Selective catalytic reduction

About: Selective catalytic reduction is a research topic. Over the lifetime, 10502 publications have been published within this topic receiving 226291 citations.

Low temperature selective catalytic reduction of NO by activated carbon fiber loading lanthanum oxide and ceria

Abstract: Due to the contribution to air pollution, the controlling of NO discharge needs further studies. In this paper, loaded catalysts of 10–40% (w/w) CeO2/ACF were prepared by impregnation method and used for the selective catalytic reduction of NO with ammonia in the presence of O2. Such catalysts were characterized by surface area measurement (BET), thermo gravimetric (TG) analysis and Fourier transform infrared (FTIR) spectroscopy. The catalytic activity of 10–40% CeO2/ACF at different temperatures, and the catalytic stability at 200 °C were studied. Moreover, the experimental results were compared with those of previous studied catalysts. The results show that the 10% CeO2/ACF and 20% La2O3/ACF can yield higher NO conversion and maintain higher catalytic activity at higher temperature than others. 10% CeO2/ACF yields about 70% NO conversion in the SCR of NO at 150 °C, and meanwhile 20% La2O3/ACF and 10% CeO2/ACF yield over 90% NO conversion when the temperatures are higher than 350 °C. The catalytic activity and the catalyst stability of 10% CeO2/ACF and 20% La2O3/ACF are both higher than those of many reported catalysts. Based on the catalytic and characterizing results, such as BET, TG and FTIR, it can be found that the SCR of NO mechanism of loaded catalysts is different from those of ACF and HNO3/ACF. ACF-C is the catalyst and reducing agent in the SCR of NO of ACF and HNO3/ACF, while the metal oxides loaded by ACF are the catalytic centers, NH3 is the main reducing agent in the SCR of loaded catalysts.

Highly efficient noble metal free copper nickel oxysulfide nanoparticles for catalytic reduction of 4-nitrophenol, methyl blue, and rhodamine-B organic pollutants

Abstract: In this study, novel and noble metal-free copper nickel oxysulfide (CuNiOS) nanoparticles have been successfully fabricated by using a simple, cost-effective, and eco-friendly solution-based approach, with copper oxysulfide (CuOS) as a comparative The CuOS and CuNiOS catalysts with various Ni contents were investigated by different techniques The catalytic activities of the samples were assessed by the catalytic reduction of organic dyes such as 4-nitrophenol (4-NP), methylene blue (MB), and rhodamine-B (RhB) together with NaBH4 in an aqueous solution The results obtained from ultraviolet-visible (UV-vis) spectroscopy indicated that CuNiOS-06 prepared with a Cu : Ni precursor mole ratio of 1 : 06 had the best catalytic performance for the reduction of 4-NP, MB, and RhB in comparison to the other CuNiOS catalysts and the monometallic catalyst (CuOS) due to synergistic effects In addition, the CuNiOS-06 catalyst is also better than other CuNiOS ones due to the presence of optimum amounts of Ni in the CuNiOS sample Thus, the present approach provides a promising way to fabricate different noble metal free bimetallic oxysulfide catalysts for extensive applications in catalysis and reduction/removal of other organic pollutants