Synthesis of Zeolitic Vanadotungstate with Trigonal Symmetry for Methane Oxidation to Methanol DOI

Ting Gou,

Zhuoyuan Chen,

Guijin Zheng

и другие.

Inorganic Chemistry, Год журнала: 2025, Номер unknown

Опубликована: Июнь 5, 2025

Zeolitic octahedral metal oxide is a potentially good catalyst due to its redox property and microporosity. The structure chemical composition of material affect catalytic activity, therefore tuning these properties very important. Herein, the zeolitic based on vanadotungstate was studied in detail. investigation into formation indicated that tungstate reacts with VOSO4 form [W4O16]8- cubane units, K+ led cubic symmetry (VT-1), trimethylamine isomeric trigonal (VT-5). VT-5 an effective for selective oxidation methane methanol water at low temperature (90 °C), using only molecular oxygen as oxidant. Methane effectively converted high selectivity. microporosity reduced V site were critical achieving performance.

Язык: Английский

Optimizing the reaction pathway of methane photo-oxidation over single copper sites DOI Creative Commons
Chengyang Feng, Shouwei Zuo, Hu Miao

и другие.

Nature Communications, Год журнала: 2024, Номер 15(1)

Опубликована: Окт. 21, 2024

Язык: Английский

Процитировано

19
The green chemistry paradigm in modern organic synthesis DOI
Sergei G. Zlotin, Ksenia S. Egorova, Valentine P. Ananikov

и другие.

Russian Chemical Reviews, Год журнала: 2023, Номер 92(12), С. RCR5104 - RCR5104

Опубликована: Дек. 1, 2023

After the appearance of green chemistry concept, which was introduced in vocabulary early 1990s, its main statements have been continuously developed and modified. Currently, there are 10–12 cornerstones that should form basis for an ideal chemical process. This review analyzes accumulated experience achievements towards design products processes reduce or eliminate use generation hazardous substances. The presents views leading Russian scientists specializing various fields this subject, including homogeneous heterogeneous catalysis, fine basic organic synthesis, electrochemistry, polymer chemistry, based on bio-renewable feedstocks energetic compounds materials. A new approach to quantitative evaluation environmental friendliness by authors is described. <br> bibliography includes 1761.

Язык: Английский

Процитировано

41
Strategic assembly of active phases on Co-Fe bimetallic catalysts for efficient Fischer-Tropsch synthesis DOI
Yunhao Liu, Qingpeng Cheng, Shuaishuai Lyu

и другие.

Chemical Engineering Journal, Год журнала: 2024, Номер 494, С. 152936 - 152936

Опубликована: Июнь 11, 2024

Язык: Английский

Процитировано

10
Direct Methane to Methanol Conversion: An Overview of Non‐Syn Gas Catalytic Strategies DOI Creative Commons

Anjana Rajeev,

Thasnim P Mohammed,

Akhila George

и другие.

The Chemical Record, Год журнала: 2025, Номер unknown

Опубликована: Янв. 16, 2025

Abstract Direct methane to methanol conversion is a dream reaction in industrial chemistry, which takes inspiration from the biological production catalysed by monooxygenase enzymes (MMOs). Over years, extensive studies have been conducted on this topic bioengineering MMOs, and tailoring methods isolate MMOs active form. Similarly, remarkable achievements noted other activation strategies such as use of heterogeneous catalysts or molecular catalysts. In review, we outline metabolism performed methanotrophs detail latest advancements site structures catalytic mechanisms both types MMOs. Also, recent progress bioinspired approaches using various catalysts, especially first‐row transition metal zeolites mechanistic insights are discussed. addition, complexes “Periana catalyst” for through methyl ester formation presence strong acids also detailed. Compared zeolites‐mediated field, utilisation application still its nascent phase further research required overcome limitations these effectively.

Язык: Английский

Процитировано

2
Zinc Migration Mediates Isolated [PtFe3] in Zeolite for Propane Dehydrogenation DOI
Mingrui Xu, Bofeng Zhang, Rongrong Zhang

и другие.

ACS Catalysis, Год журнала: 2025, Номер unknown, С. 3215 - 3226

Опубликована: Фев. 7, 2025

Structural transformation under in situ reaction conditions plays a vital role heterogeneous catalytic performance, especially caused by metal migration. However, the migration of active components often leads to irreversible structural disruption at high temperatures, which could be associated with deactivation catalysts. Here, we report low-melting-point Zn migration-mediated strategy synthesize ultrastable isolated PtFe3 sites anchored MFI zeolite for propane direct dehydrogenation. The optimized catalyst exhibited superior specific activity 36.5 mol C3H6 molPt–1 s–1 propylene selectivity above 99% 550 °C. Moreover, dehydrogenation remained stable after over 400 h on stream low rate constant 0.001 h–1 industrial 580 In characterizations demonstrated that Fe3+ species were conducive rearrangement electronic configuration unoccupied 5d states Pt atoms form electron-deficient sites. This afford insights into dynamic evolution preparation processes.

Язык: Английский

Процитировано

2
Effect of CO2 Co-Feeding on the Stabilization of Atomically Dispersed Iron Species over MgAl2O4 During Ethane Dehydrogenation Reactions DOI
Yingbin Zheng, Junjie Li, Xinbao Zhang

и другие.

ACS Catalysis, Год журнала: 2023, Номер 13(16), С. 11153 - 11163

Опубликована: Авг. 8, 2023

Ethane dehydrogenation provides an opportunity for the effective utilization of shale gas and production ethene. Up to now, it is still a great challenge acquire stable ethane catalyst operated under high temperature reductive atmospheres. In this study, we prepared Fe-based supported on MgAl2O4 with atomically dispersed iron species even after 6 reaction–regeneration cycles. Sheet-like morphology spinel structure beneficial dispersion Fe species. The undergoes reduction, sintering, detachment during reaction, as evidenced by in situ High-Angle Annular Dark-Field Scanning Transmission Electron Microscopy quasi-in 57Fe Mössbauer spectroscopy. By contrast, introduction CO2 leads slow deactivation, where only partial reduction isolated Fe3+ Fe2+ was observed. And activity could be restored simple O2 treatment. current work sheds light design high-efficient catalysts.

Язык: Английский

Процитировано

22
Zeolite-based materials for greenhouse gas capture and conversion DOI
Qiang Zhang, Jialiang Li, Li Li

и другие.

Science China Chemistry, Год журнала: 2024, Номер unknown

Опубликована: Сен. 9, 2024

Язык: Английский

Процитировано

9
Conversion of Polypropylene into Light Hydrocarbons and Aromatics by Metal Exchanged Zeolite Catalysts DOI

Ozge Deniz Bozkurt,

Hilal Ezgi Toraman

Langmuir, Год журнала: 2024, Номер 40(18), С. 9636 - 9650

Опубликована: Апрель 24, 2024

Polyolefins can be converted into C

Язык: Английский

Процитировано

7
Hydrothermal Aging Enhances Nitrogen Oxide Reduction over Iron-Exchanged Zeolites at 150 °C DOI
Xuechao Tan, Pablo García-Aznar, Germán Sastre

и другие.

Journal of the American Chemical Society, Год журнала: 2024, Номер 146(9), С. 6352 - 6359

Опубликована: Фев. 22, 2024

Ammonia selective catalytic reduction (NH3-SCR) over copper- and iron-exchanged zeolites is a state-of-the-art technology for removal of nitrogen oxides (NOx, NO, NO2) from exhaust emissions but suffers poor low-temperature (i.e., 150 °C) activity. Here we show that hydrothermal aging Fe-beta, Fe-ZSM-5, Fe-ferrierite at 650 °C or higher leads to remarkable increase in NOx conversion ∼30 ∼80% under fast NH3-SCR conditions °C. The practical relevance this finding becomes more evident as an aged Fe-beta/fresh Cu-SSZ-13 composite catalyst exhibits ∼90% conversion. We propose neutral heteronuclear bis-μ-oxo ironaluminum dimer might be created within iron during catalyze ammonium nitrate by NO Density functional theory calculations reveal the activation free energy (125 versus 147 kJ mol–1) reaction with adsorbed NO3– species, rate-determining step reduction, considerably lower on site than well-known mononuclear iron–oxo cation site, thus greatly enhancing overall SCR

Язык: Английский

Процитировано

6
Revealing Active Sites and Reaction Pathways in Direct Oxidation of Methane over Fe-Containing CHA Zeolites Affected by the Al Arrangement DOI Creative Commons
Peipei Xiao, Lizhuo Wang,

Hiroto Toyoda

и другие.

Journal of the American Chemical Society, Год журнала: 2024, Номер 146(46), С. 31969 - 31981

Опубликована: Ноя. 5, 2024

Fe-containing zeolites are effective catalysts in converting the greenhouse gases CH4 and N2O into valuable chemicals. However, activities of methane conversion decomposition frequently conflated, different Fe species still controversial. Herein, aluminosilicate CHA with at spatial distances affected by arrangement framework Al atoms were synthesized a one-pot manner presence or absence Na. The was identified 27Al 29Si MAS NMR spectra thermogravimetry-differential thermal analysis (TG-DTA) curves. Ultraviolet (UV)–vis, X-ray absorption spectroscopy (XAS), NO adsorption fourier transform infrared (FTIR) adopted to analyze speciation. higher proportion 6 MR Fe-CHA Na confirmed FTIR spectrum. proximal distant sites reactions including direct oxidation methanol, methanol hydrocarbon, compared temperatures provide corresponding active reaction pathways. distant, isolated proton more tandem hydrocarbon than proximal, paired protons, respectively. Additionally, afforded activity decomposition. These findings guide design highly oxidation, reactions, addressing energy environmental concerns.

Язык: Английский

Процитировано

6