Environmental Catalysis by Nanostructured Chromium Oxides: Methanol Conversion to Dimethyl Ether as a Clean Fuel Alternative

الموضوعات

علوم بيئية

الملخص

Heterogeneous catalysts which are mainly based on metal particles and metal oxides have shown promising activity and selectivity in several environmental and industrial important reactions. Catalysis plays a key role in chemical and material manufacturing, fuel cells as well as other energy conversion and pollution control systems. Petroleum and fuel industry, in particular, rely largely on heterogeneous catalysis. Since catalysts play such a critical role in essential processes, the search for more effective and selective catalysts continues to be of great importance for both environmental and commercial considerations. The current study focuses on the catalytic conversion of methanol to other fuel alternatives and valuable chemicals, especially dimethyl ether (DME) which has attracted the attention of several companies and researchers due to its potential use as an environmentally clean fuel. Several metal oxide catalysts were investigated in this study including chromium(III) oxide, iron (III)oxide, titanium oxide, aluminum oxide, and several composites based on these oxides. The selection of these systems was based on their known activity in acid-base as well as oxidation-reduction surface reactions. The first part of this work involves various studies aimed at developing cost-effective methods to prepare nano-structured chromium(III) oxide-based catalysts. Pure chromium oxide and chromium oxide-containing catalysts have been prepared by sol gel and forced precipitation methods. These are appropriate preparative methods for the synthesis of ultra-fine oxide materials at relatively low temperatures and reasonable cost. The effect of chromium on the composition and textural properties was characterized by powder X-ray diffraction (XRD), transmission electron microscopy (TEM), FTIR spectroscopy, and N 2 adsorption. In the second part of this work, the activity and selectivity of these catalysts in methanol conversion to dimethyl ether (DME) and other valuable chemicals was investigated. This study involved all chromium mixed oxides as well as prepared and commercial corresponding pure oxides. Comparison between the catalysts and correlation between the catalysts' activity and the composition as well as textural characteristics were established.

روابط وملفات

التعريف والنوع

رقم الوثيقة

05744777-3e6a-4bfe-b51e-e97dd2c7f5f9

رقم العقد

0

نوع الوسائط

Crawler

نوع المحتوى

الرسائل العلمية

صيغة المصدر

رسائل ماجيستير

نوع الملف

pdf text

أسماء الملفات

8585_1.pdf

بيانات النشر

ترجمة العنوان

أكاسيد الكروم كعوامل حفازة في تطبيقات بيئية: تحويل الميثانول الى ثنائي ميثيل الايثر كوقود نظيف وملائم بيئيا

ألقاب المؤلفين

[{"name_ar":" Abbas Khalecl","title_ar":"اشراف","title_en":"Supervision"},{"name_ar":"مريم حميد سالم الشامسي ","title_ar":"اعداد","title_en":"Preparation"}]

اللغة

English

المصدر والدورية

اسم المصدر

Environmental Catalysis by Nanostructured Chromium Oxides: Methanol Conversion to Dimethyl Ether as a Clean Fuel Alternative

المحتوى والصفحات

عدد الصفحات

0

إشراف وإعداد

الإشراف

Abbas Khalecl

الإعداد

مريم حميد سالم الشامسي

الاقتباسات الببليوغرافية