|
|
|
|
| |
|
|
| Macedo, Lucélia Alves; Rousset, Patrick Louis Albert; Vale, Ailton Teixeira. |
| This work assessed the effect of biomass composition (ash, volatile matter and fixed carbon content, carbon, hydrogen and nitrogen content, lignin, extractives and holocellulose content) on the condensable gas yield from the torrefaction of rice husk (Oryza sativa L.), jatropha seed husk (Jatropha curcas L.), elephant grass (Pennisetum purpureum Schum. var. mineiro); sugarcane bagasse (Sacharum officinarum L.) and bamboo (Bambusa vulgaris ex J.C. Wendl. var. vulgaris). Biomasses with a particle size between 0.5 mm and 1.0 mm were subjected to torrefaction process using a temperature gradient varying from 250 °C to 300 °C, for 15 min, with a heating rate of 20 °C min-1. Five trials were conducted for each biomass and solid, liquid and gas yields were... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Chemical composition; Thermal treatment; Liquid by-product Recursos Florestais; Engenharia Florestal Bioenergia Composição química; Tratamento térmico; Análise imediata. |
| Ano: 2014 |
URL: http://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/747 |
| |
|
| |
|
|
| Nonaka,Adriele Galeti; Batista,Marcelo Augusto; Costa,Antonio Carlos Saraiva da; Inoue,Tadeu Takeyoshi; Bonadio,Taiana Gabriela Moretti; Souza Junior,Ivan Granemann de. |
| ABSTRACT Maghemite (γ-Fe2O3) and hematite (α-Fe2O3) are important iron oxides in Brazilian soils derived from basalt. Maghemite can transform into hematite when exposed to high temperatures. However, isomorphic substitution (e.g., Al3+) may largely influence this process. We analyzed the kinetics of thermal transformation of Al-maghemites into Al-hematites and some of its mineralogical aspects. Synthetic substituted maghemites with different degrees of Al-substitution (0.0, 1.0, 2.0, 2.9, 3.8, 5.6, 6.7, 10.0, 12.0, and 17.1 mol% Al) were subjected to a temperature of 500±10 °C for 0, 5, 10, 16, 64, 128, 192, 360, 720, 2160, 3600, 5040, and 6480 min. After thermal treatment, samples were characterized by X ray diffraction (XRD), differential thermal... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Rietveld refinement; Thermal treatment; Mean crystallite dimension. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832017000100410 |
| |
|
|
| Lin,Yun; Munroe,Paul; Joseph,Stephen; Henderson,Rita. |
| The objective of this work was to determine the contribution of dissolved organic carbon (DOC) from a biochar mineral complex (BMC), so as to better understand the interactions between DOC, biochar, clay, and minerals during thermal treatment, and the effects of BMC on amended soils. The BMC was prepared by heating a mixture of a H3PO4-treated saligna biochar from Acacia saligna, clays, other minerals, and chicken manure. The BMC was applied to a sandy loam soil in Western Australia, where wheat was grown. Liquid chromatography-organic carbon detection (LC-OCD) tests were carried out on water extracts from the untreated biochar, the BMC, the BMC-amended soil, and on a control soil to measure the DOC concentration. LC-OCD tests provide a fingerprint of the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: LC-OCD; Carbon fractionation; Humic substances; Thermal treatment; Soil carbon dynamics; Water-extractable organic carbon. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2012000500007 |
| |
|
| |
|
|
| Huller, Lenon Augusto Simon; Haselein, Clóvis Roberto; Silveira, Amanda Grassmann da; Menezes, Walmir Marques de; Talgatti, Maiara; Souza, Joel Telles de; Santini, Elio José. |
| The genera Eucalyptus is widely used by Brazilian industries. Nonetheless some concerns still persist regarding some of its technological properties. Aiming the improvement of the wood properties the heat treatment is being largely employed in Brazil. The objective of this research was to study the effect of heat treatment on physical and mechanical properties of Eucalyptus cloeziana. We sampled 5 trees with 21 years from which we used the first two logs with length of 3 m each. Heat treatment of 160 and 210 °C were applied for 1 h. The evaluate physical properties were equilibrium moisture content, mass reduction, loss of density, total swelling coefficient (linear and volumetric) and coefficient of anisotropy. The determination of the mechanical strength... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Dimensional stability; Thermal treatment; Wood quality Recursos Florestais Estabilidade dimensional; Termorretificação; Qualidade da madeira. |
| Ano: 2017 |
URL: http://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/1288 |
| |
|
|
| Pereira, Matheus Perdigão de Castro Freitas; Costa, Emylle Veloso Santos; Corradi Pereira, Bárbara Luísa; Carvalho, Ana Márcia Macedo Ladeira; Oliveira Carneiro, Angélica de Cássia; Costa, Aylson. |
| Torrefaction also known as pre-carbonization is heat treatment at low temperatures (200 ºC to 300 °C), applied to lignocellulosic materials with the aim of improving their energetic properties. We developed this study to evaluate the effect of torrefaction temperature on properties of eucalyptus chips. Using a furnace, the eucalyptus chips underwent four heat treatments at temperatures of 150 ºC, 200 ºC, 250 ºC and 300 °C, for ten min. Physical and chemical analyzes of torrefied and in natura chips were carried out. The results were submitted to analysis of variance and when established significant differences, applied Tukey test at 95% significance. Increasing roasting temperature showed higher lignin content and fixed carbon, less equilibrium moisture... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Biomass; Thermal treatment; Wood chips. |
| Ano: 2016 |
URL: http://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/1093 |
| |
|
|
|
