Intrinsic catalytic properties of extruded clay honeycomb monolith toward complete oxidation of air pollutants

Assebban, Mhamed; Kasmi, Achraf El; Harti, Sanae; Chafik, Tarik

doi:10.1016/j.jhazmat.2015.07.067

Cited by 30 publications

(16 citation statements)

References 87 publications

(82 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Acetone. Among the oxygenates, appears as very reactive with a T50 of 228°C, that is 33°C lower than the lightoff temperature of the alcohols tested by Assebban et al [151]. Acetone combustion was studied over spinels Ethanol.…”

Section: Oxygenatesmentioning

confidence: 96%

See 1 more Smart Citation

Transition metal oxides for combustion and depollution processes

Bion¹,

Can²,

Courtois³

et al. 2018

Metal Oxides in Heterogeneous Catalysis

View full text Add to dashboard Cite

Transition metal oxides (M = Mn, Co, Fe, Ni,…) are potential catalysts for application in combustion and depollution processes. Owing to huge improvements in their preparation, perovskites, spinels, hexaaaluminates and some other oxide structures can replace noble metals in a number of processes. In this chapter, the most recent advances in the use of oxides for total oxidation (CO, methane, COV, wet air oxidation) and for the treatment of nitrogen compounds (NOx, NH3, urea) will be reviewed. In every case, the most probable mechanism (Langmuir-Hinshelwood, Eley-Rideal, Mars-van Krevelen,…) and the nature of active sites (M n+ /M n+1 ion pairs, acid-base sites,…) as well as the role of reactive oxygen species will be examined in the light of recent results and up-to-date concepts. Finally the outstanding progresses in the oxide synthesis allow to apply these concepts to the development of extremely active and more stable catalysts.

show abstract

Section: Oxygenatesmentioning

confidence: 96%

“…Aldehydes are the main reaction intermediate of alcohol oxidation (formaldehyde, acetaldehyde, propanal, butanal in oxidation of methanol, ethanol, propanol, butanol, respectively). From ref [151]…”

mentioning

confidence: 99%

Transition metal oxides for combustion and depollution processes

Bion¹,

Can²,

Courtois³

et al. 2018

Metal Oxides in Heterogeneous Catalysis

View full text Add to dashboard Cite

show abstract

“…FA was commonly taken as an adsorbent for the capture of mercury and FA were found to enhance Hg 0 adsorption because of their significant catalytic effect [7] [8]. Clays and the modified clays have been used as adsorbents and catalyst supports for treating waste gas [9].…”

Section: Introductionmentioning

confidence: 99%

Removal Hg<sup>0</sup> from Flue Gas with Modified VTSS by KBr and KI

Shi¹,

Li²

2015

MSCE

View full text Add to dashboard Cite

Vanadium titanium steel slag (VTSS) containing transition metal can promote the adsorption of Hg 0. The method of KBr and KI impregnation was applied to modify VTSS and the properties of the adsorbents were tested. The Hg 0 removal tests were carried out with a fixed bed under different conditions. The results showed that the Hg 0 adsorption capacity increase with the increasing temperature. The efficiency was highest with KI(3)/VTSS at 200˚C and adsorption capacity was 163.4 ug/g after 3 h. The highest Hg 0 removal efficiency were 90.6% for KI(3)/VTSS, 73.5% for KBr(10)/VTSS/ VTSS at 120˚C, respectively.

show abstract

“…The presence of Ga 2 O 3 on the surface means that a greater number of active sites are available, favoring oxidation reactions. [29][30][31][32] It is clear from Table 2 that the conversion was higher for MS-Ga7% since this catalyst had a higher specific surface area and pore volume. The specific surface area decreased with an increase in the gallium content, but this did not appear to influence the fact that MS-Ga 11% showed lower activity.…”

mentioning

confidence: 99%

“…Oxygen migration across the catalyst surface is essential in oxidation reactions, where the oxidation-reduction cycles determine the activity of the catalyst. 3,6,10,15,30,[34][35][36][37] It is well known that the oxidation of hydrocarbons can proceed via the Mars-van Krevelen mechanism in which the substrate is oxidized by the solid. Thus, the key steps are the supply of oxygen by the reducible oxide, the introduction of the oxygen species of the lattice oxide into the substrate molecule, and the re-oxidation of the reduced solid by the oxygen-containing gaseous phase, which is the rate-determining step of the reaction.…”

mentioning

confidence: 99%

Gallium-Containing Mesoporous Silica: Supported Catalysts with High Catalytic Activity for Oxidation of Benzene, Toluene ando-Xylene

Schwanke¹,

Pergher²,

Probst³

et al. 2016

Journal of the Brazilian Chemical Society

View full text Add to dashboard Cite

Benzene, toluene and xylene (BTX) are a particular class of volatile organic compounds, which are highly toxic pollutants. In this study, samples of gallium-containing mesoporous silica (MS-Ga7% and MS-Ga11%) were synthesized and their catalytic activity in the oxidation of BTX was investigated. The physicochemical characterization shows that the inclusion of gallium in the mesoporous silica structure leads to an increase in the number of oxygen vacancies in the structure of the MS-Ga system, which can result in an increase in the total and surface oxygen mobility. The results show the highest conversion for benzene (65%), with > 40% for toluene and > 28% for o-xylene. The high catalytic activity observed was attributed to a combination of several factors including a higher number of active sites (gallium and gallium oxide) being exposed, with a greater mobility of the active oxygen species on the surface of the catalyst promoting the catalytic activity. Keywords: gallium, mesoporous silica, catalytic oxidation, BTX IntroductionThe emission of high levels of volatile organic compounds (VOC) to the atmosphere during various industrial and commercial processes is considered detrimental to human health and the environment. [1][2][3][4][5][6] Benzene, toluene and xylene (BTX) are volatile organic compounds used as common solvents as well as raw materials in the production of other chemicals. [7][8][9] All three substances are known to be toxic. 10,11 Several VOC removal technologies, such as flame combustion, catalytic combustion, catalytic destruction using ozone and plasma, photocatalytic decomposition, adsorption processes and biological treatment, have been developed to eliminate VOCs. 2,6,[12][13][14] Catalytic oxidation is considered to be the most effective approach, mainly due to its high efficiency in the degradation to carbon dioxide and water, even in effluents with low concentrations of VOCs, and low energy cost.3,15 However, it is extremely difficult to achieve the complete combustion of VOCs at low temperatures. Thus, it is important to develop a novel active catalyst which can promote complete oxidation at the lowest possible temperatures. Conventional catalysts are supported on inorganic materials such as alumina and other metal oxides.However, the success of the catalyst is dependent on the nature of the support used. Common catalyst supports include activated carbons, silica, alumina, polymers and zeolites. Mesoporous silicas (MSs), for instance MCM-41, have been shown to be suitable supports for catalysts. 16,17 These mesoporous materials possess some important properties for catalytic purposes, such as high specific surface area, large pore volume and highly ordered pore structures with narrow pore size distributions, which are dependent on the synthesis chemicals and conditions. 18,19 The synthesis of these materials requires a source of silica, usually commercial, a structure directing agent, a solvent, a mineralizer agent, and these materials have been extensively investigated as promising cat...

show abstract

Intrinsic catalytic properties of extruded clay honeycomb monolith toward complete oxidation of air pollutants

Cited by 30 publications

References 87 publications

Transition metal oxides for combustion and depollution processes

Transition metal oxides for combustion and depollution processes

Removal Hg<sup>0</sup> from Flue Gas with Modified VTSS by KBr and KI

Gallium-Containing Mesoporous Silica: Supported Catalysts with High Catalytic Activity for Oxidation of Benzene, Toluene ando-Xylene

Contact Info

Product

Resources

About

Intrinsic catalytic properties of extruded clay honeycomb monolith toward complete oxidation of air pollutants

Cited by 30 publications

References 87 publications

Transition metal oxides for combustion and depollution processes

Transition metal oxides for combustion and depollution processes

Removal Hg&lt;sup&gt;0&lt;/sup&gt; from Flue Gas with Modified VTSS by KBr and KI

Gallium-Containing Mesoporous Silica: Supported Catalysts with High Catalytic Activity for Oxidation of Benzene, Toluene ando-Xylene

Contact Info

Product

Resources

About

Removal Hg<sup>0</sup> from Flue Gas with Modified VTSS by KBr and KI