以 Salicornia 属的两个野生种为实验材料,在海水处理条件下对其地上部的生长状况及无机养分的吸收特性进行了分析。结果表明:随着海水处理浓度的增加,生物量表现出旺盛的生长趋势,100%海水处理区的生产量最高:两个野生种的地上部 Na ...以 Salicornia 属的两个野生种为实验材料,在海水处理条件下对其地上部的生长状况及无机养分的吸收特性进行了分析。结果表明:随着海水处理浓度的增加,生物量表现出旺盛的生长趋势,100%海水处理区的生产量最高:两个野生种的地上部 Na 的含量和海水处理浓度之间有明显的正相关。Na 在 Salicornia 属植物体内的积累阻碍 K 离子的吸收。淡水区 S.bigelovii 的 Ca 积累高于各盐水处理区,随着海水处理浓度的增加 Ca 的积累呈缓慢下降趋势。S.herbacea 的 Ca 的积累呈相与 S.bigelovii 相反的趋势。Mg 的积累和 Ca 的积累规律基本上相同。海水处理影响 Salicornia 属地上部氮和碳的积累过程。Salicornia 属的两个野生种 S.bigelovii 和 S.herbacea 在海水处理下的生长及养分积累都表现出极高的趋同性。展开更多
Because of socioeconomic considerations,wide-scale production of biofuel necessitates the utilization of nonedible biomass feedstock that does not compete for land and fresh water resources.In this regard,Salicornia b...Because of socioeconomic considerations,wide-scale production of biofuel necessitates the utilization of nonedible biomass feedstock that does not compete for land and fresh water resources.In this regard,Salicornia bigelovii(SB)is the most investigated halophyte species.The high oil content in SB seeds has sparked mounting research that aims to utilize SB as an industrial crop in the production of bio-oil,particularly in coastal areas where these plants thrive.However,the oil extracted from the pyrolysis of raw SB seeds is largely dominated by oxygenated fatty acids,most notably 9,12-octadecadienoic acid and 9,17-octadecadienal,typical to that of other crops.The pyrolysate bio-oil of the raw SB seeds exhibited a relative yield of oxygenated compounds that decreased from 57.05%at 200℃to 9.81%at 500℃,and the relative yield of nitrogenated compounds increased from 4.86%at 200℃to 21.97%at 500℃.To improve the quality of the produced bio-oil,herein we investigated the catalytic hydrodeoxygenation(HDO)of the fragments that were produced from the thermal degradation of SB seeds.A 5%Ni–CeO_(2)catalyst was prepared and characterized by a wide array of methods X-ray diffraction,X-ray photoelectron spectroscopy,temperature programmed reduction,scanning electron microscope,BrunauerEmmett-Teller analysis,and thermogravimetric analyzer.The catalytic run was executed between 200 and 500℃in a flow reactor.The deployed catalytic methodology displayed a profound HDO capacity.At 400℃,for instance,the gas chromatography mass spectroscopy(GC–MS)detected loads of paraffin and aromatic compounds exists at appreciable values of 48.0%and 28.5%,respectively.With a total relative yield of 43.2%(at 400℃),C8–C15 species(i.e.,jet fuel fractions)were the most abundant species in the upgraded SB bio-oil.The release of H_(2),CO,CO_(2),and CH_(4)was analyzed qualitatively and quantitatively using gas chromatography thermal conductivity detector and Fourier infrared spectroscopic analysis.When the Ni–CeO_(2)catalyst was utilized,a complete deoxygenated bio-oil was obtained from SB seeds using the surface-assisted HDO reaction.On the basis of the elemental analysis,the biochar’s hydrogen and oxygen contents were found to decrease significantly.Density functional theory computations showed mechanisms for reactions that underpinned the experimentally observed hydrodeoxygenation process.Outcomes presented herein shall be instrumental toward the effective utilization of halophyte in the production of commercial transportation fuels.展开更多
基金National Water and Energy Center at the United Arab Emirates University,UAEU(No.12R124).
文摘Because of socioeconomic considerations,wide-scale production of biofuel necessitates the utilization of nonedible biomass feedstock that does not compete for land and fresh water resources.In this regard,Salicornia bigelovii(SB)is the most investigated halophyte species.The high oil content in SB seeds has sparked mounting research that aims to utilize SB as an industrial crop in the production of bio-oil,particularly in coastal areas where these plants thrive.However,the oil extracted from the pyrolysis of raw SB seeds is largely dominated by oxygenated fatty acids,most notably 9,12-octadecadienoic acid and 9,17-octadecadienal,typical to that of other crops.The pyrolysate bio-oil of the raw SB seeds exhibited a relative yield of oxygenated compounds that decreased from 57.05%at 200℃to 9.81%at 500℃,and the relative yield of nitrogenated compounds increased from 4.86%at 200℃to 21.97%at 500℃.To improve the quality of the produced bio-oil,herein we investigated the catalytic hydrodeoxygenation(HDO)of the fragments that were produced from the thermal degradation of SB seeds.A 5%Ni–CeO_(2)catalyst was prepared and characterized by a wide array of methods X-ray diffraction,X-ray photoelectron spectroscopy,temperature programmed reduction,scanning electron microscope,BrunauerEmmett-Teller analysis,and thermogravimetric analyzer.The catalytic run was executed between 200 and 500℃in a flow reactor.The deployed catalytic methodology displayed a profound HDO capacity.At 400℃,for instance,the gas chromatography mass spectroscopy(GC–MS)detected loads of paraffin and aromatic compounds exists at appreciable values of 48.0%and 28.5%,respectively.With a total relative yield of 43.2%(at 400℃),C8–C15 species(i.e.,jet fuel fractions)were the most abundant species in the upgraded SB bio-oil.The release of H_(2),CO,CO_(2),and CH_(4)was analyzed qualitatively and quantitatively using gas chromatography thermal conductivity detector and Fourier infrared spectroscopic analysis.When the Ni–CeO_(2)catalyst was utilized,a complete deoxygenated bio-oil was obtained from SB seeds using the surface-assisted HDO reaction.On the basis of the elemental analysis,the biochar’s hydrogen and oxygen contents were found to decrease significantly.Density functional theory computations showed mechanisms for reactions that underpinned the experimentally observed hydrodeoxygenation process.Outcomes presented herein shall be instrumental toward the effective utilization of halophyte in the production of commercial transportation fuels.
