Immobilizing Catalysts on Porous Materials

Zhao, Xiaoke; Bao, Xiao Ying; Guo, Wanping; Lee, Fang Yin

doi:10.1002/chin.200622228

Cited by 10 publications

(11 citation statements)

References 1 publication

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“…There are many carriers available for the immobilization of laccase, e.g. the quantity of adsorbed silicon ball material was approximately 500 mg g −1 while that of polyvinyl alcohol‐chitin‐multiwalled carbon nanotube reached a maximum of 907 mg g −1 in previous studies.…”

Section: Resultsmentioning

confidence: 93%

Synthesis and characterization of mesoporous Cu-MOF for laccase immobilization

Zhong

Pang

Wu³

et al. 2017

J. Chem. Technol. Biotechnol

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BACKGROUND Mesoporous metal–organic frameworks (MOFs) have been widely researched for enzyme immobilization, however, most are unstable in the aqueous phase. This paper reports the synthesis of a Cu–MOF for the immobilization of copper contained laccase via a surfactant‐templating method with various surfactant/chelating agent mass ratios. RESULTS The Brunauer–Emmett–Teller (BET) surface area and pore diameter of the nanoscale Cu–MOF were 366–1154 m2 g−1 and 15.2–20.7 nm, respectively. The adsorption concentration and time were optimized to be 5 mg laccase mL−1 and 1 h. This immobilized system exhibited adsorption capacity up to 502 mg g−1 and activity recovery rate of 95.2%. The optimum reaction conditions for immobilizing laccase on Cu–MOF were pH 4 and 50°C. According to the Lineweaver–Burk plot, the Km of the immobilized laccase was 0.157 mmol L−1, indicating that the affinity of immobilized laccase to its substrate was higher than that of free laccase (0.290 mmol L−1). The activity of immobilized laccase after seven iterations of reuse remained approximately 50%. CONCLUSION The mesoporous Cu–MOF showed favorable adsorption capability and can be utilized in laccase immobilization. © 2017 Society of Chemical Industry

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Section: Resultsmentioning

confidence: 93%

Synthesis and characterization of mesoporous Cu-MOF for laccase immobilization

Zhong

Pang

Wu³

et al. 2017

J. Chem. Technol. Biotechnol

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“…But the application of homogeneous catalysts in industrial processes has limited due to their difficult and costly separation and recovery. 12,13 For this reason, in recent years, it is considerable attention to obtain new generation, highly active catalysts by combination the practical advantages of heterogeneous catalysts with the efficiency of a homogeneous catalyst. [14][15][16] In recent years, the synthesis and development of hydrogelpalladium composites as a heterogeneous catalyst have gained much attention due to their properties such as being nontoxic, environmentally friendly, having chemical, thermal stability, and high surface area.…”

Section: Introductionmentioning

confidence: 99%

The kinetics and mechanism of polymer‐based NHC‐Pd‐pyridine catalyzed heterogeneous Suzuki reaction in aqueous media

Boztepe

Künkül

Gürbüz

et al. 2019

Int J of Chemical Kinetics

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One of the most important challenges of the Suzuki reaction is a green synthesis of reaction products. In terms of economy and ecology, the Suzuki reaction details must be characterized for the industrial‐scale Suzuki reaction processes. In this paper, for the first time, a kinetic and mechanistic study on the Suzuki reaction catalyzed with hydrogel‐supported PEPPSI (pyridine‐enhanced precatalyst preparation stabilization (and) initiation) type NHC‐Pd‐pyridine composite has been investigated. To determine the rate‐limiting step, the effects of reactants and experimental conditions on the heterogeneous Suzuki reaction have been experimentally defined. The experimental results demonstrated that it is possible to reach 100% yield under the optimum reaction conditions, which were found as 75 × 10−3 mol/L of phenylboronic acid (FBA), 50 × 10−3 mol/L of bromoacetophenone (Brac), 125 × 10−3 mol/L of K2CO3, 1 g/L of catalyst, 80°C of reaction temperature, 400 rpm of mixing rate, and 3 h of reaction time. The transmetalation step in the cycle was defined as the rate‐limiting step. On the basis of kinetic results, a mathematical reaction rate expression was presented assuming the steady‐state approach to steps of the catalytic cycle. The activation energy (Ea) of the reaction was estimated to be 34.88 kJ/mol.

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“…FSM-16, MCM-41, and SBA-15 are all examples of mesoporous silica based on a uniform hexagonal structure (Fukuoka et al, 2006;Hoffmann et al, 2006). However, the pore sizes of SBA-15 are greater than those of either FSM-16 or MCM-41 and can be controlled within a wider range (6-15 nm) by manipulating the interconnections between mesopores and micropores (Miyazawa and Inagaki, 2000;Zhao et al, 2006). Wang et al (2009) employed SBA-15 and chromium oxide supported on SBA-15 (CrOx/SBA-15) prepared via an incipient wetness impregnation as catalysts for the ODH of isobutane.…”

Section: Introductionmentioning

confidence: 99%

Introduction of a Small Amount of Chromium to Enhance the Catalytic Performance of SBA-15 for the Oxidative Dehydrogenation of Isobutane to Isobutene

Kato

Misu

Shimazu

et al. 2018

J. Chem. Eng. Japan / JCEJ

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Various solid oxide catalysts are active for the oxidative dehydrogenation of propane, but achieve yields of less than 2% when these were used for the oxidative dehydrogenation of isobutane to isobutene. An improved isobutene yield of 8% was obtained in the oxidative dehydrogenation of isobutane by using a folded-sheet mesoporous material (FSM-16) and mesoporous molecular sieve (MCM-41), with or without chromium via impregnation or template-ion exchange methods. Further activity enhancement, however, could not be attained. In the present study, chromium cations were introduced into the framework of SBA-15 using a direct synthesis method by mixing chromium nitrate with tetraethylorthosilicate in an aqueous solution with an initial pH of 1.5 and subsequent hydrothermal treatment. Loading the resultant catalyst, SBA-15, with a small amount of chromium (1.84 wt% Cr-SBA-15) increased the isobutene yield (15.4%) at 723 K, while a previous report showed that chromium oxide supported on SBA-15 (CrOx/SBA-15) prepared via incipient wetness impregnation had a lower isobutene yield (11%) at 813 K. To explain this improvement, the catalysts were characterized using X-ray diffraction, transmission electron microscopy, N 2 adsorption-desorption, and NH 3 temperature-programmed desorption. Cr-SBA-15 was found to have a large specific surface area (1,610 m 2 /g), although the structural and acidic nature of the catalyst was similar to the general properties of other mesoporous silicas. The conversion of Cr 3+ species into Cr 6+ on Cr-SBA-15 with the large specific surface area could affect the improvement of the oxidative dehydrogenation of isobutane to isobutene.

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Immobilizing Catalysts on Porous Materials

Abstract: ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.

Cited by 10 publications

References 1 publication

Synthesis and characterization of mesoporous Cu-MOF for laccase immobilization

Synthesis and characterization of mesoporous Cu-MOF for laccase immobilization

The kinetics and mechanism of polymer‐based NHC‐Pd‐pyridine catalyzed heterogeneous Suzuki reaction in aqueous media

Introduction of a Small Amount of Chromium to Enhance the Catalytic Performance of SBA-15 for the Oxidative Dehydrogenation of Isobutane to Isobutene

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