TS-1 zeolite microengineered reactors for 1-pentene epoxidation

Wan, Yu; Chau, Joseph Lik Hang; Gavriilidis, Asterios; Yeung, King Lun

doi:10.1039/b108356b

Cited by 75 publications

(33 citation statements)

References 8 publications

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“…In addition, new possibilities exist for the directed assembly and growth of complex and functional materials beyond films for separations, such as molecular sensors, mechanically stable dielectrics, and novel reaction-diffusion devices. [231][232][233][234] …”

Section: Discussionmentioning

confidence: 99%

Hierarchical Nanomanufacturing: From Shaped Zeolite Nanoparticles to High‐Performance Separation Membranes

2007

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Despite more than a decade of intense research on the high-resolution selectivity of thin zeolite films as alternatives to energy-intensive industrial separations, membranes consisting of intergrown, oriented zeolite crystals have fallen short of gaining wide commercial application. Factors including poor performance, high cost, and difficulties in scale up have contributed to this, and have also stunted their application in other niche markets. Until recently, rational design of these materials was limited because of the elusive mechanism of zeolite growth, and forced more empirical approaches. New understanding of zeolite growth along with recent advances in the molecular engineering of crystal microstructure and morphology, assembly of crystal monolayers, and synthesis of ordered films constitute a strong foundation for meeting stringent industrial demands in the future. Together with new processing capabilities, such a foundation should make it possible to synthesize commercially viable zeolite membranes through hierarchical approaches. Such advances open exciting prospects beyond the realm of separations for assembly of novel and complex functional materials including molecular sensors, mechanically stable dielectrics, and novel reaction-diffusion devices.

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Section: Discussionmentioning

confidence: 99%

Hierarchical Nanomanufacturing: From Shaped Zeolite Nanoparticles to High‐Performance Separation Membranes

2007

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“…Gavriilidis et al used hydrogen peroxide as an oxidant to facilitate epoxidation of 1-pentene in a microchannel coated with titanium silicalite-1 zeolite (TS-1, Scheme 27). 249,250 Reaction rates increased with increasing amounts of Ti in the zeolite framework. It was also observed that the crystal size largely affected the reaction rate.…”

Section: Oxidation Processes In Flow By Means Of Hydrogen Peroxidementioning

confidence: 99%

“…Epoxidation of 1-pentene with H2O2 in a TS-1 immobilized microreactor. 249 Epoxidized soybean oil (ESO) is an important chemical intermediate, which can be used as plasticizer in polyvinyl chloride plastics and stabilizer for plastics. 251 Kinetic modelling of soybean oil epoxidation at elevated temperatures in a microreactor demonstrated that this would lead to much shorter reaction times.…”

Section: Oxidation Processes In Flow By Means Of Hydrogen Peroxidementioning

confidence: 99%

Liquid phase oxidation chemistry in continuous-flow microreactors

et al. 2016

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Continuous-flow liquid phase oxidation chemistry in microreactors receives a lot of attention as the reactor provides enhanced heat and mass transfer characteristics, safe use of hazardous oxidants, high interfacial areas, and scale-up potential. In this review, an up-to-date overview of both technological and chemical aspects of liquid phase oxidation chemistry in continuous-flow microreactors is given. A description of mass and heat transfer phenomena is provided and fundamental principles are deduced which can be used to make a judicious choice for a suitable reactor. In addition, the safety aspects of continuous-flow technology are discussed. Next, oxidation chemistry in flow is discussed, including the use of oxygen, hydrogen peroxide, ozone and other oxidants in flow. Finally, the scale-up potential for continuous-flow reactors is described.

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“…[16] Obviously, the availability of highly oriented TS-1 films, especially along the b-axis, will trigger their application in innovative materials, microreactors, and even microelectronic devices. [17][18][19] TS-1 zeolite has the same tetrahedral framework as Al-ZSM-5 and silicalite-1 MFI zeolites. However, the introduction of Ti atoms into the framework requires a substantially longer hydrothermal reaction time.…”

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confidence: 99%

Synthesis of b‐Oriented TS‐1 Films on Chitosan‐Modified α‐Al₂O₃ Substrates

et al. 2006

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Zeolite films have attracted much attention from the scientific community because of their potential applications as selective membranes, chemical sensors, and microelectronic devices. [1][2][3] The performance of permeable films can be greatly improved by controlling the crystal orientation on the substrate surface. [4,5] Thus far, significant progress in directing the crystal orientation on the substrate surface has been made for LTA and UTD-1, especially for MFI-type zeolite films.[6]Wang and Yan reported a highly b-oriented pure silica MFI film on porous stainless steel synthesized by in situ crystallization. [7] They could manipulate the crystal orientation by using an in situ hydrothermal reaction method, and control over the orientation on the substrate surface was achieved by simply changing the composition of the synthesis solution. By using the seeded growth method, Tsapatsis and co-workers successfully created b-oriented siliceous zeolite ZSM-5 membranes with molecular recognition ability on porous alumina substrates. [8,9] Highly selective and permeable membranes were obtained based on a good understanding of both crystal growth and interaction between crystal grains and the substrate surface.[5] The separation factor of para-to ortho-xylene isomers could be up to several hundred while keeping the permeance of para-xylene high. Based on induction by surface matrices, Yoon and co-workers could pack silicalite-1 crystals of a uniform size over a glass surface in a desired orientation.[10]Compared with Al-ZSM-5 and silicalite-1, TS-1 zeolite possesses a variety of special features. In addition to the molecular sieving effect, TS-1 films catalyze oxidative reactions as well, including selective oxidation of alcohols, [11] epoxidation of alkenes, [12] hydroxylation of aromatics, [13] oxyfunctionalization of n-hexane to hexanols and hexanones, [14,15] and photocatalytic oxidation. [16] Obviously, the availability of highly oriented TS-1 films, especially along the b-axis, will trigger their application in innovative materials, microreactors, and even microelectronic devices. [17][18][19] TS-1 zeolite has the same tetrahedral framework as Al-ZSM-5 and silicalite-1 MFI zeolites. However, the introduction of Ti atoms into the framework requires a substantially longer hydrothermal reaction time. Several research groups have synthesized TS-1 monoliths, [20,21] films, [6,22,23] and membranes. [16,24] However, all the TS-1 films and membranes reported are randomly oriented, except in the work of Lee et al. who used poly(ethylene oxide) (PEO) as a template to direct the oriented growth of TS-1 films on glass.[6] To date, we have found no published work on the synthesis of b-oriented TS-1 films on porous substrates. Here, we report a new synthesis strategy for manufacturing b-oriented TS-1 films on porous a-Al 2 O 3 substrates. Chitosan will serve as the structure-directing matrix to induce the orientation of the crystal grains with the b-axes perpendicular to the substrate surface. Finally, the performance of the s...

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TS-1 zeolite microengineered reactors for 1-pentene epoxidation

Abstract: A zeolite-based microengineered reactor was fabricated and tested for 1-pentene epoxidation over titanium silicalite-1 (TS-1) catalyst, which has been selectively incorporated within the microreactor channel using a new synthesis procedure.

Cited by 75 publications

References 8 publications

Hierarchical Nanomanufacturing: From Shaped Zeolite Nanoparticles to High‐Performance Separation Membranes

Hierarchical Nanomanufacturing: From Shaped Zeolite Nanoparticles to High‐Performance Separation Membranes

Liquid phase oxidation chemistry in continuous-flow microreactors

Synthesis of b‐Oriented TS‐1 Films on Chitosan‐Modified α‐Al₂O₃ Substrates

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TS-1 zeolite microengineered reactors for 1-pentene epoxidation

Abstract: A zeolite-based microengineered reactor was fabricated and tested for 1-pentene epoxidation over titanium silicalite-1 (TS-1) catalyst, which has been selectively incorporated within the microreactor channel using a new synthesis procedure.

Cited by 75 publications

References 8 publications

Hierarchical Nanomanufacturing: From Shaped Zeolite Nanoparticles to High‐Performance Separation Membranes

Hierarchical Nanomanufacturing: From Shaped Zeolite Nanoparticles to High‐Performance Separation Membranes

Liquid phase oxidation chemistry in continuous-flow microreactors

Synthesis of b‐Oriented TS‐1 Films on Chitosan‐Modified α‐Al2O3 Substrates

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Product

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Synthesis of b‐Oriented TS‐1 Films on Chitosan‐Modified α‐Al₂O₃ Substrates