Optimizing anti-coking abilities of zeolites by ethylene diamine tetraacetie acid modification on catalytic fast pyrolysis of corn stalk

Abstract

In order to minimize coke yield during biomass catalytic fast pyrolysis (CFP) process, ethylene diamine tetraacetie acid (EDTA) chemical modification method is carried out to selectively remove the external framework aluminum of HZSM-5 catalyst. X-ray diffraction (XRD), nitrogen (N 2)-adsorption and ammonia-temperature programmed desorption (NH 3-TPD) techniques are employed to investigate the porosity and acidity characteristics of original and modified HZSM-5 samples. Py-GC/MS and thermo-gravimetric analyzer (TGA) experiments are further conducted to explore the catalytic effect of modified HZSM-5 samples on biomass

Modification and regeneration of HZSM-5 catalyst in microwave assisted catalytic fast pyrolysis of mushroom waste

“…For this reason, ethylene diamine tetraacetic acid (EDTA) showed prevalent ability to remove the framework aluminums [19]. Simultaneously, compared to some other pyrolysis heating reactors, microwave assisted catalytic fast pyrolysis (MACFP) dominates a series superiorities for well-distributed of heat, easy operation and energy conservation, which has been extensively used and studied [20][21][22].…”

Reaction Kinetics and Coking Behavior for Furan Deoxygenation via Catalytic Pyrolysis Using Methane

“…The steady‐state behavior that is clearly visible at 500 °C after 45 minutes is likely due to the pore blocking by carbon. Heavy fouling can be seen with increasing temperature, where further carbon deposition takes place on the catalyst surface , . Studies have also indicated that when carbon continues to deposit it form whiskers and carries Ni to the top of the (catalyst's) stem .…”

Microwave-Assisted Catalytic Fast Pyrolysis of Biomass for Hydrocarbon Production with Physically Mixed MCM-41 and ZSM-5

“…Typified by a unique three-dimensional pore system with 10-member ring, ZSM-5 catalyst exhibited inside straight 0.53 × 0.56 nm channels linked to zigzag 0.51 × 0.55 nm channels. In the interim of biomass CFP, ZSM-5 catalyst retained the performance to adsorb oxygenated chemicals from biomass primary pyrolytic vapors in its confined pore channels and intersection cavities, along with assorted deoxygenation (e.g., dehydration, dehydroxylation, decarbonylation, and decarboxylation reactions) and isomerization responses to expel oxygen atoms as H 2 O, CO 2 and CO and produced hydrocarbons [18]. Furthermore, the pore diameter of ZSM-5 catalyst is obviously consistent with the dynamic diameters of benzene, toluene and xylene, so ZSM-5 catalyst exerts a prominent shape-selective catalytic influence on the formation of aromatic hydrocarbons during biomass CFP [15,28].…”

“…Laboriously, ZSM-5 catalyst applied in biomass CFP will receive detrimental coke formation on its external surface, generated from conspicuous acid-catalyzed polymerization of large molecules in biomass primary pyrolytic vapors [18]. As bulky molecules, coke formed and remained on the outer surface induces the defects of pore opening block and rapid deactivation of ZSM-5, thereby preventing its catalytic effect [19].…”