Selective Hydrogenation of α,β-Unsaturated Aldehydes on Ru-Sn/TiO2 Catalysts

2003 ◽  
Vol 68 (10) ◽  
pp. 1927-1936 ◽  
Author(s):  
Jana Špringerová ◽  
Petr Kačer ◽  
Jan Hájek ◽  
Libor Červený
Keyword(s):  
Catalytic Activity ◽  
Catalytic System ◽  
Catalytic Hydrogenation ◽  
Selective Hydrogenation ◽  
Carbonyl Compounds ◽  
Sol Gel ◽  
Positive Influence ◽  
Gel Method ◽  
Unsaturated Ketones ◽  
Unsaturated Aldehydes

Selective catalytic hydrogenation of unsaturated carbonyl compounds was studied on bimetallic Ru-Sn/TiO2 catalysts. The catalysts were prepared by a sol-gel method and co-impregnation in order to evaluate selected parameters (amount of the modifying tin, TiO2 support - commercial, standard sol-gel, modified sol-gel) on their catalytic activity and selectivity. Significant tin effect was proved especially with regard to the positive influence on selectivity. Sol-gel modified TiO2 was found to be the optimum support. Furthermore, the effect of substrate was studied. The suitability of the catalytic system for hydrogenation of unsaturated aldehydes was proved but it is not suitable for selective hydrogenation of unsaturated ketones.

Insights into the role of strontium in toluene catalytic combustion over La1-xSrxCoO3 perovskites catalysts

2022 ◽  
Author(s):  
Mo Liu ◽  
Xiaoli Yang ◽  
ZiMeng Tian ◽  
Huimin Wang ◽  
Liangtao Yin ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Catalytic Combustion ◽  
Sol Gel ◽  
Gel Method ◽  
Sol Gel Method ◽  
A Site

A series of LaCoO3 pervoskite catalysts substituted by Sr in A site (La1-xSrxCoO3) were prepared via a facile sol-gel method. The catalytic activity of these pervoskite catalysts for the deep...

BiOCl/TiO2 composite photocatalysts synthesized by the sol–gel method for enhanced visible-light catalytic activity toward methyl orange

2020 ◽  
Vol 35 (22) ◽  
pp. 3067-3078
Author(s):  
Xiaofei Qu ◽  
Xiaohui Zhao ◽  
Meihua Liu ◽  
Zhaoqun Gao ◽  
Donglin Yang ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Methyl Orange ◽  
Visible Light ◽  
Sol Gel ◽  
Gel Method ◽  
Sol Gel Method ◽  
Composite Photocatalysts

Abstract

Controlled synthesis and enhanced photoelectro-catalytic activity of a 3D TiO2 nanotube array/TiO2 nanoparticle heterojunction using a combined dielectrophoresis/sol–gel method

2019 ◽  
Vol 7 (17) ◽  
pp. 4981-4987 ◽  
Author(s):  
Ruiyu Bao ◽  
Chen Chen ◽  
Jianxin Xia ◽  
Huiying Chen ◽  
Hua Li
Keyword(s):  
Particle Size ◽  
Catalytic Activity ◽  
Surface Morphology ◽  
Sol Gel ◽  
Tio2 Nanoparticle ◽  
Controlled Synthesis ◽  
Tio2 Nanotube Array ◽  
Nanotube Array ◽  
Gel Method ◽  
Sol Gel Method

The surface morphology and particle size of materials can be controlled using DEP technology.

Characterization of sulfated TiO2 prepared by the sol–gel method and its catalytic activity in the n-hexane isomerization reaction

2005 ◽  
Vol 225 (1) ◽  
pp. 39-46 ◽  
Author(s):  
Lúcia K. Noda ◽  
Rusiene M. de Almeida ◽  
Luiz Fernando D. Probst ◽  
Norberto S. Gonçalves
Keyword(s):  
Catalytic Activity ◽  
Sol Gel ◽  
Isomerization Reaction ◽  
Gel Method ◽  
Sol Gel Method ◽  
Sulfated Tio2

Novel optical and magnetic properties of Li-doped quasi-2D manganate Ca3Mn2O7 particles

2017 ◽  
Vol 5 (28) ◽  
pp. 7011-7019 ◽  
Author(s):  
Xiongnan Zhang ◽  
Weifang Liu ◽  
Yuling Han ◽  
Cong Huang ◽  
Ping Wu ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Sol Gel ◽  
Positive Influence ◽  
Gel Method ◽  
Sol Gel Method ◽  
Li Doping ◽  
System P ◽  
Optical And Magnetic Properties

Ruddlesden–Popper (RP) structural Li2xCa3−2xMn2O7 (x = 0–0.05) particles were successfully synthesized via a citrate sol–gel method. Li doping was investigated to have a positive influence on enhancing the magnetism of the system.

Nanometer SrTiO3-Supported Ni-Based Catalyst in the Reaction of CO2 Reforming CH4 to Syngas

2010 ◽  
Vol 105-106 ◽  
pp. 819-822
Author(s):  
Chun Feng Wang ◽  
Hua Zhi Gu ◽  
Hao Chen
Keyword(s):  
Catalytic Activity ◽  
Sol Gel ◽  
Impregnation Method ◽  
Co2 Reforming ◽  
Gel Method ◽  
Sol Gel Method ◽  
Citrate Process ◽  
Lower Temperature ◽  
Supported Ni ◽  
Xrd And Tem

Superfine nanometer SrTiO3 with size of near 50-60nm was prepared by citrate process and sol-gel method. XRD and TEM characterizations indicate that sol-gel method is appropriate to prepare high-purity powders at far lower temperature than other methods. The Ni-based catalysts were prepared by using SrTiO3 powder as support through impregnation and sol-gel method. These catalysts were applied to the reaction of CO2 reforming CH4 to synas and showed high activity. The catalytic activity of Ni-based catalyst is investigated by reaction temperature, the method of support preparation, and the method of catalyst preparation; It shows that the catalyst possesses higher catalytic activity with the increasing of temperature; and the catalytic rate is near 90% at 973 K; and the catalyst show higher catalytic activity when support is prepared by sol-gel method than by citrate process; and the catalyst shows better catalytic activity when catalyst is prepared by sol-gel method than by impregnation method.

Effects of Promoters on Properties of Cu-Zn-Al Catalyst for Selective Hydrogenation of Cinnamaldehyde to Cinnamyl Alcohol

2011 ◽  
Vol 393-395 ◽  
pp. 1185-1188
Author(s):  
Chang You Li ◽  
Xiao Yan Li ◽  
Yi Fei Guo
Keyword(s):  
Catalytic Activity ◽  
Reaction Time ◽  
Catalytic Hydrogenation ◽  
Selective Hydrogenation ◽  
Reaction Rate ◽  
Steric Effect ◽  
Cinnamyl Alcohol ◽  
Active Centers ◽  
Hydrogenation Activity

Cu-Zn-Al catalyst was modified by the additives such as Ni and Mn, and the prepared catalyst was employed in the selective catalytic hydrogenation of cinnamaldehyde. The results showed that the addition of Ni could improve catalytic activity significantly, moreover, the improving effect was highest when Zn was replaced by Ni, simultaneously leading to excessive hydrogenation. The Cu-(5%)Mn-Zn-Al catalyst exhibited a higher selectivity of 93.6% for C = O bond to cinnamyl alcohol and hydrogenation activity of 33.0% conversion at 130°C under 1.0 MPa of H2 pressure with the reaction time of 1 h. TPR and XRD characterization showed that Mn promoter was favorable for the growth of Cu0 fine grains on the surface of catalyst, which not only led to steric effect which improved the selectivity for cinnamyl alcohol, but also reduced the numbers of active centers, consequently decreased the reaction rate.

Nickel-based xerogel catalysts: Synthesis via fast sol-gel method and application in catalytic hydrogenation of p -nitrophenol to p -aminophenol

2016 ◽  
Vol 382 ◽  
pp. 135-143 ◽  
Author(s):  
Jin Feng ◽  
Qiang Wang ◽  
Dongliang Fan ◽  
Lirong Ma ◽  
Deli Jiang ◽  
...  
Keyword(s):  
Catalytic Hydrogenation ◽  
Sol Gel ◽  
Gel Method ◽  
Sol Gel Method
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