Synthesis of nano‐crystalline zeolite β: Effects of crystallization parameters

Modhera, Bharat; Chakraborty, Mousumi; Parikh, Parimal A.; Jasra, Raksh V.

doi:10.1002/crat.200800474

Cited by 35 publications

(14 citation statements)

References 24 publications

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“…Though high partial pressure of hydrogen was maintained during the reaction, considerable quantity of pentanes has been observed on desilicated zeolites against almost absent on parent counter parts. This indicates that accumulation of the Pt-C ensembles which promote terminal splitting [16] might have increased due to the generation of mesopores.…”

Section: Catalyitc Performancementioning

confidence: 96%

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Influences of Mesoporosity Generation in ZSM-5 and Zeolite Beta on Catalytic Performance During n-Hexane Isomerization

et al. 2011

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Catalytic performance of Pt impregnated parent and desilicated nano-crystalline zeolites, ZSM-5 and Beta for n-hexane isomerization was studied. Difference in channel systems of the zeolites and absence/presence of mesopores therein were found to be reflected in product distributions. ZSM-5 was desilicated by NaOH and zeolite Beta with tetramethylammonium hydroxide (TMAOH.) Desilication was found to afford comparable catalytic performance to that of the parent counterpart at reaction temperature lower by 25°C. Observed product distributions could be substantiated with characterizations such as ammonia TPD, surface area determination and SEM. Desilicated zeolite Beta was seen to be less prone to coking as deduced from the TGA study. Location of Pt with reference to proton sites within the channels and that inside the pores viz a viz external surface also have been discussed briefly.

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Section: Catalyitc Performancementioning

confidence: 96%

“…Nano-crystalline zeolite Beta (Si/Al ratio of 25) was synthesized following the procedure reported earlier [16]. Commercial ZSM-5 (Si/Al ratio of 40) was used in the experiments.…”

Section: Catalyst Preparationmentioning

confidence: 99%

Influences of Mesoporosity Generation in ZSM-5 and Zeolite Beta on Catalytic Performance During n-Hexane Isomerization

et al. 2011

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“…Nano-crystalline zeolite Beta (Si/Al = 25) was synthesized in the presence of alkali media by hydrothermal treatment at 413 K. Details on synthesis [19] and those on catalyst preparation, characterization and catalytic studies [20] have already been reported. 1-Hexene was procured from Aldrich, Germany (97% pure).…”

Section: Methodsmentioning

confidence: 99%

1-Hexene Isomerization Over Nano-crystalline Zeolite Beta: Effects of Metal and Carrier Gases on Catalytic Performance

et al. 2009

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Zeolite Beta crystals in nanometer size (about 44 nm) were hydrothermally synthesized and its catalytic activities with and without Pt impregnation were studied for 1-hexene isomerization in presence of different carrier gases, namely, hydrogen, nitrogen and carbon dioxide and also in the absence of carrier gas at reaction temperatures of 473-573 K and 0.1 MPa. General observation for all the cases was that with reaction temperature, hexene conversion increased, however, total isomer selectivity dropped. With temperature skeletal isomerization increased at the cost of double bond shift isomerization. Observed product distribution has been explained on the basis of zeolite structure and crystal size. Catalyst performed better in nitrogen than in hydrogen or carbon dioxide as carrier gas. Nevertheless, catalyst life was shorter with nitrogen as carrier gas than that with hydrogen.

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“…Nano-crystalline zeolite beta (Si/Al = 25) was synthesized following the procedure described elsewhere [11]. Zeolite in powder form was placed in a glass vessel under vacuum at room temperature for 4 h to remove water and other impurities adsorbed on it.…”

Section: Methodsmentioning

confidence: 99%

“…Finally, pellets were crushed and sieved in order to obtain the particle size in the range of 10-20 mesh (1-2 mm) for the reaction. Details on catalyst's physico-chemical characterizations have been given earlier [11].…”

Section: Methodsmentioning

confidence: 99%

Simultaneous n-hexane isomerization and benzene saturation over Pt/nano-crystalline zeolite beta

Modhera

Chakraborty

Bajaj

et al. 2010

Reac Kinet Mech Cat

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Hydroisomerization of n-hexane simultaneously proceeding with benzene saturation over platinum impregnated nano-crystalline zeolite beta (Si/Al = 25) at 1.0 MPa and 573-673 K was studied. The feed contained 30 wt% benzene. The synthesized catalyst was characterized by various techniques, e.g., powder X-ray diffraction, IR spectroscopy, thermal analysis, scanning electron microscopy and nitrogen adsorption. At the operating conditions used, total saturation of benzene with 95% selectivity to cyclohexane (CH) and methylcyclopentane (MCP) was observed. n-Hexane conversion increased with temperature whether benzene was present or not during the reaction. However, in the presence of benzene, n-hexane conversions as well as isomer selectivities were observed to be lower. This was attributed to reduced availability of acid sites by predominating benzene adsorption. Formation of carbenium ion on an acid site is questioned and plausible mechanism has been suggested.

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Synthesis of nano‐crystalline zeolite β: Effects of crystallization parameters

Cited by 35 publications

References 24 publications

Influences of Mesoporosity Generation in ZSM-5 and Zeolite Beta on Catalytic Performance During n-Hexane Isomerization

Influences of Mesoporosity Generation in ZSM-5 and Zeolite Beta on Catalytic Performance During n-Hexane Isomerization

1-Hexene Isomerization Over Nano-crystalline Zeolite Beta: Effects of Metal and Carrier Gases on Catalytic Performance

Simultaneous n-hexane isomerization and benzene saturation over Pt/nano-crystalline zeolite beta

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