首页|Enhanced photothermal dehydration of methanol over W18O49/Au/SAPO-34 catalysts with broadened light absorption

Enhanced photothermal dehydration of methanol over W18O49/Au/SAPO-34 catalysts with broadened light absorption

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Methanol-to-olefins(MTO)process is one of the most critical pathways to produce low carbon olefins.Typically,the reaction is driven by thermal catalysis,which inevitably needs to consume large amounts of fossil fuel.Developing a new technique to substitute for the fuel burning is urgent for MTO process to improve the industry prospects and sustainability.Herein,we report a novel W18O49/Au/SAPO-34(W/Au/S),a multifunctional pho-tothermal catalyst for the MTO reaction.A high methanol conversion was achieved under xenonum(Xe)lamp irra-diation,yielding methyl ether(ME)and ethylene as the main products.The optimized W/Au/S catalysts showed ethylene yield as high as 250 μmol in 60 min,which was 2.5 times higher than that of Au/SAPO-34.The physio-chemical characterization revealed that the SAPO-34 molecular sieves were surrounded by Au and W18O49 nanoparticles,which exhibited a strong localized surface plasmon resonance excitation around 540 nm and light absorption beyond 500 nm.The multifunctional catalysts showed a strong photothermal effect,arising from the broadened light absorption of Au and W18O49 nanoparticles,leading to a temperature as high as 250 ℃ on the surface of the catalysts.Mechanism study showed that the superior ethylene selectivity of W/Au/S catalysts was attributed to the moderating acidic sites of W18O49 for methanol dehydration to ethylene.This research may pro-vide new insight for designing heterostructures to improve photo-to-chemical conversion performance and is expected to accelerate progress toward the excellent multifunctional photothermal catalysts with broad light absorption for methanol activation and C-C bond formation.

Methanol conversionEthylenePhotothermal catalysisW18O49Brønsted-acid

Ya-Qin Tang、Meng-Xia Yan、Chang-Qian Lu、Shao-Yuan Li、Kui-Xian Wei、Tao Qu、Wen-Hui Ma、Yong-Nian Dai、Kong-Zhai Li、Da-Jun Luo、Xue-Liang Zhang、Yi-Ke Liu

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Faculty of Metallurgical and Energy Engineering,Kunming University of Science and Technology,Kunming 650093,China

School of Materials and Energy Engineering,Guizhou Institute of Technology,Guiyang 550003,China

Highlevel Innovative Talent Cultivation Project of Guizhou ProvinceNatural Science Research Project of Guizhou Provincial Department of EducationAcademic New Seedling Cultivation and Innovation Exploration Project of Guizhou Institute of Technology

GZSQCC2019003QJHKY Zi[2021]257GZLGXM-08

2024

10.1007/s12598-023-02511-w

稀有金属(英文版)
中国有色金属学会

稀有金属(英文版)

CSTPCDEI
影响因子：0.801
ISSN：1001-0521
年,卷(期)：2024.43(3)
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