Microwave-assisted co-pyrolysis of high ash Indian coal and rice husk: Product characterization and evidence of interactions

The microwave-assisted solution combustion synthesis was applied to the initial synthesizing of Ca3Co2O6powder using glycine as a fuel and nitrate as an oxidant. The as-synthesized powders were calcined at 700-1,000ºC for 4h. Product characterization was performed using Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD) and Scanning electron microscope (SEM). The fuel-to-oxidizer molar ratio was found to affect the combustion reaction and character of the powder obtained. The phase composition of powder after calcination at various temperatures has shown that the formation of Ca3Co2O6occurs directly. The calcined powder possesses a rhombohedral crystal structure with an X-ray diffraction pattern that could be matched with the Ca3Co2O6JCPDS: 89-0629. This method is a simple way of synthesizing fine Ca3Co2O6powder with a low calcination temperature.

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Microwave-assisted catalytic fast pyrolysis of rice husk over a hierarchical HZSM-5/MCM-41 catalyst prepared by organic base alkaline solutions

The Science of The Total Environment ◽

10.1016/j.scitotenv.2020.141215 ◽

2021 ◽

Vol 750 ◽

pp. 141215

Author(s):

Zhaoying Li ◽

Zhaoping Zhong ◽

Bo Zhang ◽

Wei Wang ◽

Hao Zhao ◽

...

Keyword(s):

Rice Husk ◽

Fast Pyrolysis ◽

Alkaline Solutions ◽

Organic Base ◽

Catalytic Fast Pyrolysis ◽

Microwave Assisted ◽

Mcm 41

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Microwave-assisted Enzymatic Hydrolysis to Produce Xylooligosaccharides from Rice Husk Alkali- soluble Arabinoxylan

10.21203/rs.3.rs-690626/v1 ◽

2021 ◽

Author(s):

Wannaporn Klangpetch ◽

Alisa Pattarapisitporn ◽

Suphat Phongthai ◽

Pannapapol Jaichakan

Keyword(s):

Enzymatic Hydrolysis ◽

Sodium Hydroxide ◽

Microwave Heating ◽

Rice Husk ◽

Sugar Content ◽

Microwave Treatment ◽

Heating Process ◽

Microwave Pretreatment ◽

Microwave Assisted ◽

Pretreatment Time

Abstract This study aimed to produce xylooligosaccharide (XOS) and arabino-xylooligosaccharide (AXOS) from rice husk (RH) using microwave treatment combined with enzymatic hydrolysis and evaluate their prebiotic properties. The RH was pretreated by a microwave heating process at 140, 160 and 180°C for 5, 10, and 15 min to obtain crude arabinoxylan (AX). The results emphasized that increasing microwave pretreatment time increased sugar content. The crude AX was then extracted with 2% (w/v) sodium hydroxide at 25°C for 24 h. The obtained AX was then used as a substrate for XOS production by commercial xylanases. The results showed that the oligosaccharide produced by Pentopan Mono BG and Ultraflo Max provided xylobiose and xylotriose as the main products. Interestingly, AXOS was also present in the oligosaccharide product. Furthermore, the oligosaccharides obtained were able to promote the growth of Lactobacillus spp. and to resist degradation more than 70% after exposure to simulated human digestion.

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OPTIMIZATION OF RICE HUSK HYDROLYSIS TIME INTO FURFURAL ASSISTED BY MICROWAVE

Konversi ◽

10.20527/k.v8i2.7013 ◽

2019 ◽

Vol 8 (2) ◽

Author(s):

Marinda Rahim ◽

Arief Adhiksana ◽

Mina Indriani

Keyword(s):

Gas Chromatography ◽

Rice Husk ◽

Rice Production ◽

Hydrolysis Time ◽

Optimum Time ◽

Hydrolysis Method ◽

Microwave Assisted ◽

East Kalimantan ◽

One Step ◽

Microwave Assisted Method

Rice production in East Kalimantan is quite high. In the process of milling usually rice husk obtained is about 20-30% from grains weight produced. The quite potential amount of rice husk has not yet widely utilized, even though rice husk contains pentosan which can be processed into furfural by hydrolysis method. The purpose of this research is to develop one step hydrolysis technique of rice husk into furfural with microwaves assistance to obtain the optimum time which can produce maximum furfural. In this research 50 grams of rice husk was added with 500 mL of H2SO4 1% as the catalyst. The mixture was then hydrolyzed using microwave-assisted method with a time variety of 15, 30, 45, 60, 75, 90, 105 and 120 minutes. The result of analysis by Gas Chromatography (GC) showed that the highest result of furfural was at 90 minutes with a yield of 2.923%.

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