Abstract Methanol-to-olefins (MTO), the most important catalytic process producing ethylene and propylene from non-oil feedstocks (coal, natural gas, biomass, CO 2 , etc.), is hindered by rapid catalyst deactivation due to coke deposition. Common practice recover activity, i.e. removing via air combustion or steam gasification, unavoidably eliminates active hydrocarbon pool species (HCPs) favoring light olefins formation. Density functional theory calculations structured illumination...

A kinetic model for methanol to olefins (MTO) process over SAPO‐34 catalyst was established based on the dual‐cycle reaction mechanism. Simplifications were made by assuming olefins‐based cycle as virtual species S , and aromatics‐based R where former mainly accounts production of higher olefins, while latter lower olefins. Transformation considered with participation Meanwhile, a phenomenological deactivation developed account process. With proposed model, evolution conversion product...

Abstract Understanding the shallow geological structure of urban areas is crucial for effective planning and development underground spaces. Geophysical methods that are well-suited site-specific investigation have robustly anti-interference capabilities can provide important information areas. In support investigating 3D subsurface in Chengdu International Bio-City, a geophysical exploration study was conducted using three methods: electrical resistivity tomography (ERT), micro-seismic...

This paper estimates theoretically the diffusion-reaction behaviour of sulfate ion in concrete caused by environmental attack. Based on Fick's second law and chemical reaction kinetics, a nonlinear nonsteady equation concrete, which variable diffusion coefficient reactions depleting concentration are considered, is proposed. The finite difference method utilized to solve then it used simulate process distribution concrete. Afterwards, experiments for measuring carried out using EDTA verify...

Defects that commonly exist on the surface of zeolites pose notable mass transport constraints and influence catalytic performance. The mechanism underlying defects inducing molecular limitations, however, is not fully understood. Herein, we use versatile spectroscopy, imaging techniques, multiscale simulations to investigate effect in zeolites, intending establish terminal structure–mass transport–performance relationship. Isolated silanol, which represents foremost eventual chemical...

Abstract The stability of supported nano‐metal catalysts holds significant importance in both scientific and economic practice, beyond the long pursuit enhanced activity. While previous efforts have concentrated on augmenting interaction between nano‐metals carriers, thermodynamic macro‐perspective, to achieve optimized repression upon particle migration coalescence Ostwald ripening, nevertheless, microscale kinetics migrating catalyst particles driven by reaction remains unknown. In this...

Abstract Hydrophilic molecularly imprinted microspheres (MIP@SiO 2 ) for the adsorption of water‐soluble molecules in real aqueous samples were successfully synthesized. In this strategy, a molecular polymer (MIP) was encapsulated hollow core mesoporous silica (HMS) particles via ‘ship‐in‐a‐bottle’ process. As HMS shell contains plenty Si‐OH groups, as‐prepared proved to be hydrophilic and could well dispersed water. On other hand, MIP specifically recognize small with good binding...

A coke distribution model of catalyst particles in three‐dimensional space was developed based on population balance theory, and an analytic expression for zero‐dimensional time‐independent problem deduced. The shows that the is determined by average residence time, deposition (or burning) rate, inflow. further applied to methanol olefins (MTO) process. critical factors influencing MTO process, as well effect product selectivity, were investigated. Three scales fluidized bed...

Abstract In our previous article, we reported for the first time that oligonucleotides composed of one nucleotide species, example, oligo d(A) n , d(C) and d(T) could facilitate negatively charged sodium dodecyl sulfate/dodecyl triethyl ammonium bromide mixed micelles to transform vesicles. this study, will report facilitation ability self‐complementary hairpin‐structured oligonucleotides, d(A CT ) d(AT) ACT(AT) (or C(AT) ), on micelle‐to‐vesicle transition. It is found behavior...

Abstract Confinement of molecules in nanoporous crystalline materials results the unique and diverse characteristics intracrystalline diffusion adsorption, which can significantly affect efficiency gas separation and/or catalysis. However, understanding interplay between confinement adsorption remains elusive at quantitative level. In this work, it is found that could be related to hopping rate, might further connected translational rotational motion quantified by corresponding partition...

Abstract Hybrid nanocrystals of PVBA‐ b ‐PS/ZIF‐8 were prepared by the growth ZIF‐8 on surface self‐assembled structures from poly( p ‐vinylbenzoic acid)‐block‐polystyrene. Two different morphologies—micelles and vesicles—were obtained in selective solvents owing to ratios PVBA PS blocks. The structure morphology composites characterized Fourier transform IR spectroscopy, thermogravimetric analysis, X‐ray diffraction, transmission electron microscopy scanning microscopy. showed high...

A one-step synthesis method of bimetallic CuCoOS is reported, and the morphology structure catalyst are designed by changing molar ratio Cu Co. The can effectively treat Cr( vi ) in wastewater a dark environment.

Abstract The production of hydrocarbons for the synthesis readily available energy and multifunctional materials is great importance in modern society. Zeolites have proven to be a boon targeted regulation specific hydrocarbon as shape‐selective catalyst converting carbon resources. Yet our mechanistic understanding quantitative description shape‐selectivity zeolite catalysis remains rather limited, which restricts upgrade catalysts. Herein, we proposed principle using...

Abstract The zero‐length column (ZLC) method has been frequently used to measure the effective diffusivity of guest molecules in nanoporous crystalline materials. Recent studies unveiled that mass transport could originate from either intracrystalline diffusion and/or surface barriers. Directly quantifying and permeability molecules. therefore, is essential for understanding transfer thus optimizing design In this work, we extended ZLC method, based on a derived theoretical expression...