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پریسا مقیم پور بیژنی

Dimethyl ether (DME) is a versatile multi-source multi-purpose chemical being projected to become one of the main chemical feedstocks in the 21st century. It is a non-toxic, eco-friendly and easily condensable gas that can be used both as a fuel or as a chemical feedstock [1]. DME can be produced by methanol dehydration. In this study, three γ-Al2O3 catalysts for methanol dehydration to DME were synthesized by the precipitation method using different aluminum sources (Table 1). The activity of the catalysts was compared with a commercially available γ-alumina catalyst. The result showed that the Al precursor strongly affected the structural properties and catalytic performance with the catalyst produced from aluminum nitrate had the highest catalytic performance under the same reaction conditions, being comparable with the commercial γ-Al2O3. As a general trend, catalytic performance improved significantly with increasing specific surface area and pore volume of the catalysts, which are in turn a function of the textural properties and crystallinity of the sample. These caharactristics favor the availability and accessibility of acidic active sites to methanol reactant. In contrasrt, samples with low porosity and/or smaller crystallite size are less active, most probably due to their predominant amorphous nature [2]. Table 1. Textural properties and activity of catalyst samples. Sample name Aluminum source BET surface area (m2/g) Pore volume (cm3/g) Pore diameter (nm) Methanol conversion (%) a T=260 ˚C, WHSV=3h-1 T=300 ˚C, WHSV=20 h-1 S1 Sodium aluminate 357 0.88 49.6 79 80 S2 Aluminum nitrate 353 0.80 45.5 79 82 S3 Aluminum foil 204 0.30 29.4 14 17 Commercial - 246 0.74 62.0 80 81 a The catalyst activity measurements were carried out in an isothermal fixed-bed stainless steel reactor (i.d. 10 mm) at temperatures of 260 and 300 ◦C under atmospheric pressure. Feed: pure methanol, WHSV= Weight Hourly Space Velocity.

γ-Al2O3 synthesis, Methanol dehydration, Dimethyl ether, Catalyic performance

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مقیم پور بیژنی، پریسا، 1402، γ-Al2O3 catalysts synthesis with different aluminum sources for methanol dehydration to dimethylether، بیست و دومین کنفرانس شیمی معدنی ایران، https://conference.uok.ac.ir/fa/archive_index.php?c=HN-iicc22&aid=1517590