Catalysis
Magnetic Cu-on-pumice catalyst for nitro reductions
Open access · cc by · source: Europe PMC
A cellulose-textured volcanic-pumice magnetite composite bearing copper nanoparticles reduces nitrobenzenes to anilines in eight minutes.
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
Structured fields used in claim comparison tables when every cited study has a complete layer.
Key findings
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.
Methodology
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.
Limitations
Industrial scale-up, continuous-flow metrics, and a full green-chemistry E-factor mass balance are not provided.
How this study connects
Role on claims
Each row is a claim on a concept or method page where this paper supports, challenges, or qualifies the statement. Roles are hand-checked — not a model guess.
SEM/EDX of a volcanic-pumice magnetic Cu catalyst sits in a characterisation suite with XRD, TGA, BET and XPS. 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 with gradual activity loss. SEM does not supply an E-factor or continuous-flow metric.
Evidence for the claim as stated.
A magnetic Cu-on-pumice catalyst lists TGA among FT-IR, SEM, EDX, XRD, VSM, BET and XPS. The numbers that are actually reported are a working recipe and texture: 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 with gradual activity loss. TGA is supporting composition/stability characterisation, not the catalytic clock.
Evidence for the claim as stated.
DSC of a curing epoxy and TGA of a filled catalyst are both 'thermal analysis' and are not interchangeable. Kissinger Ea 69.7/88.7 kJ mol⁻¹ and 797–867 J g⁻¹ are heat-flow results on TGDDM/DICY; the pumice paper's TGA is an unquoted mass-loss characterisation beside 0.5164 cm³ g⁻¹ BET and an 8 min nitro reduction. Quoting a cure enthalpy as if it were a TGA ash content is the mix-up.
Evidence for the claim as stated.
Open questions
Tensions this paper is part of
From concept pages' “where studies disagree.” Disagreement means the same question; scope means different assays, populations, or outcomes.
DSC of a curing epoxy and TGA of a filled catalyst are both 'thermal analysis' and are not interchangeable. Kissinger Ea 69.7/88.7 kJ mol⁻¹ and 797–867 J g⁻¹ are heat-flow results on TGDDM/DICY; the pumice paper's TGA is an unquoted mass-loss characterisation beside 0.5164 cm³ g⁻¹ BET and an 8 min nitro reduction. Quoting a cure enthalpy as if it were a TGA ash content is the mix-up.
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