Abstract
Catalytic combustion of propane as typical light alkanes was important for the purification of industrial VOCs and automobile hydrocarbon emissions. Si-doped Al2O3 nanosheet was synthesized by a hydrothermal method, and effects of Si content on the morphology and thermal stability of Al2O3 were investigated. The doping of SiO2 could tune the thickness of Al2O3 nanosheets and significantly improve its thermal stability, the θ phase was still maintained, and the specific surface area was as high as 56.3 m2 g-1 after calcination at 1200 °C. And then the Si-doped Al2O3 nanosheets were used as support of Pd catalysts (Pd/Si-Al2O3 nanosheets) for catalytic combustion of propane, especially Pd/3.6Si-Al2O3 nanosheets, which presented high activity, stability, and resistance to sintering and H2O due to the promotion of Si on the thermal stability of Al2O3 and the stabilization (dispersion, isolation, and strong interaction) of PdOx species.
Highlights
Volatile organic compounds (VOCs) were tightly controlled due to their toxicity and involvement in the formation of photochemical smog, and catalytic combustion was recognized the most efficient technique to eliminate VOCs emission (He et al 2019; Liu et al 2016; Han et al 2017)
The synthesized Al2O3 nanosheet was used as support of PdOx catalyst for catalytic combustion of propane, physicochemical properties of Pd/Si-Al2O3 nanosheets were characterized by X-ray diffraction patterns (XRD), H2-TPR, XPS, CO pulses and in situ CO adsorption DRIFTS, and effects of Si content, high temperature aging and H2O were investigated
Effect of Si doping on morphology and thermal stability of Al2O3 nanosheet
Summary
Volatile organic compounds (VOCs) were tightly controlled due to their toxicity and involvement in the formation of photochemical smog, and catalytic combustion was recognized the most efficient technique to eliminate VOCs emission (He et al 2019; Liu et al 2016; Han et al 2017). Different catalytic materials were employed to investigate the catalytic combustion of propane, Co3O4 and Ru based catalysts were identified as the most active materials for propane oxidation (Wang et al 2019; Hu et al 2018; Liu et al 2009). Our previous work indicated that phosphorous modified γ-Al2O3 nanosheet presented an enhanced both thermal stability of γ-Al2O3 and resistance to sintering of PdOx, PdOx supported P-modified Al2O3 calcined at 1000°C still exhibited a superior catalytic activity for propane combustion due to the re-dispersion of PdOx particles and the SMSI at high temperature (Wu et al 2014). The synthesized Al2O3 nanosheet was used as support of PdOx catalyst for catalytic combustion of propane, physicochemical properties of Pd/Si-Al2O3 nanosheets were characterized by XRD, H2-TPR, XPS, CO pulses and in situ CO adsorption DRIFTS, and effects of Si content, high temperature aging and H2O were investigated
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