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دانلود مقاله Influence of zeolite content and temperature on the catalytic properties of novel biporous catalysts فایل ورد (word) دارای 2 صفحه می باشد و دارای تنظیمات در microsoft word می باشد و آماده پرینت یا چاپ است

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توجه : در صورت  مشاهده  بهم ریختگی احتمالی در متون زیر ،دلیل ان کپی کردن این مطالب از داخل فایل ورد می باشد و در فایل اصلی دانلود مقاله Influence of zeolite content and temperature on the catalytic properties of novel biporous catalysts فایل ورد (word) ،به هیچ وجه بهم ریختگی وجود ندارد

بخشی از متن دانلود مقاله Influence of zeolite content and temperature on the catalytic properties of novel biporous catalysts فایل ورد (word) :

سال انتشار: 1394
محل انتشار: دومین کنفرانس ملی زئولیت ایران
تعداد صفحات: 2
نویسنده(ها):
N Parsafard – Departmentof chemistry, Shahid Beheshti University, Tehran, 1983963113, Iran
M.H Peyrovi – Departmentof chemistry, Shahid Beheshti University, Tehran, 1983963113, Iran

چکیده:

Pt loaded on a series of ZSM-5/HMS composites with different H-zeolite amounts has been prepared and used as a solid acid catalyst for n-heptane isomerization that compared as a function of H-zeolite content. The structure characterization, acid distribution and morphology of the Pt catalysts supported on these composite materials were characterized by XRD, NH3–TPD, SEM, FTIR, nitrogen sorption and TGA techniques. Compared with HMS and HZSM-5, these new composite materials have higher ability for n-heptane isomerization reaction. The results show that these micro/mesoporous catalysts exhibit both properties of mesoporous HMS and microporous HZSM-5. TPD measurements showed that the acidity of HZSM-5/HMS materials enhanced with the increasing zeolite content. Results showed that the ratio of Brnsted/Lewis acidic sites increased with the increasing zeolite content. The catalytic evaluation revealed that Pt/ZSM5-HMS catalysts had a high activity for conversion of n-heptane. The distribution of products was described based on the nature of the acidic sites. These new composite catalysts prove a higher thermal stability, which result in their thicker pore-wall, and appropriate acidity.

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