Mesoporous ZSM-5 zeolites via alkali treatment for the direct hydroxylation of benzene to phenol with N2O

Gopalakrishnan, S.; Zampieri, A.; Schwieger, Wilhelm

doi:10.1016/j.jcat.2008.09.002

Cited by 66 publications

(43 citation statements)

References 30 publications

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“…The more Ni being loaded on ZMC carbon, the more effect it will have towards the adsorption capacity of the H 2 gas. These results matched with the previous research being done about the effects of loading Ni towards the H 2 gas adsorption capacity of a mesoporous carbon material (Ni/OMC), in which each used an SBA-15 template and a Phloroglucinol/F127 template [2,[7][8].…”

Section: Electron Microscopy-energy Dispersive X-ray (Sem-edx) Scanningsupporting

confidence: 88%

“…On the whole, the solids showed the same isothermal pattern, which was type IV with a loop hysteresis at P/P 0 > 0.45, which is a typical loop hysteresis for mesoporous solids. The measured value of the surface area (S BET ) for ZMC carbon is 910,46 m 2 /g, whilst for Ni/ZMC-5, Ni/ZMC-15 and Ni/ZMV-25 respectively are 833.85, 737.08 and 563.97 m 2 /g. Overall the samples have a uniform distribution of pore sizes which were measured by using the BJH method with the average pore diameter of 3.8 nm (Fig.…”

Section: Electron Microscopy-energy Dispersive X-ray (Sem-edx) Scanningmentioning

confidence: 94%

“…According to IUPAC, the presence of a loop hysteresis at a pressure of P/P 0 < 1 is a classification of type IV isothermal adsorptiondesorption of nitrogen and a characteristic of a type of a mesoporous material. The specific surface area measurement of a synthesized ZSM-5 resulted in a value of 246.23 m 2 /g and a pore volume of 0.39 cc/g. On the other hand, the measurement of the pore diameter by using the BJH method resulted in a pore diameter of 3.85 nm.…”

Section: Electron Microscopy-energy Dispersive X-ray (Sem-edx) Scanningmentioning

confidence: 99%

“…A couple of carbon based hydrogen storing materials prepared by using porous materials template like zeolite Y, β, L, 13X as well as SBA-15, SBA-16 and KIT-6 mesoporous silica have been widely reported [2][3]. But taking advantage of a mesoporous ZSM-5 zeolite as a carbon template has not been much reported, therefore it is very interesting to study the material characteristics and its H 2 uptake capabilities from mesoporous carbon with ZSM-5 mesoporous template.…”

Section: Introductionmentioning

confidence: 99%

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Impregnation Nickel on Mesoporous ZSM-5 Templated Carbons as a Candidate Material for Hydrogen Storage

2017

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Section: Electron Microscopy-energy Dispersive X-ray (Sem-edx) Scanningsupporting

confidence: 88%

Section: Electron Microscopy-energy Dispersive X-ray (Sem-edx) Scanningmentioning

confidence: 94%

Section: Electron Microscopy-energy Dispersive X-ray (Sem-edx) Scanningmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Impregnation Nickel on Mesoporous ZSM-5 Templated Carbons as a Candidate Material for Hydrogen Storage

2017

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“…It is suggested that the improvements in the catalytic performances are due to the presence of mesopores in the crystals, which likely reduce the lengths of remaining micropores and improve the transport of the phenol molecule out of the zeolite crystal. 47 It is reported that a sheet-like ZSM-5 zeolite deactivates much slower than bulk Fe/ZSM-5, which is attributed to the much lower probability of secondary reactions of phenol in the short straight channels of the sheets. It is found that carbonaceous materials are mainly deposited in the mesopores between the nanosheets and to a much lesser extent in the micropores.…”

Section: Oxidation Of Benzene To Phenolmentioning

confidence: 99%

Catalytic test reactions for the evaluation of hierarchical zeolites

2016

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Catalytic test reactions for the evaluation of hierarchical zeolitesStudies on the synthesis, characterization and catalytic performance of hierarchical zeolites and related porous materials are currently revitalizing the mature field of zeolite research. This review discusses the challenges in evaluating the catalytic performance of a hierarchical zeolite catalyst compared to its parent zeolite. zeolites and the facilitated access and transport in the additional meso-or macropore system. In this tutorial review, we discuss several test reactions that have been explored to show the benefit of the hierarchical pore system with respect to their suitability to prove the positive effects of hierarchical porous zeolites. It is important to note that positive effects on activity, stability and less frequently selectivity observed for hierarchically structured catalysts not necessarily are only a consequence of the additional meso-or macropores but also the number, strength and location of active sites as well as defects and impurities. With regard to these aspects, the test reaction has to be chosen carefully and potential changes in the chemistry of the catalyst have to be considered as well. In addition to the determination of conversion, yield and selectivity, we will show that the calculation of the activation energy and the determination of the Thiele modulus and the effectiveness factor are good indicators of the presence or absence of diffusion limitations in hierarchical zeolites compared to their parent materials. Key learning pointsHierarchical zeolites are an emerging technology in the mature field of industrial catalysts. Several test reactions are suggested to prove the advantage of their hierarchical structure. In addition to an increase in activity and selectivity suppression of coke formation is often observed. Concept of the Thiele modulus and the effectiveness factor is required to judge the presence of diffusion limitations in hierarchical catalysts.

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