Chemical Engineering Journal Advances, Journal Year: 2025, Volume and Issue: 22, P. 100745 - 100745
Published: April 8, 2025
Language: Английский
ACS Catalysis, Journal Year: 2022, Volume and Issue: 12(24), P. 14882 - 14901
Published: Nov. 23, 2022
Polyolefins, the largest used commodity plastics in world, find extensive application many fields. However, most end up landfills or incineration, leading to severe ecological crises, environmental pollution, and serious resource waste problems. As representatives on chemical upcycling of polyolefin fuels bulk/fine chemicals, catalytic cracking hydrocracking based zeolite metal/zeolite composite catalysts are considered effective paths due their large capacity strong adaptability existing petrochemical equipment. After an overview reaction mechanisms pyrolysis cracking, this review aims comprehensively discuss influence catalyst structure (acidity, pore structure, morphology) activity, selectivity, stability particularly emphasizing importance for matching acidity target product formation. Subsequently, structure–activity relationship between metal site zeolite's acid is also discussed. In end, emerging opportunities challenges proposed promote a more efficient way upcycling.
Language: Английский
Citations
111
Chemical Reviews, Journal Year: 2023, Volume and Issue: 123(9), P. 6107 - 6196
Published: March 30, 2023
The Brønsted acidity of proton-exchanged zeolites has historically led to the most impactful applications these materials in heterogeneous catalysis, mainly fields transformations hydrocarbons and oxygenates. Unravelling mechanisms at atomic scale been object tremendous efforts last decades. Such investigations have extended our fundamental knowledge about respective roles confinement catalytic properties proton exchanged zeolites. emerging concepts are general relevance crossroad catalysis molecular chemistry. In present review, emphasis is given views on mechanism generic catalyzed by acid sites zeolites, combining information gained from advanced kinetic analysis, situ, operando spectroscopies, quantum chemistry calculations. After reviewing current nature themselves, key parameters a focus made reactions undergone alkenes, alkanes, aromatic molecules, alcohols, polyhydroxy molecules. Elementary events C–C, C–H, C–O bond breaking formation core reactions. Outlooks take up future challenges field, aiming getting ever more accurate mechanisms, as ultimate goal, provide rational tools for design improved zeolite-based catalysts.
Language: Английский
Citations
85
Russian Chemical Reviews, Journal Year: 2023, Volume and Issue: 92(12), P. RCR5104 - RCR5104
Published: Dec. 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.
Language: Английский
Citations
39
Device, Journal Year: 2023, Volume and Issue: 1(5), P. 100173 - 100173
Published: Nov. 1, 2023
Language: Английский
Citations
29
Journal of Analytical and Applied Pyrolysis, Journal Year: 2024, Volume and Issue: 180, P. 106551 - 106551
Published: May 22, 2024
Language: Английский
Citations
13
Catalysis Science & Technology, Journal Year: 2024, Volume and Issue: 14(6), P. 1387 - 1427
Published: Jan. 1, 2024
Designing robust hybrid/bifunctional catalysts for CO 2 to DME is of increasing importance in energy and environmental science simultaneously address two important global challenges: carbon emission reduction alternative fuel development.
Language: Английский
Citations
9
Journal of Inorganic and Organometallic Polymers and Materials, Journal Year: 2025, Volume and Issue: unknown
Published: Jan. 13, 2025
Language: Английский
Citations
1
Nature Communications, Journal Year: 2023, Volume and Issue: 14(1)
Published: July 27, 2023
Unveiling catalytic mechanisms at a molecular level aids rational catalyst design and selectivity control for process optimization. In this study, we find that the Brønsted acid site density of zeolite efficiently controls guaiacol pyrolysis mechanism. Guaiacol demethylation to catechol initiates reaction, as evidenced by detected methyl radicals. The mechanism branches form either fulvenone (c-C5H4 = C O), reactive ketene intermediate, dehydration, or phenol acid-catalyzed dehydroxylation. At high density, formation is inhibited due surface coordination configuration its precursor, catechol. By quantifying intermediates products utilizing operando photoelectron photoion coincidence spectroscopy, evidence suppression responsible fivefold increase. Complementary reaction pathway calculations, along with 29Si NMR-MAS spectroscopy results corroborate proposed, flexible approach applicable broad variety heterogeneous reactions.
Language: Английский
Citations
20
Fuel, Journal Year: 2023, Volume and Issue: 349, P. 128703 - 128703
Published: May 20, 2023
Language: Английский
Citations
19
Accounts of Chemical Research, Journal Year: 2023, Volume and Issue: 56(14), P. 2001 - 2014
Published: July 4, 2023
ConspectusThe methanol-to-hydrocarbons (MTH) process has provided a new route to obtaining basic chemicals without relying on an oil resource. Acidity and shape selectivity endow the zeolite with decisive role in MTH catalysis. However, inherent reaction characteristics of over zeolites, such as complexity catalytic kinetics, diversity modes, even limitations diffusive decoupling, have all confused people respect comprehensive mechanistic understanding. By examining zeolite-catalyzed from perspective chemical bonding, one would realize that this reflects dynamic assembly C–C bonds C1 components multicarbon products. The key understanding lies mechanism by which are formed rearranged confined microenvironment channel or cage structures catalysts achieve shape-selective production.The applications advanced situ spectroscopy well computational chemistry provide tremendous opportunities for capturing identifying details structure properties reactants, intermediates, products space channels cages, observing real-time evolution surface, modeling elementary steps at molecular atomic levels.In Account, will be outlined based decades continuous research in-depth combination theoretical methods allowed us observe simulate formation, growth, aging working catalyst surface thus map dynamical active sites Brønsted acid site (BAS) organic–inorganic hybrid supramolecule (OIHS) reaction. Moreover, ever-evolving succession OIHS methoxy species (SMS) ion-pair complexes (AIPC) inert (IC) guided autocatalytic initiation sustaining then termination, resulting complex interlaced hypercycle network. concept catalysis deep insight into mechanisms structure–activity relationships chemistry. More importantly, we now getting closer nature beyond traditional view BAS
Language: Английский
Citations
19