Abstract
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.
基金项目
Highlevel Innovative Talent Cultivation Project of Guizhou Province(GZSQCC2019003)
Natural Science Research Project of Guizhou Provincial Department of Education(QJHKY Zi[2021]257)
Academic New Seedling Cultivation and Innovation Exploration Project of Guizhou Institute of Technology(GZLGXM-08)
NETL
NSTL
万方数据