Influence of difference in chemical compositions of rice straw on hydrogen formation in nickel-catalyzed steam gasification

2012 ◽  
Vol 95 ◽  
pp. 78-83 ◽  
Author(s):  
Kenji Murakami ◽  
Masahiko Sato ◽  
Takahiro Kato ◽  
Katsuyasu Sugawara
Keyword(s):  
Rice Straw ◽  
Steam Gasification ◽  
Chemical Compositions ◽  
Hydrogen Formation

Parametric study of pyrolysis and steam gasification of rice straw in presence of K2CO3

2016 ◽  
Vol 33 (9) ◽  
pp. 2567-2574 ◽  
Author(s):  
Humair Ahmed Baloch ◽  
Tianhua Yang ◽  
Haipeng Sun ◽  
Jie Li ◽  
Sabzoi Nizamuddin ◽  
...  
Keyword(s):  
Rice Straw ◽  
Parametric Study ◽  
Steam Gasification

Conversion of rice straw into valuable products by hydrothermal treatment and steam gasification

Fuel ◽  
2012 ◽  
Vol 93 ◽  
pp. 37-43 ◽  
Author(s):  
Kenji Murakami ◽  
Kengo Kasai ◽  
Takahiro Kato ◽  
Katsuyasu Sugawara
Keyword(s):  
Hydrothermal Treatment ◽  
Rice Straw ◽  
Steam Gasification

Simulation of Rice Straw Oxygen-Steam Gasification in an Entrained-Flow Gasifier Using ASPEN PLUS

2011 ◽  
Vol 71-78 ◽  
pp. 2389-2395 ◽  
Author(s):  
Yuan Mou Wu ◽  
Jin Song Zhou ◽  
Zhong Yang Luo
Keyword(s):  
Rice Straw ◽  
Residence Time ◽  
Aspen Plus ◽  
Steam Gasification ◽  
Pyrolysis Process ◽  
Optimum Amount ◽  
Pyrolysis Products ◽  
Biomass Utilization ◽  
Gasification Process ◽  
Entrained Flow Gasifier

Biomass oxygen-steam gasification associated with synthesis technology known as indirect biomass liquefaction is regarded as one of the most promising technologies of biomass utilization. In this paper, a comprehensive gasification model was developed for the simulation of rice straw oxygen-steam gasification using ASPEN PLUS. The gasification process was divided into two parts: pyrolysis and gasification. The RYield module was used to simulate the pyrolysis process with an external FORTURN program to calculate the pyrolysis products while the gasification process was calculated by the RCSTR module. With the help of the model, the gasification of rice straw was simulated under different residence time, different temperature and different amount of steam. The results showed that the proper residence time and temperature is 1.5s and 1300°C, respectively. The optimum amount of steam is steam/biomass=0.12 while the addition of oxygen is oxygen/biomass=0.2.

Effects of sodium carbonate pretreatment on the chemical compositions and enzymatic saccharification of rice straw

2012 ◽  
Vol 124 ◽  
pp. 283-291 ◽  
Author(s):  
Linfeng Yang ◽  
Jie Cao ◽  
Yongcan Jin ◽  
Hou-min Chang ◽  
Hasan Jameel ◽  
...  
Keyword(s):  
Rice Straw ◽  
Sodium Carbonate ◽  
Enzymatic Saccharification ◽  
Chemical Compositions

Influence of mixed molten carbonate composition on hydrogen formation by steam gasification

2011 ◽  
Vol 13 (1) ◽  
pp. 50-55 ◽  
Author(s):  
Tohru Kamo ◽  
Beili Wu ◽  
Yuriko Egami ◽  
Hajime Yasuda ◽  
Hideki Nakagome
Keyword(s):  
Steam Gasification ◽  
Molten Carbonate ◽  
Hydrogen Formation ◽  
Carbonate Composition

Conversion of Rice Straw to Bio-Fuel by Pyrolysis in Molten KCl-LiCl

2013 ◽  
Vol 634-638 ◽  
pp. 716-722
Author(s):  
Deng Xiang Ji ◽  
Li Cui ◽  
Cheng Jie Huang ◽  
Ming Hui Gao ◽  
Feng Wen Yu ◽  
...  
Keyword(s):  
Gas Chromatography ◽  
Rice Straw ◽  
Gas Flow ◽  
Maximum Yield ◽  
Chemical Compositions ◽  
Pyrolysis Products ◽  
Flow Rates ◽  
Gaseous Products ◽  
Bio Oil ◽  
Increasing Temperature

The objective of this study was to provide background date on rice straw pyrolysis in molten KCl(40mol%)-LiCl(60mol%). The effects of pyrolysis temperatures and sweep gas flow rates on the pyrolysis products yields and their chemical compositions were studied. The temperatures of pyrolysis and sweep gas flow rates were varied in the range of 380°C -540°C and 60L/h-260L/h, respectively. The compositions of gaseous products were analyzed by gas chromatography, and that of bio-oil obtained was investigated using gas chromatography-mass spectroscopic(GC-MS) technique. The yield of gaseous products increases with the increasing temperature, the char yield has demonstrated a downtrend, and the maximum yield of bio-oil is up to 15.43 wt.% at 460°C. The yield of char decreases with the sweep flow rate, the gaseous has a minimum yield at 100L/h, and the maximum yield of bio-oil is 15.43wt.% at 100L/h .The main gaseous products are CO, CO2 , H2 and CH4. Ketones and phenols are the main compounds in the bio-oil, the presence of molten inhabites their formation, and promotes the production of furfural. The bio-oil attained from pyrolysis is a potential source of renewable fuel and chemical feedstock.

Analytical Electron Microscopy of Ion-Implanted Metals

1985 ◽  
Vol 43 ◽  
pp. 282-285
Author(s):  
D.I. Potter ◽  
M. Ahmed ◽  
K. Ruffing
Keyword(s):  
Electron Microscopy ◽  
Ion Implantation ◽  
Friction And Wear ◽  
Analytical Electron Microscopy ◽  
Chemical Compositions ◽  
Surface Chemical ◽  
Near Surface ◽  
The Past ◽  
Analytical Electron ◽  
Property Changes

Ion implantation, used extensively for the past decade in fabricating semiconductor devices, now provides a unique means for altering the near-surface chemical compositions and microstructures of metals. These alterations often significantly improve physical properties that depend on the surface of the material; for example, catalysis, corrosion, oxidation, hardness, friction and wear. Frequently the mechanisms causing these beneficial alterations and property changes remain obscure and much of the current research in the area of ion implantation metallurgy is aimed at identifying such mechanisms. Investigators thus confront two immediate questions: To what extent is the chemical composition changed by implantation? What is the resulting microstructure? These two questions can be investigated very fruitfully with analytical electron microscopy (AEM), as described below.

TEM/AEM characterization of fine-grained clay minerals in very-low-grade rocks: Evaluation of contamination by empa involving celadonite family minerals

1996 ◽  
Vol 54 ◽  
pp. 694-695
Author(s):  
Gejing Li ◽  
D. R. Peacor ◽  
D. S. Coombs ◽  
Y. Kawachi
Keyword(s):  
Electron Microscopy ◽  
Volcanic Rocks ◽  
Analytical Electron Microscopy ◽  
Metamorphic Rocks ◽  
New Mineral ◽  
Chemical Compositions ◽  
Low Grade ◽  
Fine Grained ◽  
Depth Analysis ◽  
Mineral Aggregates

Recent advances in transmission electron microscopy (TEM) and analytical electron microscopy (AEM) have led to many new insights into the structural and chemical characteristics of very finegrained, optically homogeneous mineral aggregates in sedimentary and very low-grade metamorphic rocks. Chemical compositions obtained by electron microprobe analysis (EMPA) on such materials have been shown by TEM/AEM to result from beam overlap on contaminant phases on a scale below resolution of EMPA, which in turn can lead to errors in interpretation and determination of formation conditions. Here we present an in-depth analysis of the relation between AEM and EMPA data, which leads also to the definition of new mineral phases, and demonstrate the resolution power of AEM relative to EMPA in investigations of very fine-grained mineral aggregates in sedimentary and very low-grade metamorphic rocks.Celadonite, having end-member composition KMgFe3+Si4O10(OH)2, and with minor substitution of Fe2+ for Mg and Al for Fe3+ on octahedral sites, is a fine-grained mica widespread in volcanic rocks and volcaniclastic sediments which have undergone low-temperature alteration in the oceanic crust and in burial metamorphic sequences.

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