Zeolite-based materials eliminating nitrogen oxides (NO_x) and volatile organic compounds (VOCs): advances and future perspectives

Catalysis Science & Technology, Год журнала: 2024, Номер 14(17), С. 4756 - 4774

Опубликована: Янв. 1, 2024

Advances and future perspectives of zeolite-based materials in adsorption catalytic conversion NO x VOCs were reported.

Язык: Английский

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Toward synergetic reduction of pollutant and greenhouse gas emissions from vehicles: a catalysis perspective

Chemical Society Reviews, Год журнала: 2024, Номер unknown

Опубликована: Дек. 17, 2024

It is a great challenge for vehicles to satisfy the increasingly stringent emission regulations pollutants and greenhouse gases. Throughout history of development vehicle control technology, catalysts have always been in core position aftertreatment. Aiming address significant demand synergistic gases from vehicles, this review provides panoramic view technologies key aftertreatment using fossil fuels (gasoline, diesel, natural gas) carbon-neutral (hydrogen, ammonia, green alcohols). Special attention will be given research advancements catalysts, including three-way (TWCs), NO

Язык: Английский

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Achieving High Dispersion of Pd in Small-Pore Zeolite SSZ-13: A High-Efficiency Low-Temperature NOx Adsorber

ACS Omega, Год журнала: 2024, Номер 9(28), С. 30452 - 30460

Опубликована: Июль 5, 2024

Passive NOx adsorber (PNA) materials are primarily considered for reducing nitrogen oxide emissions during the low-temperature cold start of a motor vehicle. Pd/SSZ-13 has attracted considerable attention because its outstanding hydrothermal stability and sulfur resistance. Optimizing dispersion precious metal Pd in is crucial enhancing PNA performance adsorption capability. In this study, we prepared using different methods evaluated their influence on The characterization results show that catalyst by quantitative ion-exchange method as high 92.13%, loading amount 98.93%. predominantly exists Pd2+, achieving near-total further improving catalyst's capacity. This study offers innovative approaches applying material, serving reference optimization enhancement. Continued research into preparation could offer solutions to reduce vehicle emissions.

Язык: Английский

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Efficient nitric oxide capture and reduction on Ni-loaded CHA zeolites

Green Energy & Environment, Год журнала: 2024, Номер 9(12), С. 1857 - 1865

Опубликована: Янв. 1, 2024

As a prominent contributor to air pollution, nitric oxide (NO) has emerged as critical agent causing detrimental environmental and health ramifications. To mitigate emissions facilitate downstream utilization, adsorption-based techniques offer compelling approach for direct NO capture from both stationary mobile sources. In this study, comprehensive exploration of under oxygen-lean oxygen-rich conditions was conducted, employing Ni ion-exchanged chabazite (CHA-type) zeolites the adsorbents. Remarkably, Ni/Na-CHA zeolites, with loadings ranging 3 4 wt%, demonstrate remarkable dynamic uptake capacities exhibit exceptional efficiencies (NO-to-Ni ratio) (0.17–0.31 mmol/g, 0.32–0.43 NO/Ni) (1.64–1.18 mmol/g) ambient conditions. An NH3 reduction methodology designed regeneration absorbents at relatively low temperature 673 K. Comprehensive insights into NOx adsorption mechanism were obtained through temperature-programmed desorption experiments, in situ Fourier transform infrared spectroscopy, density functional theory calculations. It is unveiled that NO2 propensity coordinate Ni2+ via N-terminal or O-terminal, yielding thermally stable complexes metastable species, respectively, while low-temperature substances are generated close proximity Na+. This study not only offers micro-level perspectives but imparts crucial advancement technologies utilizing precious-metal-free materials.

Язык: Английский

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Unveiling the roles of distinct active sites over Pd/SSZ-13 for low-temperature NOx adsorption

Applied Surface Science, Год журнала: 2024, Номер 659, С. 159938 - 159938

Опубликована: Март 18, 2024

Язык: Английский

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Coaxial 3D Printing Enabling Mn/CHA@Pd/CHA Zeolite‐Based Core–Shell Monoliths for Efficient Passive NO_x Adsorbers

Advanced Functional Materials, Год журнала: 2024, Номер 34(51)

Опубликована: Авг. 28, 2024

Abstract Pd‐based zeolites are extensively used as passive NO x adsorbers (PNA) for cold‐start emissions to meet stringent emission regulations. However, optimizing adsorber design reduce Pd usage with substitution by non‐noble metals that prone suffer from H 2 O remains a significant challenge. Herein, the core–shell Mn/CHA@Pd/CHA zeolite monoliths based on metal/zeolite core constructed using coaxial 3D printing technology and identified efficient first time. In monolith, Pd/CHA shell effectively protected Mn active sites in O, while integration of Mn/CHA not only introduced storage but also facilitated desorption, thereby achieving comparable adsorption properties increased desorption efficiency 35% at 350 °C compared monolith. Furthermore, some metal‐based (e.g., Co/CHA, Mn/MFI, Mn/BEA) Pd/AEI) employed cores shells respectively fabricate series via printing, highlighting benefits incorporating into improving behaviors. This work provides promising strategy designing cost‐effective PNA materials contributes exhaust after‐treatment technology.

Язык: Английский

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Constructing a NOx adsorption/reduction bifunctional Pd/Cu-SSZ-13 for denitrification at all temperatures

Chemical Engineering Journal, Год журнала: 2024, Номер 503, С. 158371 - 158371

Опубликована: Дек. 6, 2024

Язык: Английский

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An Assessment of Zeolite Framework Effect for Low-Temperature NOX Adsorbers

Catalysts, Год журнала: 2023, Номер 13(6), С. 962 - 962

Опубликована: Июнь 1, 2023

Pd-promoted zeolites (Y, ZSM-5, FER, SSZ-13) were prepared and characterized to analyze their properties as low-temperature NOx adsorbers. The samples investigated by BET XRD in situ FT-IR spectroscopy of CO NO adsorption probe the Pd sites nature adsorbed species. adsorption/desorption performances at low temperatures examined microreactor measurements upon NO/O2 followed TPD presence water carbon dioxide. It was enlightened that: (i) zeolite framework influences dispersion: smaller cage, higher dispersion, irrespective Si/Al ratio. Accordingly, following dispersion order has been observed, inversely cage size: Pd/SSZ-13 > Pd/ZSM-5 ~ Pd/FER >> Pd/Y; (ii) is present isolated Pdn+ species PdOx particles; (iii) governs storage capacity: capacity; (iv) adsorbs mainly form nitrosyls nitrates; (v) desorption occurs both a temperature below 200 °C high-temperature range (near 350 °C).

Язык: Английский

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Na Cocations and Hydrothermal Aging Cooperatively Boost the Regeneration of Phosphorus-Poisoned Pd/SSZ-13 for Passive NO_x Adsorption

Environmental Science & Technology, Год журнала: 2023, Номер 57(48), С. 19956 - 19964

Опубликована: Ноя. 10, 2023

Pd/SSZ-13 has been proposed as a passive NOx adsorber (PNA) for low-temperature adsorption. However, it remains challenging to work efficiently when suffering from phosphorus poisoning. Herein, we report simple and efficient strategy regenerate the phosphorus-poisoned based on cooperation between hydrothermal aging treatment Na cocations. It was found that enabled redispersion of Pd P-containing species in Pd/SSZ-13. Meanwhile, presence cocations significantly reduced formation AlPO4 retained more paired Al sites highly dispersed Pd2+ ions, which great importance recovery adsorption performance. To our satisfaction, restoration ratio capacity poisoned >90% after regeneration. Strikingly, activities with loadings 0.2 0.4 mmol g-1 almost completely recovered upon This study demonstrates promoting effect regeneration by treatment, provides useful guidance design PNA materials excellent durability cold-start application.

Язык: Английский

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Engineering 2D Mg-Al-layered double oxides with highly dispersed and enhanced basic sites for efficient ambient NO2 reactive removal

Catalysis Today, Год журнала: 2024, Номер 433, С. 114664 - 114664

Опубликована: Март 23, 2024

Язык: Английский

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