The effect of calcination temperature on physicochemical properties of alumina as a support for acetylene selective hydrogenation catalyst

Ravanchi, Maryam Takht; Fadaeerayeni, Siavash; Fard, Maryam Rahimi

doi:10.1007/s11164-015-2320-y

Cited by 15 publications

(4 citation statements)

References 24 publications

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“…7-13 nm) 6,7 are required to allow diffusion and access of larger molecules to the catalyst active sites. Conversely, certain highly selective processes such as the partial epoxidation of ethylene to ethylene oxide 8,9 and the selective oxidation or selective hydrogenation of acetylene 10 require catalysts with large pores and low surface areas. This acts to limit the residence time of substrate on the catalyst, thereby boosting selectivity to the desired products by limiting further reactions on the catalyst surface.…”

Section: Introductionmentioning

confidence: 99%

Tailoring morphology of hierarchical catalysts for tuning pore diffusion behaviour: a rational guideline exploiting bench-top pulsed-field gradient (PFG) nuclear magnetic resonance (NMR)

Forster

Lutecki

Fordsmand

et al. 2020

Mol. Syst. Des. Eng.

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Section: Introductionmentioning

confidence: 99%

Tailoring morphology of hierarchical catalysts for tuning pore diffusion behaviour: a rational guideline exploiting bench-top pulsed-field gradient (PFG) nuclear magnetic resonance (NMR)

Forster

Lutecki

Fordsmand

et al. 2020

Mol. Syst. Des. Eng.

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“…However, g-C 3 N 4 , whose structure closely resembles graphene, can be prepared by using chemical or molecular precursors and require only mild synthesis conditions [ 37–40 ]. Interestingly, g-C 3 N 4 possesses the properties of a medium-band gap semiconductor having a graphite-like structure with the CN framework attached with amine functionalities which mainly contributes to the catalysis of chemical reactions [ 41 ]. However, g-C 3 N 4 has low electronic conductivity and less specific surface area; therefore, cannot be used in electro-chemical hydrolysis reactions (1.4–2.8 eV) but it has been widely used in photocatalytic applications owing to its unique band structure.…”

Section: Types and The Characteristics Of Carbon Nitridesmentioning

confidence: 99%

Organocatalysis with carbon nitrides

Ruban

Ramadass

Singh

et al. 2023

Science and Technology of Advanced Materials

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Carbon nitrides, a distinguished class of metal-free catalytic materials, have presented a good potential for chemical transformations and are expected to become prominent materials for organocatalysis. This is largely possible due to their low cost, exceptional thermal and chemical stability, non-toxicity, ease of functionalization, porosity development, etc. Especially, the carbon nitrides with increased porosity and nitrogen contents are more versatile than their bulk counterparts for catalysis. These N-rich carbon nitrides are discussed in the earlier parts of the review. Later, the review highlights the role of such carbon nitride materials for the various organic catalytic reactions including Knoevenagel condensation, oxidation, hydrogenation, esterification, transesterification, cycloaddition, and hydrolysis. The recently emerging concepts in carbon nitride-based organocatalysis have been given special attention. In each of the sections, the structure–property relationship of the materials was discussed and related to their catalysis action. Relevant comparisons with other catalytic materials are also discussed to realize their real potential value. The perspective, challenges, and future directions are also discussed. The overall objective of this review is to provide up-to-date information on new developments in carbon nitride-based organic catalysis reactions that could see them rising as prominent catalytic materials in the future.

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“…Feed and product streams were analysed by an online GC apparatus (Varian-CP-3800), containing FID and TCD detectors. In the present research, the absence of mass and heat transfer limitations were checked at the applied operating conditions [17].…”

Section: Reaction Studymentioning

confidence: 99%

Catalytic Performance of Pd/Al2O3 Catalyst in the Presence of HHDMA Ligand in Acetylene Selective Hydrogenation Process

Ravanchi,

Fard,

Moosavi

et al. 2023

Univers. J. Catal. Sci.

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A series of Pd-HHDMA/Al2O3 catalysts were prepared with various Pd and hexadecyl-2-hydroxyethyldimethylammonium dihydrogen phosphate (HHDMA) amounts by the reduction-deposition method. The catalysts were characterized by N2-physisorption, FE-SEM, CO-TPD, TG and FT-IR techniques. Performance tests for tail-end semi-hydrogenation of acetylene to ethylene were performed in a fixed-bed reactor at 60 °C, 10 bar and GHSV=4000 h-1 . All catalysts exhibited egg-shell Pd distribution which is beneficial for selective semihydrogenation reaction. The BET surface area and pore volume of the catalysts decreased with increasing HHDMA content for a given Pd loading. The conversion of acetylene increased with Pd loading and decreased with HHDMA content. The ethylene production increased with HHDMA whereas that of undesirable C4+ oligomerization products (“green oil”), which are coke precursors, was effectively suppressed.

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The effect of calcination temperature on physicochemical properties of alumina as a support for acetylene selective hydrogenation catalyst

Cited by 15 publications

References 24 publications

Tailoring morphology of hierarchical catalysts for tuning pore diffusion behaviour: a rational guideline exploiting bench-top pulsed-field gradient (PFG) nuclear magnetic resonance (NMR)

Tailoring morphology of hierarchical catalysts for tuning pore diffusion behaviour: a rational guideline exploiting bench-top pulsed-field gradient (PFG) nuclear magnetic resonance (NMR)

Organocatalysis with carbon nitrides

Catalytic Performance of Pd/Al2O3 Catalyst in the Presence of HHDMA Ligand in Acetylene Selective Hydrogenation Process

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