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首页> 美国卫生研究院文献>Nanomaterials >Conversion of Glycerol to Value Added Products in a Semi-Continuous Batch Reactor Using Noble Metals Supported on ZSM-11 Zeolite
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Conversion of Glycerol to Value Added Products in a Semi-Continuous Batch Reactor Using Noble Metals Supported on ZSM-11 Zeolite

机译：使用在ZSM-11沸石上支持的贵金属的半连续批量反应器中将甘油转化为增值产物

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摘要

Au, Pt, and Pd supported on ZSM-11 microporous zeolite were investigated as catalysts for glycerol (GLY) oxidation towards higher value added products. ZSM-11 was synthesized by hydrothermal treatment. Subsequently, ion exchange with NH4Cl was performed to recover acidic sites and then, Au, Pt, and Pd were incorporated onto this material by wet impregnation procedure. After thermal treatment of desorption and calcination, the corresponding Au, Pt, and Pd-ZSM-11 catalysts were obtained. These materials were characterized by different techniques, such as XRD, ICP, TEM- XEDS, and XPS, and were evaluated in the glycerol oxidation reaction by using alkaline medium and molecular oxygen as oxidizing agent. The higher conversion of GLY (66.5 mol.%) was reached for the Pt–ZSM-11 catalyst with moderate selectivity towards lactic acid (LA), while the bimetallic Au-Pt-ZSM-11 catalyst offered high selectivity to LA at moderate GLY conversion. Optimization of the main reaction parameters (i.e., temperature, reaction time and NaOH/GLY ratio) was carried out to maximize the selectivity towards the LA desired product. Thus, LA selectivity values close to 55% at GLY conversion >65% can be reached by using Pt-ZSM-11 as a catalyst under mild reaction conditions.
机译：在ZSM-11微孔沸石上支持的Au，Pt和Pd被研究为甘油（Gly）氧化促进更高附加产物的催化剂。通过水热处理合成ZSM-11。随后，进行与NH 4 Cl的离子交换以回收酸性位点，然后通过湿浸渍方法将Au，Pt和Pd掺入该材料上。解吸和煅烧热处理后，得到相应的Au，Pt和Pd-ZSM-11催化剂。这些材料的特征在于不同的技术，例如XRD，ICP，温度和XPS，并通过使用碱性介质和分子氧作为氧化剂在甘油氧化反应中进行评价。对于Pt-ZSM-11催化剂，达到PT-ZSM-11催化剂的较高转化（66.5摩尔％），对乳酸（LA）的中等选择性，而Bimetallic Au-Pt-ZSM-11催化剂在适度的含量下为La提供高选择性转换。进行主要反应参数（即，温度，反应时间和NaOH / Gly比率）的优化，以最大化对La所需产物的选择性。因此，通过在轻度反应条件下使用Pt-ZSM-11作为催化剂，可以达到接近55％的La选择性值> 65％。

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