共查询到19条相似文献,搜索用时 63 毫秒
1.
2.
3.
在DMF/H2O/CH3OH的混合体系中,反应温度为170℃,Mn SO4·4H2O盐溶液在p H=5和7的条件下,加热72小时,最终得到了结构不同的硫酸锰骨架[Mn2(SO4)3]·(H3O)2(1)和[Mn3(SO4)2(OH)2(H2O)2](2)。化合物结构通过单晶X-射线和红外光谱所表征,相应的晶胞参数:化合物1,立方晶系,空间群:P213,a=10.2009(12),V=1061.49(37)3,Goo F=1.158,Flack parameter 0.02(2),R1=0.0186(I2sigma);化合物2,四方晶系,空间群:Pbcm,a=7.3214(15),b=9.984(2),c=13.291(3),V=971.5(4)3,Goo F=1.063,R1=0.0227(I2sigma);单晶X射线分析显示化合物1是一个三维单手性硫酸锰骨架,化合物2是一个非手性羟基硫酸锰骨架。实验结果说明,p H值对硫酸锰骨架的改变起重要作用。 相似文献
4.
5.
6.
以硫酸锰作催化剂无汞快速测定COD 总被引:5,自引:0,他引:5
在硫酸、磷酸混合液中以MnSO4作催化剂无汞快速测定水的化学需氧量(COD)。通过实验,该法的最佳测定条件为:MnSO4 0.2 g,H2SO4-H3PO4 20 mL(H2SO4∶H3PO4= 5∶1体积比),回流时间15 min。 相似文献
7.
采用冷原子吸收光谱法测定饲料添加剂硫酸锰中的汞含量,研究了测定介质及其浓度、重铬酸钾用量、还原剂用量、共存元素干扰等因素对测定的影响,方法的加标回收率为96%~103%,样品测定相对标准偏差10%,能满足日常检验的要求。 相似文献
8.
应用单位键指标-二次指数势(UBI-QEP)方法对汽车尾气净化反应中氮氧化物的分解进行了理论分析.结果表明,NOx的分解的可能途径为氮氧化物的直接分解、CO还原助解和氮助解离.在富氧条件下,以CO助解为主.NO的解离存在N2O中间态.Ni与Rh一样,也是优秀的还原NOx催化剂,若能有效克服表面氧的共吸附,Ni-Cu可能是良好的汽车尾气净化催化剂的主体成份. 相似文献
9.
对孝义 不同电解体系中的脱硫率进行了考察。对不同电解氢气和不同助剂的影响进行了研究。发现NaOH和H2SO4均是较好的脱硫体系,Cl^-对电解脱硫有明显的促进作用,但对煤质的破坏程度很大。对煤的电解脱友规律的研究表明,碱性体系中的电解反应为包括脱硫反应的综合反应,对煤为一级,表观活化能为41.88kJ/mol。 相似文献
10.
11.
12.
Study of SO2 Removal Using Non-thermal Plasma Induced by Dielectric Barrier Discharge (DBD) 总被引:10,自引:0,他引:10
Hongbin Ma Paul Chen Minglang Zhang Xiangyang Lin Roger Ruan 《Plasma Chemistry and Plasma Processing》2002,22(2):239-254
Dielectric Barrier Discharge (DBD) non-thermal plasma reactors built with three different dielectric materials for SO2 removal were studied. The discharge characteristics of the three dielectrics, namely glass, Teflon, and glass fiber-based epoxy resin, were analyzed using Lissajous figures. From the Lissajous figures, the transition charge and energy deposition for each dielectric material were determined. When both the discharge characteristics and mechanical processability were considered, glass fiber-based epoxy resin was regarded as the best dielectric barrier among the three for DBD plasma reactors. A multi-cell DBD reactor built with glass fiber-based epoxy resin was used for treating air stream containing SO2. SO2 % removal decreased with increasing initial SO2 concentration in a biphasic fashion. SO2 removal was greatly improved by adding NH3 into the air stream. Raising the relative humidity of the air stream also helped SO2 removal. A SEM (scanning electron microscope) test illustrated some changes in surface morphology of Teflon and glass fiber-based epoxy resin. 相似文献
13.
研究了高氯酸氧化-硫酸亚铁铵滴定法测定锰渣中锰含量的主要影响因素。采用磷酸分解试样,通过控制试样质量和磷酸用量的比例,优化确定了最佳溶样温度和溶样时间,探讨了放置冷却时间对测定结果的影响程度,分析了共存离子的干扰。建立了硫酸亚铁铵滴定法测定锰渣中的锰含量的方法,方法用于对锰渣标准物质和样品进行分析,测定结果的相对标准偏差为0.21%~0.35%,准确度和精密度均能满足锰渣中锰含量的分析要求。 相似文献
14.
15.
Tingzhen Li Yong Yang Zhichao Tao Haijun Wan Xia An Chenghua Zhang Hongwei Xiang Yongwang Li 《天然气化学杂志》2007,16(4):354-362
The effect of sulfate on Fischer-Tropsch synthesis performance was investigated in a slurry- phase continuously stirred tank reactor(CSTR)over a Fe-Mn catalyst.The physiochemical properties of the catalyst impregnated with different levels of sulfate were characterized by N_2 physisorption,X-ray photoelectron spectroscopy(XPS),H_2(or CO)temperature-programmed reduction(TPR),Mφssbauer spectroscopy,and CO_2 temperature-programmed desorption(TPD).The characterization results indicated that the impregnated sulfate slightly decreased the BET surface area and pore volume of the catalyst, suppressed the catalyst reduction and carburization in CO and syngas,and decreased the catalyst surface basicity.At the same time,the addition of small amounts of sulfate improved the activities of Fischer- Tropseh synthesis(FTS)and water gas shift(WGS),shifted the product to light hydrocarbons(C_1-C_(11)) and suppressed the formation of heavy products(C_(12 )).Addition of SO_4~(2-)to the catalyst improved the FTS activity at a sulfur loading of 0.05-0.80 g per 100 g Fe,and S-05 catalyst gave the highest CO conversion(62.3%),and beyond this sulfur level the activity of the catalyst decreased. 相似文献
16.
17.
P. D. Robinson S. Jasty 《Acta Crystallographica. Section C, Structural Chemistry》1998,54(6):IUC9800021-IUC9800021
18.
19.
火焰原子吸收光谱法测定硫酸铜中锰和铬 总被引:4,自引:0,他引:4
邵海青 《理化检验(化学分册)》2003,39(3):184-184,186
硫酸铜中通常分析项目比较简单 ,但在出口产品中要求分析锰和铬。由于其含量甚微 [w(Mn) <0 0 0 0 2 % ,w(Cr) <0 .0 0 1% ],直接用火焰原子吸收光谱法达不到目的 ,但经溶剂萃取后测定可降低测定下限[1] ,石墨炉原子吸收光谱法有较高的灵敏度[2 ,3] ,但设备昂贵不易普及。本文采用电解法分离基体铜 ,电解液即可用作火焰原子吸收测定 ,方法简单、快速 ,灵敏度能满足要求 ,准确度较高 ,标准回收好。1 试验部分1.1 仪器与试剂GBC932型火焰原子吸收分光光度计 (澳大利亚GBC公司 )44B型电解仪 (上海雷磁仪器厂 )锰标准溶液 :0 .1… 相似文献