在完全除去铵离子的湿法氧化反应中,一种钌催化剂能够将文献报道的反应条件从543K,7.0 MPa缓和为453 K,3.0 MPa.但是,在相对温和的反应条件下,N2选择性不够理想,并受到操作条件如pH、反应温度、空填充压力及催化剂用量等的影响.在所试验的条件范围内,N2选择性在85.6%～98.1%间变化,而氨转化率却接近100%.对N2选择性和反应条件之间的关系进行了讨论,并通过正交试验找到了一个最佳反应条件,从而在温和的反应条件下,使氨的氧化能够有效地向着生成N2的方向进行.
For complete removal of NH+4 (82.7 mmol/L) through the wet air oxidation (WAO) process, a Ru catalyst enabled to ease the reaction conditions from 543K, 7.0 MPa to 453 K, 3.0 MPa. However, under the mild reaction condition, N2 selectivity was somewhat undesired, and was largely affected by operating condition factors, such as pH, temperature, air feed pressure and catalyst loading. Under the test reaction conditions, the N2 selectivity changed from 85.6% to 98.1%, but NH3 oxidation was kept near 100%. Basedon a result of an optimal experiment, a favorable reaction condition has been explored, so that the WAO of NH3 can be performed effectively towards N2 production even under the mild operating condition.
参考文献
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