Modification of natural clinoptilolite and ZSM-5 with different oxides and studying of the obtained products in lignin pyrolysis
In this work, different metal oxides (MO) supported on two types of zeolites: 1) natural clinoptilolite (NZ) and 2) synthetic zeolite, ZSM-5 were prepared and tested as catalysts in the fast pyrolysis of hardwood lignin. NZ was modified with the CaO and MgO by a simple two steps procedure c...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Serbian Chemical Society
2015-01-01
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| Series: | Journal of the Serbian Chemical Society |
| Subjects: | |
| Online Access: | http://www.doiserbia.nb.rs/img/doi/0352-5139/2015/0352-51391400109M.pdf |
| Summary: | In this work, different metal oxides (MO) supported on two types of zeolites:
1) natural clinoptilolite (NZ) and 2) synthetic zeolite, ZSM-5 were prepared
and tested as catalysts in the fast pyrolysis of hardwood lignin. NZ was
modified with the CaO and MgO by a simple two steps procedure consisting of
an ion exchange reaction and a subsequent calcination at 773 K. The synthetic
ZSM-5 was modified with several MO species (Ni, Cu, Ca, Mg) by a wet
impregnation and calcination at 873 K. Тhe prepared catalysts were
characterized by X-ray diffraction analysis (XRD), scanning electron
microscopy and energy dispersive X-ray analysis (SEM/EDS) and measurement of
specific surface area (BET method). Acid sites were characterized and
quantified by pyridine (py) absorption using Fourier transform infrared
spectroscopy (FTIR). The catalysts exhibit catalytic activity depanding on
modification, reaction temperature and of the MO contents. The highest yield
of useful phenol in bio-oil was obtained with NiO/ZSM-5 (34.8 wt.%) which
exhibits the highest specific surface area and the highest concetration of
Brönsted and Lewis acid sites. The studied catalysts did not increase
significantly the content of polycyclic aromatic hydrocarbons (PAHs) and
heavy compounds compared to non-catalytic experiment. [Projekat Ministarstva
nauke Republike Srbije, br. 172018] |
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| ISSN: | 0352-5139 1820-7421 |