The selective oxidation of ammonia over alumina supported catalysts–experiments and modelling

Jones, James C. Peyton; Pourkashanian, Mohamed; Williams, Alan; Backreedy, R.I.; Darvell, L.I.; Simell, Pekka; Heiskanen, Katja; Kilpinen, Pia

doi:10.1016/j.apcatb.2004.11.013

Cited by 22 publications

(12 citation statements)

References 30 publications

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“…A further increase of the copper loading did not significantly influence the catalytic performance of these catalysts [90,103], while higher calcination temperatures of 700-900C resulted in a significant decrease of the catalytic performance [36,119,127]. Besides copper loading and calcination temperature, precursor selection and preparation method were reported to influence the final copper oxide species.…”

Section: Copper Oxidesmentioning

confidence: 94%

“…Above 327C (NH4)2SO4 decomposed to produce SO2 followed by oxidation of NH3 to N2 and small amounts of NO [189]. Jones et al [127] reported an increasing ammonia conversion over (10.0 wt.%)Cu/Al2O3 in the presence of H2S in the gas mixture at 700C, with excellent selectivity to N2. Moreover, also for Cu/SiO2 a significantly improved selectivity to N2 could be observed when adding SO2 to the feed.…”

Section: Effect Of Water Vapour and Sulphur Oxidementioning

confidence: 97%

“…For example by applying Pt/Pd/Cu/SiO2, the selectivity to N2 rose from 39 to 99% by sulphation. Unfortunately, a comprehensive characterization of the investigated materials [127,155,189] was not provided to elucidate the origin of this behaviour. Curtin et al [87] discussed a correlation of the catalytic performance of tested materials to their redox properties.…”

Section: Effect Of Water Vapour and Sulphur Oxidementioning

confidence: 98%

“…Investigations considering the influence of changes of the ammonia to oxygen molar ratio on the catalytic performance were only discussed in a limited number of publications [e.g. 29,70,127]. In general, a decreasing NH3:O2 ratio increased the activity but in parallel decreased the selectivity to N2.…”

Section: Effect Of Oxygen Contentmentioning

confidence: 99%

“…In further studies, many researchers utilized Al2O3 [e.g. 78,118,127,129] or aluminium modified materials [e.g. [122][123][124], zeolites [e.g.…”

Section: Effect Of Acid Sitesmentioning

confidence: 99%

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Copper based catalysts for the selective ammonia oxidation into nitrogen and water vapour—Recent trends and open challenges

Jabłońska

Palkovits

2016

Applied Catalysis B: Environmental

197

172

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Section: Copper Oxidesmentioning

confidence: 94%

Section: Effect Of Water Vapour and Sulphur Oxidementioning

confidence: 97%

Section: Effect Of Water Vapour and Sulphur Oxidementioning

confidence: 98%

Section: Effect Of Oxygen Contentmentioning

confidence: 99%

“…In further studies, many researchers utilized Al2O3 [e.g. 78,118,127,129] or aluminium modified materials [e.g. [122][123][124], zeolites [e.g.…”

Section: Effect Of Acid Sitesmentioning

confidence: 99%

See 3 more Smart Citations

Copper based catalysts for the selective ammonia oxidation into nitrogen and water vapour—Recent trends and open challenges

Jabłońska

Palkovits

2016

Applied Catalysis B: Environmental

197

172

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A new sol‐gel route alumina for selective oxidation of H₂S to sulphur

et al. 2019

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In this study, a new synthesis method was developed for the production of modified sol‐gel alumina (SG‐M) for the selective oxidation of H2S to elemental sulphur. The catalytic activity of this modified alumina without any active metal incorporation was then compared with the activity of commercial alumina (alumina‐com) for H2S selective oxidation. The N2 adsorption‐desorption isotherm showed that the SG‐M alumina synthesized in this work has a mesoporous structure with well‐defined hysteresis loops. Both alumina materials showed a γ‐Al2O3 crystalline phase with an amorphous structure in their crystal structure. The surface acidity of the alumina materials was determined using pyridine‐adsorbed FTIR analyses, and both alumina showed Lewis acid sites on their surfaces. The catalytic activity tests were performed at 250°C using a feed ratio of O2/H2S:0.5. The complete conversion of H2S over SG‐M was achieved during 400 minutes of reaction time. However, the commercial alumina lost its activity at earlier reaction times. Lewis acid sites and surface hydroxyl groups caused the alumina to be active in H2S selective catalytic oxidation, and the formation of Al‐S bonds, observed when the H2S conversion fell, caused a decrease in the catalytic activity of the alumina materials. A high sulphur yield (≥95%) was obtained over SG‐M, even though there was no active metal incorporation and even in the presence of excess oxygen. Considering the catalytic activities, the new sol‐gel alumina synthesized in this work is superior to commercial alumina. It was concluded that, as a catalyst without any active metal, SG‐M is a promising catalyst in H2S selective oxidation to sulphur.

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Catalytic activity of Cu/η-Al2O3 catalysts prepared from aluminum scraps in the NH3-SCO and in the NH3-SCR of NO

Jraba

Makhlouf

Delahay

et al. 2021

Environ Sci Pollut Res

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Copper loaded η-alumina catalysts with different copper contents have been prepared by impregnation/evaporation method. The catalysts were characterized by XRD, FTIR, BET, UV-vis, H 2 -TPR and evaluated in the selective catalytic reduction of NO by NH 3 and in the selective catalytic oxidation of NH 3 . The characterization techniques showed that the impregnation/evaporation method permits to obtain highly dispersed copper oxide species on the η-alumina surface when low amount of copper is used (1wt. % and 2 wt.%). The wet impregnation method made it possible to reach a well dispersion of the copper species on the surface of the alumina for the low copper contents Cu( 1)-Al 2 O 3 and Cu(2)-Al 2 O 3 . The latter justi es the similar behavior of Cu(1)-Al 2 O 3 ) and Cu(2)-Al 2 O 3 in the selective catalytic oxidation of NH 3 where these catalysts exhibit a conversion of NH 3 to N 2 of the order of 100% at T > 500°C.

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The selective oxidation of ammonia over alumina supported catalysts–experiments and modelling

Cited by 22 publications

References 30 publications

Copper based catalysts for the selective ammonia oxidation into nitrogen and water vapour—Recent trends and open challenges

Copper based catalysts for the selective ammonia oxidation into nitrogen and water vapour—Recent trends and open challenges

A new sol‐gel route alumina for selective oxidation of H₂S to sulphur

Catalytic activity of Cu/η-Al2O3 catalysts prepared from aluminum scraps in the NH3-SCO and in the NH3-SCR of NO

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The selective oxidation of ammonia over alumina supported catalysts–experiments and modelling

Cited by 22 publications

References 30 publications

Copper based catalysts for the selective ammonia oxidation into nitrogen and water vapour—Recent trends and open challenges

Copper based catalysts for the selective ammonia oxidation into nitrogen and water vapour—Recent trends and open challenges

A new sol‐gel route alumina for selective oxidation of H2S to sulphur

Catalytic activity of Cu/η-Al2O3 catalysts prepared from aluminum scraps in the NH3-SCO and in the NH3-SCR of NO

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About

A new sol‐gel route alumina for selective oxidation of H₂S to sulphur