甲醇燃料车尾气净化催化剂的研究Ⅱ.负载钯催化剂对甲醇低温深度氧化性能的研究

STUDY ON CATALYSTS FOR METHANOLFUELED VEHICLE EXHAUST CONTROL Ⅱ Deep Oxidation of Methanol on PdAl 2O 3

利用色谱微反联用技术对负载钯催化剂上甲醇、甲醛的深度氧化进行了较全面的研究。结果表明：Ｐｄ／Ａｌ２Ｏ３催化剂对甲醇氧化具有很高的转化效率和一定的深度氧化活性。以（ＮＨ４）２ＰｄＣｌ４为浸渍液、还原气氛下焙烧所得的０．１％Ｐｄ／γＡｌ２Ｏ３性能最好，当进气Ｏ２／ＣＨ３ＯＨ比为６、并无ＣＯ存在时，其Ｔ５０、Ｔ９５分别为９０℃、２００℃，生成甲醛的最高转化率为１７％左右。另外，反应原料气组分如Ｏ２、ＣＯ等也将严重影响Ｐｄ／γＡｌ２Ｏ３对甲醇氧化的活性及选择性。

The deep oxidation of methanol on aluminasupported palladium catalyst at low temperature has been investigated in a laboratory reactor The results are as follows: Pd/γAl 2O 3 catalysts have very high methanol oxidation activity and fairly good deep oxidation selectivity, in which, the 0 1% Pd/γAl 2O 3 prepared by impregnating (NH 4) 2PdCl 4 precursor solution into the gamma alumina powder and calcined in reducing gas has the highest activity, and its T 50 ,T 95 is 90℃, 200℃ respectively in the absence of CO The yields of partial oxidation products such as formaldehyde, methyl formate are not high In addition, the components of feed gas such as O 2, CO have strong influence on the activity and selectivity of methanol oxidation over Pd/γAl 2O 3 catalyst