Monolithic HZSM-5/SS-fiber catalysts with high coke-resistance and selectivity for catalytic cracking of castor oil to produce biofuel

Qiaofei Zhang, Qi Han, Hongjuan Bai, Yakun Li, Chunshan Zhu and Wenlei Xie

Renewable Energy, 2024, vol. 229, issue C

Abstract: Monolithic HZSM-5/SS-fiber catalysts with hierarchical porous structure from micro-to macro-size for catalytic cracking of castor oil to produce biofuel were fabricated by seed coating and subsequent hydrothermal synthesis of ZSM-5 zeolite crystals onto the thin-sheet stainless steel fiber (SS-fiber). Compared with the powdered HZSM-5, the HZSM-5/SS-fiber catalyst exhibited high hydrocarbon selectivity (78% in gasoline and 57% in diesel) with enhanced physical properties of liquid products, as well as excellent coke-resistance with coking rate of 0.47 mg gzeolite−1 h−1 (one-eighth of the powdered HZSM-5), indicating a significant intensification on cracking process due to a unique combination of high heat/mass transfer and hierarchical pore structure. SiO2/Al2O3 ratio exerts a pivotal influence on HZSM-5 loading and acid strength/amount of the HZSM-5/SS-fiber, which thereby strongly relates to the degree of cracking, aromatization, and deoxygenation. The HZSM-5/SS-fiber (200) with moderate acid amount and strength permitted mild secondary cracking and sufficient deoxygenation reactions, resulting in a low coke yield, a high liquid product yield and a high hydrocarbon/aromatic selectivity along with reduced acid values (7.4 mg KOH g−1 in gasoline and 83.2 mg KOH g−1 in diesel). The physical properties including kinematic viscosity, density, oxygen content and heating value, were optimal at SiO2/Al2O3 ratio of 200.

Keywords: Monolithic catalysts; Biofuel; Catalytic cracking; HZSM-5; Deoxygenation; Castor oil (search for similar items in EconPapers)
Date: 2024
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Persistent link: https://EconPapers.repec.org/RePEc:eee:renene:v:229:y:2024:i:c:s0960148124008231

DOI: 10.1016/j.renene.2024.120755

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