Development of mesoporous ZSM-5 zeolite with microporosity preservation through induced desilication
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DOI: 10.1007/s10853-020-04855-5
Abstract: Alkali treatment is a widely used strategy to create mesopores for microporous zeolites to decrease the diffusion limitation in micropores. However, many of the micropore losses existed due to the uncontrollable destruction of framework. In… read more here.
Keywords: desilication; mesoporous zsm; development mesoporous; zsm zeolite ... See more keywords
Preparation, scale-up and application of meso-ZSM-5 zeolite by sequential desilication–dealumination
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DOI: 10.1007/s10934-017-0391-4
Abstract: Meso-ZSM-5 zeolites with unique catalytic cracking properties have been prepared from commercial ZSM-5 using sequential desilication–dealumination strategy. Desilication and dealumination conditions, including concentration, temperature, dissolution time and liquid–solid ratio were systematically studied and optimized. Characterization… read more here.
Keywords: meso zsm; desilication dealumination; desilication; sequential desilication ... See more keywords
Hierarchical ZSM-5 zeolite designed by combining desilication and dealumination with related study of n-heptane cracking performance
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DOI: 10.1007/s10934-018-0587-2
Abstract: The effect of the basic (NaOH) and/or acid (citric acid and EDTA-2Na) treatment of ZSM-5 zeolite has been studied comparing the structural and acidic features and their catalytic performance in n-heptane cracking. The properties of… read more here.
Keywords: heptane cracking; desilication dealumination; desilication; acid ... See more keywords
Desilication mechanism and kinetics of synthesized hydroxy-sodalite in high-alkali sodium aluminate solutions
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DOI: 10.1007/s11144-019-01565-1
Abstract: Desilication in the solution with Na2O concentration below 300 g/L was extensively studied, such as various desilication agents mostly of calcium salts or compounds proposed in the literature. However, desilication in high-alkali sodium aluminate solution was… read more here.
Keywords: high alkali; mechanism; desilication; solution ... See more keywords
Desilication and Recycling of Alkali-Silicate Solution for Low-Grade High-Silica Bauxite Utilization
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DOI: 10.1007/s11837-019-03934-6
Abstract: This study investigated the effects of CaO addition amount, initial caustic and silica concentrations, and reaction temperature on the desilication ratio in an alkali-silicate solution. The optimal desilication conditions for an alkali-silicate solution with active… read more here.
Keywords: silica; desilication; alkali silicate; solution ... See more keywords
Pyridine assisted desilication of mordenite
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DOI: 10.1016/j.apcata.2019.117139
Abstract: Abstract Pyridine assisted alkaline desilication has been elaborated as new post-synthetic modification strategy of mordenite. The addition of pyridine during the desilication treatment revealed to impact materials properties through a dual action on textural and… read more here.
Keywords: desilication; desilication mordenite; assisted desilication; pyridine assisted ... See more keywords
Desilication and recycling of alkali-silicate solution seeded with red mud for low-grade bauxite utilization
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DOI: 10.1016/j.jmrt.2020.04.095
Abstract: Abstract When low-grade high-silica bauxite undergoes desilication by alkaline leaching, a large amount of alkali-silicate solution will be produced. To realize its recycling, the alkali-silicate solution needs to be desiliconized. In this study, the effectiveness… read more here.
Keywords: red mud; desilication; alkali silicate; silicate solution ... See more keywords
Generation of parallelepiped-shaped mesopores and structure transformation in highly stable ferrierite zeolite crystals by framework desilication in NaOH solution
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DOI: 10.1016/j.micromeso.2017.05.050
Abstract: Abstract Desilication and recrystallization of a low-silica NaK-form ferrierite (NaKFER) were conducted by one-step hydrothermal method in sodium hydroxide solution containing cetyltrimethylammonium bromide (CTAB). The attack by NaOH induced unprecedented mesopore formation in highly stable… read more here.
Keywords: stable ferrierite; crystals framework; transformation; desilication ... See more keywords
Hierarchical zeolites Y obtained by desilication: Porosity, acidity and catalytic properties
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DOI: 10.1016/j.micromeso.2017.11.051
Abstract: Abstract The porosity, acidity and catalytic properties of zeolite Y desilicated in NaOH, tetrabutylammonium hydroxide (TBAOH) and NaOH/TBAOH mixture were investigated. The parent dealuminated zeolite Y of Si/Al = 31 contained very strongly acidic Si-OH-Al groups (more… read more here.
Keywords: desilication; acidity; catalytic properties; porosity acidity ... See more keywords
Preparation of hierarchical HZSM-5 zeolites with combined desilication with NaAlO2/tetrapropylammonium hydroxide and acid modification for converting methanol to propylene
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DOI: 10.1039/c8ra08624a
Abstract: In the present work, mesoporosity is introduced into highly siliceous HZSM-5 zeolites (SiO2/Al2O3 = 400) by a two-step path including desilication using NaAlO2 and TPAOH (tetrapropylammonium hydroxide) mixtures, followed by acid washing treatment. The physicochemical… read more here.
Keywords: hzsm zeolites; acid washing; desilication; hzsm ... See more keywords
Enhanced Desilication of High Alumina Fly Ash by Combining Physical and Chemical Activation
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DOI: 10.3390/met9040411
Abstract: In this work, a physical–chemical activation desilication process was proposed to extract silica from high alumina fly ash (HAFA). The effects of fly ash size, hydrochloric acid concentration, acid activation time, and reaction temperature on… read more here.
Keywords: activation; physical chemical; desilication; chemical activation ... See more keywords