Study on the Formaldehyde Oxidation Reaction of Acid-Treated Manganese Dioxide Nanorod Catalysts DOI Open Access
Yanqiu Li,

Yuan Su,

Yunfeng Yang

и другие.

Catalysts, Год журнала: 2022, Номер 12(12), С. 1667 - 1667

Опубликована: Дек. 18, 2022

Formaldehyde is an important downstream chemical of syngas. Furniture and household products synthesized from formaldehyde will slowly decompose release again during use, which seriously affects indoor air quality. In order to solve the pollution problem, this paper took catalytic oxidation as research object; prepared a series low-cost, acid-treated manganese dioxide nanorod catalysts; investigated effect acid-treatment conditions on catalysts’ activity. It was found that MnNR-0.3ac-6h catalyst with 0.3 mol/L sulfuric acid for 6 h had best The conversion rate reached 98% at 150 °C 90% 25 room temperature. During reaction time 144 h, about 90%, maintained high treatment could increase number oxygen vacancies surface catalysts promote production reactive species. amount species 13% higher than without treatment.

Язык: Английский

Manganese-catalyzed hydrogenation, dehydrogenation, and hydroelementation reactions DOI
Kuhali Das, Satyadeep Waiba, Akash Jana

и другие.

Chemical Society Reviews, Год журнала: 2022, Номер 51(11), С. 4386 - 4464

Опубликована: Янв. 1, 2022

The emerging field of organometallic catalysis has shifted towards research on Earth-abundant transition metals due to their ready availability, economic advantage, and novel properties. In this case, manganese, the third most abundant transition-metal in Earth's crust, emerged as one leading competitors. Accordingly, a large number molecularly-defined Mn-complexes been synthesized employed for hydrogenation, dehydrogenation, hydroelementation reactions. regard, catalyst design is based three pillars, namely, metal-ligand bifunctionality, ligand hemilability, redox activity. Indeed, developed catalysts not only differ chelating atoms they possess but also working principles, thereby different turnover numbers product molecules. Hence, critical assessment molecularly defined manganese terms atoms, reaction conditions, mechanistic pathway, significant. Herein, we analyze complexes catalytic activity, versatility allow multiple transformations routes convert substrates target This article will be helpful get significant insight into design, aiding design.

Язык: Английский

Процитировано

163

Research Status, Challenges, and Future Prospects of Carbon Dioxide Reduction Technology DOI
Hongtao Dang, Bin Guan, Junyan Chen

и другие.

Energy & Fuels, Год журнала: 2024, Номер 38(6), С. 4836 - 4880

Опубликована: Март 12, 2024

The survival and sustainable development of humanity are gravely threatened by climate change, which has recently been elevated to the status one greatest threats humanity's security on a worldwide scale. In response global how obtain renewable clean fuels is an important challenge for human society. order reach carbon peak attain neutrality, using CO2 as resource become crucial aim civilization. Converting into chemical products with higher added value, that is, utilization technology can not only achieve emission reduction but also have certain economic benefits. technologies primarily include photocatalytic reduction, electrocatalytic thermal catalytic relay catalysis. This paper mainly summarizes mechanism conversion research related catalysts, discusses prospects system (catalyst modification, product selectivity improvement, etc.). ideas guidance provided efficient stable catalysts application in areas environment energy.

Язык: Английский

Процитировано

19

Alcohol-Assisted Hydrogenation of Carbon Monoxide to Methanol Using Molecular Manganese Catalysts DOI Creative Commons
Akash Kaithal, Christophe Werlé, Walter Leitner

и другие.

JACS Au, Год журнала: 2021, Номер 1(2), С. 130 - 136

Опубликована: Янв. 25, 2021

Alcohol-assisted hydrogenation of carbon monoxide (CO) to methanol was achieved using homogeneous molecular complexes. The manganese complex [Mn(CO)2Br[HN(C2H4P i Pr2)2]] ([HN(C2H4P Pr2)2] = MACHO- Pr) revealed the best performance, reaching up turnover number 4023 and frequency 857 h-1 in EtOH/toluene as solvent under optimized conditions (T 150 °C, p(CO/H2) 5/50 bar, t 8-12 h). Control experiments affirmed that reaction proceeds via formate ester intermediate, whereby a catalytic amount base found be sufficient mediate its formation from CO alcohol situ. Selectivity for reached >99% with no accumulation ester. demonstrated work component, resulting reactive system allows "breeding" without any coreagents.

Язык: Английский

Процитировано

39

Base Metal‐Catalyzed C‐Methylation Reactions Using Methanol DOI
Naina Sarki, Vishakha Goyal, Kishore Natte

и другие.

Advanced Synthesis & Catalysis, Год журнала: 2021, Номер 363(22), С. 5028 - 5046

Опубликована: Сен. 22, 2021

Abstract C‐methylation is a vitally important reaction applicable in chemical synthesis and structure‐based drug design. Notably, the “magic methyl” effect has become decisive medicinal chemistry discovery for modulation of bio‐active properties life science molecules. In this regard, widely applied modification various biomolecules, pharmaceuticals, natural products. general, often relies on activated, hazardous uneconomical methyl sources such as diazomethane, dimethyl sulfate, halides. To achieve methylation reactions sustainable cost‐effective manner, use ‘ideal’ C1 source crucial. methanol constitutes an expedient −CH 3 because simple alcohol less‐hazardous, inexpensive, abundantly available platform well it produces only water by‐product processes. Regarding potential catalysts to perform using by hydrogen borrowing methodology, non‐noble metal‐based are highly preferable due their unique advantages more abundance, inexpensive low‐toxicity. recent years, chemists made significant contributions towards catalytic valorization insert groups via C−H activation variety compounds Consequently, minireview we summarize process applying Fe‐, Mn‐, Co‐ Ni‐based metal free catalysts. magnified image

Язык: Английский

Процитировано

37

Manganese-Catalyzed Reformation of Vicinal Glycols to α-Hydroxy Carboxylic Acids with the Liberation of Hydrogen Gas DOI
Satyadeep Waiba,

Mamata Maiti,

Biplab Maji

и другие.

ACS Catalysis, Год журнала: 2022, Номер 12(7), С. 3995 - 4001

Опубликована: Март 15, 2022

Conversion of readily available feedstocks to valuable platform chemicals via an eco-friendly catalytic pathway has always been one the key focuses synthetic chemists. In this context, herein, we report selective transformation feedstock, vicinal glycols, value-added α-hydroxycarboxylic acid molecules that are prevalent in bioactive and biodegradable polymers. A bench stable Earth-abundant metal complex, {[HN(C2H4PPh2)2]Mn(CO)2Br}, Mn-I catalyzed reformation reaction at low temperature high selectivity with a turnover number reaching 2400, surpassing previously used homogeneous catalysts for such reaction. Hydrogen gas is evolved as byproduct without needing acceptor. The developed protocol applicable both aromatic aliphatic delivering α-substituted hydroxycarboxylic acids yields selectivities. Detailed mechanistic studies elucidated involvements different manganese(I)-species during acceptorless dehydrogenation catalysis.

Язык: Английский

Процитировано

26

Carbon Monoxide as C1 Building Block in Fine Chemical Synthesis DOI Open Access
Rui M. B. Carrilho, Mário J. F. Calvete,

Gábor Mikle

и другие.

Chinese Journal of Chemistry, Год журнала: 2023, Номер 42(2), С. 199 - 221

Опубликована: Сен. 20, 2023

Comprehensive Summary Carbon monoxide (CO) has become one of the most relevant and versatile renewable C1 building blocks for chemical synthesis, especially in fine chemicals industry, due to development efficient selective catalysts its activation. In this review, we present a comprehensive critical analysis last 10 years literature on use CO as feedstock production. The review is organized by type catalytic reaction, namely alkene alkyne carbonylation, hydroformylation, carbonylation aryl halides, carbonylative cross‐coupling C—H carbonylation. Notable examples synthesis and/or known pharmaceuticals are highlighted. Emphasis placed utilizing block or more steps. catalyst used reaction conditions consistently presented throughout all examples.

Язык: Английский

Процитировано

17

Hydrogenation of CO2 to Methanol with Mn‐PNP‐Pincer Complexes in the Presence of Lewis Acids: the Formate Resting State Unleashed DOI Creative Commons

David A. Kuß,

Markus Hölscher, Walter Leitner

и другие.

ChemCatChem, Год журнала: 2021, Номер 13(14), С. 3319 - 3323

Опубликована: Май 7, 2021

Abstract The hydrogenation of CO 2 to methanol was achieved using a catalytic system comprising metal complexes the form [Mn(CO) [N(C H 4 PR )] (R= i Pr/Ph, [HN(C PPh ) ]=MACHO−Ph) together with Lewis acid additives. Mechanistic studies suggest initial insertion into Mn−H bond leads formate complex as resting state. By systematically balancing interaction between acidic additive and catalyst, ligand could be removed through esterification unleash full potential. reaction conditions were optimized on basis partial order relevant compounds. combination MACHO−Ph Ti(O Pr) identified most active TON 160 ( p (CO )=5 bar, (H )=160 T =150 °C). Using solvent co‐reagent allows conversion /H in liquid phase process only substrates products.

Язык: Английский

Процитировано

31

Fast pyrolysis of agricultural residues: Reaction mechanisms and effects of feedstock properties and microwave operating conditions on the yield and product composition DOI Creative Commons

Ana Karen Silos-Llamas,

Hanifrahmawan Sudibyo, Virginia Hernández‐Montoya

и другие.

Journal of Analytical and Applied Pyrolysis, Год журнала: 2023, Номер 175, С. 106217 - 106217

Опубликована: Окт. 1, 2023

Fundamental understanding of the pyrolysis process plays an indispensable role in valorization wastes and development novel sustainable technologies. This study introduces a approach by investigating reaction mechanisms involve Microwave-Assisted Fast Pyrolysis (MAFP) to unveil thermal decomposition agricultural residues: pecan nutshell (NS), sugarcane bagasse (SB), orange seed (OS) biomasses. The holistic for these biomasses was analyzed based on final chemical compositions yields bio-oil, biochar biogas correlated microwave processing conditions feedstock's composition. findings revealed that bio-oil is enhanced at moderated energy (<5 GJ/t) as result endothermic reactions such heterolytic fragmentation, Maccoll elimination, Friedel-Craft acylation, Piancatelli rearrangement methoxylation. maximum yield protein-rich biomass due selective heating (Paal-Knorr pyrrole synthesis, Baeyer-Villiger oxidation, Maillard reaction, ring conversion γ-butyrolactone). formation attributed repolymerization aromatic aldehydes, hydrocarbons, amines, ethers, well dehydroxymethylation dealkylation processes. provides comprehensive several using pyrolysis, establish bases effective waste management.

Язык: Английский

Процитировано

12

Biofuel Recovery from Plantain and Banana Plant Wastes: Integration of Biochemical and Thermochemical Approach DOI Creative Commons
Abdulmoseen Segun Giwa, Mingqiang Sheng, Ndungutse Jean Maurice

и другие.

JOURNAL OF RENEWABLE MATERIALS, Год журнала: 2023, Номер 11(6), С. 2593 - 2629

Опубликована: Янв. 1, 2023

Globally, fossil fuel dependence has created several environmental challenges and climate change. Hence, creating other alternative renewable ecologically friendly bio-energy sources is necessary. Lignocellulosic biomass gained significant attention recently as a material for biofuel production. The large amounts of plantain banana plant parts wasted after harvesting, well the peels generated daily by fruit market industries, demonstrate potential bioenergy resources. This review briefly assesses (PBB) in developing, developed, underdeveloped countries, consumable parts, feasible products yield. It emphasized advantages disadvantages commonly adopted treatment technologies composting, incineration, landfilling. Further, utilization PBB catalysts biodiesel synthesis was highlighted. To optimize recovery biofuel, different integration routes pyrolysis, anaerobic digestion, fermentation, hydrothermal carbonization, liquefaction, gasification valorization were proposed. complex compounds present (hemicellulose, cellulose, lignin) can be converted into valuable bio-products such methane gas bio-ethanol bioenergy, nutrients to promote bioactive ingredients. investigation viability innovation integrated routes' technology necessary improve circular bio-economy biofuels from waste, particularly PBB.

Язык: Английский

Процитировано

10

The Backbone of Success of P,N-Hybrid Ligands: Some Recent Developments DOI Creative Commons
Martin B. Smith

Molecules, Год журнала: 2022, Номер 27(19), С. 6293 - 6293

Опубликована: Сен. 23, 2022

Organophosphorus ligands are an invaluable family of compounds that continue to underpin important roles in disciplines such as coordination chemistry and catalysis. Their success can routinely be traced back facile tuneability thus enabling a high degree control over, for example, electronic steric properties. Diphosphines, phosphorus bearing two separated PIII donor atoms, also highly valued impart their own unique features, example excellent chelating properties upon metal complexation. In many classical this type, the backbone connectivity has been based on all carbon spacers only but there is growing interest embedding other atoms additional nitrogen (–NH–, –NR–) sites. This review will collate some examples field, illustrate role highlight reactivities applications. It shown incorporation nitrogen-based group unusual catalytic

Язык: Английский

Процитировано

16