scholarly journals Enhanced Phenol Tert-Butylation Reaction Activity over Hierarchical Porous Silica-Alumina Materials

Catalysts ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 1098
Author(s):  
Ling Xu ◽  
Fan Wang ◽  
Zhi Xiu ◽  
Limei Duan ◽  
Zongrui Liu ◽  
...  
Keyword(s):  
Physical Adsorption ◽  
Porous Silica ◽  
Mesoporous Structure ◽  
Catalytic Performance ◽  
Crystallization Time ◽  
Hydrothermal Conditions ◽  
Transmission Electron ◽  
Hierarchical Porous ◽  
Silica Alumina ◽  
Ft Ir

Hierarchical aluminum-silicon materials have been successfully prepared by mixing pre-crystallization of silica-alumina sol and citric acid under hydrothermal conditions. The influence of pre-crystallization time on the micro-mesoporous structure is studied using Fourier transform infrared spectroscopy (FT-IR), X-ray powder diffraction (XRD), N2 physical adsorption, and high-resolution transmission electron microscopy (HRTEM). The catalytic performance of hierarchical silica-alumina material is evaluated by alkylation of phenol with tert-butanol. The results show that the silica-alumina materials with a pre-crystallization time of 16 h show micro-mesoporous structure and excellent catalytic activity.

SYNTHESIS OF GRAPHITE OXIDE (GO)/Cu2O NANOCOMPOSITE AND ITS CATALYTIC PERFORMANCE UNDER THE ULTRASOUND

NANO ◽  
2013 ◽  
Vol 08 (03) ◽  
pp. 1350032 ◽  
Author(s):  
CHUNNIAN CHEN ◽  
CHENWEI YU ◽  
WEN FU
Keyword(s):  
Fourier Transform ◽  
Electrostatic Interactions ◽  
Catalytic Performance ◽  
X Ray ◽  
Selective Area ◽  
Transmission Electron ◽  
Vis Spectroscopy ◽  
Ft Ir ◽  
Ir And Raman ◽  
Selective Area Electron Diffraction

GO/ Cu2O nanocomposite had been successfully synthesized by electrostatic interactions method. X-ray powder diffraction (XRD), transmission electron microscope (TEM), selective-area electron diffraction (SAED), Fourier transform infrared spectroscopy (FT-IR) and Raman spectra confirmed the structure of the Cu2O and GO/ Cu2O nanocomposite. The catalytic degradation of Rhodamine B under the condition of ultrasound was investigated and the result of UV-Vis spectroscopy demonstrated that the nanocomposite can efficiently degraded it.

Microstructural of Cr/MWCNT Composites and its Catalysis in Synthesis of Biodiesel

2012 ◽  
Vol 455-456 ◽  
pp. 1053-1059
Author(s):  
Xue Hai Fan ◽  
Guo Min Xiao
Keyword(s):  
Electron Microscopy ◽  
Potassium Dichromate ◽  
Catalytic Performance ◽  
Impregnation Method ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Multi Walled Carbon Nanotubes ◽  
Ft Ir ◽  
Walled Carbon Nanotubes

Multi-walled carbon nanotubes (MWCNTs), potassium dichromate (K2Cr2O7) and sulphuric acid were used for the preparation of Cr/MWCNT composite by impregnation method. The composites were comprehensively characterized by transmission electron microscopy （TEM），energy dispersive X-ray analysis (EDX), infrared spectroscopy (FT-IR), X-ray diffraction (XRD) and thermal gravity analysis (TGA). Due to its unique electrical and structural properties, this composite was applied to the synthesis of biodiesel (FAME) as a catalyst, showing effectively catalytic performance.

scholarly journals Synthesis of Fatty Alcohols from Oil Palm Using a Catalyst of Ni-Cu Supported onto Zeolite

2010 ◽  
Vol 7 (4) ◽  
pp. 1138-1147 ◽  
Author(s):  
L. Giraldo ◽  
G. Camargo ◽  
J. Tirano ◽  
J. C. Moreno-Piraján
Keyword(s):  
Palm Oil ◽  
Oil Palm ◽  
High Surface ◽  
High Surface Area ◽  
Mesoporous Structure ◽  
Catalytic Performance ◽  
Fatty Alcohols ◽  
Zeolite Type ◽  
Hexagonal Arrangement ◽  
Ft Ir

A series of Ni-Cu supported onto zeolite type ZSM-5 has been synthesized by direct hydrothermal method without template agent and characterized using XRD, FT-IR, NRM mass, SEM, CG and N2adsorption techniques. The catalytic performance of the obtained materials was evaluated and utilized for the hydrogenation of palm oil at 453 K and 40 atmospheres of pressure. The results show that the samples exhibited typical hexagonal arrangement of mesoporous structure with high surface area and the heteroatoms were probably incorporated into the framework of ZSM-5. Catalytic tests show that the bimetallic incorporated materials were effective as catalysts in the hydrogenation of oil palm producing fatty alcohols typical.

Effects of Microwave and Ultrasonic-Assisted Aging on the Synthesis of H-ZSM-5 Nanozeolite and Its Catalytic Performance in Methanol Dehydration

2014 ◽  
Vol 12 (1) ◽  
pp. 355-362 ◽  
Author(s):  
Saeid Abbasian ◽  
Majid Taghizadeh
Keyword(s):  
Fixed Bed ◽  
Catalytic Performance ◽  
Operating Conditions ◽  
Fixed Bed Reactor ◽  
Crystallization Time ◽  
Microwave Assisted ◽  
Ultrasonic Assisted ◽  
Ft Ir ◽  
Static Conditions ◽  
Ultrasonic Stirring

Abstract H-ZSM-5 nanozeolite was hydrothermally synthesized under static conditions. Evaluation of hydrothermal synthesis of ZSM-5 was performed by treating the synthesis mixture using different aging processes, consist of ultrasonic, stirring, and microwave-assisted aging, prior to the conventional hydrothermal treatment. The catalytic performances of selected catalysts were studied for the dehydration of methanol to dimethyl ether (DME) in a fixed-bed reactor under the same operating conditions (T = 300°C, P = 1 atm, and WHSV = 26 h−1). The prepared samples were characterized by XRD, SEM, BET, NH3-TPD and FT-IR techniques. The results showed that ultrasonic and microwave-assisted aging shortened the crystallization time and reduced crystal size of the obtained products without having any considerable effects on their catalytic activities.

Synthesis, Characterization and Catalytic Properties of Monometal/SiO2 and Bimetal/SiO2 Hollow Spheres with Mesoporous Structure

NANO ◽  
2017 ◽  
Vol 12 (12) ◽  
pp. 1750148 ◽  
Author(s):  
Xinzhi Sun ◽  
Fanglin Du
Keyword(s):  
Electron Microscopy ◽  
Hollow Spheres ◽  
Mesoporous Structure ◽  
Hydrogen Atmosphere ◽  
Hydrothermal Conditions ◽  
Reaction Conditions ◽  
Transmission Electron ◽  
One Step ◽  
Temperature Programmed

Monometallic M1(M[Formula: see text] Ni/Cu/Fe/Co) silicates and bimetallic Ni–M2(M[Formula: see text] Cu/Fe/Co) silicates hollow spheres with mesoporous structure and the controllable morphology have been synthesized successfully via one-step sacrificial template method under hydrothermal conditions. The catalysts were obtained by reducing the corresponding silicates in situ under the hydrogen atmosphere at a certain temperature. All the silicates and the catalysts M1/SiO2 and Ni–M2/SiO2 hollow spheres have been characterized by X-ray powder diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Brunauer–Emmett–Teller (BET) and temperature-programmed reduction (TPR) thoroughly and systematically. The morphology and reaction conditions of bimetallic Ni–M2 silicates hollow spheres depend on the second metal M2, which has been verified by SEM, TEM and XRD. From the results, it can be concluded that bimetallic silicates possess better physical properties in favor of the catalytic activity. Bimetallic Ni–M2/SiO2 hollow spheres had higher catalytic property than the monometallic M1/SiO2 and the conversion of nitrobenzene could reach 100% within 3[Formula: see text]h using Ni–Cu/SiO2 and Ni–Fe/SiO2 hollow spheres as catalysts.

scholarly journals Pt Nanoparticles Supported on Nitrogen doped Carbon as an Efficient Catalyst for Decalin Dehydrogenation

2020 ◽  
Vol 194 ◽  
pp. 02025
Author(s):  
Huiru Yun ◽  
Zhuo Li ◽  
Shiguang Fan ◽  
Jian Wang ◽  
He Liu
Keyword(s):  
Chemical Properties ◽  
Pt Nanoparticles ◽  
Mesoporous Structure ◽  
Catalytic Performance ◽  
High Specific Surface Area ◽  
Efficient Catalyst ◽  
Transmission Electron ◽  
Mean Size ◽  
Nitrogen Doped Carbon ◽  
Physical And Chemical

A novel Pt/CN catalyst was synthesized by sodium borohydride treatment. The physical and chemical properties of Pt/CN catalyst were characterized by X-ray diffraction (XRD), brunner-emmet-teller (BET), transmission electron microscope (TEM) and High-resolution transmission electron microscopy (HRTEM). The characterized results showed that the catalyst has a high specific surface area, mesoporous structure and the mean size of Pt nanoparticles is 2.59 nm. Subsequently, the catalytic performance of Pt/CN catalyst for decline dehydrogenation was studied. Pt/CN catalyst exhibited excellent performance in decalin dehydrogenation with the conversion of decalin was 30.70%, and the selectivity of naphthalene was 90.86% at 200 ℃ for 150 minutes. When the reaction temperature increased to 210 ℃, the conversion of catalyst increased to 52.02%, and the selectivity of naphthalene reduced to 90.21%. The possible reason may be attributed to the difficulty in converting decalin to tetralin. This paper would provide a novel method for the synthesis of efficient dehydrogenation catalyst of decalin..

Synthesis, Characterization of Bimetallic V-Fe-SBA-15 and Its Catalytic Performance in the Hydroxylation of Phenol

2007 ◽  
Vol 7 (12) ◽  
pp. 4508-4514 ◽  
Author(s):  
Fei Gao ◽  
Yanhua Zhang ◽  
Chunling Wang ◽  
Cheng Wu ◽  
Yan Kong ◽  
...  
Keyword(s):  
Ph Value ◽  
High Surface ◽  
Mesoporous Structure ◽  
Catalytic Performance ◽  
Hydroxylation Of Phenol ◽  
Surface Areas ◽  
Hexagonal Arrangement ◽  
Ft Ir ◽  
Catalytic Performances

A series of V-Fe incorporated-SBA-15 has been synthesized by adjustment of the pH value of the gel mixtures and characterized by using XRD, N2-adsorption, ICP, FT-IR, Raman, and UV–vis techniques. Results indicated that all samples exhibited typical hexagonal arrangement of mesoporous structure with high surface areas and the heteroatoms were probably incorporated into the framework of SBA-15. Catalytic performances of the obtained materials were evaluated in the hydroxylation of phenol with H2O2, and the catalytic results revealed that the selectivity for catechol (CAT) and hydroquinone (HQ) could be controlled by adjusting the contents of V and Fe in the samples, and an appropriate nV/nFe mol ratio in SBA-15 could approach the optimal catalytic performance.

scholarly journals Immobilization of Phospholipase D on Silica-Coated Magnetic Nanoparticles for the Synthesis of Functional Phosphatidylserine

Catalysts ◽  
2019 ◽  
Vol 9 (4) ◽  
pp. 361 ◽  
Author(s):  
Qingqing Han ◽  
Haiyang Zhang ◽  
Jianan Sun ◽  
Zhen Liu ◽  
Wen-can Huang ◽  
...  
Keyword(s):  
Electron Microscope ◽  
Magnetic Nanoparticles ◽  
Phospholipase D ◽  
Physical Adsorption ◽  
Catalytic Reactions ◽  
Covalent Attachment ◽  
Synthesis Process ◽  
Transmission Electron ◽  
Ft Ir ◽  
Magnetic Nanoparticles Fe3o4

In this study, silica-coated magnetic nanoparticles (Fe3O4/SiO2) were synthesized and applied in the immobilization of phospholipase D (PLDa2) via physical adsorption and covalent attachment. The immobilized PLDa2 was applied in the synthesis of functional phosphatidylserine (PS) through a transphophatidylation reaction. The synthesis process and characterizations of the carriers were examined by scanning electron microscope (SEM), transmission electron microscope (TEM), and Fourier-transform infrared spectroscopy (FT-IR). The optimum immobilization conditions were evaluated, and the thermal and pH stability of immobilized and free PLDa2 were measured and compared. The tolerance to high temperature of immobilized PLDa2 increased remarkably by 10°C. Furthermore, the catalytic activity of the immobilized PLDa2 remained at 40% after eight recycles, which revealed that silica-coated magnetic nanoparticles have potential application for immobilization and catalytic reactions in a biphasic system.

Biotemplate Synthesis of Porous Ceria Fiber and Study on its Catalytic Performance

2013 ◽  
Vol 745-746 ◽  
pp. 491-498 ◽  
Author(s):  
Feng Chen ◽  
Cheng Bao Liu ◽  
Zhi Gang Chen
Keyword(s):  
Catalytic Performance ◽  
High Specific Surface Area ◽  
Nitrogen Absorption ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Hierarchical Porous ◽  
Bet Method ◽  
High Resolution Tem ◽  
Crystallite Diameter

Hierarchical porous ceria with nanocrystalline was successfully synthesized using filter paper as biotemplate. Unique biomorphic microstructures were characterized by Field Emission Scanning Electron Microscope (FESEM), transmission electron microscopy (TEM) and nitrogen absorption-desorption technique. The obtained ceria material showed the repetitious biomimetic structure consisting of fibre with diameter of ca. 1-3 μm and nanopores which had 2-4 nm apertures. The small crystallite diameter (6-8 nm) and the high specific surface area (71.3 m2·g-1) of porous CeO2 were measured by wide-angle X-ray Diffraction (XRD), high resolution TEM (HRTEM) and the BET method. While the concentration of acid fuchsine was 20 mg/L, the porous sample had a higher decoloring rate in a shorter time than others. The decoloring rate can reach 100% after 200 min.

Synthesis, Characterization and Catalytic Application of Mesoporous PW/SBA-15 for Epoxidation of α-Pinene

2012 ◽  
Vol 538-541 ◽  
pp. 2382-2386 ◽  
Author(s):  
Dan Dan Zhu ◽  
Chun Hua Wu ◽  
Chang Fu Zhuang ◽  
Guan Ben Du ◽  
Jia Yan Zhang
Keyword(s):  
Electron Micrographs ◽  
Hexagonal Structure ◽  
Scanning Electron Micrographs ◽  
The Novel ◽  
X Ray Diffraction ◽  
Hydrothermal Conditions ◽  
Catalytic Application ◽  
Transmission Electron ◽  
Ft Ir ◽  
High Degree

Supported phosphotungstic acid SBA-15 were synthesized under hydrothermal conditions and characterized by X-ray diffraction (XRD), N2 adsorption, transmission electron micrographs (TEM), scanning electron micrographs (SEM), Fourier-transform infrared spectroscopy (FT-IR). XRD and FT-IR results indicated that the substitution of tungsten occurs in the silicate framework structure of SBA-15. TEM and SEM investigations confirmed the presence of ordered high degree ordering hexagonal structure in the novel PW/SBA-15 material. Their catalytic activity was evaluated in the epoxidation of α-pinene. 2,3-epoxypinane was the main product. The results of epoxidation of α-pinene by PW(40)/SBA-15 were fellows: the conversion rate of α-pinene and the selectivity were 87.61% and 79.90% respectively.

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