Assessment the activity of magnetic KOH/Fe3O4@Al2O3 core–shell nanocatalyst in transesterification reaction: effect of Fe/Al ratio on structural and performance

Recently, biodiesel production using heterogeneous catalysts has been of great concern. However, simple separation of these catalysts from product mixtures is a problem of the process. In this study, series of magnetic KOH/Fe 3 O 4 @Al 2 O 3 core–shell nanocatalysts were synthesized via the incipien...

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Veröffentlicht in:Environmental science and pollution research international 2018-11, Vol.25 (32), p.32811-32821
Hauptverfasser: Kazemifard, Sina, Nayebzadeh, Hamed, Saghatoleslami, Naser, Safakish, Ebrahim
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container_issue 32
container_start_page 32811
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creator Kazemifard, Sina
Nayebzadeh, Hamed
Saghatoleslami, Naser
Safakish, Ebrahim
description Recently, biodiesel production using heterogeneous catalysts has been of great concern. However, simple separation of these catalysts from product mixtures is a problem of the process. In this study, series of magnetic KOH/Fe 3 O 4 @Al 2 O 3 core–shell nanocatalysts were synthesized via the incipient wetness impregnation method and the effect of weight ratio of Fe 3 O 4 -to-Al 2 O 3 (0.15–0.35) on the catalytic performance was assessed. The samples were characterized by XRD, FTIR, BET-BJH, VSM, SEM, TEM, and EDX analyses and their basicity was measured by the Hammett indicator method. The results revealed that although the magnetic KOH/Fe 3 O 4 @Al 2 O 3 nanocatalyst with 25 wt% of Fe 3 O 4 showed less activity as compared to those with 15 wt% of Fe3O4, it exhibited higher surface area and appropriate magnetic properties. The sample presented superparamagnetic properties with the magnetic strength of 1.25 emu/g that was simply recovered by using an external magnetic field. The nanocatalyst converted 98.8% of canola oil to biodiesel under reflux condition at the best operational conditions of 12 M ratio of methanol/oil, 4 wt% of catalyst and 6 h of reaction time. Moreover, the nanocatalyst showed high reusability such that it was reused several times without appreciable loss of its catalytic activity.
doi_str_mv 10.1007/s11356-018-3249-7
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However, simple separation of these catalysts from product mixtures is a problem of the process. In this study, series of magnetic KOH/Fe 3 O 4 @Al 2 O 3 core–shell nanocatalysts were synthesized via the incipient wetness impregnation method and the effect of weight ratio of Fe 3 O 4 -to-Al 2 O 3 (0.15–0.35) on the catalytic performance was assessed. The samples were characterized by XRD, FTIR, BET-BJH, VSM, SEM, TEM, and EDX analyses and their basicity was measured by the Hammett indicator method. The results revealed that although the magnetic KOH/Fe 3 O 4 @Al 2 O 3 nanocatalyst with 25 wt% of Fe 3 O 4 showed less activity as compared to those with 15 wt% of Fe3O4, it exhibited higher surface area and appropriate magnetic properties. The sample presented superparamagnetic properties with the magnetic strength of 1.25 emu/g that was simply recovered by using an external magnetic field. The nanocatalyst converted 98.8% of canola oil to biodiesel under reflux condition at the best operational conditions of 12 M ratio of methanol/oil, 4 wt% of catalyst and 6 h of reaction time. Moreover, the nanocatalyst showed high reusability such that it was reused several times without appreciable loss of its catalytic activity.</abstract><cop>Berlin/Heidelberg</cop><pub>Springer Berlin Heidelberg</pub><doi>10.1007/s11356-018-3249-7</doi><tpages>11</tpages><orcidid>https://orcid.org/0000-0001-9813-5189</orcidid></addata></record>
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subjects Aluminum oxide
Aquatic Pollution
Atmospheric Protection/Air Quality Control/Air Pollution
Basicity
Biodiesel fuels
Biofuels
Canola oil
Catalysis
Catalysts
Catalytic activity
Diesel
Earth and Environmental Science
Ecotoxicology
Environment
Environmental Chemistry
Environmental Health
Environmental science
Iron oxides
Magnetic fields
Magnetic properties
Moisture content
Nanocatalysis
Reaction time
Research Article
Transesterification
Waste Water Technology
Water Management
Water Pollution Control
Weight
title Assessment the activity of magnetic KOH/Fe3O4@Al2O3 core–shell nanocatalyst in transesterification reaction: effect of Fe/Al ratio on structural and performance
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