Topic
Pyrolysis
About: Pyrolysis is a research topic. Over the lifetime, 34918 publications have been published within this topic receiving 833524 citations.
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TL;DR: In this article, the authors characterized a BC produced by fast pyrolysis for bio-oil generation and examined GHG efflux, C partitioning using d 13 C, and soil C sequestration across four temperate soils and five BC rates; 0, 1, 5, 10, and 20% w/w.
Abstract: Char is a product of thermochemical conversion of biomass via pyrolysis, together with gas (syngas), liquid (bio-oil), and heat. Fast pyrolysis is a promising process for bio-oil generation, which leaves 10–30% of the original biomass as char. Char produced for soil application, is defined biochar (BC), and it may increase soil C storage, and reduce soil emissions of greenhouse gases (GHG), such as N2O and CH4 –potentially making fast pyrolysis bioenergy generation a C-negative system. However, differences in production conditions (e.g., feedstock, pyrolysis temperature and speed, post handling, and storage conditions) influence the chemical properties of BC and its net effect when added to soils. Understanding if fast pyrolysis BC can increase C sequestration and reduce GHG emissions will enable full assessment of the economic value and environmental benefits of this form of bioenergy. We characterized a BC produced by fast pyrolysis for bio-oil generation and examined GHG (CO2 ,N 2O and CH4) efflux, C partitioning using d 13 C, and soil C sequestration across four temperate soils and five BC rates; 0%, 1%, 5%, 10%, and 20% w/w. The fast pyrolysis process created a highly aromatic, low N, ashrich BC with a O : C ratio of 0.01, which we expected to be highly recalcitrant. Across soils, CO2 emissions increased linearly and N2O emissions decreased exponentially with increasing BC addition rates. Despite still being actively respired after 2 years, total BC-derived C-CO2 comprised less than the BC volatile C content (4%). Expressed as CO2 equivalents, CO2 was the primary GHG emitted (97.5%), followed by N2O. All GHG emissions were small compared to the total SOC sequestered in the BC. Fast pyrolysis produced a highly recalcitrant BC that sequestered C and reduced GHG emissions. The recovery and soil application of BC would contribute to a negative carbon balance for this form of bioenergy generation.
184 citations
TL;DR: The remarkably high yield of olefins from ex-situ CP indicates the potential of exploiting the process to preferentially produce oleFins as a primary product from biomass, with aromatics being the secondary products.
184 citations
TL;DR: When hydrotreatment was carried out with bio-oil obtained from pyrolysis of pine sawdust under the optimal conditions determined for phenol, the pH of bio- oil increased from 2.27 to 4.07, and the hydrogen content increased from 6.28 to 7.01 wt.%.
183 citations
TL;DR: In this article, the authors describe the formation of coal and coke in three different conversion processes: pyrolysis, steam gasification, and partial oxidation over a wide temperature range from 600 to 1400°C.
183 citations
TL;DR: In this article, a preliminary mechanistic understanding of wet sewage sludge decomposition from starting constituents to final products, including intermediates formed during the pyrolysis process was developed.
183 citations