A Ce–Cu–Ti oxide catalyst for the selective catalytic reduction of NO with NH3

Gao, Xiang; Du, Xuesen; Cui, Liwen; Fu, Yincheng; Luo, Zhongyang; Cen, Kefa

doi:10.1016/j.catcom.2010.09.029

Cited by 139 publications

(49 citation statements)

References 22 publications

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“…And selective catalytic reduction (SCR) process is seen as the most promising process for control NOx emissions from stationary sources such as coal-fired power plants [5,6]. Nowadays, commercial vanadia-based catalysts have been put into wide application and showed high activity in the temperature range of 300-400°C [6][7][8], but the drawbacks of vanadia-based catalyst such as toxicity, high oxidation activity of SO 2 to SO 3 , low selectivity and the deactivation by dust raise a request to develop a new kind of SCR catalyst with high activity at low temperature range of the flue gas (e.g.…”

Section: Introductionmentioning

confidence: 99%

A comparative study of the poisoning effect of Zn and Pb on Ce/TiO2 catalyst for low temperature selective catalytic reduction of NO with NH3

Guo

Pan

et al. 2015

Catalysis Communications

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Section: Introductionmentioning

confidence: 99%

A comparative study of the poisoning effect of Zn and Pb on Ce/TiO2 catalyst for low temperature selective catalytic reduction of NO with NH3

Guo

Pan

et al. 2015

Catalysis Communications

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“…Figure 4(a) shows the H 2 -TPR profiles of the bare CeO 2 and gold-supported catalysts. Bare CeO 2 exhibits a wide peak from 250 to 530 °C , which is due to the stepwise reduction of Ce 4+ to Ce 3+ on the surface of the CeO 2 nanoparticles, while bulk CeO 2 reduction occurs above 530 °C [25,26]. After calibration of the hydrogen-consumption peak, the number of hydrogen molecules consumed between 100 to 250 °C is higher than those of Au(III) species, assuming that all gold atoms produced by freeze drying in these catalysts are Au(III), which indicates that the addition of Au may decrease the reduction temperature of Ce 4+ and thereafter facilitate the reduction of surface Ce 4+ ions.…”

Section: Resultsmentioning

confidence: 99%

Supported single Au(III) ion catalysts for high performance in the reactions of 1,3-dicarbonyls with alcohols

et al. 2016

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The high cost and poor atom utilization efficiency of noble metal catalysts have limited their industrial applications. Herein, we designed CeO 2 -supported single Au(III) ion catalysts with ultra-low gold loading that can enhance the utilization efficiency of gold atoms and bridge the gap between homogeneous and heterogeneous gold catalysis. These catalysts were highly active and reusable for the reaction of 1,3-dicarbonyls with alcohols. The catalytic turnover number of CeO 2 -supported single Au(III) ion catalysts was much higher than that of the homogeneous catalyst NaAuCl 4 . In addition, the effects of gold loading and the drying method for the catalysts on the organic reactions were systematically explored. In-depth investigation of the structure-property relationship by highresolution transmission electron microscopy, hydrogen temperature-programmed reduction, X-ray absorption near edge structure analysis, UV-vis diffuse reflectance spectroscopy, and X-ray photoelectron spectroscopy revealed that the isolated Au(III) ions were related to the active sites for the synthesis of β-substituted cyclohexenone and that CeO 2 was responsible for yielding ketonic ester.

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“…In the case of 8 % CuO supported on 20 % CeO 2 -Al 2 O 3 catalyst, the NO conversion reaches the X NO =1 value at a relatively low temperature (T=613 K), and retains it for about two hours on stream, where the SO 2 adsorption capacity is getting close to zero (Figure 9). The above observations can be explained by taking into account the sulfation reactions that are assumed to take place on the sorbents consisting of ceria and copper oxide on alumina (Akyurtlu et al, 1999) As reported, (Gao et al, 2010;Du et al, 2012) the formation of surface sulfate will increase the acid number and NH 3 adsorption thus enhancing the SCR activity. In accordance to the literature (Pantazis et al, 2006), copper oxide supported on ceria-alumina catalysts get sulfated (CuSO 4 formation), but they don't loose their SCR activity even after 3 hours time on stream.…”

Section: Catalytic Activity Of Cuo/al 2 O 3 Catalystmentioning

confidence: 99%

“…There are a few studies, which indicate that ceria possesses sufficient activity and selectivity as a catalyst for the reduction of NO with NH 3 at relatively high temperatures used for SO 2 removal (Akyurtlu et al, 1999;Bereketidou et al, 2009;Gao et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

Simultaneous removal of NO and SO2 from combustion fuel gases using supported copper oxide catalysts

2013

Global NEST Journal

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Nitrogen oxide (NO x ) and sulphur dioxide (SO 2 ) emissions produced by the combustion of fuel in stationary sources, such as power stations, industrial heaters or cogeneration plants, cause significant environmental problems. Selective catalytic reduction (SCR) is a well established process for the control of NO x emissions mainly due to its efficiency, selectivity and economics. High removal efficiencies for both NO x and SO 2 can be achieved with the use of copper oxide catalysts, as they act as sorbents for the latter -forming copper sulfate -and catalyze the reduction of the former -to N 2 , in the presence of NH 3 . An added advantage is that these catalysts are relatively easy to be regenerated under reducing conditions. This study examines the deactivation and regeneration procedures of copper oxide catalysts/sorbents that are supported on Al 2 O 3 , SiO 2 , CeO 2 -Al 2 O 3 , in the presence of SO 2 and identifies the appropriate conditions for the simultaneous removal of NO and SO 2 . The results obtained indicate that copper oxide supported on alumina, ceria-alumina and silica carriers, can be used as effective catalysts for the simultaneous removal of NO and SO 2 . Furthermore, they can be easily regenerated with a gas mixture of 1 % NH 3 /Ar at an optimum temperature of 673 K and they retain their initial activity. Thus, the use of regenerative fixed bed catalytic reactor appears as one of the most promising technologies however, further research focusing in new catalytic materials performance is necessary.

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A Ce–Cu–Ti oxide catalyst for the selective catalytic reduction of NO with NH3

Cited by 139 publications

References 22 publications

A comparative study of the poisoning effect of Zn and Pb on Ce/TiO2 catalyst for low temperature selective catalytic reduction of NO with NH3

A comparative study of the poisoning effect of Zn and Pb on Ce/TiO2 catalyst for low temperature selective catalytic reduction of NO with NH3

Supported single Au(III) ion catalysts for high performance in the reactions of 1,3-dicarbonyls with alcohols

Simultaneous removal of NO and SO2 from combustion fuel gases using supported copper oxide catalysts

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