Selective catalytic reduction of NO by NH3 over a Ce/TiO2 catalyst

Xu, Wenqing; Yu, Yunbo; Zhang, Changbin; He, Hong

doi:10.1016/j.catcom.2007.12.012

Cited by 313 publications

(149 citation statements)

References 19 publications

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“…For instance, Xu et al 72 reported a novel Ce/TiO 2 catalyst, prepared by a conventional precipitation method, showing high deNO x efficiency and N 2 selectivity from 250 to 400 1C. Afterwards, Gao et al 73,74 investigated the influence of preparation methods (including sol-gel, impregnation and co-precipitation methods) and concluded that the catalyst prepared by the sol-gel method showed the best catalytic performance.…”

Section: Introductionmentioning

confidence: 99%

Environmentally-benign catalysts for the selective catalytic reduction of NO_xfrom diesel engines: structure–activity relationship and reaction mechanism aspects

2014

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Selective catalytic reduction of NO x using NH 3 or hydrocarbons (NH 3 -SCR or HC-SCR) in oxygen-rich exhaust from diesel engines remains a major challenge in environmental catalysis. The development of highly efficient, stable and environmentally-benign catalysts for SCR processes is very important for practical use. In this feature article, the structure-activity relationship of vanadium-free catalysts in the NH 3 -SCR reaction is discussed in detail, including Fe-, Ce-based oxide catalysts and Fe-, Cu-based zeolite catalysts, which is beneficial for catalyst redesign and activity improvement. Based on our research, a comprehensive mechanism contributing to the performance of Ag/Al 2 O 3 in HC-SCR is provided, giving a clue to the design of a catalytic system with high efficiency.

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Section: Introductionmentioning

confidence: 99%

Environmentally-benign catalysts for the selective catalytic reduction of NO_xfrom diesel engines: structure–activity relationship and reaction mechanism aspects

2014

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“…The highest NOx conversion of 88% was gained by Ce0.3/ARM at 300 °C and 90% by Ce0.7/ARM at 350 °C. It can be viewed that red mud-based Ce/ARM catalysts have good performance for denitration in 275-400 °C, which is comparable with Ce/TiO2 (5% Ce-doped) [29] and V2O5/TiO2 catalysts [30].…”

Section: Catalytic Activity Of Ce/armmentioning

confidence: 68%

Preparation and Performance of Modified Red Mud-Based Catalysts for Selective Catalytic Reduction of NOx with NH3

Gong

et al. 2018

Catalysts

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Bayer red mud was selected, and the NH 3 -SCR activity was tested in a fixed bed in which the typical flue gas atmosphere was simulated. Combined with XRF, XRD, BET, SEM, TG and NH 3 -Temperature Programmed Desorption (TPD) characterization, the denitration characteristics of Ce-doped red mud catalysts were studied on the basis of alkali-removed red mud. The results showed that typical red mud was a feasible material for denitration catalyst. Acid washing and calcining comprised the best treatment process for raw red mud, which reduced the content of alkaline substances, cleared the catalyst pore and optimized the particle morphology with dispersion. In the temperature range of 300-400 • C, the denitrification efficiency of calcined acid washing of red mud catalyst (ARM) was more than 70%. The doping of Ce significantly enhanced NH 3 adsorption from weak, medium and strong acid sites, reduced the crystallinity of α-Fe 2 O 3 in ARM, optimized the specific surface area and broadened the active temperature window, which increased the NO x conversion rate by an average of nearly 20% points from 250-350 • C. The denitration efficiency of Ce 0.3 /ARM at 300 • C was as high as 88%. The optimum conditions for the denitration reaction of the Ce 0.3 /ARM catalyst were controlled as follows: Gas Hourly Space Velocity (GHSV) of 30,000 h −1 , O 2 volume fraction of 3.5-4% and the NH 3 /NO molar ratio ([NH 3 /NO]) of 1.0. The presence of SO 2 in the feed had an irreversible negative effect on the activity of the Ce 0.3 /ARM catalyst.

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“…In our previous study, Xu et al [30] developed a promising CeO2/TiO2 catalyst, prepared [17], and (C) Mn/TiO2 [19] catalysts. Reaction conditions: (A) 500 mg sample, 500 ppm NO, 500 ppm NH3, 3% O2, N2 as balance gas, GHSV = 28 000 h −1 ; (B) 20 mg sample (0.025 mL), 2000 ppm NO, 2000 ppm NH3, 3% O2, balance He, total flow rate 138.3 mL/min, GHSV = 332 000 h −1 ; (C) 2 mL sample, 1000 ppm NO, 1000 ppm NH3, 3% O2, 3% water, balance N2, GHSV = 40 000 h −1 .…”

Section: Ceria As the Main Active Component For Nh3-scr Catalystsmentioning

confidence: 99%

The use of ceria for the selective catalytic reduction of NOx with NH3

Shan

Liu

et al. 2014

Chinese Journal of Catalysis

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125

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The selective catalytic reduction of NOx with NH3 (NH3-SCR) is one of the widely used NOx control strategies for stationary sources (particularly for power plants) and mobile sources (particularly for diesel vehicles). The application is aimed at meeting the increasingly stringent standards for NOx emissions. Recently, ceria has attracted much attention for its applications in NH3-SCR catalysts owing to its unique redox, oxygen storage, and acid-base properties. In this article, we comprehensively review recent studies on ceria for NH3-SCR catalysts when used as support, promoter, or the main active component. In addition, the general development of ceria for NH3-SCR catalysts is discussed.

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Selective catalytic reduction of NO by NH3 over a Ce/TiO2 catalyst

Cited by 313 publications

References 19 publications

Environmentally-benign catalysts for the selective catalytic reduction of NO_xfrom diesel engines: structure–activity relationship and reaction mechanism aspects

Environmentally-benign catalysts for the selective catalytic reduction of NO_xfrom diesel engines: structure–activity relationship and reaction mechanism aspects

Preparation and Performance of Modified Red Mud-Based Catalysts for Selective Catalytic Reduction of NOx with NH3

The use of ceria for the selective catalytic reduction of NOx with NH3

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Selective catalytic reduction of NO by NH3 over a Ce/TiO2 catalyst

Cited by 313 publications

References 19 publications

Environmentally-benign catalysts for the selective catalytic reduction of NOxfrom diesel engines: structure–activity relationship and reaction mechanism aspects

Environmentally-benign catalysts for the selective catalytic reduction of NOxfrom diesel engines: structure–activity relationship and reaction mechanism aspects

Preparation and Performance of Modified Red Mud-Based Catalysts for Selective Catalytic Reduction of NOx with NH3

The use of ceria for the selective catalytic reduction of NOx with NH3

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Environmentally-benign catalysts for the selective catalytic reduction of NO_xfrom diesel engines: structure–activity relationship and reaction mechanism aspects

Environmentally-benign catalysts for the selective catalytic reduction of NO_xfrom diesel engines: structure–activity relationship and reaction mechanism aspects