Simultaneous Removal of COS and H2S at Low Temperatures over Nanoparticle α-FeOOH Based Catalysts

Catalysts using α-FeOOH nanoparticles as the active ingredient were tested by a microreactorchromatography assessing apparatus at atmospheric pressure between 25 and 60℃ with a gas hourly space velocity of 10,000h^-1,while the removal performance of H2S with catalysts was investigated using the thermal gravimetric method.The results show that the catalysts are highly active for COS hydrolysis at low temperatures(≤℃）and high gas hourly space velocity,and the highest activity can reach 100%.The catalyst is particularly stable for 12h,and no deactivation is observed.Nanoparticle α-FeOOH prepared using hydrated iron sulfate shows higher COS hydrolysis activity,and the optimum calcination temperature for the catalyst is 260℃.In addition,the catalysts can remove COS and H2S simultaneously,and 60℃ is favorable for the removal of H2S.The compensation effect exists in nanoparticle-based catalysts.     

STUDY ON XPS OF IRON CATALYSTS

IntroduCtioniron-basedcatalystSareactiveinformingliquidfuelsfromthehydrogenationofCO[l~6].However,itiswellknownthatthepoisoningofironcatalystsespeciallythesulfurandoXygenisoneofthemostseriousdeactivationproblemsincommercialproduCtionofsubstitUtenatUralgas…     

改性活性炭纤维脱除低浓度COS后的再生研究

分别用溶剂再生和气体热再生的方法对脱低浓度氧硫化碳(COS)失活后的改性活性炭纤维(ACF)进行再生。考察了再生后的改性ACF的脱硫性能,研究再生时间、再生温度等对ACF再生效果的影响。结果表明,溶剂再生和气体热再生都有效果。其中,溶剂法中用水再生的效果较好;气体热再生中用N2再生的效果较好。     

Initial activity of acidic, basic and amphoteric oxides in the reaction of CO2 with CS2 to form COS

Among various acidic, basic and amphoteric oxides La₂O₃ and ThO₂, both having strong ionic character and peculiar acid-base properties, exhibited outstanding initial catalytic activity in the CO₂+CS₂=2COS reaction.     

COS分子红外谱的群论计算

利用Ｕ（５）模型给出了ＣＯＳ分子的振转能级,并且用标准的群论方法计算了ＣＯＳ分子的红外吸收谱线的强度。结果与实验较好的符合。     

Secondary Metabolism Rearrangements in Linum usitatissimum L. after Biostimulation of Roots with COS Oligosaccharides from Fungal Cell Wall

In vitro culture of flax (Linum usitatissimum L.) was exposed to chitosan oligosaccharides (COS) in order to investigate the effects on the growth and secondary metabolites content in roots and shoots. COS are fragments of chitosan released from the fungal cell wall during plant–pathogen interactions. They can be perceived by the plant as pathogen-associated signals, mediating local and systemic innate immune responses. In the present study, we report a novel COS oligosaccharide fraction with a degree of polymerization (DP) range of 2–10, which was produced from fungal chitosan by a thermal degradation method and purified by an alcohol-precipitation process. COS was dissolved in hydroponic medium at two different concentrations (250 and 500 mg/L) and applied to the roots of growing flax seedlings. Our observations indicated that the growth of roots and shoots decreased markedly in COS-treated flax seedlings compared to the control. In addition, the results of a metabolomics analysis showed that COS treatment induced the accumulation of (neo)lignans locally at roots, flavones luteolin C-glycosides, and chlorogenic acid in systemic responses in the shoots of flax seedlings. These phenolic compounds have been previously reported to exhibit a strong antioxidant and antimicrobial activities. COS oligosaccharides, under the conditions applied in this study (high dose treatment with a much longer exposure time), can be used to indirectly trigger metabolic response modifications in planta, especially secondary metabolism, because during fungal pathogen attack, COS oligosaccharides are among the signals exchanged between the pathogen and host plant.     

K_2O修饰γ－Al_2O_3的表面性能研究

本文利用ＥＰＭＡ、ＸＰＳ和ＦＴＩＲ等物理方法，研究了浸渍Ｋ２Ｏ以后的γ－Ａｌ２Ｏ３的表面组成、表面羟基性质、表面酸碱性以及表面各元素电子结合能的变化。实验结果表明，γ－Ａｌ２Ｏ３经Ｋ２Ｏ修饰以后，表面Ｋ／Ａｌ比大于本体Ｋ／Ａｌ比，Ｋ２Ｏ富集在γ－Ａｌ２Ｏ３的表面上；Ｋ２Ｏ在表面上起到了抑制酸性，增强碱性包括羟基碱性的作用；表面碱性中心种类增多、碱性增强、分布增宽的主要原因是表面氧的电负性增强和铝在一定程度上的还原。     

羰基硫对FT合成气液相产物的影响

在５２４Ｋ，２．３１ＭＰａ，１８４５ｈ＾－１，Ｈ２／ＣＯ＝２．１的条件下考察了合成气中ＣＯＳ对下合成催化剂活性及产物分布的影响，结果表明，随着催化剂中硫含量的增加，尾气中ＣＯ２，ＣＨ４，含量减少，ＣＯ含量增加，催化剂中毒后，甲烷选择明显提高，Ｃ５重量百分含量降低，气态Ｃ２～Ｃ４烃增加了产物向低碳烃方向移动。油相和水相的产物分析结果表明，催化剂中毒后，气物中含氧化合物增加，液态烃中烯烃减少，正构烷烃