Systematic effects of Fe doping on the activity of V2O5/TiO2-carbon nanotube catalyst for NH3-SCR of NOx

Raja, Saur Lumban; Alphin, M. S.

doi:10.1007/s11051-020-04919-2

Cited by 17 publications

(6 citation statements)

References 47 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The system is highly active in the SCR process, but the use of noble metals in nitric acid plants is operationally unfavorable due to the high cost of the catalysts and their low selectivity to N 2 [19][20][21]. Many innovative supports have been proposed in the scientific literature so far, such as acti-vated carbon [22,23], carbon nanotubes [24,25], layered double hydroxides [26,27], layered clays [28][29][30][31], and zeolites [32][33][34][35][36]. Among them, significant attention was paid to zeolites that are microporous aluminosilicate minerals, either naturally occurring or industrially produced on a large scale.…”

Section: Introductionmentioning

confidence: 99%

Modified Zeolite Catalyst for a NOx Selective Catalytic Reduction Process in Nitric Acid Plants

et al. 2021

View full text Add to dashboard Cite

Natural zeolite of the heulandite-type framework was modified with iron and tested as a catalyst for the selective catalytic reduction of nitrogen oxides with ammonia (NH3-SCR) in the temperature range of 150–450 °C. The catalyst was prepared at a laboratory scale in a powder form and then the series of experiments of its shaping into tablets was conducted. Physicochemical studies of the catalyst (N2 sorption at −196 °C, FT-IR, XRD, UV-vis) were performed to determine the textural and structural properties and identify the surface functional groups, the crystalline structure of the catalysts and the form and aggregation of the active phase. The activity tests over the shaped catalyst were performed industry-reflecting conditions, using tail gases from the pilot nitric acid plant. The influence of a temperature, catalyst load, and the amount of reducing agent (ammonia) on the NOx reduction process were investigated. The results of catalytic tests that were performed on model gas mixture showed that non-modified clinoptilolite exhibited around 58% conversion of NO at 450 °C. The temperature window of the shaped catalyst shifted to a higher temperature range in comparison to the powder sample. The catalytic performance of the shaped Fe-clinoptilolite in the industry-reflecting conditions was satisfactory, especially at 450 °C. Additionally, it was observed that the ratio of N2O concentration downstream and upstream of the catalytic bed was below 1, which indicated that the catalyst exhibited activity in both DeNOx and DeN2O process.

show abstract

Section: Introductionmentioning

confidence: 99%

Modified Zeolite Catalyst for a NOx Selective Catalytic Reduction Process in Nitric Acid Plants

et al. 2021

View full text Add to dashboard Cite

show abstract

“…Selective catalytic reduction (SCR) is one of the most efficient methods to remove NO x in the emissions of diesel engine exhaust. [8][9][10][11] SCR can be classified as hydrocarbon-SCR (HC-SCR), oxygenated hydrocarbon-SCR (OHC-SCR), ammonia-SCR (NH 3 -SCR), hydrogen-SCR (H 2 -SCR), and urea-SCR according to the reductant. Among these, HC-SCR and OHC-SCR techniques have been considered as the most promising for NO x reduction due to their low cost, and being environmentally safe.…”

Section: Introductionmentioning

confidence: 99%

“…10,13,17 However, these catalysts have disadvantages such as poor resistance at high temperatures and deactivation in the presence of water vapor. 11 In recent years, silver catalysts supported on alumina (Ag/Al 2 O 3 ) have been widely used for HC-SCR and OHC-SCR due to their low cost and simplicity of preparation. 13,[18][19][20] However, Ag/Al 2 O 3 catalysts have poor activity at low temperatures.…”

Section: Introductionmentioning

confidence: 99%

Investigation of deactivation effect of Au addition to Ce/TiO₂ catalyst for selective catalytic reduction using real diesel engine exhaust samples at low temperature conditions

Keskin

2021

J of Chemical Tech & Biotech

View full text Add to dashboard Cite

BACKGROUND: NO x emissions are very toxic and cause serious adverse environmental effects. NO x reduction technologies have been developed due to the harmful effects of NO x and increasingly stringent emission standards which apply in many countries. Selective catalytic reduction (SCR) is the most effective method of removing NO x from engine exhaust. The suitable active catalysts are important for providing higher NO x conversion efficiencies in the SCR system. Catalyst production methods affect catalytic activity due to change in elemental composition, morphology, dispersion of catalytic elements, and total surface area. In this study, de-NO x performance of Ce/TiO 2 and Au-Ce/TiO 2 catalysts were investigated with real exhaust gases. Tests were carried out within 200-300°C temperature range to evaluate low temperature performance of the catalysts. Cordierite material was used as the support material and pre-treated with hot acid solution to enhance surface area. Ce content of synthesized catalysts with impregnation method was adjusted as 4 wt% and Au content as 0.4, 0.8, and 1.6 wt%. The catalysts were characterized with Scanning Electron Microscope (SEM), Brunauer-Emmett-Teller (BET), X-Ray Diffractometer (XRD), and Fourier transform infrared spectroscopy (FT-IR) analysis. RESULTS: Maximum NO x conversion ratios obtained at 300°C with the Ce/TiO 2 , 0.4 Au-Ce/TiO 2 , 0.8 Au-Ce/TiO 2 , and 1.6 Au-Ce/ TiO 2 catalysts were 95.1%, 92%, 92.6%, and 90.2%, respectively. CONCLUSIONS:The results showed that in general, de-NO x effect of the Ce/TiO 2 catalyst was greater than the Au doped Ce/TiO 2 catalysts. Au addition adversely affected surface properties of the catalyst and therefore activity of the Au-Ce/TiO 2 catalysts decreased.

show abstract

“…Fe-V2O5/TiO2-CNT catalysts also show excellent SCR performance. The NO conversion of the Fe3-V/Ti-C catalyst decreases from 96% to 91% after the addition of SO2 [97]. When SO2 is stopped, the activity recovered to 94% (Figure 20).…”

Section: Fe-mn-ce Catalystsmentioning

confidence: 98%

Sulfur and Water Resistance of Carbon-Based Catalysts for Low-Temperature Selective Catalytic Reduction of NOx: A Review

Shen,

Ren,

Zhang

et al. 2023

Catalysts

View full text Add to dashboard Cite

Low-temperature NH3-SCR is an efficient technology for NOx removal from flue gas. The carbon-based catalyst designed by using porous carbon material with great specific surface area and interconnected pores as the support to load the active components shows excellent NH3-SCR performance and has a broad application prospect. However, overcoming the poor resistance of H2O and SO2 poisoning for carbon-based catalysts remains a great challenge. Notably, reviews on the sulfur and water resistance of carbon-based low-temperature NH3-SCR catalysts have not been previously reported to the best of our knowledge. This review introduces the reaction mechanism of the NH3-SCR process and the poisoning mechanism of SO2 and H2O to carbon-based catalysts. Strategies to improve the SO2 and H2O resistance of carbon-based catalysts in recent years are summarized through the effect of support, modification, structure control, preparation methods and reaction conditions. Perspective for the further development of carbon-based catalysts in NOx low-temperature SCR is proposed. This study provides a new insight and guidance into the design of low-temperature SCR catalysts resistant to SO2 and H2O in the future.

show abstract

Systematic effects of Fe doping on the activity of V2O5/TiO2-carbon nanotube catalyst for NH3-SCR of NOx

Cited by 17 publications

References 47 publications

Modified Zeolite Catalyst for a NOx Selective Catalytic Reduction Process in Nitric Acid Plants

Modified Zeolite Catalyst for a NOx Selective Catalytic Reduction Process in Nitric Acid Plants

Investigation of deactivation effect of Au addition to Ce/TiO₂ catalyst for selective catalytic reduction using real diesel engine exhaust samples at low temperature conditions

Sulfur and Water Resistance of Carbon-Based Catalysts for Low-Temperature Selective Catalytic Reduction of NOx: A Review

Contact Info

Product

Resources

About

Systematic effects of Fe doping on the activity of V2O5/TiO2-carbon nanotube catalyst for NH3-SCR of NOx

Cited by 17 publications

References 47 publications

Modified Zeolite Catalyst for a NOx Selective Catalytic Reduction Process in Nitric Acid Plants

Modified Zeolite Catalyst for a NOx Selective Catalytic Reduction Process in Nitric Acid Plants

Investigation of deactivation effect of Au addition to Ce/TiO2 catalyst for selective catalytic reduction using real diesel engine exhaust samples at low temperature conditions

Sulfur and Water Resistance of Carbon-Based Catalysts for Low-Temperature Selective Catalytic Reduction of NOx: A Review

Contact Info

Product

Resources

About

Investigation of deactivation effect of Au addition to Ce/TiO₂ catalyst for selective catalytic reduction using real diesel engine exhaust samples at low temperature conditions