Call us toll-free

Synthesis and Application of Mesoporous Alumina - …

Mesoporous Alumina (I): Comparison of Synthesis …

Approximate price

Pages:

275 Words

$19,50

Microwave synthesis of mesoporous and microporous alumina powders

A mesoporous alumina was synthesized by a posthydrolysis method. The prepared mesoporous alumina was found to have randomly ordered pores, and retained relatively high surface area with narrow pore size distribution centered at ca. 4 nm. Nickel precursors were then supported on the mesoporous alumina by an impregnation (Ni-IMP) and vapor deposition (Ni-VD) method. Several characterizations were carried out in order to investigate physical and chemical properties of mesoporous alumina and supported Ni catalysts. TPR, XPS, and UV-DRS measurements revealed that the Ni-IMP catalyst retained much more amounts of surface nickel aluminate-like species than the Ni-VD sample. TPD experiments also showed that nickel aluminate species affected the adsorption amounts of reactant (1,2-dichloropropane). In the hydrodechlorination of 1,2-dichloropropane (DCPA), DCPA conversion over the Ni-VD catalyst was about two times higher than that over the Ni-IMP catalyst at 300 °C. It is probably due to the fact that the Ni-VD catalyst, which had low contents of nickel aluminate species compared to the Ni-IMP catalyst, exhibited higher degree of reduction than the Ni-IMP catalyst at pretreatment conditions. The difference in DCPA conversion between two catalysts was closely related to the degree of reduction of nickel species and the amounts of adsorption of DCPA onto the catalyst as well.

Synthesis and characterization of mesoporous alumina …

Hard template possess well-confined void, which is in the form of channels, pores, or connected hollow spaces. The connectivity of the pores or channels strongly influences the structure of the resulting solid product. In the case of nonconnected porous templates such as AAO (anodic aluminum oxide) membranes solid product forms inside the isolated pores, replicating the shape of the void space in templates. As a result, aligned structures such as 1D nanotubes and nanowires are usually obtained after removing the template scaffold. However, the nanowires or nanotubes arrays fabricated from mesoporous silica are inter-connected by small pillars formed in the micro- or mesopores in the silica pore walls. Some authors also called this method "nanocasting"in order to differentiate it from the template synthesis based on AAO membranes. The most widely used hard templates are AAO membranes because of their facile preparation and controllable pore size. Template synthesis method based on AAO membrane has particularly fascinated scientists due to its simplicity and diverse applicabilities.
The Martin group pioneered and extensively studied this method since it was first reported by Possin et al. Different methods such as electrochemical deposition, sol-gel, and chemical vapor depositions can be combined with the template synthesis technique to fabricate different types of materials (e.g. metals, carbons, semiconductors, metal oxides, conductive polymers, etc.) with different morphologies (e.g. nanotubes, nanowires, nanorings, nanodots and heterogeneous nanostructures etc.) Furthermore, dimensions of the deposited nanostructures can be easily controlled by regulating the template pores and deposition conditions. When the term of "template synthesis" is mentioned in the research papers, it is mostly often referred to hard template synthesis using AAO membrane, which will also be the main synthetic method discussed in this thesis.

Synthesis of Pure Alumina Mesoporous Materials | …

19/12/2017 · Synthesis of Mesoporous Alumina with Highly Thermal Stability Using Glucose Template in Aqueous System

N2 - A mesoporous alumina was synthesized by a posthydrolysis method. The prepared mesoporous alumina was found to have randomly ordered pores, and retained relatively high surface area with narrow pore size distribution centered at ca. 4 nm. Nickel precursors were then supported on the mesoporous alumina by an impregnation (Ni-IMP) and vapor deposition (Ni-VD) method. Several characterizations were carried out in order to investigate physical and chemical properties of mesoporous alumina and supported Ni catalysts. TPR, XPS, and UV-DRS measurements revealed that the Ni-IMP catalyst retained much more amounts of surface nickel aluminate-like species than the Ni-VD sample. TPD experiments also showed that nickel aluminate species affected the adsorption amounts of reactant (1,2-dichloropropane). In the hydrodechlorination of 1,2-dichloropropane (DCPA), DCPA conversion over the Ni-VD catalyst was about two times higher than that over the Ni-IMP catalyst at 300 °C. It is probably due to the fact that the Ni-VD catalyst, which had low contents of nickel aluminate species compared to the Ni-IMP catalyst, exhibited higher degree of reduction than the Ni-IMP catalyst at pretreatment conditions. The difference in DCPA conversion between two catalysts was closely related to the degree of reduction of nickel species and the amounts of adsorption of DCPA onto the catalyst as well.

AB - A mesoporous alumina was synthesized by a posthydrolysis method. The prepared mesoporous alumina was found to have randomly ordered pores, and retained relatively high surface area with narrow pore size distribution centered at ca. 4 nm. Nickel precursors were then supported on the mesoporous alumina by an impregnation (Ni-IMP) and vapor deposition (Ni-VD) method. Several characterizations were carried out in order to investigate physical and chemical properties of mesoporous alumina and supported Ni catalysts. TPR, XPS, and UV-DRS measurements revealed that the Ni-IMP catalyst retained much more amounts of surface nickel aluminate-like species than the Ni-VD sample. TPD experiments also showed that nickel aluminate species affected the adsorption amounts of reactant (1,2-dichloropropane). In the hydrodechlorination of 1,2-dichloropropane (DCPA), DCPA conversion over the Ni-VD catalyst was about two times higher than that over the Ni-IMP catalyst at 300 °C. It is probably due to the fact that the Ni-VD catalyst, which had low contents of nickel aluminate species compared to the Ni-IMP catalyst, exhibited higher degree of reduction than the Ni-IMP catalyst at pretreatment conditions. The difference in DCPA conversion between two catalysts was closely related to the degree of reduction of nickel species and the amounts of adsorption of DCPA onto the catalyst as well.

MCM-41 (Mobil Composition of Matter No

03/10/2006 · Mesoporous Alumina (I): Comparison of Synthesis Schemes Using Anionic, Cationic, and Non-Ionic Surfactants

NON-CRYSTALLINE COPPER OXIDE HIGHLY DISPERSED ON MESOPOROUS ALUMINA: SYNTHESIS, CHARACTERIZATION AND CATALYTIC ACTIVITY IN GLYCEROL CONVERSION TO ACETOL

Synthesis and characterization of mesoporous alumina for use as a Read more about nickel, supported, alumina, catalyst, mesoporous and pore.
Order now
  • Also functionalized with -COOH and -NH2 groups

    MCM-41 - Wikipedia

  • Spindle-like Mesoporous α-Fe2O3 Anode Material …

    Single- and Multi-Walled Nanotubes produced through CVD (Chemical Vapor Deposition)

  • Nanocomposites: synthesis, structure, properties and …

    Spindle-like Mesoporous α-Fe 2 O 3 Anode Material Prepared from MOF Template for High-Rate Lithium Batteries

Order now
  • Kim

    "I have always been impressed by the quick turnaround and your thoroughness. Easily the most professional essay writing service on the web."

  • Paul

    "Your assistance and the first class service is much appreciated. My essay reads so well and without your help I'm sure I would have been marked down again on grammar and syntax."

  • Ellen

    "Thanks again for your excellent work with my assignments. No doubts you're true experts at what you do and very approachable."

  • Joyce

    "Very professional, cheap and friendly service. Thanks for writing two important essays for me, I wouldn't have written it myself because of the tight deadline."

  • Albert

    "Thanks for your cautious eye, attention to detail and overall superb service. Thanks to you, now I am confident that I can submit my term paper on time."

  • Mary

    "Thank you for the GREAT work you have done. Just wanted to tell that I'm very happy with my essay and will get back with more assignments soon."

Ready to tackle your homework?

Place an order