NO-CO-CO_2-N_2体系中若干金属氧化物对NO去除反应的催化作用

Catalytical performance of several metallic oxides on elimination of NO in NO CO CO 2 N 2 system.

采用固定床流动反应装置，考察Ｃｕ２Ｏ、ＣｕＯ、Ｃｒ２Ｏ３、Ｆｅ２Ｏ３、ＭｎＯ２、Ｎｉ２Ｏ３、Ｖ２Ｏ５等金属氧化物对ＮＯＣＯＣＯ２Ｎ２体系中ＮＯ去除反应的催化作用，同时，分析了ＮＯＣＯＣＯ２Ｎ２体系中金属氧化物对ＮＯ去除的作用。研究结果表明，各金属氧化物对ＮＯ去除反应均有不同程度的催化活性，其中Ｆｅ２Ｏ３、Ｎｉ２Ｏ３、ＣｕＯ等对ＮＯ的去除显示出较强的催化作用。金属氧化物存在条件下ＮＯＣＯＣＯ２Ｎ２体系中，ＮＯ去除反应较为复杂，ＮＯ／ＣＯ气相直接反应、低价氧化物对ＮＯ的还原作用、金属氧化物对ＮＯ分解反应的催化作用及金属氧化物对ＮＯ／ＣＯ反应的催化作用等都可能存在。大部分金属氧化物以对ＮＯ／ＣＯ反应的催化作用为主，而Ｎｉ２Ｏ３的预还原试样对ＮＯ的直接分解反应表现了极强的催化活性。

狢atalytic performance of several oxides, i.e. Cu 2O, CuO, Cr 2O 3, Fe 2O 3, MnO 2, Ni 2O 3 and V 2O 5 on elimination of NO in NO CO CO 2 N 2 system has been examined in a fixed bed reactor. At the same time, the roles of metallic oxides in the reaction system of NO CO CO 2 N 2 has been discussed. The experimental results show that each metallic oxide gives catalytic activity on the elimination of NO with different extent , and especially Fe 2O 3, Ni 2O 3, CuO, etc. give high catalytic activities. NO elimination reactions are much complicated in the system of NO CO CO 2 N 2 with the existence of metallic oxides. Homogeneous reaction between NO and CO, reduction of NO by the lower valued metallic oxides, direct decomposition of NO as a catalytic reaction and catalytic reaction of NO/CO may all contribute in NO elimination. The results of further experiments show that most of the metallic oxides give a catalytic effect on NO/CO reaction, while pre reduced Ni 2O 3 sample shows remarkable catalytic activity to the direct decomposition of NO.