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The effect of the support on the surface composition of PtCu alloy nanocatalysts: In situ XPS and HS-LEIS studies

Chinese Journal of Catalysis 2017年第7期38卷 1229-1236页

作者：黄俊杰宋艳英马冬冬郑燕萍陈明树万惠霖厦门大学化学化工学院固体表面物理化学国家重点实验室醇醚酯化工清洁生产国家工程实验室福建厦门361005

Supported PtCu alloys have been broadly applied in heterogeneous catalysis and electrocatalysis owing to their excellent catalytic performance and high CO tolerance. It is important to analyze the outermost surface composition of the supported alloy nanoparticles to understand the nature of the catalytically active sites. In this paper, homogeneous face-centered cubic PtCu nanoparticles with a narrow particle size distribution were successfully fabricated and dispersed on a high-surface-area Ti〇2 powder support. The samples were oxidized and reduced in situ and then introduced into the ultrahigh vacuum chamber to measure the topmost surface composition by high-sensitivity low-energy ion scattering spectroscopy, and to determine the oxidation states of the elements by X-ray photoelectron spectroscopy. The surface composition and morphology, elemental distribu-tion, and oxidation states of the components were found to be significantly affected by the support and treatment conditions. The PtCu is de-alloyed upon oxidation with CuO wetting on the TiO2 sur-face and re-alloyed upon reduction. Phase diagrams of the surface composition and the bulk com-position were plotted and compared for the supported and unsupported materials.

关键词： PtCu alloy bimetal catalyst Surface composition Phase diagram In situ XPS-LEIS

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Plastic upgrading via catalytic pyrolysis with combined metal-modified gallium-based HZSM-5 and MCM-41

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Frontiers of Chemical Science and Engineering 2024年第11期18卷 179-191页

作者： Huaping Lin Likai Zhu Ye Liu Vasilevich Sergey Vladimirovich Bilainu Oboirien Yefeng Zhou National&Local United Engineering Research Centre for Chemical Process Simulation and Intensification College of Chemical EngineeringXiangtan UniversityXiangtan 411105China Institute of Power Engineering National Academy of Sciences of BelarusMinsk 220072Belarus Department of Chemical Engineering University of JohannesburgJohannesburg 17011South Africa

Currently,the conversion of waste plastics into high-value products via catalytic pyrolysis enables the advancement of plastics’open-loop ***,enhancing selectivity remains a critical *** study introduces a novel approach to catalytic pyrolysis,utilizing a combination of MCM-41 and modified gallium-based HZSM-5 catalysts,to achieve exceptional selectivity for aromatic liquid-phase products from linear low-density ***,to enhance the probability of dehydroaromatization optimization,the type and proportion of metal active sites within the HZSM-5 catalyst are fine-tuned,which would establish equilibrium with acid sites,resulting in a remarkable 15.72%increase in the selectivity of aromatic ***,to enhance the accessibility of volatiles to active sites,mesoporous MCM-41 with cracking capabilities is *** doping ratio of MCM-41 is meticulously controlled to facilitate the diffusion of cracked volatiles to the active centers of modified gallium-based HZSM-5,enabling efficient reforming *** findings demonstrate that MCM-41 significantly enhances the dehydroaromatization activity of the modified gallium-based HZSM-5 *** the influence of MCM-41:Zr_(2)Ga_(3)/HZSM-5=1:2 catalyst,the selectivity for aromatic hydrocarbons reaches an impressive 93.11%,with a notable 60.01%selectivity for benzene,toluene,ethylbenzene,and ***,this study proposes a plausible pathway for the generation of high-value aromatic hydrocarbons using the combined catalyst.

关键词： polyethylene pyrolysis aromatic hydrocarbons bimetal catalyst HZSM-5 MCM-41

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