Nano size Hβ zeolite as an effective support for Ni and Ni  Cu for CO x  free hydrogen production by catalytic decomposition of methane

Gutta, Naresh; Kumar, Velisoju Vijay; Anjaneyulu, Ch.; Tardio, James; Bhargava, Suresh K.; Patel, Jim; Venugopal, A.

doi:10.1016/j.ijhydene.2016.09.131

Cited by 40 publications

(44 citation statements)

References 41 publications

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“…It was reported that Cu doping improved the reducibility of the Ni-based catalyst (Cu is easier to reduce than Ni) and enhanced its stability and activity in the CDM at high temperature [23][24][25][26][27][28][29][30][31][32][33][34]. The Ni-Cu alloy is formed over a wide composition range and at temperatures above 354 • C [35].…”

Section: Introductionmentioning

confidence: 99%

Co-, Cu- and Fe-Doped Ni/Al2O3 Catalysts for the Catalytic Decomposition of Methane into Hydrogen and Carbon Nanofibers

2018

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The catalytic decomposition of methane (CDM) process produces hydrogen in a single stage and avoids CO 2 emission thanks to the formation of high added value carbon nanofilaments as a by-product. In this work, Ni monometallic and Ni-Co, Ni-Cu, and Ni-Fe bimetallic catalysts are tested in the CDM reaction for the obtention of fishbone carbon nanofibers (CNF). Catalysts, in which Al 2 O 3 is used as textural promoter in their formulation, are based on Ni as main active phase for the carbon formation and on Co, Cu, or Fe as dopants in order to obtain alloys with improved catalytic behaviour. Characterization of bimetallic catalysts showed the formation of particles of Ni alloys with a bimodal size distribution. For the doping content studied (5 mol. %), only Cu formed an alloy with a lattice constant high enough to be able to favor the carbon diffusion through the catalytic particle against surface diffusion, resulting in higher carbon formations, longer activity times, and activity at 750 • C; whereas Ni, Ni-Co, and Ni-Fe catalysts were inactive. On the other hand, Fe also improved the undoped catalyst performance presenting a higher carbon formation at 700 • C and the obtention of narrow carbon nanofilaments from active Ni 3 Fe crystallites.

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Section: Introductionmentioning

confidence: 99%

Co-, Cu- and Fe-Doped Ni/Al2O3 Catalysts for the Catalytic Decomposition of Methane into Hydrogen and Carbon Nanofibers

2018

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“…In other words, carbon diffusion through the metal particles is favored by catalyst promotion. As a result, the formation of encapsulating carbon on the active sites is prevented and the catalyst lifetime is prolonged [61,64,101,103]. Additionally, suitable dopants enhance the dispersion of the metal particles on the catalyst support [66,[104][105][106][107] and improve the reducibility of the metal species.…”

Section: Role Of Metal Promoters and Catalyst Supportmentioning

confidence: 99%

“…These metals are active sites for the dissociation of hydrogen during the catalyst reduction step prior to the reaction, which facilitates the formation of metallic nickel [63,64,[106][107][108]. Furthermore, the weaker interaction between the metal particles and the support after catalyst doping also contributes to an improved reducibility of the metal species [101,103,106,107].…”

Section: Role Of Metal Promoters and Catalyst Supportmentioning

confidence: 99%

Methane Pyrolysis for CO₂‐Free H₂ Production: A Green Process to Overcome Renewable Energies Unsteadiness

Sanchez‐Bastardo

Schlögl

Ruland

2020

Chemie Ingenieur Technik

136

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The Carbon2Chem® project aims to convert exhaust gases from the steel industry into chemicals such as methanol to reduce CO2 emissions. Here, H2 is required for the conversion of CO2 into methanol. Although much effort is put to produce H2 from renewables, the use of fossil fuels, especially natural gas, seems to be fundamental in the short term. For this reason, the development of clean technologies for the processing of natural gas with a low environmental impact has become a topic of utmost importance. In this context, methane pyrolysis has received special attention to produce CO2‐free H2.

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“…Estes resultados estão de acordo com NARESH et al [11] que estudaram a decomposição catalítica do metano utilizando catalisadores de Ni e Cu suportados em zeólita Hbeta.…”

Section: Caracterização Dos Catalisadoresunclassified

“…As bandas em 280 e 440 nm, presentes nos catalisadores Ni10/Hbeta, Ni10Cu2,5/Hbeta, Ni10Cu5/Hbeta, Ni10Cu10/Hbeta podem ser atribuídas à transferência de carga metal-ligante (Ni +2 ← O -2 ) e a transição d-d do níquel, respectivamente [11]. Este espectro está de acordo com os dados reportados na literatura para catalisadores de Ni e é referente à presença de espécies de Ni +2 em geometria octaédrica.…”

Section: Caracterização Dos Catalisadoresunclassified

Catalisadores à base de Ni e Cu suportados sobre Hbeta - Avaliação na hidrodesoxigenação do benzaldeído

et al. 2018

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RESUMOForam estudados catalisadores a base de níquel (Ni) e cobre (Cu) suportados em Hbeta cuja atividade e seletividade foram avaliadas na reação de Hidrodesoxigenação (HDO) do benzaldeído. Para isso, sintetizaram-se catalisadores com 10,0 % de NiO (em massa) e adicionaram-se diferentes teores de CuO: 2,5 %, 5,0 %, 7,5 % e 10,0 % (em massa). Para efeito de comparação, foram sintetizados, também, os monometálicos NiO 10,0 % e CuO 10,0 % (em massa). A reação foi realizada em reator batelada com agitação magnética a 220 °C. Os catalisadores foram caracterizados pelas técnicas de difratometria de raios X (DRX), fisissorção de N 2 , redução com hidrogênio à temperatura programada (RTP-H 2 ), espectroscopia por reflectância difusa nas regiões do ultravioleta e do visível (ERD UV-Vis ) e análise termogravimétrica (TG/DTG). Pelos resultados de avaliação catalítica observou-se que o benzaldeído foi convertido em álcool benzílico, tolueno e benzeno. O catalisador Ni10Cu7,5/Hbeta apresentou conversão de 84,7 %, com seletividade para tolueno em torno de 91,0 %, apresentando maior seletividade a produtos desoxigenados que o catalisador com maior teor metálico (Ni10Cu10/Hbeta), fato que, possivelmente, possa estar associado à maior quantidade de sítios ácidos no catalisador. Os catalisadores bimetálicos apresentaram-se mais ativos que os monometálicos Ni e Cu. Dessa forma, a adição do Cu pode contribuir para a melhor performance dos catalisadores de Ni/Hbeta na reação de HDO.Palavras-chave: hidrodesoxigenação, benzaldeído, bio-óleo, catalisadores não sulfetados. ABSTRACTThe activity and selectivity evaluation of nickel (Ni) and copper (Cu) catalysts supported over Hbeta in the hydrodeoxygenation (HDO) reaction of benzaldehyde were studied. For this purpose, monometallic (10 wt.% of NiO or CuO) and bimetallic catalysts with 10 wt.% of NiO with different CuO (2.5 %, 5 %, 7.5 % and 10 % by wt.) were synthesized. The reaction was carried out in batch reactor with magnetic stirring at 220 °C. The catalysts were characterized by X-ray diffraction (XRD), N 2 physisorption, hydrogen temperature programmed (TPR-H 2 ), diffuse reflectance spectroscopy in ultraviolet and visible regions (DRS UV-Vis ), thermogravimetric analysis (TG / DTG). Results of the catalytic evaluation showed that the benzaldehyde was converted to benzyl alcohol, toluene and benzene. Ni10Cu7.5/Hbeta catalyst presented a conversion of 84.73 %, with selectivity to toluene around 91 %, presenting higher selectivity to deoxygenated products than Ni10Cu10/Hbeta, which can be related to the higher acidic sites present in the catalyst. The bimetallic catalysts were more active than the monometallic Ni and Cu. Thus the addition of Cu can contribute to a better performance of the Ni/Hbeta catalysts in the HDO reaction.

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Nano size Hβ zeolite as an effective support for Ni and Ni Cu for CO x free hydrogen production by catalytic decomposition of methane

Cited by 40 publications

References 41 publications

Co-, Cu- and Fe-Doped Ni/Al2O3 Catalysts for the Catalytic Decomposition of Methane into Hydrogen and Carbon Nanofibers

Co-, Cu- and Fe-Doped Ni/Al2O3 Catalysts for the Catalytic Decomposition of Methane into Hydrogen and Carbon Nanofibers

Methane Pyrolysis for CO₂‐Free H₂ Production: A Green Process to Overcome Renewable Energies Unsteadiness

Catalisadores à base de Ni e Cu suportados sobre Hbeta - Avaliação na hidrodesoxigenação do benzaldeído

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Nano size Hβ zeolite as an effective support for Ni and Ni Cu for CO x free hydrogen production by catalytic decomposition of methane

Cited by 40 publications

References 41 publications

Co-, Cu- and Fe-Doped Ni/Al2O3 Catalysts for the Catalytic Decomposition of Methane into Hydrogen and Carbon Nanofibers

Co-, Cu- and Fe-Doped Ni/Al2O3 Catalysts for the Catalytic Decomposition of Methane into Hydrogen and Carbon Nanofibers

Methane Pyrolysis for CO2‐Free H2 Production: A Green Process to Overcome Renewable Energies Unsteadiness

Catalisadores à base de Ni e Cu suportados sobre Hbeta - Avaliação na hidrodesoxigenação do benzaldeído

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Methane Pyrolysis for CO₂‐Free H₂ Production: A Green Process to Overcome Renewable Energies Unsteadiness