Yttria stabilized zirconia derived from metal–organic frameworks

Yue, Zifeng; Liu, Shucheng; Liang, Yi

doi:10.1039/c4ra14728f

Cited by 8 publications

(7 citation statements)

References 21 publications

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“…Thus it is desirable to obtain materials that maintain rich acid sites for porous solid acids similar to MOF materials and meanwhile possess high stability. In a previous literature, direct calcination of yttrium‐doped UiO‐66 was conducted to produce YSZ with maximum BET surface of 34.6 m 2 g −1 . However, this almost nonporous structure could make it difficult to be used as support for catalysts.…”

Section: Introductionmentioning

confidence: 99%

Confined Transformation of UiO‐66 Nanocrystals to Yttria‐Stabilized Zirconia with Hierarchical Pore Structures for Catalytic Applications

Qin

Zeng

2019

Adv Funct Materials

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Solid acids as a substitution for hazardous liquid acids (e.g., HF and H 2 SO 4 ) can promote many important reactions in the industry, such as carbon cracking, to proceed in a more sustainable way. Starting from a zirconium-based metal-organic framework (UiO-66 nanocrystals), herein a transformative method is reported to prepare micro/mesoporous yttria-stabilized zirconia (YSZ) encapsulated inside a mesoporous silica shell. It is then further demonstrated that the resultant reactor-like catalysts can be used for a wide range of catalytic reactions. The acidity of the YSZ phase is found with rich accessible Lewis acid and Brønsted acid sites and they display superior performances for esterification (acetic acid and ethanol) and Friedel-Crafts alkylation (benzylation of toluene). After being loaded with different noble metals, furthermore, hydrogenation of CO 2 and a one-pot cascade reaction (nitrobenzene and benzaldehyde to N-benzylaniline) are used as model reactions to prove the versatility and stability of catalysts. Based on the findings of this work, it is believed that this class of reactor-like catalysts can meet future challenges in the development of new catalyst technology for greener heterogeneous catalysis. and thus their catalytic performances are determined to a great extent by their workable surface areas. Porous solid acids with high specific surface area can provide more accessible acid sites, which will significantly enhance catalyst efficiency. [2] Furthermore, compared with simply single pore size featured (e.g., micropore or mesopore) porous materials, hierarchical pore structures could endow them with better mass diffusion properties. [3] Meanwhile, functionalization of solid acids with active metal components has also been found to play a crucial role in many common reactions, such as the conversion of organic intermediates to synthetic drugs; [4] in those cases, engineering porosity for solid acid materials is also of vital importance because it endows them with a high loading capacity and uniform distribution of added components. Furthermore, topology of such supporting materials has been employed recently to resist sintering through size confinement, [5] which is one of the commonest impediments to nanoparticle catalysis. In this regard, ordered porous solid-acid catalysts could also play such a role to combat the sintering of their loaded metals. However, attention being devoted to this class of composite materials is found relatively lacking.On the other hand, in searching newer acid materials, it is recognized that metal-organic frameworks (MOFs) have drawn enormous attention in the last 20 years. Because of their high specific surface area, tunable porosity, and other functionalizable physicochemical properties, MOFs have been widely used in a variety of applications including molecular adsorptiondesorption, membrane separation, gas sensing, heterogeneous catalysis, encapsulation and controlled releases. [6] In particular, with coordinative unsaturation or open active metal sites on ...

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Section: Introductionmentioning

confidence: 99%

Confined Transformation of UiO‐66 Nanocrystals to Yttria‐Stabilized Zirconia with Hierarchical Pore Structures for Catalytic Applications

Qin

Zeng

2019

Adv Funct Materials

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“…13,14 More recently, yttria-stabilized zirconia (YSZ) has been obtained from Y-doped MOFs by a two-step thermal treatment in an inert atmosphere and then in oxygen. 15 The derived YSZ had a large surface area, a crystalline framework, and a high oxygen ion conductivity. In addition, a new scalable synthesis strategy for the preparation of octahedral Cr 2 O 3 with a large surface area and porosity was reported by combustion synthesis using MIL-101ĲCr) as a sacrificial template.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of mesoporous and tetragonal zirconia with inherited morphology from metal–organic frameworks

Yan

Fan

et al. 2015

CrystEngComm

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Controlled synthesis of porous metal oxides with desired morphology has been motivating scientists to explore and develop new preparation methodologies. Among them, thermal decomposition of metal-organic frameworks (MOFs) has been employed for the fabrication of several metal oxides. In this work, this strategy is employed to prepare mesoporous and tetragonal zirconia (t-ZrO2) from metal-organic framework (UiO-66), acting as both morphological template and zirconium source. This process avoids the use and removal of extra template as well as the addition of stabilizers for t-ZrO2. After thermal decomposition at 500 °C, t-ZrO2 inherited octahedral morphology from the pristine precursor, and possessed small nanoparticles with an average size of 3.1 nm. The derived t-ZrO2 had a large surface area of 174 m 2 /g and the pore diameter of 5-8 nm. The formation mechanism of t-ZrO2 was also discussed. This simple and potentially universal strategy can be used to fabricate porous metal oxides with desired shape for many applications.

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“…Importantly, the carbon template formed in situ can be removed under moderate heating in air. Similar carbon templating approaches have been reported recently; however, in those studies the hybrid materials were never heated above 600°C . In this work, the PO gels were sintered between 1150°C and 1350°C, realistic temperatures for SOFC electrode fabrication.…”

Section: Introductionmentioning

confidence: 74%

“…Similar carbon templating approaches have been reported recently; however, in those studies the hybrid materials were never heated above 600°C. 27,28 In this work, the PO gels were sintered between 1150°C and 1350°C, realistic temperatures for SOFC electrode fabrication. The practical utility of this approach for low-temperature SOFC electrodes is discussed.…”

Section: Introductionmentioning

confidence: 99%

Preserving Nanomorphology in YSZ Scaffolds at High Temperatures via In Situ Carbon Templating of Hybrid Materials

2016

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Yttria‐stabilized zirconia (YSZ, 8 mol% Y2O3) scaffolds, with surface areas up to 68 m2/g, were prepared by sintering hybrid inorganic‐organic propylene oxide (PO) gels in an argon atmosphere between 1050°C and 1350°C. During sintering, a hard carbon template forms in situ that preserves the scaffold nanomorphology. The carbon template is completely removed postsinter by heating in air to 700°C. Surface areas of 24, 14, 3.2, and 2.4 m2/g were achieved for argon sintering temperatures of 1050°C, 1150°C, 1250°C, and 1350°C, respectively. By adding glucose to the gel formulation, the amount of carbon template increases from 4 to 59 wt% and the surface area increases from 14 to 68 m2/g. Remarkably, the surface area only decreases to 59 m2/g upon heating to 900°C in air. This in situ carbon templating approach offers a flexible platform to create and preserve highly desirable surface areas and nanomorphologies while sintering at high temperatures. The utility of this approach to improve low‐temperature solid oxide fuel cell electrode performance is discussed.

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Yttria stabilized zirconia derived from metal–organic frameworks

Abstract: Mesoporous yttria stabilized zirconia (YSZ) with single cubic structures is obtained via a two-step thermal treatment based on a Y-doped UiO-66 template.

Cited by 8 publications

References 21 publications

Confined Transformation of UiO‐66 Nanocrystals to Yttria‐Stabilized Zirconia with Hierarchical Pore Structures for Catalytic Applications

Confined Transformation of UiO‐66 Nanocrystals to Yttria‐Stabilized Zirconia with Hierarchical Pore Structures for Catalytic Applications

Synthesis of mesoporous and tetragonal zirconia with inherited morphology from metal–organic frameworks

Preserving Nanomorphology in YSZ Scaffolds at High Temperatures via In Situ Carbon Templating of Hybrid Materials

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