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MgO纳米晶负载镍催化剂用于甲烷蒸汽重整反应(英文)

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催化学报 2013年第7期34卷 1443-1448页

作者： Mahmood ANDACHE mehran rezaei Mansour KAZEMI MOGHADAM Department of Chemistry Islamic Azad UniversityOmidiyeh Branch Catalyst and Advanced Materials Research Laboratory Chemical Engineering DepartmentFaculty of EngineeringUniversity of Kashan Chemical Engineering Department Iran University of Science and Technology

Nanocrystalline MgO with a relatively high surface area and mesoporous structure was synthesized by a surfactant assisted precipitation method for use as the support of nickel catalysts for steam reforming of methane. The samples were characterized by X‐ray diffraction, N2 adsorption, temperature‐programmed reduction, temperature‐programmed oxidation, scanning electron microscopy, and transmission electron microscopy. The catalysts showed high catalytic activity and good stability in the steam reforming of methane. Increasing the nickel loading up to 10 wt% gave increased activity. Catalysts with higher nickel loadings showed more deposited carbon after reaction. The excellent anti‐coking performance of the catalysts was attributed to the formation of a nickel‐magnesia solid solution, basicity of the support surface, and nickel‐support interaction.

关键词：镍催化剂甲烷重整 MgO 纳米晶水蒸气重整载体透射电子显微镜扫描电子显微镜

Application of Rice Husk Biochar for Achieving Sustainable Agriculture and Environment

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Rice science 2021年第4期28卷 325-343页

作者： Hossein Asadi Mohammad Ghorbani mehran rezaei-Rashti Sepideh Abrishamkesh Elnaz Amirahmadi Chen Chengrong Manouchehr Gorji Soil Science Department University of TehranKarajIran Soil Science Department University of GuilanRashtIran Griffith School of Environment and Science Australian Rivers InstituteGriffith UniversityBrisbaneQLDAustralia Department of Forest Ecology Sari Agricultural Sciences and Natural Resources UniversityIran

This paper critically reviewed the current knowledge and challenges of rice husk biochar(RHB)production and its effects on soil properties,plant growth,immobilization of heavy metals,reduction of nutrient leaching and mitigation of greenhouse gas *** characteristics of RHBs produced at various pyrolysis temperatures were discussed and compared to biochars derived from other agro-industrial *** produced at higher pyrolysis temperatures show lower hydrogen/carbon ratio,which suggests the presence of higher aromatic carbon *** increase of pyrolysis temperature also results in production of RHBs with higher ash content,lower yield and higher surface *** usually has higher silicon and ash contents and lower carbon content compared to biochars derived from other feedstocks at the same pyrolysis *** it depends on soil type,RHB application can improve soil organic carbon content,cation exchange capacity,available K concentration,bulk density and microbial *** effect of RHB on soil aggregation mainly depends on soil *** growth of different crops is also enhanced by application of *** addition to soil can immobilize heavy metals and herbicides and reduce their *** application shows a significant capacity in reduction of nitrate leaching,although its magnitude depends on the biochar application rate and soil biogeochemical *** of RHB,especially in paddy fields,shows a promising mitigation effect on greenhouse gas(CH4,CO2 and N2O)*** RHB characteristics are also related to other factors such as pyrolysis heating rate and residence time,its performance for specific applications(*** sequestration,pH amendment)can be manipulated by adjusting the pyrolysis *** research is needed on long-term field applications of RHB to fully understand the advantages and disadvantages of RHB as a soil amendment.

关键词： carbon sequestration crop production greenhouse gas heavy metal nitrogen leaching soil amendment rice husk biochar

Effect of Ni loadings on the activity and coke formation of MgO-modified Ni/Al_2O_3 nanocatalyst in dry reforming of methane

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Journal of Energy Chemistry 2014年第5期23卷 633-638页

作者： Zahra Alipour mehran rezaei Fereshteh Meshkani Catalyst and Advanced Materials Research Laboratory Chemical Engineering Department Faculty of Engineering University of Kashan Institute of Nanoscience and Nanotechnology University of Kashan

MgO-modified Ni/Al2O3 catalysts with different Ni loadings were prepared and employed in dry reforming of methane （DRM）. The effect of Ni loadings on the activity and coke formation of Ni/MgO-A1203 catalysts were investigated. The synthesized catalysts were characterized by XRD, N2 adsorption-desorption, SEM, TPO and TPR techniques. The obtained results showed that increasing nickel loading decreased the BET surface area and increased the catalytic activity and amount of deposited carbon. In addition, the effect of gas hourly space velocity （GHSV） and feed ratio were studied.

关键词： nickel catalyst MgO modifier syngas dry reforming coke formation