Hydrodesulphurization activity and coking propensity of carbon and alumina supported catalysts

Evaluating the potential of CNT-supported Co catalyst used for gas pollution removal in the incineration flue gas

“…The results of previous studies (De Beer et al, 1984;Lu and Wey, 2007a) indicate that Co/CNT catalyst had good thermal stabilization during oxidation. Therefore, the cracking of hydrocarbons or fly ash tended to be deposited on the catalyst, which covered the active sites and lowered the activity of the catalyst.…”

“…Flue gas contains a large amount of moisture and fine particles such as fly ash and easily causes deactivation of the catalyst. De Beer et al (1984) studied the thiophene HDS reaction and found that carbonaceous residues are deposited on the surface of the catalyst with side reactions (cracking of hydrocarbons). Coke or carbon may deactivate the catalyst by physically covering the active site and blocking the pores of the catalyst.…”

Hierarchical Hybrid Supports and Synthesis Strategies for Hydrodesulfurization of Recalcitrance Organosulfur Compounds

“…[37,[81][82][83] However, their characteristics microporous disordered pore structure and low specific pore volume have hindered their applicability for heavier organosulfur molecules that required large pores for diffusion of reactants and products during the reaction. [37] The hybrid HDS supported catalysts on different carbon-based zeolitic composites have been investigated. [84][85][86][87] In a view to bring dynamic functionalities to HDS support that will ultimately improve their catalytic efficiency, carbon-based materials have been mixed/prepared with zeolites in the recent times.…”

“…[35,36] The main problem of carbon-based support is the microporosity nature with disordered porous structure, that is not suitable for large molecules in heterogeneous catalysis due to mass and heat transfer limitations. [37] Therefore, it is important to explore the various characteristics of hybrid supports to compensate for deficiency in the physicochemical properties of the individual support, in order to improve and control the dispersion of the active phase and degree of dispersion through effective metal support interaction (MSI). Metal-support interaction has been reported weakened to provide hydrogenation sites for active metals through binary mixed supports such as SiO 2 -Al 2 O 3 , [38] TiO 2 -Al 2 O 3 [39] ZrO 2 -Al 2 O 3 [40] and TiO 2 -SiO 2 .…”

Effects of surface and structural properties of carbons on the behavior of carbon-supported molybdenum catalysts

“…The apparatus was the same as the one used for carbon deposition by de Beer et al (15), with calibrated CO and CO2 infrared detectors (Beckman, Model 865) added to it to analyze the effluent gases. The carbon support (-80 mg) was held for 2-3 h at 50°C in N2 (60 cm 3 (STP) rain 1) until a steady baseline was obtained.…”