Conversion of dimethyl ether to hydrocarbons catalyzed by Pd-loaded *MRE zeolites

IF 5.3 2区化学 Q1 CHEMISTRY, APPLIED Catalysis Today Pub Date : 2025-03-01 DOI:10.1016/j.cattod.2025.115258

Benjamin Niethammer , Foteini Zormpa , Gia Trung Hoang , Nikolaj Aljoscha Slaby , Thomas Anthony Zevaco , Stamatia Karakoulia , Ulrich Arnold , Jörg Sauer

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Abstract

The influence of Pd loading on the conversion of dimethyl ether (DME) to hydrocarbons (DTH) was investigated for *MRE-type zeolite catalysts. Catalysts with different Pd loadings were prepared by incipient wetness impregnation and characterized in terms of morphology, composition and acidity. Co-feeding of H₂ during DME conversion increased the resistance of the Pd/*MRE catalysts to deactivation, which significantly increased their lifetimes and thus conversion capacities. The product spectra show high olefin contents, comprising light olefins and higher olefins in the C₅–C₁₁ range, while contents of aromatics are low. H₂ co-feeding reduces the formation of cyclic hydrocarbons and increases the formation of n- and iso-alkanes as well as olefins. Higher Pd loadings slightly decrease olefin production but increase paraffin formation, indicating direct hydrogenation of olefins on Pd nanoparticles. The olefin-rich products offer several possibilities for further processing to fuels and chemicals.

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负载pd的*MRE沸石催化二甲醚转化为碳氢化合物

以* mre型沸石为催化剂，研究了Pd负载对二甲醚（DME）转化为碳氢化合物（DTH）的影响。采用初湿浸渍法制备了不同Pd负载的催化剂，并对其形貌、组成和酸度进行了表征。在二甲醚转化过程中，共进料H2增加了Pd/*MRE催化剂的抗失活能力，从而显著提高了它们的寿命和转化能力。产物光谱显示烯烃含量高，包括c5 ~ c11范围内的轻烯烃和高烯烃，芳烃含量低。H2共加注减少了环烃的生成，增加了正烷烃和异烷烃以及烯烃的生成。较高的Pd负载略微降低了烯烃产量，但增加了石蜡形成，表明Pd纳米颗粒上的烯烃直接加氢。富含烯烃的产品为进一步加工成燃料和化学品提供了几种可能性。

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来源期刊

Catalysis Today 化学-工程：化工

CiteScore

11.50

自引率

3.80%

发文量

573

审稿时长

2.9 months

期刊介绍： Catalysis Today focuses on the rapid publication of original invited papers devoted to currently important topics in catalysis and related subjects. The journal only publishes special issues (Proposing a Catalysis Today Special Issue), each of which is supervised by Guest Editors who recruit individual papers and oversee the peer review process. Catalysis Today offers researchers in the field of catalysis in-depth overviews of topical issues. Both fundamental and applied aspects of catalysis are covered. Subjects such as catalysis of immobilized organometallic and biocatalytic systems are welcome. Subjects related to catalysis such as experimental techniques, adsorption, process technology, synthesis, in situ characterization, computational, theoretical modeling, imaging and others are included if there is a clear relationship to catalysis.