Highly basic CaO nanoparticles in mesoporous carbon materials and their excellent catalytic activity.
Highly basic CaO nanoparticles immobilized mesoporous carbon materials (CaO-CMK-3) with different pore diameters have been successfully prepared by using wet-impregnation method. The prepared materials were subjected to extensive characterization studies using sophisticated techniques such as XRD, nitrogen adsorption, HRSEM-EDX, HRTEM and temperature programmed desorption of CO2 (TPD of CO2). The physico-chemical characterization results revealed that these materials possess highly dispersed CaO nanoparticles, excellent nanopores with well-ordered structure, high specific surface area, large specific pore volume, pore diameter and very high basicity. We have also demonstrated that the basicity of the CaO-CMK-3 samples can be controlled by simply varying the amount of CaO loading and pore diameter of the carbon support. The basic catalytic performance of the samples was investigated in the base-catalyzed transesterification of ethylacetoacetate by aryl, aliphatic and cyclic primary alcohols. CMK-3 catalyst with higher CaO loading and larger pore diameter was found to be highly active with higher conversion within a very short reaction time. The activity of 30% CaO-CMK3-150 catalyst for transesterification of ethylacetoacetate using different alcohols increases in the following order: octanol > butanol > cyclohexanol > benzyl alcohol > furfuryl alcohol.
Centre for Nanoscience and Technology, Anna University, Chennai 600025, India.
Pradeep Kumar
PK
Raja
Anand
A
Chokkalingam
Subramaniam V
SV
Priya
Veerappan V
VV
Balasubramanian
Mercy R
MR
Benziger
Salem S
SS
Aldeyab
Ramasamy
R
Jayavell
Katsukiho
K
Ariga
Ajayan
A
Vinu
D000042:Absorption; D017610:Calcium Compounds / Q000737:chemistry*; D002244:Carbon / Q000737:chemistry*; D002384:Catalysis; D003460:Crystallization / Q000379:methods*; D006863:Hydrogen-Ion Concentration; D046911:Macromolecular Substances / Q000737:chemistry; D008422:Materials Testing; D008968:Molecular Conformation; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure*; D010087:Oxides / Q000737:chemistry*; D010316:Particle Size; D016062:Porosity; D013499:Surface Properties
D017610:Calcium Compounds; D046911:Macromolecular Substances; D010087:Oxides; D002244:Carbon; C016538:lime