کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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41759 | 45899 | 2011 | 9 صفحه PDF | دانلود رایگان |
The catalytic liquid phase benzylation of benzene to diphenylmethane (DPM) with benzyl alcohol (BnOH) was investigated over various zeolite catalysts (HSZ 600 mordenite, CBV 20A mordenite, H-beta zeolites with Si/Al of 10.8 and 35.8, respectively) at 353–423 K and under atmospheric pressure, using three reaction methodologies: (A) by adding all benzyl alcohol at the beginning of the reaction, (B) by dropwise addition of benzyl alcohol (1–2 drops/min for 4 h) and (C) under continuous flow conditions. Nafion-embedded silica and AlCl3/MCM-41 were also tested for comparison. The conversion and product distribution largely depended on the experimental conditions and the zeolite nature. Under optimal conditions using the Beta zeolite (Si/Al molar ratio of 10.8) and the (C) methodology, selectivity to DPM of 88.9% for a conversion of BnOH of 99.2% were achieved. Recycling tests showed that the catalyst preserved its activity and selectivity to DPM after several cycles.
Figure optionsDownload high-quality image (96 K)Download as PowerPoint slideResearch highlights▶ Diphenylmethane (DPM) is mostly used in the fragrance industry and agrochemicals. ▶ Benzylation is carried out in “green” advantageous conditions with SDPM of 88.9%. ▶ Used catalysts are cheap and the experimental set-up is simple and practical. ▶ The purification of the final product is easily done.
Journal: Applied Catalysis A: General - Volume 393, Issues 1–2, 15 February 2011, Pages 206–214