Deactivation properties of a high-productive vanadia-titania catalyst for oxidation of o-xylene to phthalic anhydride
نویسندگان
چکیده
منابع مشابه
Novel Reaction Scheme for the Selective Oxidation of o- Xylene to Phthalic Anhydride
The oxidation of o-xylene to phthalic anhydride is one of the important industrial processes based on selective oxidation reactions. For the last 50 years vanadia titania catalysts have been used in this process. The reaction parameters like temperature range of operation, reactor inlet pressure, contact time, etc. slightly changed during this continuous process optimization. However, the funda...
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Abstract The aim of this case study is to develop a process model including both heat integration and separation processes by means of ASPEN PLUS simulation software. Previous studies have attempted to develop kinetic models or to retrieve optimal policies for operating the process multitubular catalytic fixed-bed reactor. This time a rigorous model is developed in ASPEN CUSTOM MODELER and expo...
متن کاملThe Interaction of V205 with Ti02(Anatase) II. Comparison of Fresh and Used Catalysts for o-Xylene Oxidation to Phthalic Anhydride Two types of vanadia are present in fresh V20JIi02(anatase) catalysts calcined at 450°C: surface vanadia coordinated to the TiOz
Two types of vanadia are present in fresh V20JIi02(anatase) catalysts calcined at 450°C: surface vanadia coordinated to the TiOz support and small crystallites of V205 (1, 2). The surface vanadia is the active site for the oxidation of o-xylene to phthalic anhydride (I, 3, 4). The surface vanadia is more active and selective than the VZOfi crystallites for the o-xylene oxidation reaction (I). T...
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The direct oxidative dehydrogenation of lactates with molecular oxygen is a "greener" alternative for producing pyruvates. Here we report a one-pot synthesis of mesoporous vanadia-titania (VTN), acting as highly efficient and recyclable catalysts for the conversion of ethyl lactate to ethyl pyruvate. These VTN materials feature high surface areas, large pore volumes, and high densities of isola...
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هدف اصلی این مطالعه تهیه یک سامانه نوین چسب عاجی دندانی بر پایه نانورس پیوند شده با پلی متاکریلیک اسید، نانورس پیوند شده با پلی اکریلیک اسید، مخلوط نانوسیلیکا و نانورس پیوند شده با پلی متاکریلیک اسید، مخلوط نانوسیلیکا و نانورس پیوند شده با پلی اکریلیک اسید و نانورس پیوند شده با کیتوسان اصلاح شده با گلایسیدیل متاکریلات است. پیوند پلی متاکریلیک اسید و پلی اکریلیک اسید بر ری سطح نانورس در حضور و ...
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ژورنال
عنوان ژورنال: Brazilian Journal of Chemical Engineering
سال: 2008
ISSN: 0104-6632
DOI: 10.1590/s0104-66322008000200013