Effect of Si/Al Ratios on the Structure and Catalytic Properties of Alkaline-treated ZSM-5 Catalysts

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Important Dates

Conference:

Apr. 22-24, 2019

Full Paper Due: Mar. 18, 2019

Abstract Due: Mar. 18, 2019

Audience Registration Due:
Apr. 22, 2019

Presentations of The Spring World Congress on Engineering and Technology (SCET 2017)

● Effect of Si/Al Ratios on the Structure and Catalytic Properties of Alkaline-treated ZSM-5 Catalysts
Author(s)
Cai-Wu Luo
Affiliation(s)
University of South China
KEYWORDS
Si/Al Ratios, Structure, Catalytic Properties, Alkaline-treated ZSM-5 Catalysts
ABSTRACT
a series of hierarchical HZSM-5 catalysts with different Si/Al ratios (Si/Al = 25, 38, 50) were synthesized by alkaline (denoted as HZSM-5-At) and/or alkaline-acid (denoted as ZnO/HZSM-5-At-acid) sequential treatments, and they as catalyst pairs were employed for the synthesis of glycerol and ammonia toward pyridine bases in a series-connected two-stage reactor. The characterization was analysed by means of N2-physorption and NH3-TPD techniques. The catalytic evaluation showed that the lower Si/Al ratio (Si/Al = 25) in catalyst pairs (HZSM-5-At + ZnO/HZSM-5-At-acid) possesed the highest total yield of pyridine bases among all the catalyst pairs, but the suitable Si/Al ratio in ZSM-5 (Si/Al = 38) in the first stage reactor had the stronger stability relative to other catalyst pairs. The characterization revealed that the amount of acid sites play a vital role in the total yield of pyridine bases whereas the appearance of mesoporous structure and the declined concentration of acid sites were main reasons for promoting the stability.