Synthesis and morphological studies of nanocrystalline MOR type zeolite material

Sharma, Pankaj; Rajaram, P.; Tomar, Radha

doi:10.1016/j.jcis.2008.05.058

Cited by 66 publications

(35 citation statements)

References 44 publications

(31 reference statements)

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“…Figure 4 (a) is the crystal morphology of Zn 2+ -Za. This morphology is similar to mordenite micrograph [20]. Distribution of metal on the surface is shown by dark spots in Figure 4 (b).…”

Section: Morphology Of Catalystssupporting

confidence: 75%

Catalytic Activities of Fe3+- and Zn2+-Natural Zeolite on the Direct Cyclisation-Acetylation of (R)-(+)-Citronellal

Cahyono

Muchalal

Triyono

et al. 2014

Bull. Chem. React. Eng. Catal.

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An investigation on characterisation and catalytic ativities of modified natural zeolite on cyclisationacetylation reaction of (R)-(+)-citronellal was performed. The experimental works involved the isolation of (R)-(+)-citronellal from Javanese citronella (Cymbopogon winterianus) oil by vacuum fractional distillation, the determination of its enantiomers, and the preparation and characterisation of different catalysts i.e. H-natural zeolite (H-Za), Fe 3+ -natural zeolite (Fe 3+ -Za), and Zn 2+ -natural zeolite (Zn 2+ -Za), followed by the examination of their activity and selectivity on cyclisation-acetylation reaction of (R)-(+)-citronellal. The isolated citronellal contained 88.21 ee.% of (R)-(+)-citronellal. The crystallinity and the morphology of the modified zeolites showed that the natural zeolite from Malang Indonesia has the main component of mordenite-type zeolite. The main products of cyclisation-acetylation of (R)-(+)-citronellal were isopulegyl acetate (IPA) and neo-isopulegyl acetate (NIPA). Fe 3+ -Za catalyst showed the highest activity towards IPA and NIPA production but its stereoselectivity was slightly lower than that of Zn 2+ -Za catalyst. It is shown that Lewis acidity plays the role in the formation of acetyl ionic from acetic anhydride.

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“…Figure 4 (a) is the crystal morphology of Zn 2+ -Za. This morphology is similar to mordenite micrograph [20]. Distribution of metal on the surface is shown by dark spots in Figure 4 (b).…”

Section: Morphology Of Catalystssupporting

confidence: 75%

Catalytic Activities of Fe3+- and Zn2+-Natural Zeolite on the Direct Cyclisation-Acetylation of (R)-(+)-Citronellal

Cahyono

Muchalal

Triyono

et al. 2014

Bull. Chem. React. Eng. Catal.

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“…The FTIR spectra of MOR in coarse condition and ground condition are shown in Figure 5 (a) and (b). The band around 3100 -3500 and that at 1630 cm -1 were the stretching and bending vibrations of the hydroxyl group, respectively [27,32]. The bands in the range of 920 -1250 cm -1 corresponded to the internal asymmetric stretching of tetrahedral groups, while those in the range of 650 -720 cm -1 corresponded to the internal symmetric stretching.…”

Section: Ftir Characterizationmentioning

confidence: 96%

“…The bands in the range of 920 -1250 cm -1 corresponded to the internal asymmetric stretching of tetrahedral groups, while those in the range of 650 -720 cm -1 corresponded to the internal symmetric stretching. The band in the range of 450 -500 cm -1 was indicative of T-O bonds (T = Si or Al with each metal ion bonded to four oxygen atoms) [27,30,32,33]. The band at 550 -590 cm -1 was associated with the structural order of tetrahedral ring and/or a octahedral ring [32].…”

Section: Ftir Characterizationmentioning

confidence: 99%

“…The band in the range of 450 -500 cm -1 was indicative of T-O bonds (T = Si or Al with each metal ion bonded to four oxygen atoms) [27,30,32,33]. The band at 550 -590 cm -1 was associated with the structural order of tetrahedral ring and/or a octahedral ring [32]. After surface treatment with MPTES, the peak around 2884 -2973 cm -1 could be observed, and this peak is associated with the asymmetric stretching of CH2 from the propyl groups of the grafted silane [27,34].…”

Section: Ftir Characterizationmentioning

confidence: 99%

“…Corresponding values for the degradation of organic species were 14% and 10%, shown in Figure 6. The minor weight loss observed beyond 800 ºC may be due to a high temperature solid-state transformation or because of oxide formation [32]. Data for total weight loss and percentage of silane treatment of all samples are summarized in Table 2.…”

Section: Tga Characterizationmentioning

confidence: 99%

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Mordenite/Nafion and analcime/Nafion composite membranes prepared by spray method for improved direct methanol fuel cell performance

Prapainainar

Kongkachuichay

et al. 2017

Applied Surface Science

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Highlight Mordenite and analcime were used as fillers in Nafion composite membranes for DMFC. The composite membranes were fabricated by spray method. Methanol permeability was reduced up to 2-3 times using the composite membranes. Mordenite/Naifon membrane showed 2 times higher DMFC performance than Nafion117. AbstractThe aim of this work was to improve proton exchange membranes (PEMs) used in direct methanol fuel cells (DMFCs). A membrane with a high proton conductivity and low methanol permeability was required. Zeolite filler in Nafion (NF matrix) composite membranes were prepared using two types of zeolite, mordenite (MOR) and analcime (ANA). Spray method was used to prepare the composite membranes, and properties of the membranes were investigated: mechanical properties, solubility, water and methanol uptake, ion-exchange capacity (IEC), proton conductivity, methanol permeability, and DMFC performance. It was found that MOR filler showed higher performance than ANA. The MOR/Nafion composite membrane gave better properties than ANA/Nafion composite membrane, including a higher proton conductivity and a methanol permeability that was 2 -3 times lower. The highest DMFC performance (10.75 mW·cm -2 ) was obtained at 70 °C and with 2 M methanol, with a value 1.5 times higher than that of ANA/Nafion composite membrane and two times higher than that of commercial Nafion 117 (NF 117).

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Multiporige Zeolithe: Synthese und Anwendungen bei der Katalyse

2015

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In den letzten Jahren wurde intensiv an der Synthese multiporiger Zeolithe gearbeitet, die Kanäle verschiedener Größen in ihrer Kristallstruktur enthalten. Dieses Thema ist so faszinierend, weil Poren mit verschiedenen Größen die bevorzugte Diffusion von Reaktanten und Produkten durch verschiedene Kanalsysteme begünstigen und damit besondere katalytische Aktivitäten für spezifische chemische Vorgänge ermöglichen können. Hier beschreiben wir die interessantesten Entwicklungen zur rationalen Synthese multiporiger Zeolithe mit kleinen bis extragroßen Poren sowie Verbesserungen, die für relevante chemische Verfahren mit diesen multiporigen Zeolithen als Katalysatoren erhalten werden können.

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Synthesis and morphological studies of nanocrystalline MOR type zeolite material

Cited by 66 publications

References 44 publications

Catalytic Activities of Fe3+- and Zn2+-Natural Zeolite on the Direct Cyclisation-Acetylation of (R)-(+)-Citronellal

Catalytic Activities of Fe3+- and Zn2+-Natural Zeolite on the Direct Cyclisation-Acetylation of (R)-(+)-Citronellal

Mordenite/Nafion and analcime/Nafion composite membranes prepared by spray method for improved direct methanol fuel cell performance

Multiporige Zeolithe: Synthese und Anwendungen bei der Katalyse

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