Design of Organic Structure-Directing Agents for the Controlled Synthesis of Zeolites for Use in Carbon Dioxide/Methane Membrane Separations.
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DOI: 10.1002/cplu.201900679
Abstract: One strategy to mitigate global warming is carbon capture and sequestration. Membrane separation is one promising approach to separation of CO2 from feed streams. Here we report the investigation of four zeolites that have been… read more here.
Keywords: carbon; directing agents; methane; structure directing ... See more keywords
Mesoporous TiO2 from poly(N,N-dimethylacrylamide)-b-polystyrene block copolymers for long-term acetaldehyde photodegradation
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DOI: 10.1007/s10853-019-04024-3
Abstract: Although already some mesoporous (2–50 nm) sol–gel TiO2 synthesis strategies exist, no pore size control beyond the 12 nm range is possible without using specialized organic structure-directing agents synthetized via controlled anionic/radical polymerizations. Here, we… read more here.
Keywords: tio2; block; poly dimethylacrylamide; structure directing ... See more keywords
Preparation of HZSM-5 catalysts with different ratios of structure directing agents and their effects on the decomposition of exo-tetrahydrodicyclopentadiene under supercritical conditions and coke formation
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DOI: 10.1016/j.apsusc.2020.145398
Abstract: Abstract Zeolite catalysts (ZSM-5) were synthesized using different ratios of structure directing agents (SDA) and Si/Al, and the synthesized ZSM-5 samples were used in the endothermic decomposition reaction of exo-tetrahydrodicyclopentadiene (exo-THDCP). The ZSM-5 synthesized with… read more here.
Keywords: different ratios; ratios structure; exo tetrahydrodicyclopentadiene; directing agents ... See more keywords
Synthesis of large single crystal of ZnAlPO4-15 by using melamine as structure directing agent
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DOI: 10.1016/j.jcrysgro.2020.125883
Abstract: Abstract We report effects of crystallization conditions and gel composition on the hydrothermal synthesis of large zinc-doped AlPO4-15 (ZnAlPO4-15) single crystals by using melamine (MA) as structure directing agent (SDA). By optimizing the following synthesis… read more here.
Keywords: using melamine; synthesis; melamine structure; znalpo4 ... See more keywords
Morphology effect of tungsten oxide on Ce/W catalyst for selective catalytic reduction of NO with NH3: Influence of structure-directing agents
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DOI: 10.1016/j.joei.2020.11.003
Abstract: Abstract The morphology effect of tungsten oxide on the NH3-SCR activity of the supported CeO2 catalyst was experimentally investigated by comparing the catalytic performance of WO3 in different morphologies. Nanoparticles (W-NP), nanorods (W-NR) and microspheres… read more here.
Keywords: morphology effect; directing agents; tungsten oxide; structure directing ... See more keywords
Influence of structure directing agents on synthesizing battery-type materials for flexible battery supercapacitor hybrids
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DOI: 10.1016/j.jtice.2019.04.010
Abstract: Abstract Nickel cobalt oxide with the high theoretical capacitance and abundant redox states is considered to be one of the most effective energy storage materials for battery supercapacitor hybrids. Morphology design is well adopted for… read more here.
Keywords: supercapacitor hybrids; battery supercapacitor; battery; structure directing ... See more keywords
Synthesis of mesoporous zeolites in fluoride media with structure-directing multiammonium surfactants
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DOI: 10.1016/j.micromeso.2016.09.037
Abstract: Abstract Mesoporous zeolite beta in pure-silica form and its analogues, including aluminosilicate, stannosilicate, and titanosilicate, were synthesized at near-neutral pH in the presence of fluoride ion as a mineralizer and piperidinium-functionalized multiammonium surfactant as a… read more here.
Keywords: zeolite beta; fluoride media; structure directing; multiammonium ... See more keywords
Probing locations of organic structure-directing agents (OSDAs) and host-guest interactions in CHA-type SAPO-34/44
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DOI: 10.1016/j.micromeso.2018.01.002
Abstract: Abstract In this work, we have synthesized four SAPO-34/44 (framework type code: CHA) samples by utilizing different organic structure-directing agent (OSDA) such as cyclohexylamine (CA), n-butylamine (BA), diisopropylamine (DIPA), and dipropylamine (DPA). An approach combining… read more here.
Keywords: guest interactions; sapo; structure directing; host guest ... See more keywords
Versatile phosphorus-structure-directing agent for direct preparation of novel metallosilicate zeolites with IFW-topology
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DOI: 10.1016/j.micromeso.2021.111005
Abstract: Abstract To fabricate a novel metallosilicate zeolite with a tridirectional pore system of 8- and 10-ring channels, direct incorporation of B, Al and Ga into small and medium pore ITQ-52 zeolite with the IFW-type topology… read more here.
Keywords: topology; novel metallosilicate; directing agent; structure directing ... See more keywords
Supramolecular coordination assemblies of 1,2,3-hexamethylcucurbit[5]uril with alkali metal ions based on the outer-surface interactions of cucurbit[n]urils
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DOI: 10.1016/j.molstruc.2018.12.101
Abstract: Abstract Alkali cations (A+ = Na+, K+, Rb+, Cs+) were coordinated with 1,2,3-hexamethylcucurbit[5]uril (1,2,3-HMeQ[5]) using different structure directing agents. Single crystal X-ray diffraction revealed the formation of heterometallic molecular capsule-like complexes in the presence of [CdCl4]2− anions… read more here.
Keywords: supramolecular coordination; hexamethylcucurbit uril; structure directing; structure ... See more keywords
One-Step Synthesis of Hierarchical ZSM-5 Using Cetyltrimethylammonium as Mesoporogen and Structure-Directing Agent
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DOI: 10.1021/acs.chemmater.7b00913
Abstract: Hierarchical ZSM-5 zeolite is hydrothermally synthesized in a single step with cetyltrimethylammonium (CTA) hydroxide acting as mesoporogen and structure-directing agent. Essential to this synthesis is the replacement of NaOH with KOH. An in-depth solid-state NMR… read more here.
Keywords: hierarchical zsm; mesoporogen structure; structure directing; directing agent ... See more keywords