Hierarchical Zeolites and their Catalytic Performance in Selective Oxidative Processes

Ojeda, Manuel; Grau-Atienza, Aida; Campos, Rafael Cândido; Romero, Antonio A.; Serrano, Elena; Marinas, J. M.; Martı́nez, Javier; Luque, Rafael

doi:10.1002/cssc.201500124

Cited by 21 publications

(8 citation statements)

References 56 publications

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“…The catalytic performance of the hybrid materials was evaluated in terms of products yield, turnover number (TON) or frequency (TOF, h −1 ), and selectivity to acetophenone. The results in Table 4 and Figure 4 show that the parent and treated zeolites present some catalytic activity, in line to what was previously reported in the literature [9,10]. The catalytic activity of the pristine support in the MW-assisted oxidation of 1-phenylethanol revealed an acetophenone yield of 9%, which is kept almost constant upon zeolite treatments.…”

Section: Catalystsupporting

confidence: 89%

“…Desilicated zeolites have been used as supports for metal complexes immobilization [8] and metals [9,10] for diverse reactions, involving most of the times a conventional immobilization method of the metal salt in solution. Some recent studies have reported the mechanochemical preparation of iron-immobilized species onto desilicated ZSM-5 zeolites and their application in selective microwave-assisted oxidation reactions [9,10].…”

Section: Introductionmentioning

confidence: 99%

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Fe@Hierarchical BEA Zeolite Catalyst for MW-Assisted Alcohol Oxidation Reaction: A Greener Approach

et al. 2020

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The aim of this study was to investigate the catalytic activity of hybrid materials of iron supported on hierarchical zeolites in the oxidation reaction of 1-phenylethanol to acetophenone. A greener approach was considered for the preparation of the catalyst and performance of the oxidation reaction. Hierarchical BEA zeolite samples were obtained from an alkaline and a subsequent acid treatment. The materials were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM) and nitrogen adsorption at −196 °C. An iron salt was incorporated onto the hierarchical zeolites by mechanochemical grinding and the catalytic performance of the prepared materials was evaluated towards the microwave assisted oxidation reaction of 1-phenylethanol. The catalyst obtained by Fe immobilization on sample modified by 0.2 M NaOH followed by acid treatment (Fe@BEA0.2AT) is the most promising material with 35% yield and 56% selectivity to acetophenone, allowing five reuse cycles without significant loss of activity and selectivity.

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Section: Catalystsupporting

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Fe@Hierarchical BEA Zeolite Catalyst for MW-Assisted Alcohol Oxidation Reaction: A Greener Approach

et al. 2020

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“…[1][2][3][4][5] To overcome the pore size limitation of zeolites, hierarchically porous zeolites comprising mesopore (2~50 nm) and/or macropore (>50 nm) have attracted growing interest. [10][11][12] Up to now, various strategies have been developed for the preparation of hierarchically micro-mesoporous and micro-macroporous aluminosilicate zeolites, such as soft template route, [13][14][15][16] hard template route, 17,18 and post-treatment route. Meanwhile, hierarchically porous zeolites can also reduce the rate of forming coke deposition and increase the catalyst lifetime due to the easier mass transport over the large pore volume of meso and/or macroporous systems compared to the purely microporous system.…”

Section: Introductionmentioning

confidence: 99%

“…Meanwhile, hierarchically porous zeolites can also reduce the rate of formation of coke deposition and increase the catalyst lifetime due to the easier mass transport over the large pore volume of meso and/or macroporous systems compared to the purely microporous system. [10][11][12] Until now, various strategies have been developed for the preparation of hierarchically micro-mesoporous and micro-macroporous aluminosilicate zeolites, such as the so template route, [13][14][15][16] hard template route, 17,18 and post-treatment route. 19,20 The synthesis of tri-level hierarchical industrially important zeolites with superior catalytic performance is of great challenge.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of tri-level hierarchical SAPO-34 zeolite with intracrystalline micro–meso–macroporosity showing superior MTO performance

et al. 2015

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‡ These authors contributed equally. Electronic Supplementary Information (ESI) available: [TG curves and the detailed MTO results over SAPO-34 catalysts, etc. are provided in the supporting information.]. SeeHierarchically porous zeolites with different level of porosity have emerged as an important class of materials because of their enhanced mass transport and improved catalytic performance. Silicoaluminophosphate zeolite SAPO-34 is one of the best catalysts for methanol-to-olefin (MTO) conversion, but suffers from rapid deactivation due to the narrow 8-ring pore openings. To overcome the inherent diffusion bottleneck and improve the MTO performance, in this work, tri-level hierarchically porous SAPO-34 zeolite with intracrystalline micro-meso-macroporosity has been first synthesized by an Alrich method coupled with the use of polyethylene glycol 2000 polymer under hydrothermal conditions. The as-synthesized hierarchically porous SAPO-34 catalysts exhibit superior catalytic performance in MTO reaction with about six-times prolonged catalytic lifetime and nearly 5% improvement of selectivity for ethylene and propylene than the conventional microporous SAPO-34.Tri-level hierarchically porous SAPO-34 zeolite with intracrystalline micro-meso-macropore structure has been synthesized exhibiting remarkably enhanced performance in methanol-to-olefin reaction.

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“…To face this drawback, quite a few approaches have been endeavored towards accessibility and mass transfer enhancement for these materials [70,71]. These methods aim for the development of hierarchical zeolites, presenting micro and mesoporosity, which efficiently combine the inherent zeolites properties with mesoporosity.…”

Section: Pdnps@zeolitesmentioning

confidence: 99%

Supported Palladium Nanocatalysts: Recent Findings in Hydrogenation Reactions

Andrade¹,

Martins²

2020

Processes

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Catalysis has witnessed a dramatic increase on the use of metallic nanoparticles in the last decade, opening endless opportunities in a wide range of research areas. As one of the most investigated catalysts in organic synthesis, palladium finds numerous applications being of significant relevance in industrial hydrogenation reactions. The immobilization of Pd nanoparticles in porous solid supports offers great advantages in heterogeneous catalysis, allowing control of the major factors that influence activity and selectivity. The present review deals with recent developments in the preparation and applications of immobilized Pd nanoparticles on solid supports as catalysts for hydrogenation reactions, aiming to give an insight on the key factors that contribute to enhanced activity and selectivity. The application of mesoporous silicas, carbonaceous materials, zeolites, and metal organic frameworks (MOFs) as supports for palladium nanoparticles is addressed.

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Hierarchical Zeolites and their Catalytic Performance in Selective Oxidative Processes

Cited by 21 publications

References 56 publications

Fe@Hierarchical BEA Zeolite Catalyst for MW-Assisted Alcohol Oxidation Reaction: A Greener Approach

Fe@Hierarchical BEA Zeolite Catalyst for MW-Assisted Alcohol Oxidation Reaction: A Greener Approach

Synthesis of tri-level hierarchical SAPO-34 zeolite with intracrystalline micro–meso–macroporosity showing superior MTO performance

Supported Palladium Nanocatalysts: Recent Findings in Hydrogenation Reactions

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