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首页> 外文期刊>RSC Advances >Enhanced performance of glycerol to aromatics over Sn-containing HZSM-5 zeolites
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Enhanced performance of glycerol to aromatics over Sn-containing HZSM-5 zeolites

机译：通过含Sn的HzSM-5沸石增强甘油对芳烃的性能增强

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The green production of aromatics from glycerol, a by-product of biodiesel manufacturing, is a potential alternative to the conventional production of aromatics through fossil fuel-based technology. In the present work the one-step catalytic conversion of glycerol to aromatics has been conducted over pure HZSM-5 and several metal species (Zn, Mo, Sn, Ni and Ag) modified HZSM-5 catalysts. Both the roles of metal species and HZSM-5 supports played during the GTA (glycerol to aromatics) procedure as well as the whole GTA catalytic process were investigated in this article. There are two main routes existing in zeolite upgrading of glycerol to aromatics, one by aldol condensation of glycerol dehydration products, in which oxygen in the glycerol is removed in the form of H _(2) O, whereas the other by oligomerization of olefins originated from the decarbonylation of glycerin dewatered products, in which oxygen in the feedstock is removed in the form of CO or CO _(2) . Among all the catalysts tested, 2.34 wt% Sn/HZSM-5, which exhibits 21.1 wt% in BTX aromatics yield and 10 h catalyst lifetime compared to the bare HZSM-5 (13.9 wt% of BTX aromatics and 5.5 h catalyst lifetime) and our previously reported optimum base-treated HZSM-5 catalyst (25.2 carbon yields%, i.e. 16.7 wt% of BTX aromatics), has demonstrated to be a potential candidate in the catalytic upgrading of glycerol. The incorporated Sn cations may preferentially accelerate the competitive decarbonylation steps ( i.e. , acetone → butene), and thus, facilitated the generation of xylene aromatics. Furthermore, the incorporated Sn cations could heal the framework defects in the HZSM-5 crystals and promote the transfer rate of coke precursors, greatly lessening the occurrence of the subsequent coking reactions during the whole GTA process.
机译：从甘油，生物柴油制造的副产品的绿色生产是通过化石燃料技术通过化石燃料技术常规生产芳烃的潜在替代品。在本工作中，甘油对芳烃的一步催化转化已经过纯HzSM-5和几种金属物种（Zn，Mo，Sn，Ni和Ag）改性HZSM-5催化剂。在本文中研究了在GTA（甘油至芳族化合物中）过程中使用的金属物种和HZSM-5支持的作用以及整个GTA催化过程。氨基钛矿升级甘油升级有两种主要途径，甘油脱水产物的氧化醇缩合，其中甘油中的氧气以H _（2）O的形式除去，而另一个通过烯烃的寡聚化源于烯烃从甘油脱水产物的脱羰基化，其中原料中的氧气以CO或CO_（2）的形式除去。在所有催化剂中测试，2.34wt％Sn / HzSM-5，其在BTX芳烃产率和10h催化剂寿命中表现出21.1wt％，与裸HZSM-5（13.9wt％的BTX芳烃和5.5h催化剂寿命）相比我们先前报道的最佳基础处理的HZSM-5催化剂（25.2个碳产率％，即16.7wt％的BTX芳族化合物），已经证明是催化升级甘油的潜在候选者。掺入的Sn阳离子可以优先加速竞争性脱羰基化步骤（即丙酮→丁烯），因此促进了二甲苯芳烃的产生。此外，已掺入的Sn阳离子可以治愈HzSM-5晶体中的骨架缺陷，促进焦炭前体的转移率，大大减少了整个GTA过程中随后的焦化反应的发生。

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