4.7 Article

Novel regenerated V- and Ce-mixed oxide modified catalysts for the NH3-SCR of NOx displaying a distinctive broad temperature window

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

New insights into the NH3-selective catalytic reduction of NO over Cu-ZSM-5 as revealed by operando spectroscopy

Xinwei Ye et al.

Summary: This study investigates the surface changes of Cu-ZSM-5 zeolite catalyst in the NH3-SCR reaction using in situ spectroscopy. It is found that Cu2+ forms complexes with NH3 at low temperatures and facilitates the reaction by forming high coverage nitrate intermediates. After steam treatment, [Cu-x(OH)(2x-1)](+) oligomers/clusters accumulate on the Cu-ZSM-5 surface, strongly adsorbing NH3 and nitrates/nitric acid at low temperatures, limiting the reaction. Additionally, NH3 and nitrates/nitric acid compete for shared adsorption sites, and selective tuning is achieved by prompt removal of nitrates/nitric acid with NO.

CATALYSIS SCIENCE & TECHNOLOGY (2022)

Article Engineering, Environmental

Unusual positive effect of SO2 on Mn-Ce mixed-oxide catalyst for the SCR reaction of NOx with NH3

JiaYu Chen et al.

Summary: The high-performance denitration catalyst based on Mn-Ce mixed-oxide demonstrated outstanding low-temperature activity and excellent SO2 tolerance, with abundant active sites and a porous structure. The introduction of SO2 enhanced catalytic activity and suppressed unwanted ammonia oxidation. The reaction pathway on the mixed oxide was confirmed to be the L-H mechanism based on in situ DRIFTS.

CHEMICAL ENGINEERING JOURNAL (2021)

Article Chemistry, Physical

Ti3+ doped V2O5/TiO2 catalyst for efficient selective catalytic reduction of NOx with NH3

Wei Zhao et al.

Summary: This study evaluates the effect of self-doping Ti3+ into catalysts on the activity of the catalysts. Various characterization methods such as XRD, XPS, and EPR confirm the presence of Ti3+ and oxygen vacancy, which significantly affect the performance of the catalysts. The results indicate potential for improving low-temperature SCR performance through strategic design of Ti3+ self-doped catalysts.

JOURNAL OF COLLOID AND INTERFACE SCIENCE (2021)

Article Chemistry, Multidisciplinary

New MoO3-CeO2-ZrO2 and WO3-CeO2-ZrO2 nanostructured mesoporous aerogel catalysts for the NH3-SCR of NO from diesel engine exhaust

Jihene Arfaoui et al.

Summary: Higher NO-SCR performances can be obtained between 200 and 500 degrees C over the new ternary MoO3-CeO2-ZrO2 and WO3-CeO2-ZrO2 catalysts. Above 90 % NO conversions into essentially N-2 (>= 97 %) are achieved between 350 and 500 degrees C over the most efficient MoO3-CeO2-ZrO2 ternary catalyst.

JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY (2021)

Article Chemistry, Physical

Improving the Performance of Gd Addition on Catalytic Activity and SO2 Resistance over MnOx/ZSM-5 Catalysts for Low-Temperature NH3-SCR

Jinkun Guan et al.

Summary: The Gd-modified MnOx/ZSM-5 catalysts showed excellent catalytic activity and SO2 resistance in low-temperature NH3-SCR reactions, attributed to their large surface area, abundant Mn4+ and surface oxygen species, strong reducibility, and suitable acidity. The addition of Gd inhibited the reaction between SO2 and MnOx active sites, leading to enhanced SO2 resistance. Furthermore, the mechanism of low-temperature SCR reactions over Mn/Z and GdMn/Z-0.3 was found to follow the Langmuir-Hinshelwood and Eley-Rideal mechanism, as revealed by in situ DRIFTS experiments.

CATALYSTS (2021)

Article Materials Science, Ceramics

Micro-mesoporous TiO2/SiO2 nanocomposites: Sol-gel synthesis, characterization, and enhanced photodegradation of quinoline

M. A. M. L. Jesus et al.

Summary: Micro-mesoporous TiO2/SiO2 nanocomposite powders were successfully synthesized using the sol-gel process, with Si60Ti40 powders exhibiting the highest specific surface area. Si80Ti20 powders showed better degradation of quinoline in the presence of H2O2 compared to pure sol-gel TiO2 powders, attributed to small TiO2 anatase crystallite size, high dispersion, great specific surface area, and formation of Ti-O-Si bond.

CERAMICS INTERNATIONAL (2021)

Article Engineering, Environmental

Deep removal of arsenic from regenerated products of spent V2O5-WO3/TiO2 SCR catalysts and its concurrent activation by bioleaching through a novel mechanism

Tianqi Niu et al.

Summary: This study attempted to use an active bioleaching liquor produced by Acidithiobacillus thiooxidans for the first time to deeply remove As from the regenerated product. Bioleaching resulted in maximal As removal of 53.1%, while H2SO4 leaching attained only 6.7% As removal and high As residue. The bioleaching also led to a stronger activation of the regenerated products, with a novel mechanism proposed to explain the excellent As removal based on nucleophilic attack of the sulfhydryl groups in cysteine.

CHEMICAL ENGINEERING JOURNAL (2021)

Article Engineering, Environmental

Revealing the effect of paired redox-acid sites on metal oxide catalysts for efficient NOx removal by NH3-SCR

Wei Tan et al.

Summary: The study revealed that the NH3-SCR activity of Nb2O5-CeO2 and WO3-CeO2 catalysts depends significantly on the strong interaction between the redox component (CeO2) and acidic component (Nb2O5 or WO3), as well as the presence of paired redox-acid sites. At lower temperatures (200 degrees Celsius), NH3-SCR activity is primarily influenced by the surface acidity of the catalysts, while at higher NOx conversion rates, the activity is more determined by the redox properties.

JOURNAL OF HAZARDOUS MATERIALS (2021)

Article Materials Science, Multidisciplinary

Tailored activity of Ce-Ni bimetallic modified V2O5/TiO2 catalyst for NH3-SCR with promising wide temperature window

Junqiang Xu et al.

Summary: A series of vanadium-based catalysts with different doping amounts of cerium and nickel were studied for NH3-SCR, with results showing that doping of nickel or cerium can enhance catalytic activity and widen the temperature window, and the co-modification catalyst possesses higher redox ability.

VACUUM (2021)

Article Chemistry, Multidisciplinary

Improvement of low-temperature NH3-SCR catalytic performance over nitrogen-doped MOx-Cr2O3-La2O3/TiO2-N (M = Cu, Fe, Ce) catalysts

Xiaoyi Sun et al.

Summary: The CeCrLa/TiO2-N catalyst with nitrogen doping showed the best low-temperature NH3-SCR activity, mainly influenced by its redox properties and surface acidity. Lewis acid sites were identified as the main adsorption sites for ammonia, and the catalyst mainly followed the L-H mechanism.

RSC ADVANCES (2021)

Review Engineering, Environmental

Advances in selective catalytic oxidation of ammonia (NH3-SCO) to dinitrogen in excess oxygen: A review on typical catalysts, catalytic performances and reaction mechanisms

Fengyu Gao et al.

Summary: The article summarizes various NH3-SCO catalysts with promising potential to reduce NH3 emissions, classifying them based on N-2-selectivity at different temperatures. It specifically highlights several promising copper-based catalysts, discusses reaction paths of NH3-SCO catalytic oxidation products, and emphasizes the importance of controlling NH3 dehydrogenation pathways.

JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING (2021)

Article Chemistry, Physical

Study of the nitric oxide reduction of SCR-NH3 on γFe2O3 catalyst surface with quantum chemistry

Dongdong Ren et al.

APPLIED SURFACE SCIENCE (2020)

Article Environmental Sciences

Effect of SiO2 addition on NH4HSO4 decomposition and SO2 poisoning over V2O5eMoO3/TiO2eCeO2 catalyst

Chengqiang Zheng et al.

JOURNAL OF ENVIRONMENTAL SCIENCES (2020)

Article Engineering, Environmental

Effect of hierarchical element doping on the low-temperature activity of manganese-based catalysts for NH3-SCR

Xiaolong Tang et al.

JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING (2020)

Article Engineering, Chemical

Role of cerium in improving NO reduction with NH3 over Mn-Ce/ASC catalyst in low-temperature flue gas

Shan Ren et al.

CHEMICAL ENGINEERING RESEARCH & DESIGN (2018)

Article Chemistry, Applied

SCR catalyst doped with copper for synergistic removal of slip ammonia and elemental mercury

Chuanmin Chen et al.

FUEL PROCESSING TECHNOLOGY (2018)

Article Chemistry, Applied

Fundamental chemistry of V-SCR catalysts at elevated temperatures

Soren B. Rasmussen et al.

CATALYSIS TODAY (2017)

Article Chemistry, Physical

Investigation on Fe-Co binary metal oxides supported on activated semi-coke for NO reduction by CO

Luyuan Wang et al.

APPLIED CATALYSIS B-ENVIRONMENTAL (2017)

Article Chemistry, Physical

Investigation of coating technology and catalytic performance over monolithic V2O5-WO3/TiO2 catalyst for selective catalytic reduction of NOx with NH3

Kun Zhao et al.

COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS (2016)

Article Chemistry, Physical

DRIFT and DFT study of cerium addition on SO2 of Manganese-based Catalysts for low temperature SCR

Lu Wei et al.

JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL (2016)

Article Chemistry, Physical

Deactivation and regeneration of a commercial SCR catalyst: Comparison with alkali metals and arsenic

Yue Peng et al.

APPLIED CATALYSIS B-ENVIRONMENTAL (2015)

Article Chemistry, Physical

Assignments of Bending Vibrations of Ammonia Adsorbed on Surfaces of Metal Oxides

Satoshi Suganuma et al.

CATALYSIS LETTERS (2015)

Article Chemistry, Physical

Novel effect of SO2 on the SCR reaction over CeO2: Mechanism and significance

Shijian Yang et al.

APPLIED CATALYSIS B-ENVIRONMENTAL (2013)

Article Engineering, Environmental

Improvement of Activity and SO2 Tolerance of Sn-Modified MnOx-CeO2 Catalysts for NH3-SCR at Low Temperatures

Huazhen Chang et al.

ENVIRONMENTAL SCIENCE & TECHNOLOGY (2013)

Article Chemistry, Physical

Influence of sulfation on iron titanate catalyst for the selective catalytic reduction of NOx with NH3

Fudong Liu et al.

APPLIED CATALYSIS B-ENVIRONMENTAL (2011)

Article Chemistry, Applied

XPS study of surface absorbed oxygen of ABO3 mixed oxides

Zhao Xin et al.

JOURNAL OF RARE EARTHS (2008)