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Photocatalytic conversion of lignocellulose to valuable aromatics has significant potential for applications in biorefineries. The photocatalyst efficiency is typically limited by the buffering redox system combination with oxidation and reduction photoexcited holes electrons, respectively, which ensures high charge-recombination rates. Herein, Ag+-exchanged CdS employed easy electron transfer oxidized intermediate, results a marked increase yield product selectivity under mild reaction...

Carbon molecular sieve (CMS) membranes are considered game-changers to overcome the challenges that conventional polymeric face. However, CMS also confront a challenge in successfully separating extremely similar-sized molecules. In this article, high-precision tuning of microstructure is proposed by controlled electron irradiation for separation molecules with size differences less than 0.05 nm. Fitting targeted can be accomplished dosage control, resulting highly-efficient C2H4/C2H6 low...

Abstract Poly(butylene adipate‐ co ‐terephthalate) (PBAT) is a biodegradable polymer with high ultimate elongation but low modulus. This work studied the addition of rigid bio‐based and polymer, poly(lactic acid) (PLA), along organically modified silicate layers as conceivable means to improve modulus PBAT. Blending PLA would also reduce both cost blend its dependence on nonrenewable resources. Compounds PBAT showed significantly improved tensile flexural strength resulting in enhanced...

Abstract Polypropylene–maleic anhydride (PP–MA) graft copolymers were produced from isotactic homopolymer polypropylene (molecular weight > 150,000) utilizing the technique of solid phase copolymerization. A high degree (about 8–10%) was achieved on 150 mesh (U.S. Standard Sieve) samples using this process. This free‐radical‐initiated, catalyst‐aided grafting process effective at low temperatures (100–120°C), atmospheric pressure, and residence times (60 min). The powder mixed in a shear,...

Two distinct N-containing POCs show exceptional Br 2 vapor adsorption ability and different reversibility of by forming charge-transfer complexes with polybromide species, as demonstrated experimental investigations DFT calculations.

Abstract Methanol can be converted into gasoline boiling range hydrocarbons over zeolite ZSM-5 catalyst using the Mobil MTG process. feed in process derived from coal or natural gas based syngas. The involves conversion steps of syngas-to-methanol and methanol-to-gasoline. Dimethyl Ether (DME), a product methanol dehydrocondensation, is an intermediate species methanol-to-gasoline conversion. Syngas directly to DME Liquid Phase Synthesis (LP-DME) developed at University Akron conjunction...

Abstract Solvents or interfacial agents have been used as media to perform various polymerization reactions. The selection of solvents provide the appropriate medium for reaction has opened up a totally new area research. In present study, three solvents, viz., toluene, decalin, and tetralin, were investigated in preparation polypropylene‐maleic anhydride copolymers by solid phase graft copolymerization. level was quantitatively determined wet chemical methods qualitative confirmations made...

Abstract The mechanical and morphological properties of polypropylene/nylon 6 blends compatibilized with PP grafted maleic anhydride (PP‐g‐MA) styrene/ethene‐co‐butene/styrene (SEBS‐g‐MA) are studied using a special version factorial design known as extreme vertices. Properties examined include yield stress, modulus, elongation, toughness, impact strength morphology. Comparisons made between various treatment combinations (i.e. variety blends) polypropylene homopolymer statistical methods...

Abstract A simple particle model is used to interpret differential thermogravimetric data taken on the gasification of coal/char with CO 2 , H and O. The takes into account major physical factors which influence rate, viz. changing magnitudes surface area, porosity, activation energy effective diffusivity during gasification. Specific reaction rate constants based area energies are extracted from data. Practical criteria for regimes diffusion control isothermality developed. For isothermal...

ABSTRACT The mass transfer characteristics of the liquid phase methanol synthesis process were experimentally investigated using a one-liter, mechanically agitated slurry reactor. CuO/ZnO/Al2O3 catalyst was crushed to -140 mesh and suspended in an inert mineral oil (Witco # 40). loading varied within limits experimental feasibility. effects temperature, pressure, level oil, impeller speed, gas flow rate on overall gas-liquid coefficient KLiaB studied results obtained two-level,...

Abstract Dimethyl ether (DME) can be produced much more efficiently in a single-stage, liquid-phase process from natural gas-based syngas as compared to the conventional via dehydration of methanol. This process, based on dual catalysts slurried inert oil, alleviates chemical equilibrium limitation governing methanol synthesis reaction and concurrently improves per-pass conversion reactor productivity. The potential, therefore, for production methyl acetate dimethyl carbonylation is...

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPore diffusional limitations in the liquid-phase methanol synthesis processVetkav Parameswaran and Sunggyu LeeCite this: Energy Fuels 1987, 1, 2, 217–222Publication Date (Print):March 1987Publication History Published online1 May 2002Published inissue 1 March 1987https://pubs.acs.org/doi/10.1021/ef00002a013https://doi.org/10.1021/ef00002a013research-articleACS PublicationsRequest reuse permissionsArticle Views258Altmetric-Citations14LEARN ABOUT...

Abstract Testing kinetic models against a “true” and detailed expression was the aim of Workshop on Kinetic Model Development at Denver AIChE Meeting in August, 1983. For this purpose an artificial reaction mechanism created, based known thermodynamics methanol synthesis as framework. The rate laws, that were derived from mechanism, made thermodynamically consistent by achieving agreement between equilibrium constants calculated various temperatures given, real original thermodynamic...

Abstract Graft copolymerization of styrene onto poly(vinyl chloride) (PVC) and polypropylene (PP) was carried out in a supercritical CO 2 medium using AIBN as free radical initiator. The served reaction addition to being solvent for the monomer temperature pressure were kept above critical points solvent‐monomer mixture form homogeneous single‐phase medium. resulting graft copolymers characterized Fourier transform infrared spectroscopy (FTIR), differential scanning calorimetry (DSC),...

Abstract Preliminary investigations to study the feasibility of using polystyrene grafted with acrylic acid blend (PS) and nylon 6,6 (N66) have been done. The graft copolymer (PS‐g‐AA) was synthesized by reacting in presence a free radical initiator solid phase copolymerization technique. Binary blends N66/PS N66/PS‐g‐AA were melt mixing. formation (PS‐g‐AA)‐co‐N66 during preparation has desired. morphologies observed scanning electron microscopy (SEM). Significant reductions domain sizes...

Abstract Utilization of biomass and waste products for the production synthesis gas is an important step towards generating useful fuels from renewable resources. Cellulose glycerin are two such that can either be decomposed into chemicals or completely gasified. One technique used decomposition these compounds in a supercritical water medium. To use this process effectively, complete comprehensive understanding reaction pathway kinetics required. Two intermediate produced during cellulose...

ABSTRACT The liquid phase methanol (LPMeOHTM) synthesis process is to be commercially carried out in a entrained reactor (LER), where the catalyst-inert oil slurry pumped through reaction zone along with syngas fed separately. A computer model was developed based on experimental results, for LPMeOHTM reactor. This program accurately predicts multicomponent equilibria, ultimate chemical equilibria and compositions of each reactant product species exiting prediction results this modeling...

The effects of surface coating cellulose II-based micro-fibrillated celluloses (MFCs) prepared with high concentration alkali treatment with/without co-solvent and then subsequent grinding were investigated in terms physical properties the coated papers. It was found that both I MFC II MFCs improved paper strength increasing pick-up MFCs. A similar magnitude increase observed between Optical slightly impaired papers showed a less color deviation higher brightness than MFC. No distinctive...

Hardwood bleached kraft pulp (HwBKP) was dissolved with 1-butyl-3-methylimidazolium chloride ([Bmim]Cl) and N,N-dimethylformamide (DMF) at 110℃, cellulose beads were prepared by dropping the [Bmim]Cl/DMF/cellulose solution into water. The effects of mixing ratio [Bmim]Cl DMF on properties are investigated in this paper. Increasing decreased viscosity surface tension solution. Moreover, all solutions various ratios showed shear thinning behavior. 800-1500 μm diameters varying (the...