Catalytic cracking of light naphtha over hierarchical ZSM-5 using rice husk ash as silica source in presence of ultrasound energy: Effect of carbon nanotube content

Khoshbin, Reza; Oruji, Shima; Karimzadeh, Ramin

doi:10.1016/j.apt.2018.06.001

Cited by 24 publications

(9 citation statements)

References 62 publications

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“…It has been well documented that the utilization of ultrasound irradiation is a desirable technique for catalyst synthesis [48,49]. Dissolution, nucleation and growth of crystals can be changed by acoustic cavitation which was driven from ultrasonic power.…”

Section: Introductionmentioning

confidence: 99%

WITHDRAWN: Fabrication of Nimo Nanostructured Catalyst via Ultrasonic-Assisted Combustion Method Used in High Efficiency Thiophene Hydrodesulfurization: Influence of Organic Compound Type

Hamidi¹,

Khoshbin²,

Karimzadeh³

2020

Preprint

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Alumina supported NiMo nanocatalysts were synthesized through ultrasonic-assisted combustion method with various organic additives, including citric acid, ethylene glycol, glycine and urea using in hydrodesulfurization of thiophene at atmospheric pressure. The samples were characterized by XRD, TGA, FESEM, EDX, BET-BJH and TPR analyses. The results indicated that the type of organic compound has a noticeable effect on phase structure, surface morphology and reducibility potential as a consequence of different amount of heat and gaseous products released during combustion reaction. Our method showed that a relatively homogeneous distribution of the active material over the support can be achieved. Using citric acid as an organic additive, led to synthesis of nanocatalyst in which more than 90% of particles are less than 70 nm. The sample synthesized by citric acid exhibited the highest activity in hydrodesulfurization reaction due to its significant properties such as high surface area, considerable surface hole and weakened metal-support interaction compared with other organic additives. In addition, activity assessment of the prepared catalyst by ethylene glycol and glycine demonstrated that 100% abatement of thiophene can be achieved at 105 °C and 30 min.

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Section: Introductionmentioning

confidence: 99%

WITHDRAWN: Fabrication of Nimo Nanostructured Catalyst via Ultrasonic-Assisted Combustion Method Used in High Efficiency Thiophene Hydrodesulfurization: Influence of Organic Compound Type

Hamidi¹,

Khoshbin²,

Karimzadeh³

2020

Preprint

Self Cite

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“…Among these, silica source plays an important role in the synthesis process and also determines the morphology of the synthesized product [31]. Different silica are used as silica sources during the synthesis process of zeolite [32][33][34]. The effect of silica sources (natural silica nanoparticles derived from rice husk and commercial Ludox) on zeolite of NaY synthesis was been studied by Najat and coworkers [35].…”

Section: Introductionmentioning

confidence: 99%

A Comparative Study of MFI Zeolite Derived from Different Silica Sources: Synthesis, Characterization and Catalytic Performance

Zhang

Liu

et al. 2018

Catalysts

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In this paper, a comparative study of MFI zeolite derived from different silica sources is presented. Dry gel conversion (DGC) method is used to synthesize silicalite-1 and ZSM-5 with MFI structure. Two kinds of silica sources with different particle sizes are used during the synthesis of MFI zeolite. The as-prepared samples were characterized by X-ray diffraction (XRD), N2-sorption, Fourier transform infrared spectroscopy (FTIR), Scanning electron microscopy (SEM) and X-ray fluorescence spectrometer (XRF). From the characterization results, it could be seen that the high-quality coffin-like silicalite-1 was synthesized using silica sphere with particle size of 300 nm as silica source, with crystallization time being shortened to 2 h. The schematic diagram of silicalite-1 formation using silica sources with different particle sizes is summarized. ZSM-5 was obtained by adding Al atoms to raw materials during the synthesis of MFI zeolite. The performance of aqueous phase eugenol hydrodeoxygenation over Pd/C-ZSM-5 catalyst is evaluated.

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“…Soon, the same synthesis strategies were applied to a wide range of zeolite structures, as can be seen in Table 2. However, as some carbon black had a wide range of particle size, leading to randomly oriented or cavern-like mesopores, other carbon materials soon emerged as possible templates, such as, carbon nanotubes [34] or nanofibers [31], as well as the application of other materials such as polymers [43], or even more creative biological materials, such as starch [40], wood cells [41], or even leaves and stems of plants [42]. The use of these materials as templates brings the advantage of being abundant and relatively inexpensive, as well as offering a great diversity of shapes and sizes.…”

Section: Hard Templatingmentioning

confidence: 99%

Zeolites and Related Materials as Catalyst Supports for Hydrocarbon Oxidation Reactions

et al. 2022

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Catalytic oxidation is a key technology for the conversion of petroleum-based feedstocks into useful chemicals (e.g., adipic acid, caprolactam, glycols, acrylates, and vinyl acetate) since this chemical transformation is always involved in synthesis processes. Millions of tons of these compounds are annually produced worldwide and find applications in all areas of chemical industries, ranging from pharmaceutical to large-scale commodities. The traditional industrial methods to produce large amounts of those compounds involve over-stoichiometric quantities of toxic inorganic reactants and homogeneous catalysts that operate at high temperature, originating large amounts of effluents, often leading to expensive downstream processes, along with nonrecovery of valuable catalysts that are loss within the reactant effluent. Due to the increasingly stringent environmental legislation nowadays, there is considerable pressure to replace these antiquate technologies, focusing on heterogeneous catalysts that can operate under mild reactions conditions, easily recovered, and reused. Parallelly, recent advances in the synthesis and characterization of metal complexes and metal clusters on support surfaces have brought new insights to catalysis and highlight ways to systematic catalysts design. This review aims to provide a comprehensive bibliographic examination over the last 10 years on the development of heterogeneous catalysts, i.e., organometallic complexes or metal clusters immobilized in distinct inorganic supports such as zeolites, hierarchical zeolites, silicas, and clays. The methodologies used to prepare and/or modify the supports are critically reviewed, as well as the methods used for the immobilization of the active species. The applications of the heterogenized catalysts are presented, and some case-studies are discussed in detail.

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Catalytic cracking of light naphtha over hierarchical ZSM-5 using rice husk ash as silica source in presence of ultrasound energy: Effect of carbon nanotube content

Cited by 24 publications

References 62 publications

WITHDRAWN: Fabrication of Nimo Nanostructured Catalyst via Ultrasonic-Assisted Combustion Method Used in High Efficiency Thiophene Hydrodesulfurization: Influence of Organic Compound Type

WITHDRAWN: Fabrication of Nimo Nanostructured Catalyst via Ultrasonic-Assisted Combustion Method Used in High Efficiency Thiophene Hydrodesulfurization: Influence of Organic Compound Type

A Comparative Study of MFI Zeolite Derived from Different Silica Sources: Synthesis, Characterization and Catalytic Performance

Zeolites and Related Materials as Catalyst Supports for Hydrocarbon Oxidation Reactions

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