Highly hydrophobic zeolite ZSM-8 with perfect framework …
The powder XRD patterns (Fig. 1 a) of the crystals obtained in the pH range of 2.8–4.8 with TEA + as the SDA show that the 4 samples belong to the same phase that was named ZSM-8.ZSM-8 was prepared in high-silica and pure-silica versions in the presence of TEA + [29, 37, 38].The patterns are also similar to the ones of MFI-type silicalite-1 crystallized …
Adsorption of carbon monoxide on Ag (I)-ZSM-5 zeolite: An
1. Introduction. The interaction of carbon monoxide with ZSM-5 zeolite exchanged with Ag + cations [Ag(I)-ZSM-5] is an important step for different heterogeneous catalytic processes. It is essential for the synthesis of methanol from H 2 and CO, and for the low-temperature water–gas shift reaction. It is also of interest in the automotive …
Synthesis and evaluation of mesopore structured ZSM-5 …
A modified ZSM-5 zeolite (denoted as ZSM-5-M), which was synthesized using tetrapropylammonium hydroxide (TPAOH) and cetyltrimethylammonium bromide (CTAB) as dual templates, and the commercial ZSM-5 zeolite (denoted as ZSM-5-C), have been used to prepare the corresponding CuZSM-5 (M & C) catalysts containing 3 wt% Cu by ion …
Synthesis, characterization, and catalytic …
Thus, many methods, like the preparation of nano-sized ZSM-5 12–15 as well as hierarchical ZSM-5, 16–18 have been applied for the promotion of the diffusion property to enhance the catalyst stability of …
One-Step Synthesis of Hierarchical ZSM-5 Using …
Hierarchical ZSM-5 zeolite is hydrothermally synthesized in a single step with cetyltrimethylammonium (CTA) hydroxide acting as mesoporogen and structure-directing …
Lanthanum modified Fe-ZSM-5 zeolites for selective methane oxidation
Selective partial oxidation of methane to methanol under ambient conditions is a great challenge in chemistry. Iron modified ZSM-5 catalysts are shown to be effective for this reaction using H 2 O 2 as the oxidant. However, the high consumption of H 2 O 2 over this catalyst presents a major disadvantage. Here we report a lanthanum modified Fe-ZSM-5 …
Preparation of ZSM-5 molecular sieve modified by kaolin …
The ZSM-5 molecular sieve was prepared by the crystal species-assisted hydrothermal synthesis method using kaolin as raw material, and the molecular sieve were prepared by monometallic Na, Ni and bimetallic Ni–Na modification of the molecular sieve when using the isovolumetric impregnation method. It was found that the modified …
RU1836143C
A crystalline aluminosilicate having its anhydrous state a formula expressed in terms of mol ratios as follows: xQ:0.01 - 0.1 M2/nO:0-0.08 Z2O3:SiO2:0.0001 - 0.5 MeS, wherein: Q is an organic nitrogen compound; Z is aluminium, boron, gallium or mixtures thereof; x is between 0 and 0.5; M is at least one metal cation of valance n; and Me is at least one of the …
Influence of the calcination treatment on the …
The effect of the calcination treatment on the zeolite physicochemical properties and its catalytic performance is studied on this work. Two different ZSM-5 …
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Synthesis of tetramethylbenzene from CO2 hydrogenation over ZnZrO/ZSM
The ZnZrO/ZSM-11 tandem catalyst consists of two components, the ZnZrO catalyst and ZSM-11 zeolite. Fig. 2 shows the representative results of a series of tandem catalysts for CO 2 hydrogenation. Fig. 2 A and 2 B shows that the ZnZrO/ZSM-11 tandem catalyst significantly increases the selectivity of the single aromatic product TeMB from …
Quantitatively regulating ZSM-48 by phenolic molecules for
ZSM-48 is widely used to support Pt nanoparticles (Pt/ZSM-48) for hydroisomerization of long-chain n-paraffin due to its 10-member-ring one-dimensional pore structure.But the yield of target isomers on Pt/ZSM-48 is difficult to be improved due to easily bundled crystal bars and relatively excessive acid sites of ZSM-48, which restricts …
Bimetallic Fe-Mn loaded H-ZSM-5 zeolites for excellent …
H-ZSM-5 (proton form Zeolite Socony Mobil-5) has been extensively investigated for the removal of VOCs owing to its advantages as follows: (1) Zeolites contain ample acidic sites and possess certain catalytic activities, high thermostability, and adjustable hydrophobicity; thus, it is an excellent candidate substrate material [5]. (2) …
Towards the preparation of binderless ZSM-5 zeolite …
In the present work, two types of binderless zeolites were prepared by the alkali post-treatment using a defective ZSM-5 zeolite as the starting material, namely monolithic binderless ZSM-5 zeolites dominated by micropores and hierarchical monolithic binderless ZSM-5 zeolites. It has been found that the silica binder can be converted into the ...
Thermal stability and siting of aluminum in isostructural ZSM-22 …
The results of SEM analysis are given in Fig. 2.ZSM-22 and Theta-1 samples exhibit significantly different morphology and crystal size. ZSM-22 forms rice-like crystals up to 16. μm in length and 5 μm in width, but Theta-1 forms aggregates of very fine (1 × 0.2 μm) randomly oriented crystals.. SEM data confirm high crystallinity of ZSM-22 …
Preparation and high CO2/CH4 selectivity of ZSM-5/Ethyl …
ZSM-5 of various qualities (contents: 1%, 18.2 mg; 3%, 55.7 mg; 5%, 94.7 mg; 8%, 156.5 mg; 10%, 200.0 mg) was dispersed into THF by ultrasonic vibration-assisted for 1 h, and then it was added the ethyl cellulose solution, followed under high speed and ultrasonic vibration-assisted for 2 h to get a uniformly mixed casting solution. The ...
Bread-template synthesis of hierarchical mesoporous ZSM …
The thermogravimetric (TG) and differential thermal analysis curves of as-synthesized hierarchical mesoporous ZSM-5, bread-template, and conventional ZSM-5 were compared in Fig. 4.In TG and DTA curves, conventional ZSM-5 zeolite synthesized in the absence of bread showed a weight loss of 13.6% and two obvious peaks at 470 °C and …
A convenient synthesis of core–shell ZSM-5@ZnO catalysts …
A novel core–shell ZSM-5@ZnO was successfully fabricated through a hydrothermal coating strategy, and the catalytic performance of ZSM-5@ZnO in the methane co-aromatization with propane (MCP) reaction was investigated using a physically-blended ZSM-5/ZnO catalyst as a comparison. Multi-techniques including X
ZSM-5 Catalysts for MTO: Effect and Optimization of …
ZSM-5 Catalysts for MTO: Effect and Optimization of the Tetrapropylammonium Hydroxide Concentration on Synthesis and Performance Mohammed A. Sanhoob Interdisciplinary …
Enhanced hydrophobic ZSM–5 with high capacity for
The ZSM–5 molecular (Song et al., 2004) sieve has a pore size close to the molecular dynamics diameter of toluene, and the sieve has two types of channels—A zigzag channel with an oval section 0.51 × 0.55 nm and a 0.53 × 0.56 nm straight channel with a cross section close to a circle. When the adsorbate molecules are close to the ...
The universal zeolite ZSM-5: Structure and synthesis …
The micro-scale ZSM-5 was created in a single step using ZSM-5 seeds with a uniform and regular pupal shape and a particle size of 5 × 3 μm, according to the analysis techniques used. The zeolite with a mesoporous texture was obtained at the submicron and nanometer scales via Silicate-1 seeds using the single-step crystallization method and ...
Rapid hydrothermal synthesis of hierarchical ZSM …
An innovative hydrothermal method has been successfully applied to the synthesis of hierarchical ZSM-5/beta composite zeolites with different mass ratios. Firstly, the ZSM-5 …
Synthesis and characterization of MCM-49/ZSM-35
Template plays an important role during the zeolite synthesis process, especially in the mixed amine system [2], [6].CHA has been known as an effective SDA to synthesize ZSM-35 zeolite [16], while HMI can contribute to the formation of MCM-22 and MCM-49 zeolite even to ZSM-35 zeolite [19].In order to find the role of HMI and CHA in …
The synthesis of endurable B–Al–ZSM-5 catalysts
A series of boron isomorphously framework-substituted ZSM-5 (B x –Al–ZSM-5, Si/Al = 200, B/Al = X) were synthesized and used to selectively transform methanol to propylene (MTP). The catalytic stability can be significantly influenced by B incorporation. In comparison with the conventional ZSM-5, the B 1 –Al–ZSM-5 catalyst afforded a 7-time …
One-step synthesis of hierarchical [B]-ZSM-5 using
Conventional B-ZSM-5 exhibited a typical type-I isotherm according to IUPAC classification, reflecting traditional zeolite having only micropores. However, B1-ZSM-5 …
Catalytic pyrolysis of lignin over ZSM-5, alkali, and metal …
ZSM-5 (5 g) was thoroughly mixed with NaOH (250 mL), and the mire formed was heated for 2 h at 70 °C to achieve a 0.4 M NaOH concentration of ZSM-5. The filtered cooled mire was washed using deionized water and dried at 110 °C for 12 h. The treated ZSM-5 with NaOH solution was ion-exchanged three times with 1 M of NH 4 Cl at 80 °C. …
Boosting the turnover number of core–shell Al-ZSM-5@B-ZSM …
Herein, a specific core–shell MFI zeolite was designed for the methanol to propylene (MTP) reaction. The core–shell structure of Al-ZSM-5@B-ZSM-5 and Al-ZSM-5@silicalite-1 were easily obtained via a two-step procedure, in which Al-ZSM-5 aggregate acted as the core and B-ZSM-5 or silicalite-1 as the shell. Their core–shell structures, acidity distribution …
Optimization of hierarchical ZSM-5 structure from kaolin as …
Optimization of hierarchical ZSM-5 structure by variation of the first hydrothermal step at different times provides insight into the evolution of micro/mesopores and its effect as a catalyst for deoxygenation reaction. The degree of tetrapropylammonium hydroxide (TPAOH) incorporation as an MFI structure directing
Synthesis of ZSM-5 zeolite from fly ash and its adsorption of …
The adsorption capacity of ZSM-5 zeolite for phenol, quinoline and indoles can be up to 24.41 mg g −1, 35.99 mg l −1 and 34.05 mg g −1 respectively, and the removal rates can reach up to 82.80%, 84.86% and 83.20% respectively. The optimal pH value for adsorption ranges from 5 to 7.
Synthesis and characterization of PEG/ZSM-5 composite …
ZSM-5 is regard as one of the excellent mesoporous materials [24], which can be used the carrier matrix to absorb PEG by interfacial tension and capillary force. At the same time, ZSM-5 can also provide thermal transfer pathways for PEG, which improve the thermal conductivity. Thus, ZSM-5 is an ideally supporting material to overcome the ...
Depolymerization of Protobind lignin to produce
Lignin depolymerization reaction was performed over both without catalyst (blank reaction) and ZSM-5 supported catalysts in supercritical ethanol at 440 °C for 5 h.The total yield of monoaromatic compounds is acquired by adding up the each yield of 12 monoaromatic compounds including phenol, toluene, m-xylene, benzyl alcohol, 2 …
Synthesis of hierarchical ZSM-5 by silanization and …
Fig. 1 A and Billustrates the XRD patterns and FTIR spectra respectively, of the samples prepared under the presence of different alcohols, as well as those corresponding to two reference ZSM-5 samples: a nanocrystalline ZSM-5 (n-ZSM-5) and a hierarchical ZSM-5 prepared by the seed silanization recipe but without any alcohol …
Organotemplate-free synthesis of Al-rich ZSM-35 and ZSM …
The key to success is that the targeted ZSM-35 and ZSM-22 zeolite products have partly the same composite building units as the ZSM-57 zeolite seeds. The obtained Al-rich S-ZSM-35 and S-ZSM-22 zeolites show good crystallinity, typical crystal morphology, large BET surface area, and fully 4-coordinated aluminum species.
Rapid solvent-free synthesis of nano-sized ZSM-5 with a low …
Nano-sized ZSM-5 zeolites with wide framework Si/Al ratios are highly desired in the petrochemical and other fields, whereas their synthesis suffers from cost, efficiency and environmental issues. Herein, a new protocol is proposed for the rapid synthesis of ZSM-5 with a low Si/Al ratio at a low temperature.
Thiolation behaviors of methanol catalyzed by bifunctional ZSM …
The catalytic properties of bifunctional ZSM-5@t-ZrO 2 catalyst for methanol thiolation were revealed by using methanol and H 2 S as probe molecules. Taking the ZSM-5/t-ZrO 2 physically-blended catalyst, pure ZSM-5 and t-ZrO 2 as control catalysts, we investigated the characteristics of adsorption and transformation of different reaction …