High Catalytic Activity of Nitrogen-Containing Carbon from Molecular Sieves in Fine Chemistry

Abstract

Nanostructured nitrogen-containing carbon (CNs) were prepared by nanocasting techniques using MCM-41, MCM-22, and FAU molecular sieves. The surface and morphological features of CN were investigated by XRD, SEM, Raman spectroscopy, FTIR, XPS, and N 2 adsorption isotherms. The catalytic activity in a fine chemistry reaction was also evaluated. The amine-functionalized carbon materials studied are potentially of great importance because of their textural features and high catalytic performance towards Knoevenaguel condensation. In addition, variation of the structure of the molecular sieve material from FAU to MCM-41 led to an increase in the conversion from 23 to 80%. This may be correlated to the basic active sites upon incorporation of nitrogen and also an organized CN that provides active, selective, and stable catalysts to the target reaction. The re-use of the MCM-41-CN does not affect the selectivity of the desired product.

Synthesis of two-dimensional mesoporous carbon nitride under different carbonization temperatures and investigation of its catalytic properties in Knoevenagel condensations

“…The presence of the D band is characteristic of some disordered graphitic carbons in the walls of material. 22,39 Fig. 7 shows that the intensity of the G band is higher than that of the D band (I D / I G ¼ 0.83), evidencing a high graphitization degree in the MCM-1-400 structure.…”

“…38 Fig. 22,39 Fig. Two intense bands were observed at 1371 cm À1 and 1575 cm À1 , which are ascribed to the D (disordered) and G (graphitic) bands of the sp 2 -based carbon.…”

“…21 This reaction is a practical way to attain ne chemical intermediates and therapeutic and pharmacological products. [22][23][24] It is generally catalyzed by homogenous bases such as ammonia, ammonium salts, pyridine, and primary and secondary amines. 25,26 Although these catalysts show high catalytic activity, the thorny issues associated with the separation and recycling of the catalysts cannot meet the increasing demand on green and sustainable chemical industry.…”

Modulating the porosity of carbons for improved adsorption of hydrogen, carbon dioxide, and methane: a review

“…The most commonly used liquid monomer is furfuryl alcohol (FA), 88,174,[178][179][180][181][182] due to its ease of insertion into pores. 34 However other monomers such as acrylonitrile, 174 saccharides, 183,184 and ethylene diamine 185 have also been studied as precursors. ZTCs derived via liquid impregnation (LI) typically poorly replicate the zeolite structure (resulting in a type-III structure) as it is difficult to insert sufficient precursor into the pores.…”

Improving ORR activity of carbon nanotubes by hydrothermal carbon deposition method

“…Carbon materials, which possess various merits of high conductivity, excellent mechanical and chemical stability and easily surface-functionalization, have been applied to many fields [13][14][15][16][17][18] . To be specific, they not only can serve as a kind of supports to homogeneously disperse metal nanoparticles, accordingly enhancing the catalytical activity [19][20][21][22] ; but also act alone as the active components applied to heterogeneous catalysis [13][14][15][16][17][18][23][24][25][26] . Since Dai group [18] found nitrogen-doped carbon nanotubes (NCNTs) displayed outstanding performance toward ORR in 2009, heteroatoms-doped carbon materials as metal-free ORR electrocatalysts have been studied extensively, which are regarded as one kind of the most potential alternatives to Pt-based catalysts [27][28][29][30][31][32][33] .…”