Tailoring the local environment of silver in SSZ-13 zeolites for low-temperature catalytic oxidation of ammonia

Qiu, Ziyi; Yang, Guoju; Li, Li; Peng, Sainan; Nan, Maiyan; Zhang, Jing; Li, Lin; Hou, Ying; Chen, Xiaoxin

doi:10.1016/j.apsusc.2022.153856

Cited by 6 publications

(4 citation statements)

References 55 publications

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“…In diesel vehicle exhaust systems, ammonia oxidation catalysts are positioned downstream of the NH 3 -SCR catalyst to avoid ammonia slip from NH 3 -SCR system. [41,42] However, over the traditional platinumbased oxidation catalysts, ammonia oxidation shows relatively low selectivity for nitrogen and the side reactions cause the generation of N 2 O and NO x . More recently, it has been suggested to add a layer of NH 3 -SCR active catalyst on the top of ammonia slip catalysts to increase N 2 selectivity.…”

Section: Generality Of Coaxial 3d Printing Zeolite-based Materialsmentioning

confidence: 99%

Coaxial 3D Printing of Zeolite‐Based Core–Shell Monolithic Cu‐SSZ‐13@SiO₂ Catalysts for Diesel Exhaust Treatment

et al. 2023

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Core–shell catalysts with functional shells can increase the activity and stability of the catalysts in selective catalytic reduction of NOx with ammoniax. However, the conventional approaches based on multistep fabrication for core–shell structures encounter persistent restrictions regarding strict synthesis conditions and limited design flexibility. Herein, a facile coaxial 3D printing strategy is for the first time developed to construct zeolite‐based core–shell monolithic catalysts with interconnected honeycomb structures, in which the hydrophilic noncompact silica serves as shell and Cu‐SSZ‐13 zeolite acts as core. Compared to a Cu‐SSZ‐13 monolith which suffers from the interfacial diffusion, the SiO2 shell layer can increase the accessibility of active sites over Cu‐SSZ‐13@SiO2, resulting in a 10–20% higher NO conversion at200−550 °C under 300 000 cm3 g−1 h−1. Meanwhile, a thicker SiO2 shell enhances the hydrothermal stability of the aged catalyst by inhibiting the dealumination and the formation of CuOx. Other representative monolithic catalysts with different topological zeolites as shell and diverse metal oxides as the core can be also realized by this coaxial 3D printing. This strategy allows multiple porous materials to be directly integrated, which allows for flexible design and fabrication of various core–shell monolithic catalysts with customized functionalities.

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Section: Generality Of Coaxial 3d Printing Zeolite-based Materialsmentioning

confidence: 99%

Coaxial 3D Printing of Zeolite‐Based Core–Shell Monolithic Cu‐SSZ‐13@SiO₂ Catalysts for Diesel Exhaust Treatment

et al. 2023

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“…An apparent desorption peak at 170-190 °C was observed for all of the samples, and this was ascribed to weakly acidic sites, such as defect sites (Si-OH, etc.) 35 . The desorption peak at 335-350 °C was attributed to the desorption of ammonia from medium acid sites 36 .…”

Section: Physicochemical Properties Of the Ni/zeolite Materialsmentioning

confidence: 99%

Toward the production of renewable diesel over robust Ni nanoclusters highly dispersed on a two-dimensional zeolite

Pang

Yang

et al. 2023

NPG Asia Mater

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Deoxygenation of bioderived lipids into renewable transportation fuels is a promising route to decreasing the dependence on fossil sources. Ni-based catalysts are high performing and cost-effective in deoxygenation reactions but suffer from severe sintering and aggregation. Herein, a ligand-chelating impregnation method was used to prepare highly dispersed Ni nanoclusters on a two-dimensional (2D) ITQ-2 zeolite. Comprehensive characterization was utilized to monitor the changes in the organometallic precursors during activation and to investigate their impact on the dispersion of the Ni nanoclusters on the ITQ-2 zeolite. The high external surface area and abundant surface defects of the 2D support enhanced the dispersion and immobilization of the Ni nanoclusters and outperformed conventional zeolites. The protection of the Ni2+ cations by the organic ligand suppressed the aggregation of Ni species during the activation processes, thereby leading to the formation of uniformly distributed Ni nanoclusters on the ITQ-2 zeolite. Due to the highly dispersed Ni nanoclusters and immobilization on the 2D zeolite, the Ni/ITQ-2-co material prepared by the ligand-chelating impregnation approach showed outstanding activity and stability for conversions of stearic acid or palm oil to diesel range alkanes. This work provides a rational design and precise modulation of metal-based catalysts for the production of renewable diesel.

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Section: Support Effectsmentioning

confidence: 99%

“…Although loaded Ag catalysts hold great promise for the selective catalytic oxidation of ammonia (NH 3 -SCO), they are currently limited in their catalytic performance because of the inability to manage the ratio of visible to active Ag species inside/on the carrier. Therefore, in the current study, the aim is to better understand how the microenvironment of zeolite contributes to the formation of Ag species, and a series of SSZ-13 zeolites with varying concentrations of ion exchange sites, surface areas of the zeolites, and defect sites were prepared by Qiu et al 74 and used for the loading of Ag species by these materials. As part of these carriers, SSZ-13 zeolites with varying Si/Al ratios and nano/micrometer sizing were incorporated into the system.…”

Section: Support Effectsmentioning

confidence: 99%

Review of the Catalytic System, Synthetic Process, and Support Morphological Research in Selective Catalytic Oxidation of Ammonia

Zhou,

Guan,

Guo

et al. 2023

Ind. Eng. Chem. Res.

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Tailoring the local environment of silver in SSZ-13 zeolites for low-temperature catalytic oxidation of ammonia

Cited by 6 publications

References 55 publications

Coaxial 3D Printing of Zeolite‐Based Core–Shell Monolithic Cu‐SSZ‐13@SiO₂ Catalysts for Diesel Exhaust Treatment

Coaxial 3D Printing of Zeolite‐Based Core–Shell Monolithic Cu‐SSZ‐13@SiO₂ Catalysts for Diesel Exhaust Treatment

Toward the production of renewable diesel over robust Ni nanoclusters highly dispersed on a two-dimensional zeolite

Review of the Catalytic System, Synthetic Process, and Support Morphological Research in Selective Catalytic Oxidation of Ammonia

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Tailoring the local environment of silver in SSZ-13 zeolites for low-temperature catalytic oxidation of ammonia

Cited by 6 publications

References 55 publications

Coaxial 3D Printing of Zeolite‐Based Core–Shell Monolithic Cu‐SSZ‐13@SiO2 Catalysts for Diesel Exhaust Treatment

Coaxial 3D Printing of Zeolite‐Based Core–Shell Monolithic Cu‐SSZ‐13@SiO2 Catalysts for Diesel Exhaust Treatment

Toward the production of renewable diesel over robust Ni nanoclusters highly dispersed on a two-dimensional zeolite

Review of the Catalytic System, Synthetic Process, and Support Morphological Research in Selective Catalytic Oxidation of Ammonia

Contact Info

Product

Resources

About

Coaxial 3D Printing of Zeolite‐Based Core–Shell Monolithic Cu‐SSZ‐13@SiO₂ Catalysts for Diesel Exhaust Treatment

Coaxial 3D Printing of Zeolite‐Based Core–Shell Monolithic Cu‐SSZ‐13@SiO₂ Catalysts for Diesel Exhaust Treatment