scholarly journals Modification of Silica Rice Husk Ash to Solid Ammonium Sulphate for Second Generation Biofuels Productions

2014 ◽  
Vol 2014 ◽  
pp. 1-9 ◽  
Author(s):  
Kasim Mohammed Hello ◽  
Majid Jari Mohammed ◽  
Asstabraq Mohsen Yasser ◽  
Farook Adam ◽  
Zinab Farag
Keyword(s):  
Ammonium Sulphate ◽  
Rice Husk ◽  
Room Temperature ◽  
Rice Husk Ash ◽  
Acid Sites ◽  
Significant Loss ◽  
Amine Group ◽  
New Approach ◽  
End Groups ◽  
Tga Analysis

A new approach has been demonstrated for the synthesis of solid ammonium sulphate attached to silica rice husk ash. The 3-(aminopropyl)triethoxysilane was immobilized onto silica at room temperature to functionalize the silica with ammine end groups (–NH2). The amine group was sulphated with sulphuric acid to produce a novel micro-rod-like shaped acidic catalyst (as seen with TEM) designated RHNH3SO4H (RH = rice husk). The TGA analysis shows that the catalyst is stable at temperatures below 200°C. The acidity measurement of the catalyst indicates that it has Brønsted acid sites. Cellulose extracted from waste of rice husk and cellulose extracted from office paper were hydrolysed to glucose in 6 h, and the glucose was hydrolysed afterwards to other products within 13 h. The catalyst is reusable many times without a significant loss of catalytic activity.

Effect of Rice Husk Ash Based Silicon Dioxide on the Properties of SUZ-4 Zeolite

2017 ◽  
Vol 729 ◽  
pp. 24-29
Author(s):  
Thitipob Sirisoontornpanit ◽  
Atichat Wongkoblab ◽  
Supunnee Junpirom
Keyword(s):  
Silicon Dioxide ◽  
Rice Husk ◽  
Rice Husk Ash ◽  
Sol Gel ◽  
Hydrothermal Process ◽  
Temperature Programmed Desorption ◽  
Acid Sites ◽  
Weak Acid ◽  
Molar Ratio ◽  
Temperature Programmed

SUZ-4 zeolite was synthesized by the sol-gel technique, followed by hydrothermal process. The effect of the molar ratio of rice husk ash based silicon dioxide to silica solution was investigated. The synthesized zeolite was characterized by XRD, SEM, N2 adsorption and temperature programmed desorption. The results show that the SUZ-4 zeolite was formed for all investigated conditions. However, the formation of MER zeolite occurred as an impurity for the content of rice husk ash higher than 75%. A needle shape crystal with mainly microporous structure is the feature of synthesized SUZ-4 zeolite. The result of temperature programmed desorption indicated that the chemical surface property of obtained SUZ-4 zeolite was weak acid sites.

scholarly journals A New Approach to Improve Durability of Rice Husk Ash Blended Concrete with Re-Dispersible Polymer Powder

2018 ◽  
Vol 0 (0) ◽  
pp. 0-0
Author(s):  
Daddan Khan Bangwar ◽  
Abdullah Saand ◽  
Manthar Ali Keerio ◽  
Muhammad Auchar Zardari
Keyword(s):  
Rice Husk ◽  
Rice Husk Ash ◽  
New Approach ◽  
Polymer Powder

Silica Nanoparticles from Rice Husk Ash: A Green Catalyst for the One-Pot Three-Component Synthesis of Benzo[B]Furan Derivatives

2014 ◽  
Vol 875-877 ◽  
pp. 202-207 ◽  
Author(s):  
Ali Ramazani ◽  
Morteza Rouhani ◽  
Sang Woo Joo
Keyword(s):  
Silica Nanoparticles ◽  
Rice Husk ◽  
Room Temperature ◽  
Rice Husk Ash ◽  
One Pot ◽  
Furan Derivatives ◽  
Green Catalyst ◽  
Iminium Ion ◽  
The One ◽  
High Yields

Reaction of an isocyanide with an iminium ion intermediate, formed by reaction between an electronpoor 2-hydroxybenzaldehyde derivative and a secondary amine in the presence of silica nanoparticles proceeds smoothly at room temperature to afford benzo [b] furan derivatives in high yields.

FTIR and TGA Analysis in Relation with the % Crystallinity of the SiO2 Obtained by Burning Rice Husk at Various Temperatures

2012 ◽  
Vol 585 ◽  
pp. 77-81 ◽  
Author(s):  
Pallavi Deshmukh ◽  
Dilip Peshwe ◽  
Shailkumar Pathak
Keyword(s):  
Rice Husk ◽  
Rice Husk Ash ◽  
Waste Product ◽  
Industrial Applications ◽  
Amorphous Sio2 ◽  
Nano Sio2 ◽  
Different Temperatures ◽  
Cheap Alternative ◽  
Length Width ◽  
Tga Analysis

Rice husk ash (RHA), a waste product of the rice industry, is rich in SiO2. The large amount of SiO2 freely obtained from it provides an abundant and cheap alternative to metallurgical grade SiO2 for many industrial applications. The detailed analysis of the physical dimensions such as length, width and thickness of four varieties (HMT, Sonam, 1001 and JSR) was done. The FTIR analysis of the ash obtained by burning rice husk at different temperatures proves the formation of nano SiO2. The study of the isothermal thermal degradation of the RHA was done by TGA analysis .During TGA analysis it was observed that, mass trace suddenly goes backwards along the abscissa and then continues forward normally. This characteristic behavior of the TGA plot was attributed to the formation of nano SiO2 during incineration of the RHA. The minimum value of the percentage crystallinity of the SiO2 at 500°C proved the formation of amorphous SiO2.

Synthesis of Geopolymer Paste as Coating Material Based on Kaolinite and Rice Husk Ash

2016 ◽  
Vol 841 ◽  
pp. 79-82 ◽  
Author(s):  
Ruth Meisye Kaloari ◽  
Syamsidar ◽  
Sulfiana ◽  
Abdul Haris ◽  
Subaer
Keyword(s):  
Thermal Properties ◽  
Rice Husk ◽  
Fire Protection ◽  
Room Temperature ◽  
Chemical Resistance ◽  
Rice Husk Ash ◽  
Good Condition ◽  
Coating Material ◽  
Coated Material ◽  
Geopolymer Paste

The purpose of this research is to study the properties of geopolymer paste based on metakaolin and rice husk ash (RHA) as coating material. Geopolymer paste was produced through alkaline activation method added with rice husk ash as much as 15% relative to the mass of metakaolin. The coating was achieved by painting the substrates with geopolymer paste. The coated material were cured at 60 °C for 3 hours. Samples were left at room temperature until seven days before any testing was conducted. The chemical resistance of the sample was studied by immersing the samples into (H2SO4) 1% for three days and it was found that the coated material was still in good condition. The presence of RHA was found to improve the thermal properties of geopolymer paste. The results showed that geoplymer paste was an excellent coating material for chemical and fire protection.

Development of Polymer Modified Rice Husk Ash Concrete (PMRHAC)

2015 ◽  
Vol 1129 ◽  
pp. 500-507
Author(s):  
Abdullah Saand ◽  
Daddan Khan Bangwar ◽  
Manthar Ali Kerio
Keyword(s):  
Rice Husk ◽  
Rice Husk Ash ◽  
Energy Dispersive Spectrometer ◽  
Silica Content ◽  
Polymer Modification ◽  
X Ray Diffraction ◽  
New Approach ◽  
Polymer Powder ◽  
Optimum Proportion ◽  
Polymer Modified Concrete

The polymer modification of the concrete has been performed successfully for last more than 85 years. A number of polymer-based admixtures are being used to alter the properties of concrete to be used for repair and rehabilitation of concrete. The initiated research focuses on a new approach of development of polymer-modified concrete with appropriate replacement of cement with rice husk ash (RHA) produced by the incineration of rice husk. This paper presents the optimum possible replacement of cement with rice husk ash by not compromising on mechanical properties of concrete and addition of optimum proportion of re-dispersible polymer powder (RPP).The Energy Dispersive Spectrometer (EDS) and X-ray diffraction (XRD) were conducted to verify silica content and amorphous silica in RHA. The replacement of cement with RHA was done with 1% to 15%. The significant improvement in compressive strength with 10 % replacement of cement with RHA is obvious in the results. Further, on inclusion of various % age dosages of RPP in the optimum mix of rice husk ash concrete, the visible improvement in the strength, particularly in the tensile strength is achieved with 2.5 % (of weight of cement) inclusion of re-dispersible polymer powder.

Microstructure and Dielectric Properties of 0-3 Cement/Rice Husk Ash-Lead Niobate Zirconate Titanate Ceramic Composites

2015 ◽  
Vol 804 ◽  
pp. 119-123
Author(s):  
Nittaya Jaitanong ◽  
Arnon Chaipanich
Keyword(s):  
Dielectric Properties ◽  
Portland Cement ◽  
Rice Husk ◽  
Room Temperature ◽  
Ordinary Portland Cement ◽  
Rice Husk Ash ◽  
Ceramic Composites ◽  
Particle Sizes ◽  
Zirconate Titanate ◽  
Titanate Ceramic

The microstructure and dielectric properties of lead niobate zirconate titanate (PNZT), rice husk ash (RHA) and Ordinary Portland cement (OPC) composites were investigated. Ordinary Portland cement was partially replaced with rice husk ash at 20% by weight of binder. The rice husk ash was ground for 180 minutes before using. PNZT of mid particle sizes (450μm) were used at 30%, 50% and 70% by volume to produce the composites. The composites were mixed and pressed together and cured with 97%RH in chamber water bath for 3 days before measurements. The dielectric properties were measured under room temperature at different frequency. The results indicated that the dielectric constant of the 0-3 PC/RHA-PNZT composites increased with increasing PNZT content.

scholarly journals Studies on the durability of wood-cement particleboards produced with residues of Pinus spp., silica fume, and rice husk ash

BioResources ◽  
2020 ◽  
Vol 15 (2) ◽  
pp. 3064-3086
Author(s):  
Adauto José Miranda de Lima ◽  
Setsuo Iwakiri ◽  
Kestur G. Satyanarayana ◽  
María Guadalupe Lomelí-Ramírez
Keyword(s):  
Mechanical Properties ◽  
Silica Fume ◽  
Rice Husk ◽  
Rice Husk Ash ◽  
Physical And Mechanical Properties ◽  
Significant Loss ◽  
Natural Weathering ◽  
Accelerated Weathering ◽  
Cement Particle ◽  
Pinus Spp

Wood-cement composites were considered as substitutes for wood or asbestos cement. This research is focused on the development, characterization, and durability of different wood-cement particle boards composed of wood waste [residual particles of pine species (Pinus spp.)], with silica fume or rice husk ash. The wood-cement panels produced by cold compression were evaluated for their physical and mechanical properties after accelerated and natural weathering for 28 and 91 days of curing, respectively. Results indicate that the performance of wood-cement panels containing the Pinus spp. residue was comparable to that of lignocellulosic aggregate in wood cement panels. Pine residue wood panels exhibited high levels of pozzolanic activity, suggesting that silica fume or rice husk ash could be used as a partial substitute in Portland cement. There was a significant loss of mechanical properties over time with both the reference panel and the panel produced with pozzolana. Although there was no direct correlation between the values of accelerated weathering tests and natural weathering tests, there was a larger degradation of the panels after 20 cycles of the accelerated weathering than that after 12 months of natural weathering. Morphology studies supported the observed results.

Sign in / Sign up

Export Citation Format

Share Document