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Search Results (3)

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Keywords = exhaust denitration

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23 pages, 3749 KiB  
Review
Research Progress on Metal Oxides for the Selective Catalytic Reduction of NOx with Ammonia
by Lanyi Wang, Shengran Zhou, Mengxia You, Di Yu, Chunlei Zhang, Siyu Gao, Xuehua Yu and Zhen Zhao
Catalysts 2023, 13(7), 1086; https://doi.org/10.3390/catal13071086 - 11 Jul 2023
Cited by 12 | Viewed by 3292
Abstract
Nitrogen oxides emitted from diesel vehicle exhaust seriously endanger the atmospheric environment and human health, which have attracted people’s attention. Among numerous nitrogen oxide (NOx) removal technologies, photocatalytic removal of NOx and SCR have received widespread attention. The photocatalytic treatment [...] Read more.
Nitrogen oxides emitted from diesel vehicle exhaust seriously endanger the atmospheric environment and human health, which have attracted people’s attention. Among numerous nitrogen oxide (NOx) removal technologies, photocatalytic removal of NOx and SCR have received widespread attention. The photocatalytic treatment of NOx technology is a good choice due to its mild reaction conditions and low costs. Moreover, NH3-SCR has been widely used in denitration technology and plays an important role in controlling NOx emissions. In NH3-SCR technology, the development of high-efficiency catalysts is an important part. This paper summarizes the research progress of metal oxide catalysts for NH3-SCR reactions, including V-based catalysts, Mn-based catalysts, Fe-based catalysts, Ce-based catalysts, and Cu-based catalysts. Meanwhile, the detailed process of the NH3-SCR reaction was also introduced. In addition, this paper also describes a possible SO2 poisoning mechanism and the stability of the catalysts. Finally, the problems and prospects of metal oxide catalysts for NOx removal were also proposed. Full article
(This article belongs to the Special Issue Catalysts for Selective Catalytic Reduction (SCR) and Related Reactions)
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11 pages, 2021 KiB  
Article
Experimental Study on the Removal of Real Exhaust Pollutants from a Diesel Engine by Activated Carbon
by Zongyu Wang, Hailang Kuang, Jifeng Zhang, Lilin Chu and Yulong Ji
Appl. Sci. 2019, 9(15), 3175; https://doi.org/10.3390/app9153175 - 5 Aug 2019
Cited by 7 | Viewed by 3561
Abstract
So far, most of the experimental researchers studying the removal of diesel exhaust pollutants have done so with simulated exhaust gas, which cannot demonstrate the ability of catalysts accurately. Because activated carbon (AC) has low price, no secondary pollution, good adsorption performance, and [...] Read more.
So far, most of the experimental researchers studying the removal of diesel exhaust pollutants have done so with simulated exhaust gas, which cannot demonstrate the ability of catalysts accurately. Because activated carbon (AC) has low price, no secondary pollution, good adsorption performance, and certain catalytic activity, it has good application prospects in the field of marine exhaust pollutant removal. In this paper, the removal of particulate matter (PM), carbon monoxide (CO), and NOx from real exhaust gas by AC was studied. The results show that PM removal efficiency reached up to 77%, while the pressure drop increased with running time. AC may degenerate to some extent with the increase of temperature, resulting in a negative removal efficiency of CO. The denitration efficiency of AC was up to 34.5% without urea, and further increased to 44.8% after spraying urea, still a distance from industrial applications. In the future, it may be necessary to install a fan to compensate the reactor or to backwash the reactor to avoid excessive pressure drop. The thermal stability of the AC also needs to be improved. To increase the denitration performance, it may be helpful to modify the AC or impregnate other metal oxides. Full article
(This article belongs to the Special Issue Air Pollution)
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13 pages, 1824 KiB  
Article
Nitrogen Oxide Removal by Coal-Based Activated Carbon for a Marine Diesel Engine
by Zongyu Wang, Hailang Kuang, Jifeng Zhang, Lilin Chu and Yulong Ji
Appl. Sci. 2019, 9(8), 1656; https://doi.org/10.3390/app9081656 - 22 Apr 2019
Cited by 11 | Viewed by 4196
Abstract
Vanadium-based catalysts are mainly used for marine diesel exhaust denitration. However, their poor catalytic ability at low temperature and poor sulfur tolerance, as well as high toxicity and cost, are big turnoffs. AC (Activated carbon) exhibits good adsorption capacity and catalytic ability in [...] Read more.
Vanadium-based catalysts are mainly used for marine diesel exhaust denitration. However, their poor catalytic ability at low temperature and poor sulfur tolerance, as well as high toxicity and cost, are big turnoffs. AC (Activated carbon) exhibits good adsorption capacity and catalytic ability in denitration because of its high specific surface area and chemical activity. In this paper, coal-based AC was used for simulating diesel exhaust denitration in different conditions. The results show that the NO removal ability of AC is poor in an NO/N2 system. The NO2 removal ability is excellent in an NO2/N2 system, where NO is desorbed. The NOx removal efficiency is 95% when the temperature is higher than 200 °C in an NO2/NH3/N2 system. When the temperature is lower than 100 °C, AC can catalytically oxidize NO to NO2 in an NO2/O2/N2 system. The near-stable catalytic efficiencies of AC for a slow SCR (Selective Catalytic Reduction) reaction, a standard SCR reaction, and a fast SCR reaction at 300 °C are 12.1%, 31.6%, and 70.8%, respectively. When ships use a high-sulfur fuel, AC can be used after wet scrubber desulfurization to catalytically oxidize NO to NO2 at a low temperature. When ships use a low-sulfur fuel, AC can be used as a denitration catalyst at high temperatures. Full article
(This article belongs to the Special Issue Air Pollution)
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