Determination of the Lamellar Phase Content in MCM-41 Using X-ray Diffraction, Nitrogen Adsorption, and Thermogravimetry

2000 ◽  
Vol 104 (7) ◽  
pp. 1581-1589 ◽  
Author(s):  
Michal Kruk ◽  
Mietek Jaroniec ◽  
Yong Yang ◽  
Abdelhamid Sayari
Keyword(s):  
Nitrogen Adsorption ◽  
Lamellar Phase ◽  
Phase Content ◽  
X Ray Diffraction ◽  
X Ray ◽  
Mcm 41

Synthesis and Characterization of Mesoporous Molecular Sieve Al-MCM-41 Using Kaolin as Raw Material

2013 ◽  
Vol 779-780 ◽  
pp. 201-204
Author(s):  
Miao Li ◽  
Hong Wang ◽  
Xian Qing Li ◽  
Jin Rong Liu
Keyword(s):  
Molecular Sieve ◽  
Nitrogen Adsorption ◽  
Mesoporous Molecular Sieve ◽  
Raw Material ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Adsorption Desorption ◽  
Calcined Kaolin ◽  
Mcm 41

Ordered hexagonally mesoporous molecular sieve Al-MCM-41 with Si/Al (atom) ratio=9 was prepared by hydrothermal synthesis using raw kaolin. X-ray diffraction (XRD), Nitrogen adsorption desorption, Transmission Electron Microscope (TEM) and Energy Dispersive X-ray Detector (EDX) were employed to characterise raw kaolin, calcined kaolin, as-synthesized and calcined Al-MCM-41. The results indicated that characteristic reflections of raw kaolin disappeared after calcination, both of as-synthesized and calcined Al-MCM-41 exhibited well ordered hexagonally mesoporous molecular sieve structure.

Textural features of highly ordered Al-MCM-41 molecular sieve studied by X-ray diffraction, nitrogen adsorption and transmission electron microscopy

2006 ◽  
Vol 60 (21-22) ◽  
pp. 2682-2685 ◽  
Author(s):  
Marcelo J.B. Souza ◽  
Antonio S. Araujo ◽  
Anne M.G. Pedrosa ◽  
Bojan A. Marinkovic ◽  
Paula M. Jardim ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Molecular Sieve ◽  
Nitrogen Adsorption ◽  
Textural Features ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Mcm 41

scholarly journals Dehydrogenation of Cyclohexane in Relation to Some Textural and Catalytic Properties of Ni/Al2O3 and Co/Al2O3 Catalysts

1997 ◽  
Vol 15 (1) ◽  
pp. 25-37 ◽  
Author(s):  
Th. El-Nabarawy
Keyword(s):  
Catalytic Properties ◽  
Textural Properties ◽  
Nitrogen Adsorption ◽  
Metal Dispersion ◽  
X Ray Diffraction ◽  
Flow Rates ◽  
X Ray ◽  
Dehydrogenation Of Cyclohexane ◽  
Adsorption Of Hydrogen

Ni/Al2O3 and Co/Al2O3 catalysts of different compositions have been prepared. Their structural properties were determined using X-ray diffraction and differential thermal analysis. The textural properties of these catalysts were determined from nitrogen adsorption at 77 K. The catalysts were reduced with hydrogen at 673 K and the adsorption of hydrogen on the reduced catalysts was measured at 320 K. Dehydrogenation of cyclohexane at flow rates of 10–30 ml/min and at 633–723 K was investigated. The loading of alumina with metal oxides leads to changes in the textural properties depending on the degree of loading and on the loaded metal oxide. The adsorption of hydrogen allowed the determination of important catalytic parameters. Dehydrogenation of cyclohexane on the investigated catalysts followed fraction order kinetics. The dehydrogenation activity has been related to the H2 uptake and to the extent of metal dispersion on the support.

scholarly journals Determination of L21 versus B2 phase content in Heusler alloys Ni2MnGa and Co2FeGe0.5Ga0.5 with X-ray diffraction

2018 ◽  
Vol 74 (a2) ◽  
pp. e257-e257
Author(s):  
Petr Cejpek ◽  
Daniel Král ◽  
Elen Duverger-Nédellec ◽  
Lukáš Horák ◽  
Vacláv Holý
Keyword(s):  
Heusler Alloys ◽  
Phase Content ◽  
X Ray Diffraction ◽  
X Ray ◽  
B2 Phase

scholarly journals Electrochemical Determination of Diclofenac by Using ZIF-67/g-C3N4 Modified Electrode

2021 ◽  
Vol 2021 ◽  
pp. 1-14
Author(s):  
Dang Thi Ngoc Hoa ◽  
Nguyen Thi Thanh Tu ◽  
Le Van Thanh Son ◽  
Le Vu Truong Son ◽  
Tran Thanh Tam Toan ◽  
...  
Keyword(s):  
Modified Electrode ◽  
Self Assembly ◽  
Carbon Nitride ◽  
Nitrogen Adsorption ◽  
Differential Pulse ◽  
Electrochemical Determination ◽  
X Ray Diffraction ◽  
X Ray ◽  
Adsorption Desorption

A facial differential pulse voltammetric procedure using a glassy carbon electrode modified with zeolite imidazolate framework-67/graphitic carbon nitride (ZIF-67/g-C3N4) for the diclofenac (DCF) determination is demonstrated. ZIF-67/g-C3N4 with different mass ratios of the components was synthesized in a self-assembly process. The obtained materials were characterized by using X-ray diffraction, scanning electron microscopy (SEM), EDX-mapping, and nitrogen adsorption/desorption isotherms. The peak current varies linearly with the DCF concentration in the range of 0.2–2.2 μmol·L−1 and has a detection limit of 0.071 μmol·L−1. The modified electrode exhibits acceptable repeatability, reproducibility, and selectivity towards DCF. The proposed electrode allows determining DCF in human urine without pretreatment, and the results are comparable with those determined with HPLC.

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