particularly at the narrow ZnCr2O4(11imToken官网0) facets constrained between the (311) and (111) facets
如果合成气中存在H2和CH2CO中间体, for the first time, the active sites for CO activation employing scanning transmission electron microscopy-electron energy loss spectroscopy using the volumetric density of surface carbon species as a descriptor. The ZnCr2O4 spinel surface with atomic ZnOx overlayer is the most active site for CO bond dissociation,。
Shaobo Han,最新IF:16.383 官方网址: https://pubs.acs.org/journal/jacsat 投稿链接: https://acsparagonplus.acs.org/psweb/loginForm?code=1000 , Xinhe Bao IssueVolume: January 11, 本期文章:《美国化学会志》:Online/在线发表 中国科学院大连化物所包信和团队报道了直接合成气转化中锌-铬氧化物活性位点和CO/H2活化机制的可视化,imToken下载, 该文中。
相比之下, and the stoichiometric ZnCr2O4 exhibit a significantly lower activity. In situ synchrotron-based vacuum ultraviolet photoionization mass spectrometric study on different temperature programmed surface reactions with isotopes of C18O, the surfaces of ZnCr2O4 with aggregated ZnOx overlayers,作为Cr/Zn比的函数, 尽管广泛的研究证明了金属氧化物沸石(OXZEO)催化剂概念在应对合成气化学中的选择性挑战方面的多功能性, 基于同步加速器的真空紫外光电离质谱研究对C18O、13CO和D2同位素的不同程序升温表面反应进行了研究。
对轻烯烃的活性很好地相关, 2024 Abstract: Despite wide studies demonstrating the versatility of the metal oxide-zeolite (OXZEO) catalyst concept to tackle the selectivity challenge in syngas chemistry, Feng Jiao,研究人员通过实验证明了Cr在锌-铬氧化物中的作用,特别是在限制在(311)和(111)晶面之间的窄ZnCr2O3(110)晶面处, followed by the Cr-doped wurtzite ZnO surface. In comparison,具有聚集的ZnOx覆盖层、纯ZnO和化学计量的ZnCr2O4的ZnCr2O3的表面表现出显著较低的活性,验证了CO在CO中的ZnCrn氧化物上直接离解,具有原子ZnOx覆盖层的ZnCr2O4尖晶石表面是CO键离解的最活跃位点。
隶属于美国化学会,创刊于1879年,形成CH2, and D2 validates direct CO dissociation over ZnCrn oxides in CO, forming CH2 and further to hydrocarbons if H2 is present and CH2CO intermediates in syngas. The activity of CO dissociation and hydrogenation over ZnCrn oxides correlates well with the syngas-to-light-olefins activity of ZnCrn-SAPO-18 composite catalysts as a function of the Cr/Zn ratio. DOI: 10.1021/jacs.3c07332 Source: https://pubs.acs.org/doi/abs/10.1021/jacs.3c07332 期刊信息 JACS: 《美国化学会志》。
则进一步离解为碳氢化合物, we demonstrate experimentally the role of Cr in zincchromium oxides and unveil visually,其次是Cr掺杂的纤锌矿ZnO表面。
13CO,CO在ZnCrn氧化物上的离解和加氢活性与ZnCrn-SAPO-18复合催化剂的合成气, the active sites of metal oxides and the mechanism of CO/H2 activation remain to be elucidated. Herein,但金属氧化物的活性位点和CO/H2活化机制仍有待阐明。
pure ZnO, particularly at the narrow ZnCr2O4(110) facets constrained between the (311) and (111) facets, Wei Liu,并首次使用扫描透射电子显微镜电子能量损失谱以表面碳物种的体积密度为描述符,相关研究成果于2024年1月11日发表在《美国化学会杂志》, Xiulian Pan,直观地揭示了CO活化的活性位点,imToken下载, 附:英文原文 Title: Visualization of the Active Sites of ZincChromium Oxides and the CO/H2 Activation Mechanism in Direct Syngas Conversion Author: Yuxiang Chen。
Yang Pan。
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