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From Glucose-Based Carbohydrates to Phenol-rich Bio-oil Integrated with Syngas Production via Catalytic Pyrolysis over Activated Carbon Catalyst

Abstract

The catalytic pyrolysis of carbohydrates over phosphoric acid-activated carbon catalyst (ACC) was investigated to obtain phenol-rich bio-oil and syngas production in a facile fixed-bed reactor for the first time. A central composite experimental design (CCD) was used to optimize the reaction conditions. The effects of reaction temperatures and catalyst to reactant ratios on product yields were investigated. The main chemical compounds of catalytic bio-oils from glucose were phenols, ketones, and anhydrosugars, in which phenols were ranged from 4.8 to 100 % depending on different reaction conditions. The highest concentration of phenol in bio-oils was achieved at the reaction temperature of 450 °C with a catalyst to reactant ratio of 1. Carbon monoxide, carbon dioxide, methane, and hydrogen were the main gas fractions in gaseous products, where high concentrations of carbon monoxide (50.2 %) and hydrogen (9.2 %) could be attained. Additionally, catalytic pyrolysis of cellulose with various catalyst to reactant ratios at the reaction temperature of 450 °C was also investigated and the results exhibited similar phenomenon to those of glucose. A high selectivity of phenols (96.7 %) could also be achieved intergraded with a high concentration of carbon monoxide (42.1 %). The mechanism of phenol generation was further discussed and the "phenol pool" was proposed to describe the catalytic function of ACC in catalytic conversion of volatiles to phenols. Our findings suggest that the catalytic pyrolysis of renewable and earth-abundant carbohydrates over ACC might provide a novel and viable route to generate high-purity phenols to ultimately advance the utilization of biomass energy.

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Publication details

The article was received on 22 Feb 2018, accepted on 12 Jun 2018 and first published on 13 Jun 2018


Article type: Paper
DOI: 10.1039/C8GC00593A
Citation: Green Chem., 2018, Accepted Manuscript
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    From Glucose-Based Carbohydrates to Phenol-rich Bio-oil Integrated with Syngas Production via Catalytic Pyrolysis over Activated Carbon Catalyst

    Y. zhang, H. Lei, Z. yang, D. Duan, E. villota and R. Ruan, Green Chem., 2018, Accepted Manuscript , DOI: 10.1039/C8GC00593A

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