The Experts below are selected from a list of 100851 Experts worldwide ranked by ideXlab platform

George A. Olah - One of the best experts on this subject based on the ideXlab platform.

G. K. Surya Prakash - One of the best experts on this subject based on the ideXlab platform.

Fengbao Zhang - One of the best experts on this subject based on the ideXlab platform.

  • sulfonated graphene as water tolerant solid Acid Catalyst
    Chemical Science, 2011
    Co-Authors: Junyi Ji, Guanghui Zhang, Hongyu Chen, Shulan Wang, Guoliang Zhang, Fengbao Zhang
    Abstract:

    Acid Catalysts are essential for various chemical reactions in the industrial hydrocarbon chemistry. Sulfonated carbon has shown promising application as a new, cheap and environmentally friendly solid Acid Catalyst. In this study, we prepared the sulfonated graphene Acid Catalyst, and it was characterized by electron microscopy, Raman spectroscopy, solid state 13C MAS NMR, energy dispersive spectroscopy (EDS) and X-ray photoelectron spectroscopy (XPS). Catalytic hydrolysis of ethyl acetate shows that the sulfonated graphene has highly catalytic activity and can be repetitively used as a water-tolerant solid Acid Catalyst.

  • Sulfonated graphene as water-tolerant solid Acid Catalyst
    Chemical Science, 2011
    Co-Authors: Guanghui Zhang, Hongyu Chen, Shulan Wang, Guoliang Zhang, Fengbao Zhang, Xiaobin Fan
    Abstract:

    Acid Catalysts are essential for various chemical reactions in the industrial hydrocarbon chemistry. Sulfonated carbon has shown promising application as a new, cheap and environmentally friendly solid Acid Catalyst. In this study, we prepared the sulfonated graphene Acid Catalyst, and it was characterized by electron microscopy, Raman spectroscopy, solid state 13C MAS NMR, energy dispersive spectroscopy (EDS) and X-ray photoelectron spectroscopy (XPS). Catalytic hydrolysis of ethyl acetate shows that the sulfonated graphene has highly catalytic activity and can be repetitively used as a water-tolerant solid Acid Catalyst.

Thomas Mathew - One of the best experts on this subject based on the ideXlab platform.

Mohamed Kheireddine Aroua - One of the best experts on this subject based on the ideXlab platform.

  • Esterification of Glycerol With Oleic Acid Over Hydrophobic Zirconia-Silica Acid Catalyst and Commercial Acid Catalyst: Optimization and Influence of Catalyst Acidity
    Frontiers in Chemistry, 2019
    Co-Authors: Pei San Kong, Patrick Cognet, Yolande Peres-lucchese, Wan Mohd Ashri Wan Daud, Mohamed Kheireddine Aroua
    Abstract:

    Catalytic esterification of glycerol with oleic Acid (OA) was optimized over hydrophobic mesoporous zirconia-silica heterogeneous Acid Catalyst (ZrO2-SiO2-Me&Et-PhSO3H) and benchmarked with commercial Catalysts (Aquivion and Amberlyst 15) in order to examine the effect of Catalyst Acidity on conversion, yield and product selectivity. The process optimisation results showed an 80% conversion with a 59.4% glycerol mono-oleate (GMO) and 34.6% glycerol dioleate (GDO) selectivities corresponding to a combined GMO and GDO selectivity of 94.8% at equimolar OA-to-glycerol ratio, 160°C reaction temperature, 5 wt% Catalyst concentration with respect to the OA weight and 4 h reaction time. This work reveals that the hydrophobic and mild Acidic ZrO2-SiO2-Me&Et-PhSO3H Catalyst outperformed Amberlyst 15 and Aquivion with a yield of 82% and GMO selectivity of 60%. It is found that Catalyst Acidity is a key parameter for catalytic activity and conversion rate. Nevertheless, high Acidity/Acid strength reduced the product yield in the glycerol esterification of OA.

  • Development of a Novel Hydrophobic ZrO2–SiO2 Based Acid Catalyst for Catalytic Esterification of Glycerol with Oleic Acid
    Industrial and engineering chemistry research, 2018
    Co-Authors: Pei San Kong, Patrick Cognet, Yolande Peres-lucchese, Jérôme Esvan, Wan Mohd Ashri Wan Daud, Mohamed Kheireddine Aroua
    Abstract:

    The inevitably low value of glycerol has led to extensive investigations on glycerol conversion to value-added derivatives. The esterification of glycerol with oleic Acid is currently a very important industrial process. In this work, a novel heterogeneous Acid Catalyst featuring hydrophobic surface is developed on modified ZrO2–SiO2 support as water-tolerant solid Acid Catalyst is vital for biphasic esterification reactions that produce water. The novel ZrO2–SiO2–Me&Et-PhSO3H Catalyst was prepared through silication and surface modification with trimethoxymethylsilane and 2-(4-chlorosulfonylphenyl)ethyltrimethoxysilane. This work showed that it is possible to control the Acidity and hydrophobicity of the Catalyst by tailoring the amount of surface modification agents. It was found that the hydrophobicity of the Catalyst decreased as its Acidity increased. Furthermore, at constant Catalyst Acidity, the more hydrophobic Catalyst showed a better yield.