Catalytic conversion of beech wood pyrolytic vapors

Abstract

Catalytic fast pyrolysis (CFP) of beech wood chips was undertaken in a laboratory-scale fixed bed reactor equipped with a biomass semi-continuous dispenser. During pyrolysis, chars are retained on a quartz frit and the pyrolytic vapors are entrained through a fixed-bed catalyst to be converted. Several acidic catalysts such as zeolites H-Beta, zeolite HMFI and 5% Ni supported on HMFI were screened in this equipment. The Ni/HMFI catalyst was also tested in the presence of 1 vol.% of hydrogen in the feed stream. Mass and carbon balances were carefully checked and the gas, liquids and solids fractions were analyzed in-depth to evaluate the impact of the catalyst compared to thermal conversion. In the presence of a catalyst, with a low catalyst-to-biomass ratio of 0.1, a lower amount of bio-oil was formed but it contained less oxygen. The bio-oils were characterized by bidimensional GC (GCxGC) coupled with MS and FID detectors. The amount of gaseous products also increased in the presence of all catalysts. In addition of the deoxygenation, gel-permeation chromatography (GPC) showed a decrease of the highest molecular masses in the bio-oil after catalytic treatment, which confirms the conversion of some oligomers. The presence of Ni enhanced the deoxygenation reactions while the addition of H 2 is also beneficial to the bio-oil composition.

Catalytic Fast Pyrolysis of Kraft Lignin With Conventional, Mesoporous and Nanosized ZSM-5 Zeolite for the Production of Alkyl-Phenols and Aromatics

“…The use of all three ZSM-5 zeolite catalysts induced the production of ethane, ethylene, propane and propylene which were not produced by the non-catalytic pyrolysis. The production of these gases is indicative of enhanced cracking and dealkylation reactions catalyzed by ZSM-5 in accordance with its performance in biomass fast pyrolysis (Mullen and Boateng, 2010 ; Stephanidis et al, 2011 ; Wang et al, 2014 ; Margeriat et al, 2018 ). As discussed below, ethylene and propylene serve as precursors for the production of aromatics in the channels of ZSM-5.…”

Can Paints and Varnish Impair the Physicochemical Properties of Wood Pyrolysis Oils?

“…Energy & Fuels A labscale pyrolytic setup already described previously 10 was used. The wood chips were dried at 110 °C for 1.5 h before being placed in a gastight hopper and kept under N 2 .…”

“…Numerous studies investigated the effect of different parameters of pyrolysis, such as the temperature, heating rate, particle size, reactor configuration, residence time, and presence and properties of catalysts; − other works reported the impact of mixing the wood with different materials, such as plastics, agricultural residues, and municipal solid waste. − The pyrolysis of demolition wood in a fluidized bed reactor has been mentioned as early as 2005, but the authors reported mostly experiments using pristine woods (pine, beech, and bamboo) and only experiment using demolition wood, which was simply compared in terms of liquid and char yields. Hwang et al carried out the pyrolysis of different municipal solid wastes, including wood chips (obtained from construction and demolition waste) and mixtures of paper/wood/plastics, at 500, 700, and 900 °C, the highest temperatures more closely related to gasification conditions.…”

Two-Dimensional Gas Chromatography Characterization of Pyrolysis Bio-oils: A Review

“…This trend was even more significant for Ni catalysts. The amount of alkylphenols was independent of the presence or absence of a catalyst …”

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