تولید کاتالیست زئولیتی ZSM-5 و ارزیابی آن در واکنش ترانس آلکیل دارشدن تولوئن با آروماتیک C9
محورهای موضوعی : مهندسی شیمی
سید مصطفی طباطبایی قمشه
1
(استادیار گروه مهندسی شیمی، واحد ماهشهر، دانشگاه آزاد اسلامی، ماهشهر، ایران.)
کلید واژه: ترانس آلکیل دارشدن, زئولیت, آب گرمایی, واکنشگاه, کاتالیست.,
چکیده مقاله :
در این مطالعه کاتالیست زئولیتی ZSM-5 با روش آب گرمایی تهیه و ویژگی های آن با نمونه صنعتی مقایسه شد. نمونه تهیه شده گروه های ZSM-5 داشت و اندازه بلور ها درمقایسه با نمونه صنعتی کوچک تر بود. فعالیت کاتالیست تهیه شده در واکنش ترانس آلکیل دارشدن تولوئن با آروماتیک C9، بررسی شد. درصد تبدیل خوراک به بنزن و زایلن در حضور این کاتالیست با افزایش دما افزایش یافت، درحالی که گزینش پذیری دچار کاهش شد. افزایش WHSV موجب افزایش گزینش پذیری و کاهش درصد تبدیل شد. با توجه به نتیجه های به دست آمده از بررسی فعالیت کاتالیستی نمونه های صنعتی و تهیه شده با بهره گیری از طراحی آزمایش با روش سطح پاسخ (RSM)، برای کاتالیست صنعتی در دمای 437 درجه سلسیوس وWHSV برابر با 3/1، بیشترین درصد گزینش پذیری 65، درحالی که در همان دما و WHSV، برای کاتالیست تهیه شده، بیشترین درصد گزینش پذیری 77 به دست آمد. این نتیجه نشان داد که گزینش پذیری کاتالیست تهیه شده نسبت کاتالیست صنعتی، حدود 18 درصد بهبود یافته بود.
In this study, ZSM-5 zeolite catalyst was prepared by hydrothermal method and compared with commercial catalyst. The crystal size of the prepared catalyst was smaller than that of commercial sample. Catalytic behaviour of the prepared catalyst was investigated in transalkylation reaction of toluene with C9 aromatics. The percentage of conversion to benzene and xylene increased with increasing temperature, while the selectivity decreased. Increasing WHSV led to increasing the selectivity and decreasing the conversion. According to the results obtained from catalytic activity study of the catalysts using response surface methodology (RSM), the maximum selectivity of the commercial catalyst was 65 % at 437 °C and WHSV equal to 1.3 h-1, while the maximum selectivity of the prepared catalyst was 77 % at the same conditions. This result indicated that at the aforementioned conditions the selectivity of the prepared catalyst was around 18 % more than that of commercial catalyst.
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