Fluidity enhancement of hard-to-fluidize nanoparticles by mixing with hydrophilic nanosilica and fluid catalytic cracking particles: Experimental and theoretical study

Abstract

As a low-cost method, hydrophilic SiO2 nanoparticles (NPs) and fluid catalytic cracking (FCC) coarse particles were used as assistant materials to improve the fluidity of Al2O3 and TiO2 hard-to-fluidize nanopowders. To decrease the strong electrostatic forces between the hydrophilic nanopowders, prepared samples were fluidized in the presence of methanol vapor. Results revealed that the amount of SiO2 NPs, increased from 5 to 50 wt. %, has a beneficial effect on the fluidization quality of the binary (hard-to-fluidize NPs + SiO2) and ternary (hard-to-fluidize NPs + SiO2 + FCC) mixtures. However, the amount of FCC particles when it varied from 15 to 30 wt. % in the ternary mixtures should meet the optimal point, beyond which the fluidization quality was declined due to the segregation phenomenon. The laboratory results showed that the cost-effective ternary samples fluidized more homogeneously with higher bed expansions compared to the binary samples. In this regard, (Al2O3 + 20 wt. % SiO2) + 15 wt. % FCC and (TiO2 + 20 wt. % SiO2) + 15 wt. % FCC ternary samples were proposed as the alternatives of Al2O3 + 50 wt. % SiO2 and TiO2 + 50 wt. % SiO2 binary mixtures, respectively.

Theoretical and experimental study on the fluidity performance of hard-to-fluidize carbon nanotubes-based CO2 capture sorbents

“…2(c), are distributed between the CNTs. It can be inferred that strong electrostatic forces of attraction developed at the contact points between the SiO 2 NPs and CNT particles due to contact charging [19,20,23,25,26]. The easy-fluidizable SiO 2 NPs become carriers of the CNT particles, which improves the fluidity behavior.…”

“…The NPs with better fluidization behavior, such as hydrophobic silica, are the most common auxiliary additives to enhance the fluidization ability of hard-to-fluidized NPs [20]. By adding the optimized amounts of the mentioned assistant materials, U mf will decrease while the bed expansion increases [19,20,23,[25][26][27].…”

CO2 capture activity of a novel CaO adsorbent stabilized with (ZrO2+Al2O3+CeO2)-based additive under mild and realistic calcium looping conditions

“…However, the fluidization of CaO adsorbents (in fine and pellet scales) in fluidized bed reactor under realistic conditions has not been comprehensively investigated yet. Previous studies have reported the heterogeneous fluidity quality of fine CaO particles in fluidized bed due to the nature of CaO, a subset of Geldart C group materials [92][93][94], even though several internal methods have been proposed to improve CaO-based particle fluidity at lab-scale experiments [48,49,95,96]. It is north worthy that, in addition to promising cyclic activity and morphological properties, the complete fluidization of CaO adsorbents is required to employ the CaL process in practical and industrial applications.…”

An Evaluation of Catalyst Applications in Bio-Oil Upgrading and Biomass Pyrolysis

“…In order to minimize the deposition of carbon and enhance the lifecycle of catalysts, it may become necessary to develop unique methods of changing the ZSM-5 zeolites surface elements. According to Tahmasebpoor, Rahimvandi Noupoor, and Badamchizadeh [2], it is hoped that the inclusion of metals similar to those used in fluid catalytic cracking (FCC) catalysts would be effective. Synthesis and use of certain mix crystal zeolites with unique features in the petroleum refinery may shed light on the possibility of bio-oil catalytic cracking.…”