Vapor‐Phase Reaction of Citronellal over Mesoporous Molecular Sieves MCM‐41 and Zeolites

Shieh, Dong‐Lin; Tsai, Chia‐Chun; Chen, Chih‐Wei; Ko, An-Nan

doi:10.1002/jccs.200300119

Cited by 8 publications

(8 citation statements)

References 41 publications

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“…The previous studies revealed that the catalytic results depend on several parameters such as acidity, pore size, and pore channel structure of catalysts. 2,3,[8][9][10]13,16,17,19,20 Stereoselectivity of ca. 60−80% to (−)-isopulegol was obtained, with the rest comprising racemates and byproducts, namely, of isopulegol dehydration.…”

Section: Introductionmentioning

confidence: 99%

Effect of Binders on the Physicochemical and Catalytic Properties of Extrudate-Shaped Beta Zeolite Catalysts for Cyclization of Citronellal

Vajglová

Kumar

Mäki‐Arvela

et al. 2019

Org. Process Res. Dev.

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Citronellal cyclization was carried out in a continuous mode over H-beta-25 zeolite-based extrudates in a trickle-bed reactor at 35 °C and 10 bar of Ar. The physicochemical properties of zeolitic catalysts in the form of extrudates with a different diameter (1.4–3 mm) containing 30 wt % of a binder were correlated with the catalytic results. Alumina, aluminosilicate clay, and colloidal silica were used as binders. For extrudates with 1.4 mm in diameter, a significant decrease in the surface area, pore volume, and the total number of acid sites was observed in comparison to the values expected from a simple mechanical mixture of constituents. The specific surface area was similar, while the pore volume and mechanical strength decreased with increasing extrudate diameter. For all catalysts, conversion of citronellal and the yield of the desired pulegols decreased because of lower acidity and more prominent mass transfer with a size increase, while the selectivity ratio for different pulegols was similar. Overall, the effect of mass transfer on catalytic results in citronellal cyclization was larger than the effect of acidity. The yield of pulegols and the ratio of isopulegol ethers were correlated with strong Brønsted and strong Lewis acid sites, respectively. A proper selection of the binder and diameter of the extrudates plays a crucial role in the cyclization of citronellal.

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Section: Introductionmentioning

confidence: 99%

Effect of Binders on the Physicochemical and Catalytic Properties of Extrudate-Shaped Beta Zeolite Catalysts for Cyclization of Citronellal

Vajglová

Kumar

Mäki‐Arvela

et al. 2019

Org. Process Res. Dev.

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“…[1][2][3] Since M41S mesoporous molecular sieves were first reported by the Mobil group in 1992, 4,5 the synthesis, characterization and potential applications for adsorption, separation and catalysis of mesoporous materials have been widely investigated. 3 MCM-41 exhibits a highly ordered hexagonal array of one-dimensional mesopores, whose diameters can be varied from 15 to 100 Å with a narrow pore-size distribution through the adequate surfactant as the template and synthetic condition.…”

Section: Introductionmentioning

confidence: 99%

Synthesis, Characterization and Catalysis of Ce-MCM-41

Chien¹,

Kuo²,

Chen³

2005

Jnl Chinese Chemical Soc

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The cerium-containing MCM-41 (Ce-MCM-41) has been synthesized by direct hydrothermal method. The low-angle XRD patterns revealed the typical five major peaks of MCM-41 type hexagonal structures. The interplanar spacing d100 = 38.4 Å was obtained that can be indexed on a hexagonal unit cell parameter with ao = 44.3 Å which was larger than that of pure siliceous MCM-41 (Si-MCM-41). Transmission electron micrograph shows the regular hexagonal array of uniform channel characteristics of MCM-41. The BET surface area of Ce-MCM-41 was 840 m 2 /g, which is much reduced as compared to that of Si-MCM-41, with the pore size of 26.9 Å and mesopore volume of 0.78 cm 3 /g were measured by nitrogen adsorption-desorption isotherm at 77 K. Along with the results, the synthesized Ce-MCM-41 exhibited a well-ordered MCM-41-type mesoporous structure with the incorporation of cerium. Using Ce-MCM-41 as a support, the Rh (0.5 wt%) catalyst exhibited very high activity for the NO/CO reactions.

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“…As seen in Figure 3 and According to an explanation in a previous work [28], p-mentha-3,8-diene may be a product of βcitronellal since the latter compound can be cyclized to result in isopulegol with byproducts including menthone, pulegol, and other cyclic hydrocarbons such as α-terpinene, p-mentha-3,8-diene and terpinolene.…”

Section: Gc-ms Analysis Of Tom Yum Soup and Compound Identificationmentioning

confidence: 75%

Characterization of Volatile Compounds in Tom Yum Soup by Headspace-Solid Phase Microextraction-Gas Chromatography-Mass Spectrometry Combined with Sensory Evaluation Techniques

Janta¹,

Kulsing²,

Nhujak³

2018

Preprint

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Gas chromatography-olfactometry/mass spectrometry coupled with headspace-solid phase microextraction (HS-SPME/GC-O/MS) was applied for the characterization of volatile compounds in Tom Yum soup and its individual ingredients. Using HS-SPME with a 50/30 µm DVB/CAR/PDMS fiber and an extraction temperature of 40 °C for 50 min along with an HP-5MS capillary column, 101 peaks in the HS-SPME/GC-MS chromatogram of Tom Yum soup were detected, and 96 compounds were identified including alcohols, aldehydes, esters, ethers, and terpenes. These findings are based on the comparison of MS spectra with the NIST library as well as experimental and literature retention index data. In comparison with the compound profiles of each individual ingredient of Tom Yum soup (both before and after cooking), five extra volatile compounds in Tom Yum soup were found after the cooking process. Furthermore, odor descriptions of the eighteen aroma compounds in Tom Yum soup, along with the odor ingredient sources, were also obtained.

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Vapor‐Phase Reaction of Citronellal over Mesoporous Molecular Sieves MCM‐41 and Zeolites

Cited by 8 publications

References 41 publications

Effect of Binders on the Physicochemical and Catalytic Properties of Extrudate-Shaped Beta Zeolite Catalysts for Cyclization of Citronellal

Effect of Binders on the Physicochemical and Catalytic Properties of Extrudate-Shaped Beta Zeolite Catalysts for Cyclization of Citronellal

Synthesis, Characterization and Catalysis of Ce-MCM-41

Characterization of Volatile Compounds in Tom Yum Soup by Headspace-Solid Phase Microextraction-Gas Chromatography-Mass Spectrometry Combined with Sensory Evaluation Techniques

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