higher specific surface area and thermal stability than the γ-Al 2 O 3 obtained from the precipitation of aluminum salts. The use of La 2 O 3 as a stabilizer can delay the phase transition of γ-Al 2 O 3 at high temperature, and suppress the sintering, thereby reducing the surface temperature drop caused by high temperature. After being coated with the coating, the catalytic activity of the catalyst on CO oxidation was tested after being loaded on the catalytically active component of LaCu_ (0.5) Mn_ (0.5) O_3 and calcined at 900 ° C. The results show that on the carrier The coating Al 2 O 3 plus La 2 O 3 stabilized has obvious effect on improving the high temperature stability of the catalyst.