Synergetic effect of Ru and Cu on catalytic wet oxidation of ammonia-wastewater

doi:10.11949/j.issn.0438-1157.20180186

Abstract

Abstract:

RuCu/TiO₂ bimetallic catalysts which were prepared via chemical reduction methods and the synergetic effect between Ru and Cu in the detoxification of ammonia-wastewater to nitrogen via catalytic wet air oxidation (CWAO) were investigated. The results showed that the addition of Cu in Ru/TiO₂ can effectively improve the selectivity of N₂, while the presence of Ru in Cu/TiO₂can greatly enhance the catalytic activity of the catalyst. The catalyst (1Ru2Cu/TiO₂) with 1% and 2% loading of Ru and Cu has the best catalytic performance among the prepared catalysts. With the reaction conditions of 0.5 MPa,150℃,[NH₃]₀=1000 mg·L^-1,pH=12 and the application to the simulated wastewater was about 33 L·(kg cat)^-1·h^-1, 1Ru2Cu/TiO₂ achieved 87.7% ammonia conversion and 85.9% N₂ selectivity. The characterization results demonstrated that the synergetic effect of Ru and Cu played a key role in the catalytic of the ammonia to nitrogen, mainly reflects in the following:the strong interaction between Ru and Cu results in good anti-leaching of 1Ru2Cu/TiO₂ catalyst, leading to excellent stability for the catalyst. The electron transfer between Ru and Cu makes 1Ru2Cu/TiO₂ has a moderate oxygen affinity, which has effectively enhanced the catalytic activity of the catalyst.

Key words: RuCu/TiO₂, catalytic wet air oxidation, ammonia-wastewater, synergetic effects, nanomaterials, catalysis, degradation

摘要：

采用化学还原法制备了RuCu/TiO₂双金属催化剂，并探究了Ru和Cu的协同作用对催化湿式氧化（CWAO）无害化处理氨氮废水催化性能的影响。研究结果表明，Cu的添加可有效改善Ru/TiO₂催化剂的N₂选择性，而Ru的存在可有效提高Cu/TiO₂催化剂的催化活性。反应条件为0.5 MPa、150℃、[NH₃]₀=1000 mg·L^-1、pH=12、模拟废水处理量为33 L·（kg cat）^-1·h^-1时，1Ru2Cu/TiO₂能使废水的氨氮转化率和N₂选择性分别高达87.7%和85.9%。表征结果表明：Ru和Cu的协同在催化氧化氨氮废水过程中起了关键作用，主要体现在：Ru和Cu的强相互作用导致1Ru2Cu/TiO₂催化剂具有良好的抗流失性能，进而使得催化剂具有良好的稳定性；Ru和Cu的电子转移使得1Ru2Cu/TiO₂具有适中的亲氧性能，有效提高了催化剂的催化活性。

关键词: RuCu/TiO₂, 催化湿式氧化, 氨氮废水, 协同作用, 纳米材料, 催化(作用), 降解

CLC Number:

TQ032

GENG Lili, YANG Kaixu, ZHANG Nuowei, CHEN Binghui. Synergetic effect of Ru and Cu on catalytic wet oxidation of ammonia-wastewater[J]. CIESC Journal, 2018, 69(9): 3869-3878.

耿莉莉, 杨凯旭, 张诺伟, 陈秉辉. Ru和Cu协同催化湿式氧化处理氨氮废水[J]. 化工学报, 2018, 69(9): 3869-3878.

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