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Effect of binder on the properties of iron oxide sorbent for hot gas desulfurization 总被引:1,自引:0,他引:1
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Fang Zhu Chunhu Li Huilin Fan .College of Environmental Science Technology Taiyuan University of Technology Taiyuan Shanxi China .Key Laboratory of Coal Science Technology Ministry of Education Institute for Chemical Engineering of Coal .Key Laboratory of Marine Chemistry Theory Technology of Ministry of Education Ocean University of China Qingdao Sh ong 《天然气化学杂志》2010,19(2):169-172
The most difficult problem in hot gas desulfurization in Integrated Coal Gasification Combined Cycle (IGCC) is the pulverization of sulfur removal sorbents. Appropriate binders for hot gas sulfur removal sorbents can solve the pulverization problem. In this paper, six sorbents with binders of different argillaceous minerals were prepared by mechanical mixing method. Desulfurization behavior for hot gas desulfurization sorbents was investigated in a fixed-bed reactor. Result showed that sorbent NTKW2 with binder of clay had a better sulfidation performance. NTKW2 had a more stable performance than other sorbents in the continuous sulfidation-regeneration cycles. Sulfur capacity of sorbent remained the same in each cycle. The desulfurization efficiency and mechanical strength of NTKW2 were the best among the tested sorbents. The behavior of NTKW2 at different temperatures showed different performances, and the best reaction temperature was 550 ℃. Higher heat stability, sulfur capacity and desulfurization efficiency were found on NTKW2 in six continuous sulfidation-regeneration cycles. 相似文献
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8-羟基喹啉铝类有机金属配合物作为一类重要的发光材料广受关注.文章合成并通过真空升华提纯得到了一种高纯度的8-羟基喹啉铝的衍生物-三(2-甲基-8-羟基喹啉)铝,通过红外光谱、核磁共振谱以及元素分析确定了三(2-甲基-8-羟基喹啉)铝的分子结构.通过热重和差示扫描量热分析研究了三(2-甲基-8-羟基喹啉)铝的热稳定性,试验结果表明:此衍生物的结晶转变温度可达158℃,分解温度为357℃;并进一步通过紫外可见吸收光谱和荧光光谱表征了材料的带隙以及能带结构.将吸收边的线性关系延伸到与能量轴相交所得禁带宽度2.85 eV,三(2-甲基-8-羟基喹啉)铝在365 nm紫外光的激发下,在乙醇溶液体系中的荧光发射峰在479 nm处,为蓝色荧光,荧光量子效率高,是一种蓝光发射的优选材料. 相似文献
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咖啡酸及其衍生物光谱特性研究 总被引:4,自引:0,他引:4
研究了不同pH值条件下 ,咖啡酸类化合物溶液的荧光及紫外光谱特性。实验结果表明 :咖啡酸类化合物有很宽的pH发光范围 (2~ 1 2 ) ,发光强度、光谱形状及峰位随pH值不同而异 ,且在pH =9~ 1 0时 ,咖啡酸类化合物荧光强度最强。研究还发现 :咖啡酸类化合物 4 位酚羟基的解离可导致荧光强度显著增强 ,而 3 位酚羟基的解离可能会导致荧光猝灭 ,并且在强酸和强碱介质中发射荧光均被显著猝灭 ;此外 ,在强碱性介质中紫外光谱形状有很大变化 ,表明咖啡酸类化合物在强碱性下分子结构发生了明显改变。 相似文献
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活性炭富集ICP-AES法测定铜精矿中微量金 总被引:3,自引:0,他引:3
采用ICP-AES法对铜精矿中微量金进行了测定。样品首次采用灼烧,酸分解,活性炭吸附富集等步骤进行了预处理。结果表明,该方法的检出限为0.028μg·mL-1。相对标准偏差(RSD)小于2%。该方法简便,可靠,准确。 相似文献
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通过溶胶-凝胶法,在碱性条件下水解缩聚正硅酸乙酯获得含有SiO2颗粒的溶胶;以甲基三乙氧基硅烷在酸性条件下水解缩聚获得双链聚合物溶液,作为疏水基团的引入剂。用两者的混合物在玻璃片上旋转镀膜。利用光子相干光谱法、透射电子显微镜、小角X射线散射等方法研究了溶胶微结构,利用紫外-可见光谱仪和接触角测定仪测量薄膜的透射率和疏水性。单面反射率最低降至0.01%,对水接触角最高为118°。利用Nd:YAG激光(1 064nm)测量了薄膜的激光损伤阈值,随混合溶胶中双链聚合物含量的增加损伤阈值减小,但均高于20J/cm2(1ns脉冲)。由于薄膜既保持了纳米氧化硅薄膜的多孔性,又在颗粒及孔表面以甲基修饰,水对薄膜的浸润能力大大降低,因此薄膜的时间稳定性大大增强,同时也保证了较高的损伤阈值和透射率。 相似文献
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LeiLIU GaoYongZHANG JinXiangDONG: 《中国化学快报》2004,15(6):737-740
Following hydrothermal synthesis process, MCM-41 was synthesized by using cetyltfiethylammonium bromide as templating agent. The experimental results showed that MCM-41 with pore diameter in the range of 4-7 nm can be obtained by adjusting nSurf./nSi. It was proved that cetyltriethylammonium bromide is an effective templating agent for increasing pore diameter of molecular sieve MCM-41. 相似文献
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Molecular modeling of the binding mode of chiral metal complexes A- and A-[Co(phen)_2dppz]~(3 ) with B-DNA 总被引:1,自引:0,他引:1
Molecular modeling methods have been applied to the structural characterization of the interaction between chiral metal complexes [Co(phen)2dppz]3 (where phen = 1, 10-phenanthroline, dppz = dipyrido[3,2-a: 2', 3'-c]phenazine) and the oligonucleotide (B-DNA fragment). The natures of two kinds of the binding modes, which are currently intense controversy, have been explored. Barton proposed that there is enantio-selective DMA binding by the octahedral complexes and intercalative access by these complexes from the major groove; but Norden suggested that both enantiomers bind extremely strongly to DNA from the minor groove without any noticeable enantio-selectivity. Our results support and extend structural models based upon Norden's studies, and conflict with Barton's model. 相似文献
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