High effective dehydration of bio-ethanol into ethylene over nanoscale HZSM-5 zeolite catalysts

Bi, Jiandong; Guo, Xinwen; Liu, Min; Wang, Xiangsheng

doi:10.1016/j.cattod.2009.04.016

Cited by 110 publications

(84 citation statements)

References 19 publications

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“…These larger sizes corroborate the N 2 isotherm adsorption results and the phenomena encountered in the study of the adsorption kinetics discussed below. Compared with the results of Bi et al, 39 the zeolite modified with Nb maintained a microscale size in the range of 1-5 µm. There are, however, large clusters of up to 100 times that size.…”

Section: Resultsmentioning

confidence: 89%

Characterization of ZSM-5 modified with niobium pentoxide: the study of thiophene adsorption

Cavalcanti

Barros

Dias

et al. 2013

J. Braz. Chem. Soc.

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Adsorventes ZSM-5 impregnados com Nb 2 O 5 foram aplicados na remoção de enxofre sob a forma de tiofeno, substância refratária de difícil remoção dos combustíveis líquidos. Para tanto, foi preparado um combustível modelo contendo iso-octano contaminado com tiofeno nas concentrações de 877,5 a 1155 ppmw. As amostras foram caracterizadas por difratometria de raios X (XRD), espectroscopias no infravermelho (FTIR) e Raman (FT-Raman) por transformada de Fourier para confirmação dos adsorventes obtidos, sendo priorizado o estudo de adsorção com aquele contendo 5% de pentóxido de nióbio, que apresentou uma maior capacidade de remoção de tiofeno. Os melhores resultados de adsorção foram alcançados a 353 K, sendo observado um maior tempo para atingir o equilíbrio. Sob essas condições, o melhor ajuste cinético foi alcançado utilizando a equação de pseudo-segunda ordem, evidenciando o domínio do fenômeno de quimissorção. Por outro lado, sob menores temperaturas, o modelo de difusão apresentou uma melhor aproximação dos resultados experimentais. O aumento da temperatura também favoreceu os processos espontâneos.ZSM-5 adsorbents impregnated with Nb 2 O 5 were applied in the sulfur removal in the form of thiophene, refractory substance of difficult removal of liquid fuels. For this purpose, a model fuel containing iso-octane contaminated with thiophene in concentrations of 877.5 to 1155 ppmw was prepared. The samples were characterized by X-ray diffractometry (XRD), Fourier transform infrared (FTIR) and Fourier transform-Raman (FT-Raman) spectroscopies for confirmation of the adsorbents, being prioritized the adsorption study with that containing 5 wt.% of niobium pentoxide, because it showed a greater capacity for removal of thiophene. The best results of adsorption were achieved at 353 K, a longer time to reach equilibrium was observed. Under these conditions, the best kinetic fitting was achieved using the equation of pseudo-second order, demonstrating the domain of the phenomenon of chemisorption. While under lower temperatures, the diffusion model presented a better approximation of the experimental results. Also, the increasing of temperature did enhance spontaneous processes.

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Section: Resultsmentioning

confidence: 89%

Characterization of ZSM-5 modified with niobium pentoxide: the study of thiophene adsorption

Cavalcanti

Barros

Dias

et al. 2013

J. Braz. Chem. Soc.

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“…Hierarchical zeolites, such as nanocrystalline H-ZSM-5, exhibit significantly improved lifetimes compared to conventional H-ZSM-5 for ethylene production at 240 C. Thus, a lifetime in the order of 500 hours has been reported for nanocrystalline H-ZSM-5, compared to a lifetime of 120 hours for conventional microcrystalline H-ZSM-5. 68 The presence of water in the feed has been found to moderate the strongly acidic sites and enhance the catalyst activity and selectivity towards ethylene. 69 Furthermore, water often has a diminishing effect on the rate of coke formation and can thus be an instrument to improve the catalyst lifetime.…”

Section: 65mentioning

confidence: 99%

Zeolite-catalyzed biomass conversion to fuels and chemicals

Taarning

Osmundsen

Yang

et al. 2011

Energy Environ. Sci.

444

258

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Heterogeneous catalysts have been a central element in the efficient conversion of fossil resources to fuels and chemicals, but their role in biomass utilization is more ambiguous. Zeolites constitute a promising class of heterogeneous catalysts and developments in recent years have demonstrated their potential to find broad use in the conversion of biomass. In this perspective we review and discuss the developments that have taken place in the field of biomass conversion using zeolites. Emphasis is put on the conversion of lignocellulosic material to fuels using conventional zeolites as well as conversion of sugars using Lewis acidic zeolites to produce useful chemicals.

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“…Bi et al reported the improved catalytic performance of the nanoscale HZSM-5 zeolite should be attributed to the increase of acid sites on the external surface compared with that of the microscale HZSM-5. 35 Takahara et al reported that the increase in the number of acid sites of HZSM-5 zeolite during the dehydration of ethanol could cause the dehydration activity to increase. 36 The phenomena have been observed that titanium dioxide coupled with Al 2 O 3 or zeolite can effectively improve the catalytic activity of the composite catalysts for the dehydration of ethanol to ethylene.…”

Section: Resultsmentioning

confidence: 99%

Fabrication and Characterization of Titanate Nanotube Supported ZSM-5 Zeolite Composite Catalyst for Ethanol Dehydration to Ethylene

Wu¹,

Li²,

Yuan³

et al. 2014

Bulletin of the Korean Chemical Society

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High effective dehydration of bio-ethanol into ethylene over nanoscale HZSM-5 zeolite catalysts

Cited by 110 publications

References 19 publications

Characterization of ZSM-5 modified with niobium pentoxide: the study of thiophene adsorption

Characterization of ZSM-5 modified with niobium pentoxide: the study of thiophene adsorption

Zeolite-catalyzed biomass conversion to fuels and chemicals

Fabrication and Characterization of Titanate Nanotube Supported ZSM-5 Zeolite Composite Catalyst for Ethanol Dehydration to Ethylene

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