Spherosilicate, consisting of a double 4-ring cyclosilicate core (D4R; Si8O20) with every corner functionalized dimethylsilyl chloride group (-SiMe2Cl), was used as node to construct an isoreticular series porous expanded network materials. Interconnecting the nodes linear, aliphatic α,ω-alkanediol linker molecules yields PolySilicate Porous Organic Polymers (PSiPOPs), new type ordered reticular material related well-known metal–organic and covalent organic frameworks (MOFs COFs). In...

This work describes the synthesis of ordered 3D siloxane-silsesquioxane reticular materials with silicate D4R cubes (Si8O208−), harvested from a sacrificial tetrabutylammonium cyclosilicate hydrate (TBA-CySH) precursor, interlinked octyl and dicyclopentyl (Cp2) hydrocarbon functionalities in one-step organodichlorosilanes. Advanced solid-state NMR spectroscopy allowed us to unravel molecular order nodes their interconnection by silicone linkers. In case octyl-methyl linkers, changing...

The design of functional micro- and mesostructured composite materials is significantly important for separation processes.

Palladium exhibits a complex chemistry in the PNA process, especially presence of gas mixtures containing CO and NOx. In this work mechanism NOx adsorption with CO, O2, H2O on Pd/FER zeolite is investigated. The redox state palladium its clustering during high-temperature pretreatment was Insight into chemisorption gained by detailed monitoring evolution COx concentrations. Oxidized required for achieving adsorption. Clustered zerovalent reduced H2 did not adsorb O2. Evidence provided...

Commercial titanium dioxide nanomaterials were found to be active in selective photocatalytic oxidation of ammonia dinitrogen (photo-NH3-SCO). Photoactivated conversion 1000 ppm simulated air with high selectivity for was achieved over a thin layer TiO2 flow reactor at 150 °C, 300 h−1 volume hourly space velocity and 1.1 mW cm−2 UVA illumination.

A new synthesis method for preparing spherosilicates with a double-four-ring (D4R) silicate core (Si8O12) and functional siloxy substituents such as (OSi(CH3)2Cl) on the vertices was discovered. Key to this achievement of [N(n-C4H9)4]H7[Si8O20]·5.33H2O D4R cyclosilicate hydrate precursor crystals having only 5.33 water molecules per unit, which is much smaller than number in state-of-the-art tetramethylammonium- choline-containing that have up 65 D4R. The low content allows use bifunctional...

LEV type zeolites were synthesized with four different structure-directing agents and converted to copper loaded NH3-SCR catalysts. The synthesis recipe was found impact the respective Al population in two topologically framework sites double single 6-rings, resolvable by 27Al MAS NMR spectroscopy. Hydrothermal stability be related silanol concentration, Si/Al ratio, particle size, crystal morphology, defects, external surface area, microporosity. Catalytic activity dependent on preferential...

An important aspect within zeolite synthesis is to make fully tunable framework materials with controlled aluminium distribution. A major challenge in characterising these zeolites at operating conditions the presence of water. In this work, we investigate effect hydration on

A new copolymer consisting of double four ring (D4R) silicate units linked by dimethylsilicone monomer referred to as polyoligosiloxysilicone number one (PSS-1) was synthesized. The D4R building unit is provided hexamethyleneimine cyclosilicate hydrate crystals, which were dehydrated and reacted with dichlorodimethylsilane. local structure dimethyl silicone monomers revealed multidimensional solid-state NMR, FTIR modeling. On average, have 6.8 linkages. Evidence for preferential...

Abstract Polyoligosiloxysilicone (POSiSil; designated PSS‐2) is a copolymer of double four‐ring (D4R) cyclosilicate and dimethylsiloxane. It synthesized by linking D4R units in tetrabutylammonium crystals with dimethyldichlorosilane. The structure PSS‐2 was revealed using solid state NMR spectroscopy. In this 3D are connected systematically short siloxane chains most likely composed 2 to 3 dimethylsiloxane monomers. Controlling the conversion parent material allows for tuning porosity PSS‐2....

The 1 H-29 Si multiple-contact cross polarization (MC-CP) MAS NMR experiment is evaluated for the class of silicate-siloxane copolymers called POSiSils, that is, polyoligosiloxysilicones. It proves a reasonably good solution to tackle challenge recording quantitative 29 data in experimental time much reduced compared with single pulse acquisition. In second time, we report Si-29 MC-CP double-quantum single-quantum (MC-CP-DQ-SQ) experiment, which provides information about through-space...

This study examines the development of effective passive adsorption materials for NOx removal, with a primary focus on unraveling dynamics palladium species impregnated onto zeolite under hydrothermal oxidation conditions. Employing in situ transmission electron microscopy (TEM), research elucidates formation volatile masses at lower temperatures, gradually coalescing during temperature escalation. At pinnacle 750 °C, dispersal process ensues, liberating highly mobile smaller particles. The...

Selective catalytic reduction (SCR) of NOx by ammonia is one the dominant pollution abatement technologies for near-zero emission diesel engines. A crucial step in to N2 with Cu zeolite NH3-SCR catalysts generation a multi-electron donating active site, implying permanent or transient dimerization ions. atom mobility has been implicated computational chemistry as key factor this process. This report demonstrates how variable temperature 1H NMR reveals induced sharp resonances associated low...

RHO zeolites were synthesized from aluminosilicate gels with sodium and cesium and, optionally, 18-crown-6 ether as a structure directing agent. Phase-pure zeolite samples different Si/Al ratios particle morphologies obtained. In the presence of crown phase, pure was obtained in range 3.4–3.8, which appeared spherical agglomerates nanosized crystallites. absence high-sodium concentration, nanometer-size ratio 1.5 polyhedral morphology Lowering content synthesis mixture resulted...

Spherosilicate, consisting of a double 4-ring cyclosilicate core (D4R; Si8O20) with every corner functionalized dimethylsilyl chloride group (-SiMe2Cl), was used as node to construct an iso-reticular series porous expanded network materials. Interconnecting the nodes linear, aliphatic {\alpha},{\omega}-alkanediol linker molecules yields PolySilicate Porous Organic Polymers (PSiPOPs), new type ordered reticular material related well-known metal-organic and covalent organic frameworks (MOFs &...

Thin hydrophobic polyoligosiloxysilicone (POSiSil) films were synthesized on silicon wafer substrates by spin coating reactive nanometer-sized spherosilicate solutions. Surface roughness was spontaneously induced due to the generation of HCl gas bubbles during procedure, involving cross-linking and solidification spherosilicates. Variations in solution and/or relative humidity curing phase allowed for a degree precision controlling this roughness, thereby impacting parameters such as...

Palladium exhibits a complex chemistry in the PNA process, especially presence of gas mixtures containing CO and NOx. In this work mechanism NOx adsorption with CO, O2 H2O on Pd/FER zeolite is investigated. The redox state palladium its clustering during high temperature pretreatment was Insight chemisorption gained by detailed monitoring evolution COx concentrations. Oxidized required for achieving adsorption. Clustered zero-valent reduced H2 inactive O2. Evidence provided reaction...

Palladium exhibits a complex chemistry in the PNA process, especially presence of gas mixtures containing CO and NOx. In this work mechanism NOx adsorption with CO, O2 H2O on Pd/FER zeolite is investigated. The redox state palladium its clustering during high temperature pretreatment was Insight chemisorption gained by detailed monitoring evolution COx concentrations. Oxidized required for achieving adsorption. Clustered zero-valent reduced H2 inactive O2. Evidence provided reaction...