A highly efficient Rh-modified Pd/Al2O3 close-coupled catalyst

Fang, Ruimei; Cui, Yajuan; Chen, Sijie; Shang, Hongyan; Shi, Zhuqun; Gong, Maochu; Chen, Yaoqiang

doi:10.1016/s1872-2067(14)60214-x

Cited by 10 publications

(3 citation statements)

References 33 publications

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“…To date, the most commonly used catalysts for the catalytic oxidation of light alkanes are supported Pt- and Pd-based catalysts. − However, recent studies have found that supported Ru catalysts can also deliver appropriate catalytic activities and even outperform Pt and Pd catalysts. − It has been reported that the active species are small RuO x clusters without well-defined stoichiometry and a few layers of thick surface oxide on the large Ru particles, while the crystalline RuO 2 phase is inactive . Thus, two common activation strategies are to partially oxidize Ru catalysts in continuous airflow at a relatively low temperature (250 °C) or partially reduce Ru catalysts in H 2 at 500 °C. − Although the Ru catalysts prepared using these two strategies exhibit high catalytic activity for propane oxidation, the stability of the active RuO x species is poor, exhibited by a decrease in propane conversion as combustion proceeds. , During the oxygen-rich reaction process, the small RuO x clusters prepared by calcination in air tend to sinter and crystallize into RuO 2 .…”

Section: Introductionmentioning

confidence: 99%

Regulating the Spatial Distribution of Ru Nanoparticles on CeO₂ Support for Enhanced Propane Oxidation

Sun

Ding

et al. 2022

ACS Appl. Nano Mater.

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Developing efficient catalysts for the total oxidation of propane at low temperatures is challenging; however, it is crucial for the purification of automotive exhaust and volatile organic compounds emitted in industrial processes. We report a highly stable and active Ru-based catalyst for propane oxidation by tuning Ru loading to achieve the balance between RuO x species in the CeO2 bulk and on the surface via a facile coprecipitation approach (Ru–CeO2). Compared to the Ru catalyst prepared through wet impregnation on a CeO2 support (Ru/CeO2), the prepared Ru–CeO2 catalyst allows for the formation of RuO x species with smaller particle sizes and lower oxidation states, as well as an increased number of oxygen vacancies on the catalyst surface, leading to a greater ability to adsorb and activate propane and oxygen. As a result, the Ru–CeO2 catalyst presents a substantially improved activity and durability toward propane oxidation, which can maintain 90% propane conversion at 220 °C for 50 h. This work highlights the synthetic tuning of the spatial distribution of Ru active sites within catalysts through a coprecipitation strategy for improved catalytic alkane oxidation, and the prepared Ru–CeO2 catalyst is a promising candidate material for industrial applications.

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Section: Introductionmentioning

confidence: 99%

Regulating the Spatial Distribution of Ru Nanoparticles on CeO₂ Support for Enhanced Propane Oxidation

Sun

Ding

et al. 2022

ACS Appl. Nano Mater.

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“…The catalytic total oxidation of methane has been in the focus of research for quite some time [4,5]. Many recent publications focus on palladium-containing catalysts or try to find other precious metal (PM) [12,[39][40][41][42][43][44][45] and PM-free catalysts [46][47][48][49][50][51][52][53][54][55].…”

Section: Introductionmentioning

confidence: 99%

A High-Throughput Screening Approach to Identify New Active and Long-Term Stable Catalysts for Total Oxidation of Methane from Gas-Fueled Lean–Burn Engines

et al. 2020

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A unique high-throughput approach to identify new catalysts for total oxidation of methane from the exhaust gas of biogas-operated lean-burn engines is presented. The approach consists of three steps: (1) A primary screening using emission-corrected Infrared Thermography (ecIRT). (2) Validation in a conventional plug flow gas phase reactor using a model exhaust gas containing CH4, O2, CO, CO2, NO, NO2, N2O, SO2, H2O. (3) Ageing tests using a simplified exhaust gas (CH4, O2, CO2, SO2, H2O). To demonstrate the efficiency of this approach, one selected dataset with a sol-gel-based catalysts is presented. Compositions are 3 at.% precious metals (Pt, Rh) combined with different amounts of Al, Mn, and Ce in the form of mixed oxides. To find new promising materials for the abatement of methane, about two thousand different compositions were synthesized and ranked using ecIRT, and several hundred were characterized using a plug flow reactor and their ageing behaviour was determined.

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“…Thus, for Pd‐Rh bimetallic systems, it is important to understand and make appropriate use of the interaction between Pd and Rh . Recently Pd‐Rh bimetallic systems have been proven to have a synergistic effect on both the oxidation of CO/HC and the reduction of NO; Rh could stabilize the particle size, the oxidation state, and the activity of Pd . However, Pd‐Rh alloys may be generated as a result of thermal deactivation when a relatively strong interaction between Pd and Rh exists, which may consequently generate an undesirable negative influence on the catalytic function .…”

Section: Introductionmentioning

confidence: 99%

Optimally designed synthesis of advanced Pd‐Rh bimetallic three‐way catalyst

Chen²,

et al. 2019

Can J Chem Eng

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For Pd‐Rh bimetallic three‐way catalysts, appropriate Pd‐Rh interaction is of significant importance to the catalytic activity. In this work, an optimally designed approach was utilized to synthesize Pd‐Rh bimetallic catalyst supported on CeO2‐ZrO2‐Al2O3 (Rh/CZ/Pd/A), which was compared with the conventional catalysts prepared by mechanical mixing method and co‐impregnation technique. In Rh/CZ/Pd/A, Rh species are distributed on the external surface of CZ, while Pd species are distributed in the inner layer. Upon the application of the hydrothermal aging treatment, Pd species undergo migration to the outer sphere of CZ grains. Meanwhile, modified Pd‐Rh interaction and metal‐support interaction are obtained, which are efficient for stabilizing PdO and Rh2O3 at high temperatures, as well as suppressing the deactivation of Rh species by diffusing into the support. Overall, smaller size, better dispersion, along with the higher oxidation state of Pd species and the more reducible oxidation state of Rh species are maintained for Rh/CZ/Pd/A‐a. Consequently, improved three‐way catalytic activity is achieved for Rh/CZ/Pd/A especially after the hydrothermal aging treatment.

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A highly efficient Rh-modified Pd/Al2O3 close-coupled catalyst

Cited by 10 publications

References 33 publications

Regulating the Spatial Distribution of Ru Nanoparticles on CeO₂ Support for Enhanced Propane Oxidation

Regulating the Spatial Distribution of Ru Nanoparticles on CeO₂ Support for Enhanced Propane Oxidation

A High-Throughput Screening Approach to Identify New Active and Long-Term Stable Catalysts for Total Oxidation of Methane from Gas-Fueled Lean–Burn Engines

Optimally designed synthesis of advanced Pd‐Rh bimetallic three‐way catalyst

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A highly efficient Rh-modified Pd/Al2O3 close-coupled catalyst

Cited by 10 publications

References 33 publications

Regulating the Spatial Distribution of Ru Nanoparticles on CeO2 Support for Enhanced Propane Oxidation

Regulating the Spatial Distribution of Ru Nanoparticles on CeO2 Support for Enhanced Propane Oxidation

A High-Throughput Screening Approach to Identify New Active and Long-Term Stable Catalysts for Total Oxidation of Methane from Gas-Fueled Lean–Burn Engines

Optimally designed synthesis of advanced Pd‐Rh bimetallic three‐way catalyst

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Regulating the Spatial Distribution of Ru Nanoparticles on CeO₂ Support for Enhanced Propane Oxidation

Regulating the Spatial Distribution of Ru Nanoparticles on CeO₂ Support for Enhanced Propane Oxidation