The in-situ effect of H2S on the decomposition of natural rubber and catalyst activity. (November 2021)

• Record Type: Journal Article
• Authors: Bei, Lei; Han, Yang; Qiao, Lei; Bikane, Kagiso; Yu, Jie; Sun, Lushi
• Is Part Of: Chemosphere. Volume 283(2021)
• Publication Date: 2021-11
• Subjects: Tire -- Zn -- ZSM -- Catalytic pyrolysis -- Desulfurization; Pollution -- Periodicals; Pollution -- Physiological effect -- Periodicals; Environmental sciences -- Periodicals; Atmospheric chemistry -- Periodicals; 551.511
• DOI: 10.1016/j.chemosphere.2021.131252
• Languages: English
• ISSNs: 0045-6535

Abstract

Abstract: In this work, the pyrolysis of natural rubber (NR) under N2 and H2 S atmosphere was performed to illustrate the possible effect of H2 S on NR decomposition with and without catalysts. A molecular dynamics simulation based on reactive force field (ReaxFF) was also conducted to understand the interaction mechanism between H2 S and intermediates from NR decomposition. Furthermore, the catalytic decomposition of NR under H2 S atmosphere and the adsorption characteristics of H2 S by zeolites alone were also carried out to investigate the effect of catalysts on sulfur behavior and the reversed effect of H2 S on catalyst activity. This work revealed that the introduction of H2 S can influence the yields of pyrolytic oil and gas, as well as composition of the oil. Combining experimental and simulation studies, H2 S can interact with intermediates from NR decomposition forming sulfur-containing substances in pyrolytic oil. The H2 S adsorption experiments by various catalysts revealed that catalysts can chemically adsorb H2 S. The introduction of Zn can promote the adsorption ability by reacting with sulfur-containing substances to generate ZnS, with the desulfurization effect following the order of 3Zn/ZSM5 > ZSM5 > 3ZnO/ZSM5. Highlights: H2 S participates in rubber pyrolysis and influence pyrolytic products yield. H2 S weakens active sites of catalysts and inhibits their cracking ability. ZSM5 reduces the sulfur content of oil by chemical adsorption. Zn/ZSM5 desulfurizes oil by combining sulfur-containing substances.