A Monodispersed Spherical Zr‐Based Metal–Organic Framework Catalyst, Pt/Au@Pd@UIO‐66, Comprising an Au@Pd Core–Shell Encapsulated in a UIO‐66 Center and Its Highly Selective CO<sub>2</sub> Hydrogenation to Produce CO

Zheng, Zhizhong; Xu, Heng; Xu, Zheng; Ge, Jianping

doi:10.1002/smll.201702812

Cited by 77 publications

(46 citation statements)

References 73 publications

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“…linked by imidazole ligands, which have attracted extensive interest since the original report by Yaghi and co‐workers . High porosity originating from high crystallinity and regular topology structure makes ZIFs one of the best porous materials for the selective capture of CO 2 . The outstanding chemical and thermal stability of ZIFs are also favorable for its application under harsh conditions .…”

Section: Introductionmentioning

confidence: 99%

Space‐Confined Synthesis of ZIF‐67 Nanoparticles in Hollow Carbon Nanospheres for CO₂ Adsorption

Guo

Zhu

et al. 2019

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The synthesis of HCSs based core-shell structured nanocomposite can offer many benefits and potential applications. First, the remarkable durability stemming from the carbon framework would be highly beneficial for enduring harsh reaction conditions including acidic, alkaline, and organic regent. [4] Secondly, meso-/ micropores distributed on the surface of carbon shell can provide pathways for the diffusion of mass, which would reduce the diffusion resistance. [6] Last but not the least, the presence of huge inner space of HCSs with respect to the volume of carbon shell itself affords a huge reaction site. Therefore, it is important to experimentally and theoretically investigate the inner space of HCSs-based nanocomposites with controllable sizes for their optimum utilization.Zeolitic imidazole frameworks (ZIFs) with tetrahedral network topologies are a subclass of metal-organic frameworks (MOFs) composed of transition metals (Co, Cu, Zn, etc.) linked by imidazole ligands, which have attracted extensive interest since the original report by Yaghi and co-workers. [16,17] High porosity originating from high crystallinity and regular topology structure makes ZIFs one of the best porous materials for the selective capture of CO 2 . [18][19][20][21][22][23][24][25][26][27] The outstanding chemical and thermal stability of ZIFs are also favorable for its application under harsh conditions. [28][29][30][31][32][33][34][35] It is well established that the surface-to-volume ratio and total porosity of ZIFs are inversely related to its size, and have a significant influence on the adsorption capacity. [36,37] In this regard, reducing ZIFs to nanoscale size is favorable for increasing specific surface area and total porosity as well as enhancing uptake and selectivity.In this context, we report the synthesis of ZIF-67@HCSs material via a space-confined strategy, and its application for CO 2 capture. The as-synthesized ZIF-67@HCSs exhibited a unique core-shell structure composed of single microporous carbon shell and several nanoscale ZIF-67 cores. Due to the nanoconfined environment inside HCSs, these nanoreactors outperformed the conventional solution-based synthesis. [38] The results showed that:(1) the huge inner space of HCSs could be fully utilized without volume expansion, thus enhancing the tap density; (2) spaceconfined synthesis could control the size and morphology of ZIF-67 nanoparticles; (3) high chemical and thermal stability of ZIF-67 nanoparticles protected by hydrophobic carbon shell can avoid the moisture effects for real postcombustion gas separation, and therefore enhance the long-term stability. As expected, the ZIF-67@HCSs endowed with controlled morphology and high porosity exhibited outstanding adsorption capacity for CO 2 .Herein, the design and synthesis of ZIF-67 nanoparticles (NPs) with tunable size grown inside hollow carbon nanospheres (ZIF-67@HCSs) via a space-confined strategy is reported. HCSs are first prepared via pyrolysis of polystyrene@polypyrrole (PS@PPy) composite nanospheres. Furthe...

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Section: Introductionmentioning

confidence: 99%

Space‐Confined Synthesis of ZIF‐67 Nanoparticles in Hollow Carbon Nanospheres for CO₂ Adsorption

Guo

Zhu

et al. 2019

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“…Additionally, the microporous nature of the UIO-66 assists the adsorption of the Pt nanoparticles, which enhances the interaction between them, favoring the formation of isolated and well-dispersed Pt nanoparticle active sites. This advanced architecture results in excellent catalytic activity and CO selectivity for the RWGSR, and the concept of inserting nanoparticles into microporous MOFs will revolutionize future industrial applications (Zheng et al, 2018 ). DFT calculations indicate that the catalytic behavior of a Cu 12 TM (TM = Co, Rh, Ir, Ni, Pd, Ag, Au) bimetallic nanocluster in the RWGSR is dependent on the position of the d-band center.…”

Section: Catalytic Systemmentioning

confidence: 99%

“… Synthetic route for the production of Au@Pd NPs and other nanocomposites. Reprinted with permission from Zheng et al ( 2018 ). Copyright (2017) Wiley-VCH.…”

Section: Catalytic Systemmentioning

confidence: 99%

Recent Advances in Supported Metal Catalysts and Oxide Catalysts for the Reverse Water-Gas Shift Reaction

Chen

Song

et al. 2020

Front. Chem.

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The reverse water-gas shift reaction (RWGSR), a crucial stage in the conversion of abundant CO 2 into chemicals or hydrocarbon fuels, has attracted extensive attention as a renewable system to synthesize fuels by non-traditional routes. There have been persistent efforts to synthesize catalysts for industrial applications, with attention given to the catalytic activity, CO selectivity, and thermal stability. In this review, we describe the thermodynamics, kinetics, and atomic-level mechanisms of the RWGSR in relation to efficient RWGSR catalysts consisting of supported catalysts and oxide catalysts. In addition, we rationally classify, summarize, and analyze the effects of physicochemical properties, such as the morphologies, compositions, promoting abilities, and presence of strong metal-support interactions (SMSI), on the catalytic performance and CO selectivity in the RWGSR over supported catalysts. Regarding oxide catalysts (i.e., pure oxides, spinel, solid solution, and perovskite-type oxides), we emphasize the relationships among their surface structure, oxygen storage capacity (OSC), and catalytic performance in the RWGSR. Furthermore, the abilities of perovskite-type oxides to enhance the RWGSR with chemical looping cycles (RWGSR-CL) are systematically illustrated. These systematic introductions shed light on development of catalysts with high performance in RWGSR.

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“…The CuZn alloy provides active sites in RWGS, meanwhile, pyridinic N strongly accelerates CO 2 adsorption and activation. Some other related studies about the core-shell structures in RWGS include noble metal@MOF-74 (Au@Pd@MOF-74), [135] Pt/Au@Pd@UiO-66, [136] Co@CoO. [137]…”

Section: Representative Progress Of Core-shell Structures In Thermal mentioning

confidence: 99%

Engineering Heterostructured Nanocatalysts for CO₂ Transformation Reactions: Advances and Perspectives

2020

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After postdoctoral research at the University of Tokyo and the University of California at Berkeley, at the end of 2003, he joined the faculty of Peking University. His research focuses on fundamental studies of catalyst structures and reaction mechanisms, towards the design of heterogeneous catalysts and control of reaction pathways for selective conversion of biomass and its derivatives into chemicals, as well as other reactions important in renewable energy conversion and utilization.

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A Monodispersed Spherical Zr‐Based Metal–Organic Framework Catalyst, Pt/Au@Pd@UIO‐66, Comprising an Au@Pd Core–Shell Encapsulated in a UIO‐66 Center and Its Highly Selective CO₂ Hydrogenation to Produce CO

Cited by 77 publications

References 73 publications

Space‐Confined Synthesis of ZIF‐67 Nanoparticles in Hollow Carbon Nanospheres for CO₂ Adsorption

Space‐Confined Synthesis of ZIF‐67 Nanoparticles in Hollow Carbon Nanospheres for CO₂ Adsorption

Recent Advances in Supported Metal Catalysts and Oxide Catalysts for the Reverse Water-Gas Shift Reaction

Engineering Heterostructured Nanocatalysts for CO₂ Transformation Reactions: Advances and Perspectives

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A Monodispersed Spherical Zr‐Based Metal–Organic Framework Catalyst, Pt/Au@Pd@UIO‐66, Comprising an Au@Pd Core–Shell Encapsulated in a UIO‐66 Center and Its Highly Selective CO2 Hydrogenation to Produce CO

Cited by 77 publications

References 73 publications

Space‐Confined Synthesis of ZIF‐67 Nanoparticles in Hollow Carbon Nanospheres for CO2 Adsorption

Space‐Confined Synthesis of ZIF‐67 Nanoparticles in Hollow Carbon Nanospheres for CO2 Adsorption

Recent Advances in Supported Metal Catalysts and Oxide Catalysts for the Reverse Water-Gas Shift Reaction

Engineering Heterostructured Nanocatalysts for CO2 Transformation Reactions: Advances and Perspectives

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A Monodispersed Spherical Zr‐Based Metal–Organic Framework Catalyst, Pt/Au@Pd@UIO‐66, Comprising an Au@Pd Core–Shell Encapsulated in a UIO‐66 Center and Its Highly Selective CO₂ Hydrogenation to Produce CO

Space‐Confined Synthesis of ZIF‐67 Nanoparticles in Hollow Carbon Nanospheres for CO₂ Adsorption

Space‐Confined Synthesis of ZIF‐67 Nanoparticles in Hollow Carbon Nanospheres for CO₂ Adsorption

Engineering Heterostructured Nanocatalysts for CO₂ Transformation Reactions: Advances and Perspectives