This article reports the use of combined techniques (thermal desorption and spectroscopic analysis) for characterization Brønsted sites in microporous solid catalysts. The specific aim was to provide a quantitative determination with slightly different acidities chabazite-related silicoaluminophosphate (SAPO) materials, which display three bridged hydroxyls, OHA, OHB, OHC, absorbing at 3630, 3614, 3600 cm-1, respectively. To this aim, approaches were employed. First, total concentration...

In this work, [Al]-SBA-15 samples were prepared by three different direct synthesis methods and one postsynthesis procedure, aiming to study the influence of preparation procedures on their structural, textural, physicochemical features. To aim, investigated combining experimental techniques (XRD, N2 physisorption, 27Al-MAS NMR, IR spectroscopy). All led formation aluminum-containing SBA-15 samples. Nevertheless, depending exhibited surface characteristics, especially in terms Brønsted Lewis...

Abstract A Nb V ‐containing saponite clay was designed to selectively transform toxic organosulfur chemical warfare agents (CWAs) under extremely mild conditions into nontoxic products with reduced environmental impact. Thanks the insertion of sites within framework, a bifunctional catalyst strong oxidizing and acid properties obtained. Remarkable activity high selectivity were observed for oxidative abatement (2‐chloroethyl)ethyl sulfide (CEES), simulant sulfur mustard, at room temperature...

Niobium-containing silica materials obtained by deposition via liquid-phase grafting or dry impregnation of niobocene(IV) dichloride are active and selective catalysts in the epoxidation alkenes presence aqueous hydrogen peroxide. The generation catalytically-active Nb species was followed step-by-step, investigated using a combined DR-UV-Vis, NIR, Raman, XRD, XANES EXAFS analyses. At end procedure, nature surface can be described as an oxo-Nb(V) site, tripodally grafted onto close proximity...

In this overview, a summary on the most common intercalation compounds based saponite clays is reported. The attention also focused one-pot methods for production of functional different applications.

This manuscript deals with the synthesis of different types zeolites from natural kaolinite samples for CO2 adsorption. A zeolite was prepared by means an alkaline fusion process, followed hydrothermal treatment, whereas a highly crystalline X synthesized optimizing previously mentioned synthetic procedure. In detail, SiO2/Al2O3 molar ratio in preliminary mixture modified addition secondary silicon source (sodium silicate) order to obtain one required X. The physicochemical properties...

Synthesis of a nanometric-size MCM-41 from biogenic silica obtained rice husk for the adsorption organic dyes aqueous phase.

A detailed spectroscopic study was carried out on Ti(IV)-containing catalysts obtained by grafting titanocene dichloride silica supports with different morphological features. The surface acidity and the local coordination accessibility of Ti(IV) active centers in Ti(IV)-grafted materials were studied FTIR diffuse reflectance (DR) UV−vis−NIR spectroscopies supplemented use probe molecules. DR spectroscopy also used to follow formation catalytic sites removal cyclopentadienyl moiety during...

Aluminum-modified magadiite samples with high concentration of aluminum have been synthesized under hydrothermal conditions by modifying the traditional preparation route layered siliceous material. A new synthetic strategy, named aluminum-induced crystallization (AIC) method, was thus developed to introduce different amounts Al in framework. systematic study physicochemical properties and thermal behavior produced Al-derived materials performed combining experimental techniques [infrared...

Molecular iodine was intercalated from nonaqueous solution into microsized ZnAl-layered double hydroxide (LDH) in the iodide form, generating I3–/I– redox couple interlayer region. Chloroform, ethanol, acetonitrile, or diethyl ether were used as solvents to dissolve molecular iodine. The intercalation compounds characterized by thermogravimetric analysis, X-ray powder diffraction, UV–vis spectroscopy, and scanning transmission electron microscopy. stability of iodine–solvent adducts...

Abstract Niobium(V)‐containing silica catalysts were prepared by deposition of niobocene dichloride onto the surface high‐surface area supports following a dry impregnation or liquid‐phase grafting approach. These materials used as heterogeneous for selective epoxidation, in presence aqueous hydrogen peroxide, representative set unsaturated fatty acid methyl esters (FAME), namely oleate, linoleate, and ricinoleate. They all proved to be water‐tolerant, recyclable, resistant metal leaching,...

MCM-41 nanoparticles have recently attracted growing scientific interest for applications in biomedical and diagnostic fields, nevertheless their use is limited because of the low hydrothermal stability, rendering them not suitable functionalisation (i.e. dye molecules loading, anchoring luminescent guests, etc.) aqueous media. In this work, nanosized was hydrothermally stabilised by properly adapting post-synthesis restructuring treatment already used conventional material (particle size...

Between the sheets: A novel hybrid material (see graphical representation) was prepared by intercalation of a bifunctional titanosilsesquioxane in synthetic sodium saponite. The used as filler polystyrene to create polymer nanocomposite with enhanced thermooxidative properties. Detailed facts importance specialist readers are published "Supporting Information". Such documents peer-reviewed, but not copy-edited or typeset. They made available submitted authors. Please note: publisher is...

The main methods for the design and preparation of single-site heterogeneous catalysts on inorganic oxide supports are described reviewed. Catalytically active metal sites can be either introduced into framework porous materials via direct synthesis or added to a pre-existing support by post-synthesis techniques. Particular attention is paid selected examples where geometry, nature chemical surroundings single site key factor obtain catalytic systems with enhanced chemo-, regio-...

Highly luminescent ZnO nanoparticles have been synthesized through a co-precipitation method, starting from solution of zinc acetate in methanol and precipitating the oxide phase basic media presence variable amounts aminopropyltriethoxy silane (APTS). The adopted conditions led to condensation between Zn-OH species alkoxy functionalities organosilane during formation (one-pot method) thus allowing covalent binding organic on surface. HR-TEM measurements indicated that samples with...

The instability of gas permeation rates over time in PIM-1-based membranes is one the obstacles preventing implementation this technology on larger scales. addition porous materials to PIM-1 matrix a known process reduce aging effects membranes. Many solids various chemical natures have been tested, ranging from inorganic inorganic–organic hybrids completely organic materials. Here, we report synthesis two hyper-cross-linked polymers (HCPs) based diphenyl sulfide monomer, synthesized either...

Per- and polyfluoroalkyl substances (PFASs), also called forever chemicals, are known for their high physicochemical stability. In the last decades, these chemicals have been widely employed numerous industrial applications. However, persistence in environment has increasingly raised concern regarding potential toxicity to living organisms including humans. Hence, need removal demands development of efficient methods reduce environmental impact. Here, a quaternary ammonium swellable...

Throw out the anchor! A new approach for preparation of heterogeneous catalysts based on a covalent anchoring an innovative multifunctional titanosisesquioxane inner surface silanols mesoporous silicas (SBA-15 and non-ordered silica) is proposed (see figure).