Mounir SAKMECHE | University of Sciences and Technology-Oran- Mohamed Boudiaf (USTOMB). (original) (raw)
Mounir Sakmeche currently works at the Département of Chemical engineering, Université des Sciences et de la Technologie d'Oran Mohamed Boudiaf. Mounir does research in Catalysis, Environmental Chemistry and Inorganic Chemistry
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The selective catalytic reduction of NO with CH 4 over functionalized AlMCM-41 has been studied. ... more The selective catalytic reduction of NO with CH 4 over functionalized AlMCM-41 has been studied. Factors such as platinum rate exchange (0.5–4.0 wt %), temperature (10 0–80 0 °C), GHSV (80 0 0–16,0 0 0 h-1) and CH 4 /O 2 ratio (0.25–2.0) have been investigated. The highest NO reduction rate was found at a sto-ichiometric ratio of CH 4 /NO ∼ = 2, T ≈350 °C, 2.5 wt% of platinum and a GHSV of 12,0 0 0 h-1. The rate of intermediate N 2 O reduction is minimal at high CH 4 pressures. The reaction product suggests a short NO 2 lifetime. The NO/NO 2 oxidation/reduction cycle delays NO reduction to N 2 until all O 2 is consumed under helium flow. For Pt(X)-catalysts, the NO maximum conversion depends on the factors mentioned above and on aging steam. Then, for high oxygen concentrations (at 350 °C), catalyst Pt (2.5 wt%)-H-AlMCM-41 shows a good NO reduction. The presence of Pt ions, oxidation states and their uniform dispersion within the catalysts affect positively this reaction. It was observed that the specific catalytic behaviors of the prepared materials sharply decreased when O 2 increased with a steam aging temperature ≥600 °C. Studied factors induced the formation of octahedral aluminum due to a dealumination phenomenon that leads to a structural collapse and a loss of activity.
The selective catalytic reduction of NO with CH 4 over functionalized AlMCM-41 has been studied. ... more The selective catalytic reduction of NO with CH 4 over functionalized AlMCM-41 has been studied. Factors such as platinum rate exchange (0.5–4.0 wt %), temperature (10 0–80 0 °C), GHSV (80 0 0–16,0 0 0 h-1) and CH 4 /O 2 ratio (0.25–2.0) have been investigated. The highest NO reduction rate was found at a sto-ichiometric ratio of CH 4 /NO ∼ = 2, T ≈350 °C, 2.5 wt% of platinum and a GHSV of 12,0 0 0 h-1. The rate of intermediate N 2 O reduction is minimal at high CH 4 pressures. The reaction product suggests a short NO 2 lifetime. The NO/NO 2 oxidation/reduction cycle delays NO reduction to N 2 until all O 2 is consumed under helium flow. For Pt(X)-catalysts, the NO maximum conversion depends on the factors mentioned above and on aging steam. Then, for high oxygen concentrations (at 350 °C), catalyst Pt (2.5 wt%)-H-AlMCM-41 shows a good NO reduction. The presence of Pt ions, oxidation states and their uniform dispersion within the catalysts affect positively this reaction. It was observed that the specific catalytic behaviors of the prepared materials sharply decreased when O 2 increased with a steam aging temperature ≥600 °C. Studied factors induced the formation of octahedral aluminum due to a dealumination phenomenon that leads to a structural collapse and a loss of activity.
The selective catalytic reduction of NO with CH 4 over functionalized AlMCM-41 has been studied. ... more The selective catalytic reduction of NO with CH 4 over functionalized AlMCM-41 has been studied. Factors such as platinum rate exchange (0.5–4.0 wt %), temperature (10 0–80 0 °C), GHSV (80 0 0–16,0 0 0 h-1) and CH 4 /O 2 ratio (0.25–2.0) have been investigated. The highest NO reduction rate was found at a sto-ichiometric ratio of CH 4 /NO ∼ = 2, T ≈350 °C, 2.5 wt% of platinum and a GHSV of 12,0 0 0 h-1. The rate of intermediate N 2 O reduction is minimal at high CH 4 pressures. The reaction product suggests a short NO 2 lifetime. The NO/NO 2 oxidation/reduction cycle delays NO reduction to N 2 until all O 2 is consumed under helium flow. For Pt(X)-catalysts, the NO maximum conversion depends on the factors mentioned above and on aging steam. Then, for high oxygen concentrations (at 350 °C), catalyst Pt (2.5 wt%)-H-AlMCM-41 shows a good NO reduction. The presence of Pt ions, oxidation states and their uniform dispersion within the catalysts affect positively this reaction. It was observed that the specific catalytic behaviors of the prepared materials sharply decreased when O 2 increased with a steam aging temperature ≥600 °C. Studied factors induced the formation of octahedral aluminum due to a dealumination phenomenon that leads to a structural collapse and a loss of activity.
The selective catalytic reduction of NO with CH 4 over functionalized AlMCM-41 has been studied. ... more The selective catalytic reduction of NO with CH 4 over functionalized AlMCM-41 has been studied. Factors such as platinum rate exchange (0.5–4.0 wt %), temperature (10 0–80 0 °C), GHSV (80 0 0–16,0 0 0 h-1) and CH 4 /O 2 ratio (0.25–2.0) have been investigated. The highest NO reduction rate was found at a sto-ichiometric ratio of CH 4 /NO ∼ = 2, T ≈350 °C, 2.5 wt% of platinum and a GHSV of 12,0 0 0 h-1. The rate of intermediate N 2 O reduction is minimal at high CH 4 pressures. The reaction product suggests a short NO 2 lifetime. The NO/NO 2 oxidation/reduction cycle delays NO reduction to N 2 until all O 2 is consumed under helium flow. For Pt(X)-catalysts, the NO maximum conversion depends on the factors mentioned above and on aging steam. Then, for high oxygen concentrations (at 350 °C), catalyst Pt (2.5 wt%)-H-AlMCM-41 shows a good NO reduction. The presence of Pt ions, oxidation states and their uniform dispersion within the catalysts affect positively this reaction. It was observed that the specific catalytic behaviors of the prepared materials sharply decreased when O 2 increased with a steam aging temperature ≥600 °C. Studied factors induced the formation of octahedral aluminum due to a dealumination phenomenon that leads to a structural collapse and a loss of activity.