4.8 Article

Insight into the Promotion Effect of Trace Pd Doping on the Catalytic Performance of Ag/Al2O3 for C3H6-SCR of NOx

相关参考文献

注意:仅列出部分参考文献,下载原文获取全部文献信息。
Article Chemistry, Physical

Anchoring Pt-doped PdO nanoparticles on γ-Al2O3 with highly dispersed La sites to create a methane oxidation catalyst

Zhi Liu et al.

Summary: We prepared a PtPd-La1/Al2O3 catalyst with highly dispersed La species and Pt-PdO nanoparticles, showing significantly enhanced hydrothermal and long-term stability under the harsh conditions of simulated natural gas vehicle (NGV) exhaust. PdO nanoparticles can be anchored by highly dispersed La sites through electron transfer, inhibiting the sintering of Pd species during hydrothermal aging. Pt uniformly doped in PdO creates high-efficiency Pt sites and unsaturated Pd sites for water-resistance, further enhancing long-term stability. This work provides the potential to resolve tough challenges related to methane emission control on NGVs.

APPLIED CATALYSIS B-ENVIRONMENTAL (2023)

Article Chemistry, Physical

Excellent hydrocarbon tolerance of CeO2-WO3-SnO2 oxide catalyst for the NH3-SCR of NOx

Jingjing Liu et al.

Summary: The HC resistance of CeWSnOx, V2O5-WO3/TiO2, and Cu-SSZ-13 catalysts was studied using propene, toluene, and n-pentane as model HCs. The CeWSnOx catalyst showed much better HC tolerance due to its strong HC oxidation capacity, which inhibited side reactions. In contrast, Cu-SSZ-13 and V2O5-WO3/TiO2 showed undesired HC ammoxidation reactions, especially in the presence of propene.

APPLIED CATALYSIS B-ENVIRONMENTAL (2023)

Article Chemistry, Physical

?-Al2O3 supported silver nanoparticle applied in C3H8-SCR: Nanosphere and nanoflake

Xinwei Yang et al.

Summary: The γ-Al2O3 support was used to support Ag nanoparticles, and the Ag/Al2O3-flake exhibited superior catalytic activity in C3H8-SCR compared to Ag/Al2O3-sphere. The Al2O3-flake with more Al octacoordinated ions promoted the dispersion of Agn δ+ species on Ag/Al2O3-flake. The Agn δ+ species strengthened the low-temperature catalytic activity for HC-SCR, while Ag metal particles were unbeneficial.

CATALYSIS COMMUNICATIONS (2023)

Article Chemistry, Physical

How many data points and how large an R-squared value is essential for Arrhenius plots?

Kenji Taira et al.

Summary: Arrhenius plots estimate the apparent activation energy (Ea) of catalytic reactions. Statistical analysis quantitatively visualized the relationship between the number of data points (np), R-squared value (r2), and the reliability of Ea, suggesting that np≥5 is required for a reliable Ea. Furthermore, a minimum required r2 was formulated to claim statistical difference between two values of Ea. This study provides tangible and quantitative guidance for controlling the reliability of the Arrhenius plot.

JOURNAL OF CATALYSIS (2023)

Article Chemistry, Physical

Steering the structure and reactivity of Ag/Al2O3 by the addition of multi-functional WOx for NOx reduction by ethanol

Jungseob So et al.

Summary: AgW/Al2O3 exhibits higher reactivity for ethanol SCR compared to Ag/Al2O3 throughout the entire reaction temperature range. STEM-EDS confirms the hierarchical structure of AgW/Al2O3 with highly dispersed W on Al2O3 and narrow size distribution of Ag species in contact with W. UV-vis, H2-TPR, and DRIFT results show that abundant metallic Ag in AgW/Al2O3 accelerates the activation of ethanol into acetaldehyde at low to medium temperatures, while ethylene formed over W-induced Bronsted acid sites contributes to high-temperature deNOx capacity. DFT calculations support the higher reactivity of AgW/Al2O3 towards acetaldehyde formation, with predominantly metallic Ag and Ag ionically bonded with WO3 predicted as the active phases.

APPLIED CATALYSIS B-ENVIRONMENTAL (2023)

Article Engineering, Environmental

Revealing the Synergistic Deactivation Mechanism of Hydrothermal Aging and SO2 Poisoning on Cu/SSZ-13 under SCR Condition

Yani Zhang et al.

Summary: This study investigated the synergistic deactivation mechanism of hydrothermal aging and SO2 poisoning on Cu/SSZ-13 under SCR condition. Hydrothermal aging induces more severe degradation of SCR performance, and the presence of SO2 during hydrothermal aging causes further worse SCR performance. Hydrothermal aging damages Si-OH-Al sites and induces the formation of CuO/CuAlOx species, while SO2 poisoning promotes the transformation of ZCuOH to Z(2)Cu.

ENVIRONMENTAL SCIENCE & TECHNOLOGY (2022)

Article Engineering, Environmental

Abatement of Nitrogen Oxides via Selective Catalytic Reduction over Ce1-W1Atom-Pair Sites

Xue Fang et al.

Summary: This study investigates the synergy between Ce and W in selective catalytic reduction (SCR) by designing a Ce1-W1/TiO2 model catalyst. The strong electronic interaction within Ce1-W1 atom pairs is found to enhance the SCR performance of Ce1-W1/TiO2 catalysts.

ENVIRONMENTAL SCIENCE & TECHNOLOGY (2022)

Article Chemistry, Physical

Mechanistic insight into the selective catalytic reduction of NOx with propene on the Ce0.875Zr0.125O2 (110) surface

Xuesong Cao et al.

Summary: In this study, a SCR-C3H6 reaction mechanism is proposed on the Ce0.875Zr0.125O2 (110) surface using periodic density functional theory (DFT) method. The simulation results are in good agreement with experimental values. Some catalytic characteristics, such as the adsorption modes of NO3 on the surface and the activity sequence of C3H6, are also discovered.

CATALYSIS SCIENCE & TECHNOLOGY (2022)

Article Chemistry, Multidisciplinary

De-NOx characteristics of HC-SCR system employing combined Ag/Al2O3 and CuSn/ZSM-5 catalyst

Kyungseok Lee et al.

Summary: The combination of Ag/Al2O3 and CuSn/ZSM-5 showed superior catalytic performance in reducing NOx and oxidizing C3H6 at lower temperatures. Sequential arrangement of 1Ag/Al2O3 + 2Cu1Sn/ZSM-5 was found to be the best catalytic configuration for simultaneous reduction of NOx, C3H6, and H-2 over a wide temperature range. The reduced NOx was mostly converted to N-2 with minimal generation of N2O, NH3, and HCNO.

JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY (2021)

Article Engineering, Environmental

Reaction Pathways of Standard and Fast Selective Catalytic Reduction over Cu-SSZ-39

Na Zhu et al.

Summary: Cu-SSZ-39 shows excellent hydrothermal stability and is expected to be used for NOx purification in diesel vehicles. The presence of NO2 can improve the NOx conversion of Cu-SSZ-39, especially for catalysts with low Cu loadings. The kinetic studies reveal that NO2 can promote the SCR reaction over Cu-SSZ-39 by facilitating the formation of surface nitrate species.

ENVIRONMENTAL SCIENCE & TECHNOLOGY (2021)

Review Multidisciplinary Sciences

Selective catalytic reduction of NOx with NH3: opportunities and challenges of Cu-based small-pore zeolites

Yulong Shan et al.

Summary: This review article summarizes the major advances of Cu-SSZ-13 in the NH3-SCR reaction, including insights into the matching between SCR catalyst design principles and the characteristics of Cu2+-exchanged zeolitic catalysts. It proposes principles for designing zeolites with excellent performance and stability, while also addressing the challenges faced by Cu-based small-pore zeolites.

NATIONAL SCIENCE REVIEW (2021)

Article Chemistry, Multidisciplinary

HC-SCR system combining Ag/Al2O3 and Pd/Al2O3 catalysts with resistance to hydrothermal aging for simultaneous removal of NO, HC, and CO

Kyungseok Lee et al.

Summary: A combined Ag/Al2O3 and Pd/Al2O3 catalyst was found to be effective for the selective catalytic reduction of NOx by H-2-assisted C3H6. The sequential arrangement of 1 wt% Ag/Al2O3 followed by 1Pd/Al2O3 enabled the reduction of NOx, C3H6, CO, and H-2 over wide reaction temperatures, with negligible formation of by-products.

JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY (2021)

Article Chemistry, Physical

Composite Cu-SSZ-13 and CeO2-SnO2 for enhanced NH3-SCR resistance towards hydrocarbon deactivation

Ferenc Martinovic et al.

Summary: A composite catalyst formed by mixing Cu-SSZ-13 with CeO2-SnO2 through solid-state synthesis showed resistance to hydrocarbon poisoning in NH3-mediated NOx-SCR reaction. The addition of CeO2-SnO2 enhanced the resistance towards propylene poisoning, with the primary active sites playing a complex role in preventing hydrocarbon poisoning. The mechanism proposed for deactivation and poisoning prevention involved HONO/nitrate intermediates formed over CeO2-SnO2 re-activating the zeolitic copper for SCR reaction, highlighting the importance of the interaction between different active sites.

APPLIED CATALYSIS B-ENVIRONMENTAL (2021)

Article Chemistry, Multidisciplinary

Terminal Hydroxyl Groups on Al2O3 Supports Influence the Valence State and Dispersity of Ag Nanoparticles: Implications for Ozone Decomposition

Xufei Shao et al.

Summary: In this study, 10%Ag/nano-Al2O3 and 10%Ag/AlOOH-900 catalysts were synthesized by the impregnation method for ozone decomposition. The 10%Ag/nano-Al2O3 catalyst showed higher ozone conversion compared to 10%Ag/AlOOH-900, indicating that Ag nanoparticles dispersed on nano-Al2O3 were the active sites for ozone decomposition. Understanding the dispersion and valence of silver species gained in this study will be beneficial for designing more efficient supported silver catalysts in the future.

ACS OMEGA (2021)

Article Chemistry, Applied

Effect of the modification of alumina supports with chloride on the structure and catalytic performance of Ag/Al2O3 catalysts for the selective catalytic reduction of NOx with propene and H2/propene

Jia Wang et al.

Summary: Modification of alumina support with chloride facilitates the formation of oxidized silver species that catalyze the oxidation of hydrocarbons into acetate species, promoting the SCR reaction. The presence of silver species enhances the decomposition of adsorbed nitrates on the catalyst surface, leading to low-temperature promotion of the SCR reaction with hydrogen as a reductant. Acrylonitrile was identified as a gaseous intermediate in the H-2/C3H6-SCR reaction.

CHINESE JOURNAL OF CATALYSIS (2021)

Article Engineering, Environmental

Tuning the Chemical State of Silver on Ag-Mn Catalysts to Enhance the Ozone Decomposition Performance

Xiaotong Li et al.

ENVIRONMENTAL SCIENCE & TECHNOLOGY (2020)

Article Chemistry, Physical

Insight into the origin of sulfur tolerance of Ag/Al2O3 in the H2-C3H6-SCR of NOx

Guangyan Xu et al.

APPLIED CATALYSIS B-ENVIRONMENTAL (2019)

Review Chemistry, Multidisciplinary

Alumina: discriminative analysis using 3D correlation of solid-state NMR parameters

C. Vinod Chandran et al.

CHEMICAL SOCIETY REVIEWS (2019)

Article Chemistry, Physical

Silver Valence State Determines the Water Tolerance of Ag/Al2O3 for the H2-C3H6-SCR of NOx

Guangyan Xu et al.

JOURNAL OF PHYSICAL CHEMISTRY C (2018)

Article Chemistry, Physical

Cu-SSZ-13 as pre-turbine NOx-removal-catalyst: Impact of pressure and catalyst poisons

Tobias Guenter et al.

APPLIED CATALYSIS B-ENVIRONMENTAL (2016)

Article Chemistry, Applied

Effects of CO, H2 and C3H6 on Cu-SSZ-13 catalyzed NH3-SCR

Yang Zheng et al.

CATALYSIS TODAY (2016)

Article Chemistry, Physical

Discerning the Role of Ag-O-Al Entities on Ag/γ-Al2O3 Surface in NOx Selective Reduction by Ethanol

Hua Deng et al.

JOURNAL OF PHYSICAL CHEMISTRY C (2015)

Article Chemistry, Physical

Magnesia doped Ag/Al2O3 - Sulfur tolerant catalyst for low temperature HC-SCR of NOx

Pavan M. More et al.

APPLIED CATALYSIS B-ENVIRONMENTAL (2014)

Article Chemistry, Physical

A common feature of H-2-assisted HC-SCR over Ag/Al2O3

Yunbo Yu et al.

CATALYSIS SCIENCE & TECHNOLOGY (2014)

Article Chemistry, Physical

Remarkable activity of Ag/Al2O3/cordierite catalysts in SCR of NO with ethanol and butanol

Pavlo Kyriienko et al.

APPLIED CATALYSIS B-ENVIRONMENTAL (2013)

Article Chemistry, Physical

DeNOx performance of Ag/Al2O3 catalyst using simulated diesel fuel-ethanol mixture as reductant

Mun Kyu Kim et al.

APPLIED CATALYSIS B-ENVIRONMENTAL (2011)

Article Chemistry, Applied

Effect of hydrocarbon slip on NO removal activity of CuZSM5, FeZSM5 and V2O5/TiO2 catalysts by NH3

Iljeong Hee et al.

MICROPOROUS AND MESOPOROUS MATERIALS (2011)

Article Chemistry, Physical

Mechanism of the selective catalytic reduction of NOx by C2H5OH over Ag/Al2O3

YB Yu et al.

APPLIED CATALYSIS B-ENVIRONMENTAL (2004)

Article Chemistry, Physical

Novel Pd promoted Ag/Al2O3 catalyst for the selective reduction of NOx

H He et al.

APPLIED CATALYSIS B-ENVIRONMENTAL (2003)