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首页> 外文期刊>Separation and Purification Technology >Development of a H_2-selective SiO_2-membrane for the catalytic dehydrogenation of propane
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Development of a H_2-selective SiO_2-membrane for the catalytic dehydrogenation of propane

机译：丙烷催化脱氢用H_2选择性SiO_2膜的研制

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Commercial alumina ceramic tubes of asymmetric cross section were used as supports for the deposition of SiO_2 layers by the sol-gel technique. The SiO_2 gel layer has been built up on the #gamma#-alumina ultrafiltratioin (UF)-layer of the support by dip-coating with a Sio_2-polymer sol. The sol was prepared by a two-step acidic-base hydrolysis of tetraethylorthosilicate (TEOS) in alcoholic solution with a relative low content of water 9H_2O:TEOS=4.3:1). The following step of hydrolysis and condensation was varied by different amounts of NH_4OH. These sols of lowly branched SiO_2 polymers with60-70% _3 units were used for dip-coating. After drying (2 h at ambient temperature) the membranes have been calcined at 600deg C. The ressulting membranes show hydrogen fluxes >=20 m~3(STP)/m~2 h bar and perselectivities hydrogen:propane betwen 30 and 75 in a temperature region of 450-550deg C. the membranes were tested in membrane supported propane dehydrogenation. the propene yield in the membrane reactor can be higher than in a conventional fixed-bed reactor if the hydrogen is removed by a h_2-selective membrane. After several regeneration cycles, stable and acceptable membrane properties are found.
机译：使用不对称横截面的商业氧化铝陶瓷管作为载体，通过溶胶-凝胶技术沉积SiO_2层。通过用Sio_2-聚合物溶胶浸涂，在载体的＃γ＃-氧化铝超滤（UF）层上建立了SiO_2凝胶层。溶胶是通过在酒精溶液中相对较低的水含量9H_2O：TEOS = 4.3：1）对原硅酸四乙酯（TEOS）进行两步酸碱水解而制得的。水解和缩合的后续步骤因使用不同量的NH_4OH而不同。这些具有60-70％_3单元的低支化SiO_2聚合物溶胶用于浸涂。干燥（在环境温度下2小时）后，将膜在600摄氏度下煅烧。过滤后的膜显示氢通量> = 20 m〜3（STP）/ m〜2 h bar，氢：丙烷在30和75之间的选择性在450-550℃的温度范围内，在膜支持的丙烷脱氢中测试膜。如果通过h_2选择性膜除去氢，则膜反应器中的丙烯收率可以高于常规固定床反应器中的丙烯收率。经过数次再生循环后，发现稳定且可接受的膜性能。

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