Magnetic Cu-on-pumice catalyst for nitro reductions
A cellulose-textured volcanic-pumice magnetite composite bearing copper nanoparticles reduces nitrobenzenes to anilines in eight minutes.
Source
Highly porous copper-supported magnetic nanocatalysts: made of volcanic pumice textured by cellulose and applied for the reduction of nitrobenzene derivatives
Study at a glance
- Design
- Other — Fe3O4@VPMP/CLS–Cu nanocatalyst for NaBH4 reduction of nitrobenzenes
- N
- Heterogeneous catalysis optimization — no sample N
- Population
- Nitrobenzene derivatives reduced with the magnetic Cu nanocatalyst
- Outcome
- Fast nitroarene reduction with magnetic recovery and reuse
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Inspect source passages
Magnetic Cu-on-pumice catalyst for nitro reductions
These passages occur verbatim in the stored paper text. They support the points listed below; they do not verify every statement in the explanation.
Nitrobenzene derivatives are reduced in 8 minutes.
a magnetic catalytic system using natural-based materials was presented that has the ability to reduce various derivatives of nitrobenzene (NB) in a very short time of 8 minutes.
Optimum conditions used 0.05 g catalyst for 8 min at 70 °C.
From the table, it has been revealed that the optimum conditions were provided by using 0.05 g of the Fe 3 O 4 @VPMP/CLS–Cu catalyst during 8 min of stirring at 70 °C.
What they did
Authors built Fe3O4@VPMP/CLS–Cu from volcanic pumice, cellulose, magnetite, and copper, characterized it (FT-IR, SEM, EDX, XRD, TGA, VSM, BET, XPS), and optimized NaBH4 reductions of nitrobenzene derivatives.
What they found
0.05 g catalyst at 70 °C reduces nitrobenzenes in 8 min. BET pore volume is 0.5164 cm3 g−1. XPS shows Cu0 after reduction; the solid is magnetically recovered and reused, with gradual activity loss.
The limits
What it doesn't show
Industrial scale-up, continuous-flow metrics, and a full green-chemistry E-factor mass balance are not provided.
Key terms
- VPMP
- Volcanic pumice microparticles used as a porous green support.
- Nitrobenzene reduction
- NaBH4-mediated conversion of ArNO2 to anilines on the Cu catalyst.
- VSM
- Vibrating-sample magnetometry of the Fe3O4 core for magnetic recovery.
- CLS
- Cellulose that hydrogen-bonds to pumice OH groups and chelates copper.
- XPS Cu states
- Cu2+/Cu+ in the as-made composite; Cu0 after borohydride reduction.
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Quiz yourself
Nitro reductions finish in about:
Common questions
How fast is nitrobenzene reduced?
About 8 minutes under optimized conditions.
How much catalyst?
0.05 g of Fe3O4@VPMP/CLS–Cu at 70 °C.
Why pumice and cellulose?
Porous natural supports aligned with green chemistry.
How is the catalyst recovered?
With a magnet; activity slowly falls on reuse.
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