Hydrothermal synthesis of high surface area mesoporous lithium aluminate

2007 ◽  
Vol 61 (2) ◽  
pp. 570-573 ◽  
Author(s):  
Zilong Tang ◽  
Linfeng Hu ◽  
Zhongtai Zhang ◽  
Junrong Li ◽  
Shaohua Luo
Keyword(s):  
Hydrothermal Synthesis ◽  
Surface Area ◽  
High Surface ◽  
High Surface Area ◽  
Lithium Aluminate

One-Step Hydrothermal Synthesis of MoS2 Nano-Flowers with High Surface Area and Crystalline

2012 ◽  
Vol 531-532 ◽  
pp. 508-511 ◽  
Author(s):  
Yan Juan Li ◽  
Nan Li ◽  
Xiao Yan ◽  
Yue Chi ◽  
Qing Yuan ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Hydrothermal Synthesis ◽  
Surface Area ◽  
Ph Value ◽  
High Surface ◽  
High Surface Area ◽  
Ammonium Molybdate ◽  
Molar Ratio ◽  
Sulfur Source ◽  
One Step

One-step and controlled pH hydrothermal synthesis of transition metal disulfide using double molybdenum sources to synthesize MoS2 nano-flowers at low temperature was first reported. Anhydrous molybdenum pentachloride (MoCl5) and four sulfur ammonium molybdate ((NH4) 6Mo7O24•4H2O) were the molybdenum source and CS (NH2) 2 was the sulfur source. Through hydrothermal method, MoS2 was obtained at 180 °C. The pH value of system was controlled by adjusting the molar ratio of MoCl5 and (NH4) 6Mo7O24•4H2O. The products were characterized by powder X-ray diffraction (XRD), scanning electron microscopy (SEM), surface area (BET) and transmission electron microscopy (TEM). The results show that the products were hexagonal MoS2 with a high crystalline and flower-like structure consisted of small particles. The thickness of petals is a few to tens of nanometers. By changing the molar ratio of molybdenum sources, the resultant phase from the mixed phase transited to the pure phase and the purity of synthetic MoS2 crystal increaseed.

scholarly journals Hydrothermal synthesis of high surface area CuCrO2 for H2 production by methanol steam reforming

RSC Advances ◽  
2021 ◽  
Vol 11 (21) ◽  
pp. 12607-12613
Author(s):  
Rong-Jun Huang ◽  
Subramanian Sakthinathan ◽  
Te-Wei Chiu ◽  
Chaofang Dong
Keyword(s):  
Hydrothermal Synthesis ◽  
Surface Area ◽  
Steam Reforming ◽  
High Surface ◽  
High Surface Area ◽  
H2 Production ◽  
Methanol Steam Reforming

Hydrothermal synthesis of CuCrO2 nanopowder for H2 production by methanol steam reforming.

Hydrothermal synthesis of high surface area ZIF-8 with minimal use of TEA

2017 ◽  
Vol 69 ◽  
pp. 13-21 ◽  
Author(s):  
V.V. Butova ◽  
A.P. Budnyk ◽  
E.A. Bulanova ◽  
C. Lamberti ◽  
A.V. Soldatov
Keyword(s):  
Hydrothermal Synthesis ◽  
Surface Area ◽  
High Surface ◽  
High Surface Area

scholarly journals Acylation of Anisole With Benzoyl Chloride Over Rapidly Synthesized Fly Ash–Based HBEA Zeolite

2021 ◽  
Vol 9 ◽  
Author(s):  
Alechine E. Ameh ◽  
Nicholas M. Musyoka ◽  
Oluwaseun Oyekola ◽  
Benoit Louis ◽  
Leslie F. Petrik
Keyword(s):  
Fly Ash ◽  
Hydrothermal Synthesis ◽  
Surface Area ◽  
Benzoyl Chloride ◽  
High Surface ◽  
High Surface Area ◽  
Strong Acid ◽  
Acid Sites ◽  
Synthesis Time ◽  
Strong Acid Sites

Stable HBEA zeolite with high surface area and strong acid sites was synthesized from coal fly ash–based silica extract via indirect hydrothermal synthesis. The rapid HBEA hydrothermal crystallization times of 8, 10, and 12 h were achieved through a reduced molar water fraction in the synthesis composition. The HBEA zeolites prepared from fly ash silica extract exhibited well-defined spheroidal-shaped crystal morphology with uniform particle sizes of 192, 190, or 239 nm obtained after 8, 10, or 12 h of synthesis time, respectively. The high surface area and the microporous area of 702 and 722 m2/g were achieved as a function of shorter hydrothermal synthesis durations (10 and 24 h, respectively) compared to 48 or 72 h, which resulted in HBEA zeolites with lower surface areas of 538 and 670 m2/g. Likewise, temperature-programmed desorption measurements of fly ash–based HBEA zeolites revealed the presence of weak and strong acid sites in the zeolite. The submicron crystal sizes with a well-defined porosity of HBEA zeolites enhanced the diffusion of anisole and benzoyl chloride molecules toward the active acid sites and hence showed better conversion and selectivity in acylation products. High conversion of benzoyl chloride with anisole was achieved, reaching up to 83% with a 93–96% selectivity toward 4-methoxyacetophenone.

scholarly journals High Surface Area Ceria Nanoparticles via Hydrothermal Synthesis Experiment Design

2016 ◽  
Vol 2016 ◽  
pp. 1-8 ◽  
Author(s):  
Stanislav Kurajica ◽  
Iva Minga ◽  
Martina Guliš ◽  
Vilko Mandić ◽  
Ivan Simčić
Keyword(s):  
Hydrothermal Synthesis ◽  
Surface Area ◽  
Fine Particles ◽  
High Surface ◽  
High Surface Area ◽  
Soot Oxidation ◽  
Nitrogen Adsorption ◽  
Synthesis Temperature ◽  
Oxidation Catalyst ◽  
Adsorption Desorption

Hydrothermal synthesis of CeO2was optimized on two reactant concentrations and synthesis temperature and duration, in order to achieve material having the greatest specific surface area (SSA). Taguchi method of experimental design was employed in evaluation of the relative importance of synthesis parameters. CeO2nanoparticles were characterized using X-ray diffraction, nitrogen adsorption-desorption isotherms, and scanning electron microscopy. Optimum conditions for obtaining particles with greater SSA were calculated according to Taguchi’s model “the-higher-the-better.” Synthesis temperature was found to be the only parameter significant for enabling nanoparticles with greater SSA. Mesoporous nanocrystalline ceria with SSA as great as 226 m2 g−1was achieved, which is unprecedented for the hydrothermally synthesized ceria. The reason for this achievement was found in temperature dependence of the diffusion coefficient which, when low, favors nucleation yielding with fine particles, while when high it favors crystal growth and formation of one-dimensional structures. The occurrence of 1D-structure in sample exhibiting the smallest SSA was confirmed. Very fine crystallites with crystallite size as low as 5.9 nm have been obtained being roughly inverse proportional to SSA. Selected samples were tested as catalyst for soot oxidation. Catalyst morphology turned out to be decisive factor for catalytic activity.

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