High yield production of HMF from carbohydrates over silica–alumina composite catalysts

2016 ◽  
Vol 6 (20) ◽  
pp. 7586-7596 ◽  
Author(s):  
Xiangcheng Li ◽  
Qineng Xia ◽  
Van Chuc Nguyen ◽  
Kaihao Peng ◽  
Xiaohui Liu ◽  
...  
Keyword(s):  
Sol Gel ◽  
High Yield ◽  
Efficient Production ◽  
Gel Method ◽  
Sol Gel Method ◽  
Composite Catalysts ◽  
Yield Production ◽  
Silica Alumina ◽  
Alumina Composite ◽  
High Yield Production

Mesoporous AlSiO catalysts have been prepared by a facile sol–gel method with tunable acidity for highly efficient production of HMF.

Visible light photodegradation of phenol on MWNT-TiO2 composite catalysts prepared by a modified sol–gel method

2005 ◽  
Vol 235 (1-2) ◽  
pp. 194-199 ◽  
Author(s):  
Wendong Wang ◽  
Philippe Serp ◽  
Philippe Kalck ◽  
Joaquim Luís Faria
Keyword(s):  
Visible Light ◽  
Sol Gel ◽  
Gel Method ◽  
Sol Gel Method ◽  
Composite Catalysts

A Comparison of Different Preparation Methods of Fe-Mo-Mg-O Catalyst for the Large-Scale Synthesis of Carbon Nanotubes

2006 ◽  
Vol 510-511 ◽  
pp. 66-69 ◽  
Author(s):  
Yan Fang Chen ◽  
Yun Soo Lim
Keyword(s):  
Carbon Nanotubes ◽  
Large Scale ◽  
Sol Gel ◽  
High Yield ◽  
Preparation Methods ◽  
Gel Method ◽  
Sol Gel Method ◽  
Large Scale Synthesis ◽  
Synthesis Of Carbon Nanotubes ◽  
Reaction Routes

Carbon nanotubes (CNTs) in a high yield were synthesized by the decomposition of the methane gas with CCVD, in which two different reaction routes of sol-gel method prepared Fe-Mo- Mg-O catalyst. The two different routs influenced the wall number and defects of CNTs and the formation of CNTs. The concentration of Mo in the catalyst played a very important role in the yield of CNTs.

scholarly journals Mixed Metal Oxides of M1 MoVNbTeOx and TiO2 as Composite Catalyst for Oxidative Dehydrogenation of Ethane

Catalysts ◽  
2022 ◽  
Vol 12 (1) ◽  
pp. 71
Author(s):  
Yuxin Chen ◽  
Dan Dang ◽  
Binhang Yan ◽  
Yi Cheng
Keyword(s):  
Metal Oxides ◽  
Oxidative Dehydrogenation ◽  
Sol Gel ◽  
Catalytic Performance ◽  
Mixed Metal Oxides ◽  
Gel Method ◽  
Mixed Metal ◽  
Sol Gel Method ◽  
Composite Catalysts ◽  
Oxidative Dehydrogenation Of Ethane

Composite catalysts of mixed metal oxides were prepared by mixing a phase-pure M1 MoVNbTeOx with anatase-phase TiO2. Two methods were used to prepare the composite catalysts (the simple physically mixed or sol-gel method) for the improvement of the catalytic performance in the oxidative dehydrogenation of ethane (ODHE) process. The results showed that TiO2 particles with a smaller particle size were well dispersed on the M1 surface for the sol-gel method, which presented an excellent activity for ODHE. At the same operating condition (i.e., the contact time of 7.55 gcat·h/molC2H6 and the reaction temperature of 400 °C), the M1-TiO2-SM and M1-TiO2-PM achieved the space time yields of 0.67 and 0.52 kgC2H4/kgcat/h, respectively, which were about ~76% and ~35% more than that of M1 catalyst (0.38 kgC2H4/kgcat/h), respectively. The BET, ICP, XRD, TEM, SEM, H2-TPR, C2H6-TPSR, and XPS techniques were applied to characterize the catalysts. It was noted that the introduction of TiO2 raised the V5+ abundance on the catalyst surface as well as the reactivity of active oxygen species, which made contribution to the promotion of the catalytic performance. The surface morphology and crystal structure of used catalysts of either M1-TiO2-SM or M1-TiO2-PM remained stable as each fresh catalyst after 24 h time-on-stream tests.

Nanocrystalline CNT-TiO2 Composites Produced by an Acid Catalyzed Sol-Gel Method

2008 ◽  
Vol 587-588 ◽  
pp. 849-853 ◽  
Author(s):  
Cláudia G. Silva ◽  
Wen Dong Wang ◽  
Joaquim L. Faria
Keyword(s):  
Carbon Nanotube ◽  
Sol Gel ◽  
Pure Tio2 ◽  
Absorption Properties ◽  
Interphase Interaction ◽  
Gel Method ◽  
Sol Gel Method ◽  
Composite Catalysts ◽  
Acid Catalyzed

Carbon nanotube-TiO2 composites and pure TiO2 are prepared by a modified sol-gel method. The nanoscaled materials obtained are extensively characterized by spectroscopic, microscopic and calorimetric techniques. Their photoactivity is tested in the degradation of phenol under visible illumination. A correlation between the CNT content and the changes in the UV–vis absorption properties was found. The effect induced by CNT on the composite catalysts is explained in terms of an interphase interaction between CNT and TiO2 in the composite catalysts.

A novel approach to formulate high flux multifunctional ultrafiltration membranes from photocatalytic titania composite precursors on multi-channel tubular substrates

RSC Advances ◽  
2016 ◽  
Vol 6 (63) ◽  
pp. 58813-58822 ◽  
Author(s):  
K. A. Manjumol ◽  
S. Sankar ◽  
Balagopal N. Nair ◽  
M. Midhun ◽  
Peer A. Mohamed ◽  
...  
Keyword(s):  
Titanium Dioxide ◽  
Sol Gel ◽  
High Flux ◽  
Ultrafiltration Membranes ◽  
Gel Method ◽  
Sol Gel Method ◽  
Novel Approach ◽  
Alumina Composite ◽  
Tubular Alumina

Anatase rich titanium dioxide ultrafiltration membranes with high filtration rates have been successfully developed on multi-channel tubular alumina substrates via aqueous sol–gel method from titania–alumina composite precursors.

Preparation and characterization of nickel based catalysts on silica, alumina and titania obtained by sol–gel method

2006 ◽  
Vol 352 (32-35) ◽  
pp. 3697-3704 ◽  
Author(s):  
G. Gonçalves ◽  
M.K. Lenzi ◽  
O.A.A. Santos ◽  
L.M.M. Jorge
Keyword(s):  
Sol Gel ◽  
Gel Method ◽  
Sol Gel Method ◽  
Silica Alumina
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