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排序方式: 共有224条查询结果,搜索用时 31 毫秒
211.
《环境科学学报(英文版)》2023,35(2):371-378
PdAg/Al2O3 were pretreated by CO and H2 reduction pretreatments, respectively. The reduced catalysts were tested for HCHO and CO oxidation and characterized by Brunner Emmet Teller (BET), X-ray diffraction (XRD), transmission electron microscopy (TEM), X‐ray photoelectron spectroscopy (XPS) and oxygen temperature programmed desorption (O2-TPD). These results indicate that the pretreatments have effect on PdAg reconstruction, PdAg particle size and active oxygen species, which are responsible for the catalytic performance. Compared with H2 reduction method, CO reduction is more suitable for PdAg/Al2O3 pretreatment. PdAg/Al2O3-CO exhibited better catalytic performance. 相似文献
212.
Linxia Yan Senlin Tian Jian Zhou Xin Yuan 《Frontiers of Environmental Science & Engineering》2016,10(6):5
? The Cu–Ni/γ-Al2O3 catalyst was prepared to study HCN hydrolysis
? On catalyst calcined at 400°C, the HCN removal efficiency reaches a maximum.
? HCN removal is the highest at 480 min at a H 2 O/HCN volume ratio of 150
? The presence of CO facilitates HCN hydrolysis and increases NH 3 production.
? O 2 increases the HCN removal and NOx production but decreases NH 3 production
GRAPHIC ABSTRACT
To decompose efficiently hydrogen cyanide (HCN) in exhaust gas, g-Al2O3-supported bimetallic-based Cu–Ni catalyst was prepared by incipient-wetness impregnation method. The effects of the calcination temperature, H2O/HCN volume ratio, reaction temperature, and the presence of CO or O2 on the HCN removal efficiency on the Cu–Ni/g-Al2O3 catalyst were investigated. To examine further the efficiency of HCN hydrolysis, degradation products were analyzed. The results indicate that the HCN removal efficiency increases and then decreases with increasing calcination temperature and H2O/HCN volume ratio. On catalyst calcined at 400°C, the efficiency reaches a maximum close to 99% at 480 min at a H2O/HCN volume ratio of 150. The HCN removal efficiency increases with increasing reaction temperature within the range of 100°C–500°C and reaches a maximum at 500°C. This trend may be attributed to the endothermicity of HCN hydrolysis; increasing the temperature favors HCN hydrolysis. However, the removal efficiencies increases very few at 500°C compared with that at 400°C. To conserve energy in industrial operations, 400°C is deemed as the optimal reaction temperature. The presence of CO facilitates HCN hydrolysis andincreases NH3 production. O2 substantially increases the HCN removal efficiency and NOx production but decreases NH3 production. 相似文献
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215.
纳米TiO2/沸石/UV催化臭氧化水中硝基苯的研究 总被引:1,自引:0,他引:1
设计了O3/纳米TiO2/沸石(体系A)和O3/纳米TiO2/沸石/UV(体系B)2种催化臭氧化体系并将其用于处理水中的硝基苯,研究了影响处理效果的主要因素,并对2种方法进行了比较。结果表明,2种催化臭氧化体系都能产生大量的羟自由基,加速硝基苯的降解,其中体系B对硝基苯的降解效果最好。随着进气流量的增加、温度的升高硝基苯的降解速率都会加快。催化臭氧化反应速率遵循一级反应规律,与苯酚的初始浓度和催化剂的用量关系不大。pH值对苯酚去除率有重要的影响,随pH值的升高,苯酚去除率显著提高。叔丁醇对硝基苯的降解有很强的抑制作用。 相似文献
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217.
The increasing amount of cyanided tailings produced as a by-product has gained significant attention in recent years because of the rapid development of the gold industry and extensive exploitation of gold mineral resources. The effective use of these secondary resources is becoming an important and urgent problem for all environmental protection staff. Manganese-catalyzed ozonation for the pre-oxidation of cyanided tailings was studied and the effects of Mn2 + dosage, initial sulfuric acid concentration, ozone volume flow, temperature and agitation speed on pretreatment were examined. The optimum reaction conditions were observed to be: ore pulp density 2.5%, agitation speed 700 r/min, temperature 60°C, Mn2 + dosage 40 g/L, ozone volume flow 80 L/hr, initial sulfuric acid concentration 1 mol/L, and reaction time 6 hr. Under these conditions, the leaching rate of Fe and weight loss could reach 94.85% and 48.89% respectively. The leaching process of cyanided tailings by Mn2 +/O3 was analyzed, and it was found that the leaching of pyrite depends on synergetic oxidation by high-valent manganese and O3, in which the former played an important part. 相似文献
218.
Yulong Li Dengxin Li Jiebing Li Jin wang Asif Hussain Hao Ji Yijie Zhai 《环境科学学报(英文版)》2015,28(2):14-21
The increasing amount of cyanided tailings produced as a by-product has gained significant attention in recent years because of the rapid development of the gold industry and extensive exploitation of gold mineral resources. The effective use of these secondary resources is becoming an important and urgent problem for all environmental protection staff. Manganese-catalyzed ozonation for the pre-oxidation of cyanided tailings was studied and the effects of Mn2+dosage, initial sulfuric acid concentration, ozone volume flow, temperature and agitation speed on pretreatment were examined. The optimum reaction conditions were observed to be: ore pulp density 2.5%, agitation speed 700 r/min,temperature 60°C, Mn2+dosage 40 g/L, ozone volume flow 80 L/hr, initial sulfuric acid concentration 1 mol/L, and reaction time 6 hr. Under these conditions, the leaching rate of Fe and weight loss could reach 94.85% and 48.89% respectively. The leaching process of cyanided tailings by Mn2+/O3 was analyzed, and it was found that the leaching of pyrite depends on synergetic oxidation by high-valent manganese and O3, in which the former played an important part. 相似文献
219.
Pan Gao Yuan Song Shaoning Wang Claude Descorme Shaoxia Yang 《Frontiers of Environmental Science & Engineering》2018,12(1):8
220.
Linbi Zhou Hongbin Cao Claude Descorme Yongbing Xie 《Frontiers of Environmental Science & Engineering》2018,12(1):1
Wet air oxidation (WAO) and catalytic wet air oxidation (CWAO) are efficient processes to degrade organic pollutants in water. In this paper, we especially reviewed the WAO and CWAO processes for phenolic compounds degradation. It provides a comprehensive introduction to the CWAO processes that could be beneficial to the scientists entering this field of research. The influence of different reaction parameters, such as temperature, oxygen pressure, pH, stirring speed are analyzed in detail; Homogenous catalysts and heterogeneous catalysts including carbon materials, transitional metal oxides and noble metals are extensively discussed, among which Cu based catalysts and Ru catalysts were shown to be the most active. Three different kinds of the reactor implemented for the CWAO (autoclave, packed bed and membrane reactors) are illustrated and compared. To enhance the degradation efficiency and reduce the cost of the CWAO process, biological degradation can be combined to develop an integrated technology.
相似文献