A novel mechanism for poisoning of metal oxide SCR catalysts: base–acid explanation correlated with redox properties

Chang, Huazhen; Li, Junhua; Su, Wenkang; Shao, Yuankai; Hao, Jiming

doi:10.1039/c4cc02991g

Cited by 61 publications

(36 citation statements)

References 30 publications

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“…[ 36 ] The peaks at 1770 and 1625 cm −1 could be attributed to the formation of bidentate and carbonate, respectively, and signified a nucleophilic attachment to O 2− clusters. [ 37 ] Unlike Ga 15/ ZSM‐5, however, all peaks disappeared on V 15 /ZSM‐5 by the tenth minute of desorption at 200 °C (Figure 2d). This signified that carbonyl and bidentate bonding to the vanadium oxide centers was weaker than the carbonate bonding in Ga 15 /ZSM‐5 and indicated that V 15 /ZSM‐5 was less basic than Ga 15 /ZSM‐5.…”

Section: Resultsmentioning

confidence: 99%

A Novel Method of 3D Printing High‐Loaded Oxide/H‐ZSM‐5 Catalyst Monoliths for Carbon Dioxide Reduction in Tandem with Propane Dehydrogenation

Lawson

Farsad

Adebayo

et al. 2020

Advanced Sustainable Systems

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Oxidative propane dehydrogenation using CO2 (CO2‐ODHP) is a potential alternative for propylene synthesis. In this study, bifunctional catalysts (V2O5, ZrO2, Cr2O3, and Ga2O3 doped H‐ZSM‐5) are synthesized through additive manufacturing for CO2‐ODHP. Characterization and correlation between the various characterizations and the catalytic results indicates that the direct 3D printing of metal oxides alongside H‐ZSM‐5 can considerably modify the surface properties and bulk oxide phase dispersion, thus leading to enhanced metal oxide reducibility and exceptional CO2‐ODHP performance. Among the metal monoliths, the mixed oxide sample with 5 wt% Cr, 10 wt% V, 10 wt% Zr, 10 wt% Ga and 65 wt% H‐ZSM‐5 displays the best activity, achieving ≈40% propane conversion, 95% propylene selectivity, and zero benzene/toluene/xylene production. Upon eliminating CO2, the catalyst monoliths all retain their long‐term stability; however, the propane conversions decrease by ≈3% and the propylene selectivities decreased by 5–15%. Nevertheless, all five samples examined here demonstrate exceptional catalytic activities and prolonged stabilities, which are attributed to the even distribution of surface acid sites produced by direct printing of the oxide and zeolite components. Overall, this study presents a novel way of manufacturing bifunctional structured catalysts that exhibit exceptional ODHP performance.

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Section: Resultsmentioning

confidence: 99%

A Novel Method of 3D Printing High‐Loaded Oxide/H‐ZSM‐5 Catalyst Monoliths for Carbon Dioxide Reduction in Tandem with Propane Dehydrogenation

Lawson

Farsad

Adebayo

et al. 2020

Advanced Sustainable Systems

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“…The first desorption peak centered at around 120 • C corresponds to the physisorbed NH 3 or weakly acidic sites [34]. The other peak located at around 480 • C can be assigned to the chemical adsorbed ammonia on strong Lewis and Brønsted acidity sites [35]. The amount of total NH 3 adsorption and the proportion for every type of acid site were calculated from the integrated areas of the corresponding peaks.…”

Section: -mentioning

confidence: 99%

NOx Removal by Selective Catalytic Reduction with Ammonia over a Hydrotalcite-Derived NiFe Mixed Oxide

Wang

Zou

et al. 2018

Catalysts

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A series of NiFe mixed oxide catalysts were prepared via calcining hydrotalcite-like precursors for the selective catalytic reduction of nitrogen oxides (NOx) with NH3 (NH3-SCR). Multiple characterizations revealed that catalytic performance was highly dependent on the phase composition, which was vulnerable to the calcination temperature. The MOx phase (M = Ni or Fe) formed at a lower calcination temperature would induce more favorable contents of Fe2+ and Ni3+ and as a result contribute to the better redox capacity and low-temperature activity. In comparison, NiFe2O4 phase emerged at a higher calcination temperature, which was expected to generate more Fe species on the surface and lead to a stable structure, better high-temperature activity, preferable SO2 resistance, and catalytic stability. The optimum NiFe-500 catalyst incorporated the above virtues and afforded excellent denitration (DeNOx) activity (over 85% NOx conversion with nearly 98% N2 selectivity in the region of 210–360 °C), superior SO2 resistance, and catalytic stability.

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“…The selective catalytic reduction of NOx by NH3 (NH3-SCR) is one of the most popular methods for the removal of NOx from stationary sources. Though V2O5-WO3/TiO2 displays excellent activity in NH3-SCR and is the predominantly the main commercial catalyst for this process, many compounds containing alkali/alkali earth metal elements, Pb, Zn, As or Cl are commonly found in flue gas streams, can lead to the de-activation of V2O5-WO3/TiO2 catalysts [1][2][3][4]. In addition to the pre-viously mentioned composite species, SO2 is also a common component of many industrial flue gas streams where the combustion of sulfur-containing fuels occurs.…”

Section: Introductionmentioning

confidence: 99%

The remarkable promotional effect of SO2 on Pb-poisoned V2O5-WO3/TiO2 catalysts: An in-depth experimental and theoretical study

Miao

et al. 2018

Chemical Engineering Journal

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A novel mechanism for poisoning of metal oxide SCR catalysts: base–acid explanation correlated with redox properties

Cited by 61 publications

References 30 publications

A Novel Method of 3D Printing High‐Loaded Oxide/H‐ZSM‐5 Catalyst Monoliths for Carbon Dioxide Reduction in Tandem with Propane Dehydrogenation

A Novel Method of 3D Printing High‐Loaded Oxide/H‐ZSM‐5 Catalyst Monoliths for Carbon Dioxide Reduction in Tandem with Propane Dehydrogenation

NOx Removal by Selective Catalytic Reduction with Ammonia over a Hydrotalcite-Derived NiFe Mixed Oxide

The remarkable promotional effect of SO2 on Pb-poisoned V2O5-WO3/TiO2 catalysts: An in-depth experimental and theoretical study

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