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RISS 인기검색어
- 검색키워드
- 저자 : Naoko Ellis (검색결과 3 건)
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Mohamed, Badr A.,Ellis, Naoko,Kim, Chang Soo,Bi, Xiaotao,Emam, Ahmed El-raie Elsevier 2016 Science of the Total Environment Vol.566 No.-
<P><B>Abstract</B></P> <P>Engineered biochars produced from microwave-assisted catalytic pyrolysis of switchgrass have been evaluated in terms of their ability on improving water holding capacity (WHC), cation exchange capacity (CEC) and fertility of loamy sand soil. The addition of K<SUB>3</SUB>PO<SUB>4</SUB>, clinoptilolite and/or bentonite as catalysts during the pyrolysis process increased biochar surface area and plant nutrient contents. Adding biochar produced with 10wt.% K<SUB>3</SUB>PO<SUB>4</SUB> +10 wt.% clinoptilolite as catalysts to the soil at 2wt% load increased soil WHC by 98% and 57% compared to the treatments without biochar (control) and with 10wt.% clinoptilolite, respectively. Synergistic effects on increased soil WHC were manifested for biochars produced from combinations of two additives compared to single additive, which may be the result of increased biochar microporosity due to increased microwave heating rate. Biochar produced from microwave catalytic pyrolysis was more efficient in increasing the soil WHC due to its high porosity in comparison with the biochar produced from conventional pyrolysis at the same conditions. The increases in soil CEC varied widely compared to the control soil, ranging from 17 to 220% for the treatments with biochars produced with 10wt% clinoptilolite at 400°C, and 30wt% K<SUB>3</SUB>PO<SUB>4</SUB> at 300°C, respectively. Strong positive correlations also exist among soil WHC with CEC and biochar micropore area. Biochar from microwave-assisted catalytic pyrolysis appears to be a novel approach for producing biochar with high sorption affinity and high CEC. These catalysts remaining in the biochar product would provide essential nutrients for the growth of bioenergy and food crops.</P> <P><B>Highlights</B></P> <P> <UL> <LI> High quality biochar was made by catalytic pyrolysis in a microwave reactor. </LI> <LI> High heating rate and good biochar quality were achieved using K<SUB>3</SUB>PO<SUB>4</SUB> and clinoptilolite mixture. </LI> <LI> Biochars showed significant increase in soil WHC and CEC. </LI> <LI> Microwave catalytic pyrolysis can produce efficient biochar at low temperature (300°C). </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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Fuel properties of bio-oil/bio-diesel mixture characterized by TG, FTIR and 1^H NMR
Jiang Xiaoxiang,Zhong Zhaoping,Naoko Ellis 한국화학공학회 2011 Korean Journal of Chemical Engineering Vol.28 No.1
There has been an increasing interest in alternative fuels made from biomass which is abundant and renewable. Bio-oil and bio-diesel seem to be such promising liquid fuels. Bio-oil produced by fast pyrolysis of biomass is highly viscous, acidic, and has high water content. To overcome these problems as a fuel, a method of emulsifying bio-oil with bio-diesel was performed in the previous paper, and a stable mixture of bio-oil and bio-diesel was successfully prepared. In this paper, several properties of the mixture are discussed by using TG, FTIR and 1^H NMR. The results show us that, compared with crude bio-oil, some properties of bio-oil/bio-diesel mixture such as water content,acid number, viscosity are much improved. The thermal decomposition of the mixture under air/nitrogen is shown using a thermogravimetric analyzer (TGA). Further information about the functional groups is exhibited through Fourier Transform infrared spectrometer (FTIR) and nuclear magnetic spectroscopy (NMR).
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Arian Ebneyamini,Jun Young Kim,Zezhong John Li,John R. Grace,C. Jim Lim,Naoko Ellis 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.87 No.-
This paper investigates the equilibrium performance of CaO hydration and CaCO3/Ca(OH)2 co-calcinationin calcium-looping processes. A novel lime hydration configuration is proposed, introducing saturatedsteam as the reactivating reagent and direct-heat-removal medium. The proposed hydrator generates asubstantial amount of superheated steam, used elsewhere as required. The slaked lime and limestone arecalcined simultaneously in a methane-concentrated oxy-fuel calciner. The equilibrium performance ofthe co-calciner is studied at different reactor temperatures, operating pressures, solid/gas feed ratios andfeed compositions. A correlation is proposed which estimates the required gaseous feed composition forautothermal, coke-free and complete sorbent regeneration using this novel technology.
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