Novel synthesis of MeO (Ni, Cu, La)@Nano-CoO from combination of complexation and impregnation in ultrasonic intervention for low temperature oxidation of toluene under microwave radiation.

PAPER pubmed Ultrasonics sonochemistry 2018 Engineering / measurement Effect: benefit Evidence: Insufficient

Read original paper → DOI: 10.1016/j.ultsonch.2017.07.047 PMID: 28946456 Evidence Lab

Abstract

Nano-metal binary oxides were prepared by the combined method of complexation and impregnation in ultrasonic intervention for low temperature catalytic oxidation of toluene under microwave radiation. Activity differences of prepared samples were evaluated using the removal rate and the mineralization rate as assessment criteria. Results show that the sample derived from the introduction of La and intervention of ultrasonic presents the best catalytic performance, which the removal rate of 80% can be obtained at 120°C and the mineralization rate of 97% can be obtained at 210°C. Compared with the worst sample at low temperature, maximum increases of removal rate and mineralization rate using the sample of La-Co (US) are 3.47 and 11.79 times respectively. Lowest values of T based on removal rate and mineralization rate are 140°C and 195°C, respectively. Compared with the sample that ultrasonic treatment is not applied in impregnation process, maximum increases of removal rate and mineralization rate using the sample of La-Co (US) are 17.43% and 85.19% respectively. Moreover, Diagrams of XRD, EDX and TEM indicate that metal binary oxides nano-particles are synthesized successfully. The data of SEM and XPS manifests that the sample of La-Co (US) possesses the smallest particle size distribution, the highest levels of the Co/Co and the O/O. In addition, significant differences of catalytic activities are not observed after three cycles indicating that the sample possesses good stability and recycling.

AI evidence extraction

At a glance

Study type

Engineering / measurement

Effect direction

benefit

Population

—

Sample size

—

Exposure

microwave

Evidence strength

Insufficient

Confidence: 74% · Peer-reviewed: yes

Main findings

Nano-metal binary oxide catalysts prepared with La introduction and ultrasonic intervention showed the best performance for low-temperature toluene oxidation under microwave radiation, achieving 80% removal at 120°C and 97% mineralization at 210°C. Compared with lower-performing samples and with non-ultrasonic impregnation, the La-Co (US) sample showed higher removal and mineralization rates and maintained catalytic activity over three cycles.

Outcomes measured

Catalytic oxidation of toluene (removal rate)
Mineralization rate
Catalyst stability/recycling over cycles
Material characterization (XRD, EDX, TEM, SEM, XPS)

View raw extracted JSON

{
    "study_type": "engineering",
    "exposure": {
        "band": "microwave",
        "source": null,
        "frequency_mhz": null,
        "sar_wkg": null,
        "duration": null
    },
    "population": null,
    "sample_size": null,
    "outcomes": [
        "Catalytic oxidation of toluene (removal rate)",
        "Mineralization rate",
        "Catalyst stability/recycling over cycles",
        "Material characterization (XRD, EDX, TEM, SEM, XPS)"
    ],
    "main_findings": "Nano-metal binary oxide catalysts prepared with La introduction and ultrasonic intervention showed the best performance for low-temperature toluene oxidation under microwave radiation, achieving 80% removal at 120°C and 97% mineralization at 210°C. Compared with lower-performing samples and with non-ultrasonic impregnation, the La-Co (US) sample showed higher removal and mineralization rates and maintained catalytic activity over three cycles.",
    "effect_direction": "benefit",
    "limitations": [],
    "evidence_strength": "insufficient",
    "confidence": 0.7399999999999999911182158029987476766109466552734375,
    "peer_reviewed_likely": "yes",
    "keywords": [
        "microwave radiation",
        "ultrasonic intervention",
        "catalyst synthesis",
        "nano-metal binary oxides",
        "La-Co",
        "toluene oxidation",
        "removal rate",
        "mineralization rate"
    ],
    "suggested_hubs": []
}

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