Tag: M.W=100-150

Gao, Guoming; Shao, Yuewen; Gao, Yong; Wei, Tao; Gao, Guanggang; Zhang, Shu; Wang, Yi; Chen, Qifeng; Hu, Xun published the artcile< Synergetic effects of hydrogenation and acidic sites in phosphorus-modified nickel catalysts for the selective conversion of furfural to cyclopentanone>, Recommanded Product: (Tetrahydrofuran-2-yl)methanol, the main research area is synergetic hydrogenation acidic phosphorus nickel catalyst furfural cyclopentanone.

Cyclopentanone (CPO) is a value-added chem. that can be produced from furfural via hydrogenation coupled with an acid-catalysis step. Developing an effective bi-functional catalyst remains a challenge to be overcome. In this study, phosphorus was introduced to Ni/Al2O3 to modify the distribution of acidic sites and to tailor the activity of the metal sites for hydrogenation, with the aim of developing an active and cost-effective transition-metal-based catalyst for the conversion of furfural to CPO. The results showed that phosphorus species could react with both alumina and metallic nickel, forming an AlPO4 phase and nickel phosphide species. The formation of the AlPO4 phase reduced the specific area of the catalyst and increased the abundance of acidic sites. The formation of nickel phosphide species (Ni2P, Ni3P, and Ni12P5) tailored the selectivity of the hydrogenation sites. Furfural was only hydrogenated to furfuryl alc. (FA), while further hydrogenation to tetrahydrofurfuryl alc. (TFA) was inhibited. The introduced acidic sites further catalyzed the conversion of the formed FA to CPO. The balanced distribution of the hydrogenation sites and the acidic sites, as well as their tailored activity for hydrogenation and acid-catalyzed reactions, was crucial for the selective conversion of furfural to CPO.

Catalysis Science & Technology published new progress about Acid catalysis. 97-99-4 belongs to class tetrahydrofurans, and the molecular formula is C5H10O2, Recommanded Product: (Tetrahydrofuran-2-yl)methanol.

Referemce:
Tetrahydrofuran – Wikipedia,
Tetrahydrofuran | (CH2)3CH2O – PubChem

Wang, Chunhua; Wang, Anjie; Yu, Zhiquan; Wang, Yao; Sun, Zhichao; Kogan, Victor M.; Liu, Ying-Ya published the artcile< Aqueous phase hydrogenation of furfural to tetrahydrofurfuryl alcohol over Pd/UiO-66>, Quality Control of 97-99-4, the main research area is hydrogenation furfural tetrahydrofurfuryl palladium catalyst.

A Pd/UiO-66 catalyst was synthesized with well-dispersed Pd nanoparticles. The obtained catalyst was tested in the hydrogenation of furfural to tetrahydrofurfuryl alc. in various solvents, Water was the most suitable solvent. Pd/UiO-66 exhibited much higher activity than Pd/SiO2 and Pd/γ-Al2O3, completely converting furfural to tetrahydrofurfuryl alc. with 100% selectivity under mild conditions. The hydrogenation of C=O moiety in tetrahydrofurfural was rate-determining step. Static adsorption measurement indicated that the adsorption of furfural on UiO-66 was significantly stronger than that on SiO2 or γ-Al2O3, suggesting that the adsorption play an important role in the gas-liquid-solid furfural hydrogenation reaction.

Catalysis Communications published new progress about Catalyst supports. 97-99-4 belongs to class tetrahydrofurans, and the molecular formula is C5H10O2, Quality Control of 97-99-4.

Referemce:
Tetrahydrofuran – Wikipedia,
Tetrahydrofuran | (CH2)3CH2O – PubChem

Cao, Peng; Lin, Lu; Qi, Haifeng; Chen, Rui; Wu, Zhijie; Li, Ning; Zhang, Tao; Luo, Wenhao published the artcile< Zeolite-Encapsulated Cu Nanoparticles for the Selective Hydrogenation of Furfural to Furfuryl Alcohol>, Electric Literature of 97-99-4, the main research area is zeolite encapsulated copper nanoparticle hydrogenation furfural furfuryl alc.

Catalytic hydrogenation of furfural (FFL) to furfuryl alc. (FAL) is one of the pivotal reactions for biomass valorization. Herein, well-defined Cu nanoparticles of ~1.8 nm encapsulated within titanium silicalite-1 (TS-1) have been successfully prepared by an in situ encapsulation approach, which possesses significant advantages in metal dispersion and uniformity compared to the traditional wet impregnation method. After a Na ion-exchange process for modulation of the zeolite microenvironment, the obtained Na-Cu@TS-1 catalyst affords an enhanced activity and selectivity in the selective hydrogenation of FFL into FAL, with a FFL conversion of 93.0% and a FAL selectivity of 98.1% at 110°C, 10 bar H2, after a reaction time of 2 h. A turnover frequency value of 55.2 h-1 has been achieved, reflecting some of the highest activity for Cu-based heterogeneous catalysts under similar conditions. Comprehensive characterization studies reveal that the confined environment of the zeolite could not only provide the spatial restriction for metal particles but also induce an electronic interaction between encapsulated Cu nanoparticles and Ti species in Na-Cu@TS-1, which both lead to effective suppression of the metal aggregation and leaching during catalysis. Na species, added by the ion exchange, not only mediate the acid/basic property of the zeolite for suppressing the side reactions but also modulate the encapsulated Cu species into an electronic-rich state, facilitating the FFL hydrogenation. Deactivation of Na-Cu@TS-1 is primarily caused by Na leaching into the liquid phase, but activity can be almost restored after a Na readdn. process.

ACS Catalysis published new progress about Adsorption. 97-99-4 belongs to class tetrahydrofurans, and the molecular formula is C5H10O2, Electric Literature of 97-99-4.

Referemce:
Tetrahydrofuran – Wikipedia,
Tetrahydrofuran | (CH2)3CH2O – PubChem

Liu, Qiaoyun; Qiao, Botao; Liu, Fei; Zhang, Leilei; Su, Yang; Wang, Aiqin; Zhang, Tao published the artcile< Catalytic production of 1,4-pentanediol from furfural in a fixed-bed system under mild conditions>, Category: tetrahydrofurans, the main research area is catalytic pentanediol furfural fixed bed system.

Furfural is one of the most important biomass-derived chems. Its large-scale availability calls for the exploration of new transformation methods for further valorization. Here we report on the direct, one-step conversion of furfural into 1,4-pentanediols (1,4-PeDs) using a combination of Amberlyst-15 and Ru-FeOx/AC catalysts. It is interesting to find that the introduction of a suitable amount of FeOx results in a great improvement in the dispersion of Ru and a decrease in the Lewis acidity. Both XPS and H2-TPR show that there is electron transfer from Ru to Fe, and the electronic interaction facilitates the reduction of both Ru and Fe species. When used in combination with Amberlyst-15, the Ru-6.3FeOx/AC catalyst afforded the best performance with a 1,4-PeD yield of 86%; by contrast, Ru/AC free of FeOx only gave levulinic acid as the major product, demonstrating the key role of the acid/metal balance in the one-pot conversion of furfural to 1,4-PeD. Moreover, such a dual catalyst exhibited excellent durability within 175 h time-onstream.

Green Chemistry published new progress about Biomass. 97-99-4 belongs to class tetrahydrofurans, and the molecular formula is C5H10O2, Category: tetrahydrofurans.

Referemce:
Tetrahydrofuran – Wikipedia,
Tetrahydrofuran | (CH2)3CH2O – PubChem

Kumar, Abhinav; Srivastava, Rajendra published the artcile< Pd-Decorated Magnetic Spinels for Selective Catalytic Reduction of Furfural: Interplay of a Framework-Substituted Transition Metal and Solvent in Selective Reduction>, Related Products of 97-99-4, the main research area is selective reduction furfural palladium magnetic spinel.

The reduction of functional platform chems., such as furfural, to industrially important chems. and fuel requires precise modulation of surface reactivity of the catalyst to obtain the desired reactivity and selectivity. In this study, the selective reduction of furfural (FAL) to furfuryl alc. (FOL) and tetrahydrofurfuryl alc. (THFA) is achieved by the transition metal interplay in the framework structure of magnetic spinels Fe3O4 and by modulating the reaction medium. Herein, FAL is selectively and quant. reduced to FOL in water at very mild reaction conditions over Pd-decorated CuFe2O4, whereas FAL is selectively converted to THFA in hexane at mild reaction conditions over Pd-decorated NiFe2O4, using H2 as an economical reducing agent. The Pd loading, reaction temperature, H2 pressure, and reaction time are minimized to obtain the best selectivity toward THFA. Different modes of FAL adsorption occur on CuFe2O4 and NiFe2O4 surfaces. Dissociative adsorption of H2 occurs on Pd sites to form Pd-H species, followed by transfer hydrogenation from Pd-H to FAL adsorbed on spinels, leading to the formation of FOL or THFA. Efficient magnetic recyclability and the hot filtration test show that the catalyst exhibits no significant loss in the activity even after five recycles. Catalysts exhibit very high activity, selectivity, and low activation energy, which are very attractive for academic and industrial points of view.

ACS Applied Energy Materials published new progress about Activation energy. 97-99-4 belongs to class tetrahydrofurans, and the molecular formula is C5H10O2, Related Products of 97-99-4.

Referemce:
Tetrahydrofuran – Wikipedia,
Tetrahydrofuran | (CH2)3CH2O – PubChem

Mironenko, Roman M.; Belskaya, Olga B.; Talsi, Valentin P.; Likholobov, Vladimir A. published the artcile< Mechanism of Pd/C-catalyzed hydrogenation of furfural under hydrothermal conditions>, Reference of 97-99-4, the main research area is palladium carbon nanotube catalyst hydrothermal condition furfural hydrogenation mechanism.

Catalytic hydrogenation of furfural under hydrothermal conditions is of great importance and has recently attracted huge attention as an approach to obtaining a wide range of valuable chems. from a renewable source. However, the data concerning the reaction mechanism of aqueous-phase furfural hydrogenation are very scarce, and it is still not clear which reactions lead to various carbonyl compounds, such as cyclopentanone, 4-oxopentanal, 5-hydroxy-2-pentanone. Herein, we present the results of an exptl. study of the mechanism of reactions occurring in the furfural hydrogenation under hydrothermal conditions over the 1% Pd/CNTs catalyst. The following approaches have been used to study the reaction mechanism: hydrogenation of key intermediates formed upon the furfural conversion, and isotopic labeling experiments using D2O as a tracer in hydrogenation of furfural, which provides direct evidence of the occurring reactions. It was found that the furfural hydrogenation process is realized through four pathways including various reductive and acid-catalyzed furan ring opening reactions. The methods and approaches used in the present work, as well as the results obtained, can be useful in studying the mechanism of aqueous-phase hydrogenation of a wide range of oxygen-containing substrates in the presence of catalysts of different compositions

Journal of Catalysis published new progress about Carbon nanotubes (catalyst support). 97-99-4 belongs to class tetrahydrofurans, and the molecular formula is C5H10O2, Reference of 97-99-4.

Referemce:
Tetrahydrofuran – Wikipedia,
Tetrahydrofuran | (CH2)3CH2O – PubChem

Burke, Patrick M.; Reynolds, William F.; Tam, Janet C. L.; Yates, Peter published the artcile< The assignment of proton and carbon-13 chemical shifts for dihydro-3(2H)-furanone derivatives by means of specific deuterium labeling experiments and 13C{1H} decoupling experiments>, Product Details of C8H14O2, the main research area is PMR hydrotetramethylfuranone; furanone dihydrotetramethyl carbon NMR; ring cleavage methyldihydrofuranone acid.

The PMR of I(R=Me,R2=H)(II) in 80% H2SO4 shows a time-dependent decrease in the intensity of the lower-field gem-di-Me signal relative to the upper-field gem-di-Me signal. Due to the reversible opening of II to 2-hydroxy-2,5-dimethyl-4-hexen-3-one which results in D exchange at the C-5 Me groups of II. The lower-field gem-di-Me signal of II in this medium is therefore assigned to these Me groups. A similar relation between the Me proton signals of II in organic solvents is demonstrated by synthesis of I(R=CD3, R1=D), comparison of the PMR and its 2,2- and 5,5-di-Me analogs. and observation of long range coupling in the spectrum of II. Assignment of 13C chem. shifts for II are made based on proton-coupled spectra, showing that the signal of the C-5 Me carbons appears at ∼4 ppm towards lower field than that of the C-2 Me carbons. Both the 1H and 13C chem. shift assignments for II are confirmed from 13C{1H} spectra using low power single frequency 1H decoupling.

Canadian Journal of Chemistry published new progress about Exchange reaction. 5455-94-7 belongs to class tetrahydrofurans, and the molecular formula is C8H14O2, Product Details of C8H14O2.

Referemce:
Tetrahydrofuran – Wikipedia,
Tetrahydrofuran | (CH2)3CH2O – PubChem

Papadopoulos, Giorgos N.; Kokotou, Maroula G.; Spiliopoulou, Nikoleta; Nikitas, Nikolaos F.; Voutyritsa, Errika; Tzaras, Dimitrios I.; Kaplaneris, Nikolaos; Kokotos, Christoforos G. published the artcile< Phenylglyoxylic Acid: An Efficient Initiator for the Photochemical Hydrogen Atom Transfer C-H Functionalization of Heterocycles>, Reference of 97-99-4, the main research area is heterocycle green preparation phenylglyoxylic acid catalyst hydrogen atom transfer; C−H activation; hydrogen atom transfer; metal-free processes; phenylglyoxylic acid; photochemistry.

A cheap and efficient photochem. method was developed for the C-H functionalization of heterocycles was studied. Phenylglyoxylic acid (PhCOCOOH) would behave as an alternative to metal-based catalysts and organic dyes and provided a very general and wide array of photochem. C-H alkylation, alkenylation, and alkynylation, as well as C-N bond forming reaction methodologies. This novel, mild, and metal-free protocol was successfully employed in the functionalization of a wide range of C-H bonds, utilized not only O- or N-heterocycles, but also the less studied S-heterocycles.

ChemSusChem published new progress about C-H bond activation. 97-99-4 belongs to class tetrahydrofurans, and the molecular formula is C5H10O2, Reference of 97-99-4.

Referemce:
Tetrahydrofuran – Wikipedia,
Tetrahydrofuran | (CH2)3CH2O – PubChem

Tian, Hongli; Gao, Guoming; Xu, Qing; Gao, Zhiran; Zhang, Shu; Hu, Guangzhi; Xu, Leilei; Hu, Xun published the artcile< Facilitating selective conversion of furfural to cyclopentanone via reducing availability of metallic nickel sites>, SDS of cas: 97-99-4, the main research area is furfural cyclopentanone hydrogenation nickel catalyst.

Conversion of the biomass-derived furfural to cyclopentanone (CPO) involves multiple hydrogenation steps, in which not only the type but also the abundance of metallic sites might impact fates of the reaction intermediates and consequently selectivity of the products. In this study, we found that, during the hydrogenation, the carbonyl and the furan ring functionalities in furfural showed the different response to the number of nickel sites on Ni/SiO2 catalyst. The hydrogenation of the C = O in furfural could take place effectively with the nickel loading below 1 wt% to form firstly furfuryl alc. (FA) and then to CPO with the selectivity as high as 98.2%. In comparison, the higher nickel loading favored the hydrogenation of the furan ring in furfural or FA to form tetrahydrofurfuryl alc. (THFA), formation of which eliminated the chance for the formation of CPO. The hydrogenation of the carbonyl functionality and furan ring in furfural proceeded via distinct orientations of adsorption and the involvement of the varied number of metal sites. Controlling the number of exposed metallic nickel sites could thus tailor the selectivity of the products in hydrogenation of furfural.

Molecular Catalysis published new progress about Agglomeration. 97-99-4 belongs to class tetrahydrofurans, and the molecular formula is C5H10O2, SDS of cas: 97-99-4.

Referemce:
Tetrahydrofuran – Wikipedia,
Tetrahydrofuran | (CH2)3CH2O – PubChem

Liu, Qianhe; Liu, Qing; Hu, Xun published the artcile< Selective conversion of furfural into value-added chemical commodity in successive fixed-bed reactors>, COA of Formula: C5H10O2, the main research area is furfural commodity successive fixed bed reactor.

Successive hydrogenation of furfural in two fixed-bed reactors connected in tandem with Cu/SiO2 and Ni/SiO2 as the catalysts was achieved under atm. pressure. Various targeting products including furfuryl alc. (yield: 98.8%), 2-methylfuran (yield: 95.1%), 2-methyltetrahydrofuran (yield: 96.2%) and tetrahydrofurfuryl alc. (yield: 78.2%) could be obtained by variation of the reactor configurations.

Catalysis Communications published new progress about Fixed-bed catalytic reactors. 97-99-4 belongs to class tetrahydrofurans, and the molecular formula is C5H10O2, COA of Formula: C5H10O2.

Referemce:
Tetrahydrofuran – Wikipedia,
Tetrahydrofuran | (CH2)3CH2O – PubChem