NOx SCR by decane and propylene on Pt+Cu/Zr-pillared clays in realistic feeds: Performance and mechanistic features versus structural specificity of nanosized zirconia pillars

Sadykov, Vladіslav; Kuznetsova, T. G.; Доронин, В. П.; Bunina, R. V.; Alikina, G. M.; Batuev, Lubsan; Матышак, В. А.; Rozovskii, A. Ya.; Tret’yakov, V. F.; Burdeynaya, Tatiana; Лунин, В. В.; Ross, J.R.H.

doi:10.1016/j.cattod.2006.02.010

Cited by 13 publications

(10 citation statements)

References 47 publications

(140 reference statements)

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“…He and Dongare also agreed on the enhancement of surface acidity as an effective way to improve the SO 2 -resistance of catalysts. In the study of Pt+Cu/Zr-pillared-clays catalyst, Sadykov et al suggested that the surface sulfation of the catalyst could increase the reactivity of N-containing organics by decreasing the bonding strength and coverage; hence, producing the positive effect on the SCR reaction. There have been some other reports about the SO 2 -tolerance capacity of Cu-loaded catalysts in the HC-SCR reactions, − but the effect of SO 2 on the intermediates, including their generation and transformation, has not been systemically addressed.…”

Section: Introductionmentioning

confidence: 99%

Combined Spectroscopic and Theoretical Approach to Sulfur-Poisoning on Cu-Supported Ti–Zr Mixed Oxide Catalyst in the Selective Catalytic Reduction of NO_x

Liu

Zhao

et al. 2014

ACS Catal.

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The SO 2 -poisoning on a Cu-supported Ti−Zr mixed oxide catalyst (Cu/Ti 0.7 Zr 0.3 O 2−δ ) in selective catalytic reduction (SCR) of NO x with C 3 H 6 was investigated, and the different effects of SO 2 at varying reaction temperatures were clarified by in situ Fourier transform infrared (FTIR) spectroscopy combined with density functional theory (DFT) calculations. In situ FTIR results of the catalyst at low temperatures (150−250 °C) implied that the formation of sulfates on the surface inhibited the activation of NO and C 3 H 6 as well as the reactivity of nitrates and NO 2 . The weakened capacity of the catalyst toward acetate formation is an important reason for the decline of catalytic activity at low temperatures. At high temperatures (above 275 °C), the negative effect of SO 2 on the C 3 H 6 activation to acetate is quite weak. More importantly, the generation of −NCO species is enhanced significantly via the reaction −CN + SO 2 /SO 4 2− → −NCO, which is confirmed by both in situ FTIR experimental observations and DFT calculations. The promotion in the generation of −NCO species is the primary reason for the elevation of SCR activity at high temperatures.

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Section: Introductionmentioning

confidence: 99%

Combined Spectroscopic and Theoretical Approach to Sulfur-Poisoning on Cu-Supported Ti–Zr Mixed Oxide Catalyst in the Selective Catalytic Reduction of NO_x

Liu

Zhao

et al. 2014

ACS Catal.

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“…Further, the pretreatment of the PILC support has also been reported to effectively improve the catalyst reaction activity. Sadykov et al (2006) found that the pre-sulfurization treatment of Cu/Zr-PILC can reduce the combustion of HC on the catalyst surface and slightly influence NOx reduction. The sulfated Pt-Cu/Zr-PILC catalyst was observed to suppress the combustion of the hydrocarbon, thus improving NOx conversion (58%) at low temperatures (200 °C).…”

Section: Influence Of Synthesismentioning

confidence: 97%

“…Further, Lin et al (2003) introduced the rare earth metal La (0.5 wt.%) to Cu/Al-PILC catalyst and found that the La promoter could help to improve the dispersion of Cu species on the catalyst surface and improve the heat resistance of the catalyst. Furthermore, Sadykov et al (2006) examined the addition of a small amount of noble metal Pt (0.3~0.5 wt.%) in the Cu/Zr-PILC catalyst and noticed that the small addition of Pt (0.5 wt.%) can improve the low-temperature SCR activity of PILC-based catalyst. This suggests that Pt is located on zirconia nanopillars that are partially collated with Cu cations.…”

Section: Effect Of Metals and Their Loadingmentioning

confidence: 99%

“…When the C3H6 concentration is higher than the critical value (~0.24%), HC could burn violently on the surface of the catalyst and can release massive heat, which reduces and deactivates the catalyst activity due to coke deposits on the catalyst surface, meanwhile, it can also destroy the PILC structure. Carbon deposition caused by the burning of HC compounds on the surface of the PILC has often been reported as one of the main reasons for the decrease in SCR activity (Konin et al, 2001;Sadykov et al, 2006).…”

Section: Influence Of Reaction Conditions and Presence Of So2 And H2omentioning

confidence: 99%

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A review on pillared clay-based catalysts for low-temperature selective catalytic reduction of NO with hydrocarbons

Kashif

Heynderickx

et al. 2023

Applied Clay Science

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“…Pillared interlayered clay (PILC) is a kind of excellent catalyst support with good resistance to water vapor and SO 2 , high hydrothermal stability, adjustable pore size, and acidity, which has been widely used to prepare the supported catalysts in SCR-HC research in recent years. , Different metals, such as Cu, Ce, Rh, Co, Ag, Pt, etc, − have been incorporated into these pillared clays in the past 30 years. Yang et al synthesized Ti-PILC catalysts modified with various metal ions (Cu, Fe, Ce, Co, Ag, Ga).…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on SCR-C₃H₆ Over Cu–Fe/Al-PILC Catalysts: Catalytic Performance, Characterization, and Mechanism

Wen

Cheng

et al. 2020

Ind. Eng. Chem. Res.

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The selective catalytic reduction of NO with hydrocarbons (SCR-HC) is currently one of the promising technologies for the control of nitrogen oxides (NO x ). Iron-based catalysts are very promising for the SCR-HC reaction considering both the NO conversion efficiency and low cost as an environmentally friendly metal. However, these Fe-based catalysts showed poor SCR activity below 300 °C. To improve the reactivity of the iron-based catalysts supported on Alumina-pillared clays at lower temperatures, Cu was used to modify the Fe/Al-pillared interlayered clay (PILC) catalysts and the selective catalytic reduction of NO with C3H6 (SCR-C3H6) was investigated at 150–550 °C over xCu–Fe/Al-PILC catalysts (x = 0.11–0.38, x means the molar ratio of Cu/Fe) prepared by the impregnation method. The catalysts were characterized by means of X-ray diffraction (XRD), N2 adsorption–desorption, H2-temperature-programmed reduction (TPR), ultraviolet–visible spectroscopy (UV–vis), X-ray photoelectron spectroscopy (XPS), pyridine-adsorption infrared spectroscopy (Py-FTIR), etc. The results showed that Cu improved the SCR of NO obviously at lower temperatures, e.g., the NO conversion increased from 5 to 44% at 150 °C and from 15 to 93% at 250 °C, respectively, for the original Fe/Al-PILC catalysts and the 0.13Cu–Fe/Al-PILC catalyst. The interaction of copper and iron promoted the dispersion of iron species on the catalyst surface and improved the reduction ability of the iron species at lower temperatures. An appropriate copper–iron molar ratio can promote the dispersion of iron species to obtain a larger specific surface area and pore volume. Cu improved the formation of isolated Fe3+ and Fe2O3 particles, and the former together with the isolated Cu2+ contributed to the reduction performance at low temperatures, while the latter allowed the catalyst to maintain a high NO conversion at high temperatures. Moreover, Cu increased the surface acidity of the catalysts. A possible reaction pathway was proposed based on an in situ diffuse reflectance Fourier transform infrared spectroscopy (in situ DRIFTS) study, where the active species were mainly monodentate nitrates, acetates, and NCO species. Importantly, the introduction of Cu promoted the formation of more of these active species, which were contributed to the activity of C3H6-SCR.

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NOx SCR by decane and propylene on Pt+Cu/Zr-pillared clays in realistic feeds: Performance and mechanistic features versus structural specificity of nanosized zirconia pillars

Cited by 13 publications

References 47 publications

Combined Spectroscopic and Theoretical Approach to Sulfur-Poisoning on Cu-Supported Ti–Zr Mixed Oxide Catalyst in the Selective Catalytic Reduction of NO_x

Combined Spectroscopic and Theoretical Approach to Sulfur-Poisoning on Cu-Supported Ti–Zr Mixed Oxide Catalyst in the Selective Catalytic Reduction of NO_x

A review on pillared clay-based catalysts for low-temperature selective catalytic reduction of NO with hydrocarbons

Experimental Study on SCR-C₃H₆ Over Cu–Fe/Al-PILC Catalysts: Catalytic Performance, Characterization, and Mechanism

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NOx SCR by decane and propylene on Pt+Cu/Zr-pillared clays in realistic feeds: Performance and mechanistic features versus structural specificity of nanosized zirconia pillars

Cited by 13 publications

References 47 publications

Combined Spectroscopic and Theoretical Approach to Sulfur-Poisoning on Cu-Supported Ti–Zr Mixed Oxide Catalyst in the Selective Catalytic Reduction of NOx

Combined Spectroscopic and Theoretical Approach to Sulfur-Poisoning on Cu-Supported Ti–Zr Mixed Oxide Catalyst in the Selective Catalytic Reduction of NOx

A review on pillared clay-based catalysts for low-temperature selective catalytic reduction of NO with hydrocarbons

Experimental Study on SCR-C3H6 Over Cu–Fe/Al-PILC Catalysts: Catalytic Performance, Characterization, and Mechanism

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Combined Spectroscopic and Theoretical Approach to Sulfur-Poisoning on Cu-Supported Ti–Zr Mixed Oxide Catalyst in the Selective Catalytic Reduction of NO_x

Combined Spectroscopic and Theoretical Approach to Sulfur-Poisoning on Cu-Supported Ti–Zr Mixed Oxide Catalyst in the Selective Catalytic Reduction of NO_x

Experimental Study on SCR-C₃H₆ Over Cu–Fe/Al-PILC Catalysts: Catalytic Performance, Characterization, and Mechanism