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Influence of the Mesoporosity of Hierarchical ZSM-5 in Toluene Alkylation by Methanol. MATERIALS (BASEL, SWITZERLAND) 2023; 16:6872. [PMID: 37959471 PMCID: PMC10649414 DOI: 10.3390/ma16216872] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/10/2023] [Revised: 10/20/2023] [Accepted: 10/20/2023] [Indexed: 11/15/2023]
Abstract
Among the different strategies to design highly shape-selective ZSM-5 to obtain para-xylene through toluene alkylation with methanol, the introduction of mesopores to increase reactant and product diffusion has been proposed but barely studied. In this study, we prepared mesoporous ZSM-5 catalysts, named ZSM5-MT(x), from commercial ZSM-5 (Si/Al = 15), using a two-step micelle-templating procedure with octadecyltrimethylammonium bromide as a surfactant in basic medium (x = NaOH/Si). These materials were used as catalysts for the alkylation of toluene by methanol at a low contact time to avoid thermodynamic equilibrium of the xylene isomers. Compared to the parent ZSM-5, the mesoporous ZSM5-MT(x) catalysts did not improve the para-xylene selectivity, revealing that the strategy of increasing diffusion in the catalyst is not a good strategy to follow. However, ZSM5-MT(0.5) showed less deactivation on stream than the parent ZSM-5. Therefore, introducing mesopores to ZSM-5 could be interesting to explore, combined with another strategy of shape selectivity, such as the passivation of the external surface acidity.
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Engineering the Morphostructural Properties and Drug Loading Degree of Organic-Inorganic Fluorouracil-MgAl LDH Nanohybrids by Rational Control of Hydrothermal Treatment. ACS OMEGA 2023; 8:26102-26121. [PMID: 37521604 PMCID: PMC10372945 DOI: 10.1021/acsomega.3c02288] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/05/2023] [Accepted: 06/13/2023] [Indexed: 08/01/2023]
Abstract
Layered double hydroxides (LDHs) or hydrotalcite-like compounds have attracted great attention for the delivery of anticancer drugs due to their 2D structure, exhibiting a high surface-to-volume ratio and a high chemical versatility. The drug is protected between the layers from which it is slowly released, thus increasing the therapeutic effect and minimizing the side effects associated to nonspecific targeting. This work aimed to design LDHs with Mg and Al (molar ratio of 2/1) in brucite-like layers, which retained fluorouracil (5-FU; 5-FU/Al = 1, molar ratio) in the interlayer gallery as the layers grow during the co-precipitation step of the synthesis. To rationally control the physicochemical properties, particularly the size of the crystallites, the aging step following the co-precipitation was performed under carefully controlled conditions by changing the time and temperature (i.e., 25 °C for 16 h, 100 °C for 16 h, and 120 °C for 24 h). The results revealed the achievement of the control of the size of the crystals, which are gathered in three different agglomeration systems, from tight to loose, as well as the loading degree of the drug in the final organic-inorganic hybrid nanomaterials. The role played by the factors and parameters affecting the drug-controlled release was highlighted by assessing the release behavior of 5-FU by changing the pH, solid mass/volume ratio, and ionic strength. The results showed a pH-dependent behavior but not necessarily in a direct proportionality. After a certain limit, the mass of the solid diminishes the rate of release, whereas the ionic strength is essential for the payload discharge.
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Zeolite-based catalysis for isobutene conversion into chemicals and fuel additives. A review. CR CHIM 2022. [DOI: 10.5802/crchim.149] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Abstract
An experimental study of the ethylene dimerization and isomerization performed on a mesoporous 2 wt% Ni-AIKIT-6 showed that the kinetically determining step is the insertion of ethylene in the metal–alkyl bond at the nickel site neighborhood.
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Direct conversion of ethylene to propylene over Ni- and W-based catalysts: An unprecedented behaviour. CATAL COMMUN 2020. [DOI: 10.1016/j.catcom.2020.106091] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022] Open
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6
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Direct Transformation of Ethylene to Propylene by Cascade Catalytic Reactions under Very Mild Conditions. Ind Eng Chem Res 2020. [DOI: 10.1021/acs.iecr.0c00450] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Ethylene Oligomerization from Diluted Stream over Ni-Containing Heterogeneous Catalysts. Ind Eng Chem Res 2020. [DOI: 10.1021/acs.iecr.9b05576] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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8
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Direct transformation of butenes or ethylene into propylene by cascade catalytic reactions. Catal Sci Technol 2019. [DOI: 10.1039/c9cy00870e] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Catalysts and processes involved in the direct conversion of ethylene or n-butenes into propylene are reviewed.
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Unconventional Pathways for Designing Silica-Supported Pt and Pd Catalysts With Hierarchical Porosity. STUDIES IN SURFACE SCIENCE AND CATALYSIS 2019. [DOI: 10.1016/b978-0-444-64127-4.00018-5] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
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11
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Hierarchically porous Pd/SiO2 catalyst by combination of miniemulsion polymerisation and sol-gel method for the direct synthesis of H2O2. Catal Today 2018. [DOI: 10.1016/j.cattod.2016.12.021] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Modeling biosorption of Cr(VI) onto Ulva compressa L. from aqueous solutions. WATER SCIENCE AND TECHNOLOGY : A JOURNAL OF THE INTERNATIONAL ASSOCIATION ON WATER POLLUTION RESEARCH 2018; 77:60-69. [PMID: 29339604 DOI: 10.2166/wst.2017.509] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
The marine biomass Ulva compressa L. (ECL) was used as a low-cost biosorbent for the removal of Cr(VI) from contaminated aqueous solutions. The operating variables were optimized: pH ∼ 2, initial concentration of 25 mg/L, solid/liquid ratio of 6 g/L and a temperature of 50 °C, leading to an uptake elimination of 96%. A full factorial experimental design technique enabled us to obtain a mathematical model describing the Cr(VI) biosorption and to study the main effects and interactions among operational parameters. The equilibrium isotherm was analyzed by the Langmuir, Freundlich and Dubinin-Radushkevich (D-R) models; it has been found that the adsorption process follows well the Langmuir model. Kinetic studies showed that the pseudo-second order model describes suitably the experimental data. The thermodynamic parameters indicated an endothermic heat and a spontaneity of the Cr(VI) biosorption onto ECL.
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Conversion of Methyl Mercaptan to Hydrocarbons over H-ZSM-5 Zeolite: DFT/BOMD Study. ACS OMEGA 2017; 2:4647-4656. [PMID: 30023728 PMCID: PMC6044670 DOI: 10.1021/acsomega.7b00756] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/08/2017] [Accepted: 08/03/2017] [Indexed: 06/08/2023]
Abstract
Methyl mercaptan-a harmful impurity in natural gas-may be selectively converted into H2S and hydrocarbons [methyl mercaptan to hydrocarbon (M2TH) process], using zeolite catalysts. When M2TH is compared with the well-known MTH (methanol to hydrocarbons) process, significant differences emerge, essentially regarding the formation and distribution of products. Density functional theory (DFT) and Born-Oppenheimer molecular dynamics (BOMD) were employed to reveal possible origins for the experimentally observed differences. We established a close similarity between DFT intrinsic (electronic) reaction profiles in the stepwise mechanism of methanol and mercaptan dehydration, although no variance in reactivity was revealed. BOMD simulations at the experimental temperature of 823 K reveal rapid hydrogen abstraction from the methyl group in mercaptan, adsorbed in the zeolite cavity in the presence of the methoxy intermediate. The formation of •CH2SH radical is 10 times faster than that of •CH2OH at the same temperature. The varied reactivity of methanol and mercaptan in MTH and M2TH processes, respectively, can therefore first be attributed to very rapid hydrogen abstraction in mercaptan, which occurs in the zeolite cavity, following the formation of surface methoxy.
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Nickel and molybdenum containing mesoporous catalysts for ethylene oligomerization and metathesis. NEW J CHEM 2016. [DOI: 10.1039/c5nj02586a] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Ethylene is converted into propylene by one-pot cascade reactions over catalysts prepared using a commercial mesoporous non-ordered silica as a support.
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19
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Selective conversion of styrene oxide to 2-phenylethanol in cascade reactions over non-noble metal catalysts. Catal Sci Technol 2016. [DOI: 10.1039/c5cy00779h] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Three cascade reactions using green efficient processes based on heterogeneous catalysts are proposed to selectively obtain 2-phenyl ethanol from styrene.
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Hydroconversion of n-hexadecane over bifunctional microporous and mesoporous model catalysts. Influence of pore architecture on selectivity. J Catal 2015. [DOI: 10.1016/j.jcat.2015.05.026] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Abstract
New silica–titania mesoporous catalysts with improved performance were achieved by combining surface and templating properties of α-chitin nanorods recovered from biomass with sol–gel and spray-drying processes.
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Photocatalytic activity of spinel ZnFe2−xCrxO4 nanoparticles on removal Orange I azo dye from aqueous solution. J Taiwan Inst Chem Eng 2014. [DOI: 10.1016/j.jtice.2013.12.002] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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24
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Cr3+ and Al3+ co-substituted zinc ferrite: Structural analysis, magnetic and electrical properties. Polyhedron 2014. [DOI: 10.1016/j.poly.2013.12.022] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Abstract
The properties of Ni-based inorganic porous materials and their catalytic performance in ethylene oligomerization are reviewed.
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Enhancing the performance of SBA-15-supported copper catalysts by chromium addition for the chemoselective hydrogenation of trans-cinnamaldehyde. Catal Sci Technol 2013. [DOI: 10.1039/c3cy00198a] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Distillate-range products from non-oil-based sources by catalytic cascade reactions. CHEMSUSCHEM 2012; 5:1787-1792. [PMID: 22761058 DOI: 10.1002/cssc.201200092] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/03/2012] [Indexed: 06/01/2023]
Abstract
An original two-step process efficiently catalyzed by functionalized mesoporous materials is proposed as a potential route for converting light olefins into long-chain hydrocarbons in the distillate range. In the first step, ethylene can be selectively transformed into C₄ -C₁₀ olefins with an even number of carbon atoms, over nickel-exchanged AlMCM-41, at 150 °C. When the nickel-catalyzed oligomerization was assisted by a second acid-catalyzed step over H-MCM-41, olefins with chains longer than 10 carbon atoms were mainly produced with a productivity of 180 g g⁻¹ h⁻¹.
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Efficient mesoporous silica–titania catalysts from colloidal self-assembly. Chem Commun (Camb) 2012; 48:10648-50. [DOI: 10.1039/c2cc35127g] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Zeolite Y Crystals with Trimodal Porosity as Ideal Hydrocracking Catalysts. Angew Chem Int Ed Engl 2010; 49:10074-8. [DOI: 10.1002/anie.201004360] [Citation(s) in RCA: 233] [Impact Index Per Article: 16.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Mesoporous silica functionalized with 1-furoyl thiourea urea for Hg(II) adsorption from aqueous media. JOURNAL OF HAZARDOUS MATERIALS 2010; 182:197-203. [PMID: 20573446 DOI: 10.1016/j.jhazmat.2010.06.015] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/10/2010] [Revised: 03/30/2010] [Accepted: 06/03/2010] [Indexed: 05/29/2023]
Abstract
New organic-inorganic hybrid materials were prepared by covalently anchoring 1-furoyl thiourea on mesoporous silica (SBA-15). By means of various characterization techniques (X-ray diffraction, nitrogen adsorption-desorption, thermogravimetric analysis, and FTIR spectroscopy) it has been established that the organic groups were successfully anchored on the SBA-15 surfaces and the ordering of the inorganic support was preserved during the chemical modifications. The hybrid sorbents exhibited good ability to remove Hg(II) from aqueous solution. Thus, at pH 6, the adsorption capacity of mercury ions reached 0.61 mmol g(-1).
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Hydrogenation of Unsaturated Carbonyl Compounds on non-Calcined LDHs. I. Synthesis and Characterization of ZnNiCuAl Hydrotalcite-like Materials. Acta Chim Slov 2010; 57:677-685. [PMID: 24061816] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/02/2023] Open
Abstract
Several Zn/Ni/Cu/Al layered double hydroxides (LDH) with variable Ni/Cu ratios but constant Zn/Al, as well as M2+/M3+ ratios, were synthesized by coprecipitation method with CO32- as compensating anion. The main goal of the study was to investigate the influence of the catalysts composition, especially Ni/Cu ratio, on the physical and catalytic properties of these materials. The XRD results show that all the LDHs samples are well crystallized and contain only pure phases. Moreover, the spectral techniques (FT-IR and DR-UV-VIS) indicated that both Ni and Cu species are present in the brucite-like layers of LDHs. The shape of the nitrogen physisorption isotherms obtained at -196 °C indicates a predominantly mesoporous materials; the surface areas and pore volumes are in the specific ranges between 37-86 m2.g-1 and 0.31-0.75 cm3.g-1, respectively. Three characteristic weight losses between 30 and 400 °C are identified by TG analysis for the hydrotalcite-like materials synthesized in this study. Moreover, an influence of the Ni/Cu ratios on the amount of the physisorbed water was noticed. The preliminary catalytic test revealed unusual catalytic properties of the non-calcined samples in the liquid phase hydrogenation of trans-cinnamaldehyde.
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Removal of dimethylsulfoxide from wastewater using mild oxidation with H2O2 over Ti-based catalysts. CHEMOSPHERE 2009; 77:1065-1068. [PMID: 19800653 DOI: 10.1016/j.chemosphere.2009.08.059] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/24/2009] [Revised: 08/28/2009] [Accepted: 08/31/2009] [Indexed: 05/28/2023]
Abstract
The mild catalytic oxidation of dimethylsulfoxide (DMSO) into biodegradable dimethylsulfone is proposed as an efficient pretreatment of wastewaters subjected to biological treatment processes. A SiO(2)-TiO(2) mesoporous xerogel prepared by a non-hydrolytic route, as well as titanium silicalite TS-1 showed very good activity and stability in the catalytic oxidation of DMSO with H(2)O(2) in dilute aqueous solution, at room temperature.
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Modified SBA-15 mesoporous silica for heavy metal ions remediation. CHEMOSPHERE 2008; 73:1499-1504. [PMID: 18760443 DOI: 10.1016/j.chemosphere.2008.07.039] [Citation(s) in RCA: 96] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/16/2008] [Revised: 07/07/2008] [Accepted: 07/16/2008] [Indexed: 05/26/2023]
Abstract
N-Propylsalicylaldimino-functionalized SBA-15 mesoporous silica was prepared, characterized and used as an adsorbent for heavy metal ions. The organic-inorganic hybrid material was obtained using successive grafting procedures of SBA-15 silica with 3-aminopropyl-triethoxysilane and salicylaldehyde, respectively. For comparison an amorphous silica gel was functionalized using the same procedure. The structure and physicochemical properties of the materials were characterized by means of elemental analysis, X-ray diffraction (XRD), nitrogen adsorption-desorption, thermogravimetric analysis and FTIR spectroscopy. The organic functional groups were successfully grafted on the SBA-15 surfaces and the ordering of the support was not affected by the chemical modification. The behavior of the grafted solids for the adsorption of heavy metals ions from aqueous solutions was investigated. The hybrid materials showed high adsorption capacity and high selectivity for copper ions. Other ions, such as nickel, zinc, and cobalt were adsorbed by the modified SBA-15 material. The adsorbent can be regenerated by acid treatment without altering its properties.
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V-, Mo- and W-containing layered double hydroxides as effective catalysts for mild oxidation of thioethers and thiophenes with H2O2. Catal Today 2008. [DOI: 10.1016/j.cattod.2008.04.031] [Citation(s) in RCA: 75] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Ni-MCM-36 and Ni-MCM-22 catalysts for the ethylene oligomerization. ZEOLITES AND RELATED MATERIALS: TRENDS, TARGETS AND CHALLENGES, PROCEEDINGS OF THE 4TH INTERNATIONAL FEZA CONFERENCE 2008. [DOI: 10.1016/s0167-2991(08)80087-0] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
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39
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Non-hydrolytic synthesis of mesoporous silica–titania catalysts for the mild oxidation of sulfur compounds with hydrogen peroxide. Chem Commun (Camb) 2008:5357-9. [DOI: 10.1039/b811668g] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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40
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Catalytic oxidation processes for removing dimethylsulfoxide from wastewater. CHEMOSPHERE 2007; 68:227-33. [PMID: 17320930 DOI: 10.1016/j.chemosphere.2007.01.028] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/24/2006] [Revised: 01/11/2007] [Accepted: 01/13/2007] [Indexed: 05/14/2023]
Abstract
An effective method for removing dimethylsulfoxide (DMSO) from wastewater, based on the mild selective catalytic sulfoxidation with H(2)O(2), is proposed in this study. The catalysts are W-containing layered double hydroxides (LDH), and they were obtained by ionic exchange of the nitrate anions from MAl-LDH precursors (M=Mg(2+) or Zn(2+)) with both WO(4)(2-) and W(7)O(24)(6-) species. Results of X-ray diffraction (XRD), N(2) adsorption, thermal gravimetric analysis (TGA), diffuse reflectance ultraviolet spectroscopy (DRUV) and Raman spectroscopy confirmed the formation of the W-oxospecies inside the interlayer space and the modification of the textural properties upon the exchange process. All catalysts showed very good activity and stability in the DMSO conversion into dimethylsulfone with dilute H(2)O(2) aqueous solution, at low temperatures (20-50 degrees C). The efficiency of the H(2)O(2) was higher than 95% and the behaviour of the water as solvent was very close to that of the organic solvents (ethanol, acetonitrile, 1,4-dioxane).
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Heterogeneous sulfoxidation of thioethers by hydrogen peroxide over layered double hydroxides as catalysts. Catal Today 2001. [DOI: 10.1016/s0920-5861(00)00627-1] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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42
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29-O-02 Towards total hydrophobisation of MCM-41 type silica surface. STUDIES IN SURFACE SCIENCE AND CATALYSIS 2001. [DOI: 10.1016/s0167-2991(01)81330-6] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/10/2023]
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Thioether oxidation by hydrogen peroxide using titanium-containing zeolites as catalysts. ACTA ACUST UNITED AC 1996. [DOI: 10.1016/1381-1169(96)00203-8] [Citation(s) in RCA: 87] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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