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Artículos de revistas sobre el tema "Bifunctional solid acids"

Autor: Grafiati
Publicado: 10 de marzo de 2023

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1

Iglesia, E. "Bifunctional pathways in catalysis by solid acids and bases." Catalysis Today 38, no. 3 (1997): 339–60. http://dx.doi.org/10.1016/s0920-5861(97)81503-7.

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2

Rudlof, Jens, Beate Neumann, Hans-Georg Stammler, and Norbert W. Mitzel. "Synthesis of a bifunctional boron-Lewis acid and studies on host-guest chemistry using pyridine and TMPD." Zeitschrift für Naturforschung B 77, no. 2-3 (2021): 141–48. http://dx.doi.org/10.1515/znb-2021-0175.

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Abstract Based on the previously described bifunctional Lewis acid with a functional distance of the boron functions of 4.918(2) Å, the development of a further bifunctional, boron-containing Lewis acid with a wider functional distance is demonstrated. Again, a stannylated precursor was used and the Lewis-acidic boron functions were introduced by means of tin-boron exchange. The general suitability of this class of compounds for the formation of host-guest-complexes is demonstrated by NMR experiments and by solid-state structures using pyridine and TMPD (N 1,N 1,N 4,N 4-tetramethylbenzene-1,4-
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3

Nishida, Haruo, Hiroshi Morikawa, Takeshi Endo, Takeshi Nakahara, Takayuki Ogata, and Koshi Kusumoto. "Solid state reaction of bifunctional bicyclo orthoesters and carboxylic acids and their metal adhesive properties." Polymer 47, no. 5 (2006): 1496–504. http://dx.doi.org/10.1016/j.polymer.2006.01.031.

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4

Gromov, Nikolay V., Tatiana B. Medvedeva, Ivan A. Lukoyanov, et al. "Formic Acid Production via One-Pot Hydrolysis-Oxidation of Starch over Quaternary Ammonium Salts of Vanadium-Containing Keggin-Type Heteropoly Acids." Catalysts 12, no. 10 (2022): 1252. http://dx.doi.org/10.3390/catal12101252.

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Bifunctional solid acidic quaternary ammonium salts of Keggin-type vanadium-containing heteropoly acids, such as R3.5H0.5PVMo11O40 (R: (C2H5)4N, (C4H9)4N, (C6H13)4N), and [(C4H9)4N]4.5H0.5SiW11VO40, are capable of one-pot hydrolysis-oxidationconversion (OxFA-processing) of starch to biogenic formic acid. The impact of the reaction conditions and catalyst type was revealed. The highest formic acid yield of 50% was achieved over the best [(C2H5)4N]3.5H0.5PVMo11O40 catalyst, which was active and stable in seven reaction cycles. The kinetic computational model, which described formic acid formatio
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5

Watanabe, Ryu-ichi, Tetsuo Suzuki, and Toshio Okuhara. "Skeletal isomerization of alkanes and hydroisomerization of benzene over solid strong acids and their bifunctional catalysts." Catalysis Today 66, no. 1 (2001): 123–30. http://dx.doi.org/10.1016/s0920-5861(00)00612-x.

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6

Tyufekchiev, Maksim, Jordan Finzel, Ziyang Zhang, et al. "A New Method for Solid Acid Catalyst Evaluation for Cellulose Hydrolysis." Sustainable Chemistry 2, no. 4 (2021): 645–69. http://dx.doi.org/10.3390/suschem2040036.

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A systematic and structure-agnostic method for identifying heterogeneous activity of solid acids for catalyzing cellulose hydrolysis is presented. The basis of the method is preparation of a supernatant liquid by exposing the solid acid to reaction conditions and subsequent use of the supernatant liquid as a cellulose hydrolysis catalyst to determine the effects of in situ generated homogeneous acid species. The method was applied to representative solid acid catalysts, including polymer-based, carbonaceous, inorganic, and bifunctional materials. In all cases, supernatant liquids produced from
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7

El Fergani, Magdi, Natalia Candu, Iunia Podolean, et al. "Catalytic Hydrotreatment of Humins Waste over Bifunctional Pd-Based Zeolite Catalysts." Catalysts 12, no. 10 (2022): 1202. http://dx.doi.org/10.3390/catal12101202.

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The catalytic hydrotreatment of humins, the solid byproduct produced from the conversion of C6 sugars (glucose, fructose) to 5-hydroxymethylfurfural (HMF), using supported Pd@zeolite (Beta, Y, and USY) catalysts with different amounts of Pd (i.e., 0.5, 1.0 and 1.5 wt%) was investigated under molecular hydrogen pressure. The highest conversion of humins (52.0%) was obtained on 1.5Pd@USY catalyst while the highest amount of humins oil (27.3%) was obtained in the presence of the 1Pd@Beta zeolite sample, at PH2 = 30 bars and T = 250 °C. The major compounds in the humins oil evidenced by GC-MS are
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8

Kingsbury, Christopher J., Marc Kielmann, Brendan Twamley, and Mathias O. Senge. "Self-Organization of Porphyrin–POM Dyads: Nonplanar Diacids and Oxoanions in Low-Dimensional H-Bonding Networks." Molecules 27, no. 20 (2022): 7060. http://dx.doi.org/10.3390/molecules27207060.

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Coordinating the spatial arrangement of electroactive partners is crucial to designable molecular electronics and photonics. Porphyrins are ubiquitous reaction centers in nature; synthetic porphyrins, in the crystallographic solid state, are often coerced into monolithic stacks, inhibiting reactivity. Using the principles of self-organization, and by exploiting charge-balance principles, we can manipulate nonplanar porphyrins into one- and two-dimensional hydrogen-bonded polymers, with polyoxometalate (POM) and bifunctional counter-anions serving as linkers. Herein, we report 11 crystal struct
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9

Elias, Samya, Ademola M. Rabiu, Benjamin I. Okeleye, Vincent Okudoh, and Oluwaseun Oyekola. "Bifunctional Heterogeneous Catalyst for Biodiesel Production from Waste Vegetable Oil." Applied Sciences 10, no. 9 (2020): 3153. http://dx.doi.org/10.3390/app10093153.

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Bifunctional solid catalysts facilitate the esterification of free fatty acids (FFA) into alkyl esters alongside the transesterification reaction, which allows for the use of waste vegetable oils with high water and FFA contents for biodiesel production. This makes the process economically viable and greener, as the waste fats and oils are readily available. The concurrent esterification and transesterification of waste palm oil (WPO) and waste sunflower oil (WSO) with methanol was investigated in the presence of calcium oxide on alumina catalyst in a conventional batch process. The catalyst c
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10

Yang, Qiang, and Xuejun Pan. "Synthesis and Application of Bifunctional Porous Polymers Bearing Chloride and Sulfonic Acid as Cellulase-Mimetic Solid Acids for Cellulose Hydrolysis." BioEnergy Research 9, no. 2 (2016): 578–86. http://dx.doi.org/10.1007/s12155-015-9702-2.

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11

Echizen, Tsuneo, Tetsuo Suzuki, Yuichi Kamiya, and Toshio Okuhara. "Mechanistic study on skeletal isomerization of n-butane using 1,4-13C2-n-butane on typical solid acids and their Pt-promoted bifunctional catalysts." Journal of Molecular Catalysis A: Chemical 209, no. 1-2 (2004): 145–53. http://dx.doi.org/10.1016/j.molcata.2003.08.021.

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12

Sekine, Mitsuo, and Tsujiaki Hata. "Chemical Synthesis of Oligonucleotides by Use of Phenylthio Group." Current Organic Chemistry 3, no. 1 (1999): 25–66. http://dx.doi.org/10.2174/1385272803666220130205329.

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This review deals with recent studies of oligonucleotide synthesis using the phenylthio group as the phosphate protecting group. Several fundament! properties of the P-S bond in phosphorothioate compounds are described in detail. The chemical synthesis and properties of nucleoside phosphorothioate derivatives, which can be prepared via silyl phosphite intermediates, are described. Several interesting and unique properties of a new useful phosphorylating reagent, S, S-diphenyl phosphorodithioate (PSS) are described with some examples involving an application to oligodeoxyribonucleotide synthesi
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13

Viollier, P. H., K. T. Nguyen, W. Minas, M. Folcher, G. E. Dale, and C. J. Thompson. "Roles of Aconitase in Growth, Metabolism, and Morphological Differentiation of Streptomyces coelicolor." Journal of Bacteriology 183, no. 10 (2001): 3193–203. http://dx.doi.org/10.1128/jb.183.10.3193-3203.2001.

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ABSTRACT The studies of aconitase presented here, along with those of citrate synthase (P. H. Viollier, W. Minas, G. E. Dale, M. Folcher, and C. J. Thompson, J. Bacteriol. 183:3184–3192, 2001), were undertaken to investigate the role of the tricarboxylic acid (TCA) cycle in Streptomyces coelicolor development. A single aconitase activity (AcoA) was detected in protein extracts of cultures during column purification. The deduced amino acid sequence of the cloned acoA gene constituted the N-terminal sequence of semipurified AcoA and was homologous to bacterial A-type aconitases and bifunctional
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14

Miranda, Luis F. C., Rogéria R. Gonçalves, and Maria E. C. Queiroz. "A Dual Ligand Sol–Gel Organic-Silica Hybrid Monolithic Capillary for In-Tube SPME-MS/MS to Determine Amino Acids in Plasma Samples." Molecules 24, no. 9 (2019): 1658. http://dx.doi.org/10.3390/molecules24091658.

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This work describes the direct coupling of the in-tube solid-phase microextraction (in-tube SPME) technique to a tandem mass spectrometry system (MS/MS) to determine amino acids (AA) and neurotransmitters (NT) (alanine, serine, isoleucine, leucine, aspartic acid, glutamic acid, lysine, methionine, tyrosine, and tryptophan) in plasma samples from schizophrenic patients. An innovative organic-silica hybrid monolithic capillary with bifunctional groups (amino and cyano) was developed and evaluated as an extraction device for in-tube SPME. The morphological and structural aspects of the monolithic
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15

Cubo, Teresa, Francisco Romero, Jose M. Vinardell, and Jose E. Ruiz-Sainz. "Expression of the Rhizobium leguminosarum biovar phaseoli melA Gene in Other Rhizobia Does Not Require the Presence of the nifA Gene." Functional Plant Biology 24, no. 2 (1997): 195. http://dx.doi.org/10.1071/pp96076.

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Many different Rhizobium strains produce melanin (Mel+) when grown on solid media supplemented with L-tyrosine. The composition of the media and the culture conditions are of great importance for pigment production. Previous reports showed that some Rhizobium leguminosarum biovar phaseoli strains that produce the pigment in complete solid media (TY) failed to produce the pigment in minimal media (SY) supplemented with L-tyrosine or in TY liquid media. In this paper we have investigated different R. fredii, R. meliloti, R. etli and R. leguminosarum bv. trifolii and phaseoli strains (all of them
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16

Wang, Shuai, Iker Agirrezabal-Telleria, Aditya Bhan, Dante Simonetti, Kazuhiro Takanabe, and Enrique Iglesia. "Catalytic routes to fuels from C1 and oxygenate molecules." Faraday Discussions 197 (2017): 9–39. http://dx.doi.org/10.1039/c7fd00018a.

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This account illustrates concepts in chemical kinetics underpinned by the formalism of transition state theory using catalytic processes that enable the synthesis of molecules suitable as fuels from C<sub>1</sub> and oxygenate reactants. Such feedstocks provide an essential bridge towards a carbon-free energy future, but their volatility and low energy density require the formation of new C–C bonds and the removal of oxygen. These transformations are described here through recent advances in our understanding of the mechanisms and site requirements in catalysis by surfaces, with emphasis on en
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17

Flores-Ramírez, Nelly, Erandini Guzmán-Mejía, Salomón R. Vásquez-García, Lada Domratcheva-Lvova, Leandro Garcia-Gonzalez, and Julián Hernández-Torres. "Development of an ecological varnish from the resin of pine." MRS Advances 3, no. 63 (2018): 3827–32. http://dx.doi.org/10.1557/adv.2018.599.

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ABSTRACTRosin resin is constituted by rosin acids, in particular, abietic acid, which is an inexpensive substance. This paper concerns the study of the molecular interactions between a bifunctional monomer of abietic acid with isocyanate to form polyurethane. Polyurethane is a varnish that can be applied to any timber surface protecting it from chemical and environmental factors. Furthermore, the polar groups (OH´s) of the diol have a direction along the molecular axis thus, increasing their intermolecular interactions with the isocyanate groups. The varnish named as (PAR), was synthesized in
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18

Antonio, Mark R., J. Malinsky, and L. Soderholm. "Synthesis and Properties of Lanthanide-Exchanged Preyssler's Heteropolyanions." MRS Proceedings 368 (1994). http://dx.doi.org/10.1557/proc-368-223.

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ABSTRACTNa+ in the Preyssler heteropolytungstate anion [NaP5W30O110]14− can be exchanged for a trivalent lanthanide ion. The potential significance of this new class of lanthanide heteropolyanions relates to their applications in catalysis science. This view follows from the fact that Keggin heteropolyanions and their free acids are used as heterogeneous solid catalysts and homogeneous solution catalysts. We describe synthetic conditions that lead to the incorporation of Ce3+ and Pr3+ within the Preyssler anion, and the coprecipitation of Ce3+ and the Preyssler anion. Initial studies indicate
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19

Zinchenko, V. F., and V. V. Menchuk. "ELECTRONEGATIVITY AND STRENGTH OF ACIDS AND BASES IN AQUEOUS SOLUTIONS." Odesa National University Herald. Chemistry 27, no. 1(81) (2022). http://dx.doi.org/10.18524/2304-0947.2022.1(81).255831.

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Сoncepts of acidity-basicity for systems of different types are considered. The application of the parameter of effective electronegativity for estimating the acidity is proposed, the value of which is calculated from the thermochemical data of acid-base reactions in the condensed state (liquid, solid). The basis is the value of electronegativity of SO3, which should be equal to 3.00. Its values are in the range of 2.0 ÷ 3.1 for acid oxides and 0.3 ÷ 1.6 for oxides of basic nature. A significant group consists of oxides of bifunctional nature (amphoteric oxides) whose electronegativity values
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