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tert-Butylation of Toluene Catalyzed by Phosphotungstic Acid Supported on HBEA Zeolite

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Abstract

The performance of the catalysts prepared by impregnation of phosphotungstic acid (HPW) in HBEA zeolite with different HPW load (HPW(x)/HBEA) was evaluated in alkylation of toluene with tert-butanol with formation of 4-tert-butyltoluene (4-TBT). The obtained results showed that the HPW was highly dispersed on the HBEA support. The specific surface area of HPW(x)/HBEA zeolites decreased along with a decrease in pore volume. The Brønsted acidity of HPW(x)/HBEA showed a significant increase initially, reaching a maximum at x = 30% and then decreased with further increasing x. The Brønsted acidity of HPW(30%)/HBEA was 143.0 μmol/g, which is an increase of 69.8% when compared with that found for HBEA (84.2 μmol/g). The HPW(x)/HBEA zeolite with HPW loading of 30% exhibits the best catalytic activity at 180°C after 4 h. Toluene conversion over HPW(30%)/HBEA reached 73.1% with para-selectivity of 80.9%, which much higher than those found for HBEA (activity of 54.0% with para-selectivity of 69.5%). The improved toluene conversion over HPW(x)/HBEA can be attributed to their higher Brønsted acidity after loading HPW, while the improved selectivity can be attributed to the narrowed pores of HPW(x)/HBEA catalysts.

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Correspondence to Hua Song.

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Yuanyuan Wang, Han, Y., Sun, X. et al. tert-Butylation of Toluene Catalyzed by Phosphotungstic Acid Supported on HBEA Zeolite. Russ. J. Phys. Chem. 93, 250–254 (2019). https://doi.org/10.1134/S0036024419020341

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  • DOI: https://doi.org/10.1134/S0036024419020341

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