Citation: Amin Talebian-Kiakalaieh, Nor Aishah Saidina Amin. Coke-tolerant SiW₂₀-Al/Zr₁₀ catalyst for glycerol dehydration to acrolein[J]. Chinese Journal of Catalysis, ;2017, 38(10): 1697-1710. doi: 10.1016/S1872-2067(17)62891-2 shu

Coke-tolerant SiW₂₀-Al/Zr₁₀ catalyst for glycerol dehydration to acrolein

Chemical Reaction Engineering Group (CREG), Faculty of Chemical and Energy Engineering, Universiti Teknologi Malaysia (UTM), Skudai 81310, Johor, Malaysia

Received Date: 24 March 2017
Revised Date: 30 June 2017

Glycerol dehydration to acrolein over a series of supported silicotungstic acid catalysts (SiW_x-Al/Zr_y) was investigated. Characterization results showed that the final catalyst had high thermal stability, a large pore diameter, strong Lewis acidic sites, and a large specific surface area. X-ray photoelectron survey spectra clearly showed peaks attributable to W (W 4f = 35.8 eV), Al₂O₃(Al 2p = 74.9 eV), and ZrO₂ (Zr 3d = 182.8 eV). The highest acrolein selectivity achieved was 87.3% at 97% glycerol conversion over the SiW₂₀-Al/Zr₁₀ catalyst. The prepared catalysts were highly active and selective for acrolein formation even after 40 h because of the presence of high concentrations of Lewis acidic sites, which significantly reduced the amount of coke on the catalyst surface. Response surface methodology optimization showed that 87.7% acrolein selectivity at 97.0% glycerol conversion could be obtained under the following optimal reaction conditions: 0.5 wt% catalyst, reaction temperature 300 ℃, and feed glycerol concentration 10 wt%. Evaluation of a mass-transfer-limited regime showed the absence of internal and external diffusions over pellets of diameter d_P<20 μm. These results show that glycerol dehydration over a strong Lewis acid catalyst is a promising method for acrolein production.
- Glycerol,
- Dehydration,
- Acrolein,
- Heterogeneous catalysis,
- Heteropoly acid
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沈阳化工大学材料科学与工程学院沈阳 110142

Coke-tolerant SiW20-Al/Zr10 catalyst for glycerol dehydration to acrolein

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通讯作者: 陈斌, bchen63@163.com

Coke-tolerant SiW₂₀-Al/Zr₁₀ catalyst for glycerol dehydration to acrolein