硫化镉光催化氧化1,4-二苯基丁二烯的反应

本文研究了在乙腈溶剂中硫化镉粉末光催化氧化反,反-1,4-二苯基-1,3-丁二烯的反应。认为反应历程是经负氧离子(O₂^·-)与底物正离子自由基反应进行。发现水、二氧化钛、亚硫酸钠对反应有促进作用,讨论了其影响反应的原因。认为可通过加入电子转移物质减少半导体光生电子-空穴对的复合来提高半导体光催化效率。     

Heterocyclization of Bis(2-chloroprop-2-en-1-yl)sulfide in Hydrazine Hydrate–KOH: Synthesis of Thiophene and Pyrrole Derivatives

The article is devoted to heterocyclization of bis(2-chloroprop-2-en-1-yl)sulfide which proceeds in hydrazine hydrate–alkali medium and leads to formation of thiophene and pyrrole derivatives: previously described 4,5,9,10-tetrahydrocycloocta[1,2-c;5,8-c’]dithiophene, as well as unknown hydrazone of 5-methylidene-3-methyldihydrothiophen-2-one and 1-amino-2-(propynylsulfanylpropenylsulfanyl)-3,5-dimethylpyrrole. Tentative mechanisms for the formation of the heterocyclic products are discussed. Obtained hydrazone of 5-methylidene-3-methyldihydrothiophen-2-one was used for the synthesis of a range of azine derivatives and in oxidation process with SeO₂. The found reactions open up expedient approaches to the formation of various hardly accessible thiophene and pyrrole compounds from 2,3-dichloropropene and elemental sulfur as starting reagents.     

多相光催化分解H2S中阴离子表面活性剂对半导体催化剂CdS表面的影响

研究了在H₂S碱性溶液中,CdS粉末催化剂存在时,光催化分解H₂S释氢和生成硫反应。考察了阴离子表面活性剂——十二烷基硫酸钠(SDS)对催化剂的表面性质和催化活性的影响。通过模拟该反应体系,用电化学方法测定了单晶CdS电极在上述反应体系中加入SDS(浓度低于临界胶团浓度CMC值)后的平带电位的变化。结果表明:单晶CdS电极的平带电位,由于该体系加入SDS而正移,与n型多晶半导体CdS在加入SDS的H₂S碱性溶液中,光催化分解H₂S的释氢量减少相一致。并探讨了在该体系中,由于表面活性剂的阴离子与S^2-在单晶CdS电极表面上的竞争吸附,而引起单晶CdS电极的平带电位正移。     

铁锰渣催化氧化BaS制取Ba(OH)_2的研究

本文研究了用精制ZnSO4中的水合二氧化锰和三氧化二铁废渣作催化剂,用空气氧化BaS溶液,制取Ba（OH）2的反应条件。     

表面活性剂和溶液pH对硫化钠溶液线性电位扫描的影响

用电解方法分解硫化氢成为单质硫和氢气的研究对环境保护和资源回收均具有重要实际意义［１～４］．然而,由于电解产物硫在阳极表面的沉积,导致电解电流急剧下降,电极反应几乎停止,这一现象称为阳极钝化,它是硫化氢碱性溶液（用Ｎａ２Ｓ代替）电解产生单质硫这一过程的主要障碍．文献上对消除阳极钝化作了许多研究报道,但效果并不明显［５～１０］,或因处理过程的步骤增加,能耗较大［１１］．作者曾报道过阳离子表面活性剂ＨＴＡＢ对消除硫在石墨阳极表面的沉积有良好效果,并在ＨＴＡＢ存在下能通过控制适当的电流密度,顺利实现硫…     

A Clean,Mild, and Selective Oxidation of Sulfides to Sulfoxides Using NaClO/H2SO4 in Aqueous Media

A range of sulfides can be selectively oxidized to the corresponding sulfoxides in good yields using NaClO/H₂SO₄ in both water and 50:50 water:EtOH as solvent. Two new compounds are reported that show a diastereoselective oxidation in 2-phenylthioalcohols with possible neighboring hydroxyl group participation with a logic proposed mechanism.     

New Germaheterocycles,Germadithioacetals and a Germylated Oxide and Sulfide Derived from Cysteamine,Methylcysteamine and N-Substituted Cysteamine: Synthesis and Radioprotective Activity

Further to our work concerning organometallic compounds active in chemical radioprotection, we report the synthesis and pharmacological study (radioprotective activity, toxicity) of new germathiazolidines and germadithioacetals derived from cysteamine, methylcysteamine and N -substituted cysteamine. A germylated oxide and sulfide with methylcysteamine hydrochloride as ligand were also investigated. A notable decrease in the toxicity and a fairly large increase in the radioprotective activity of these new organogermylated compounds were observed compared with cysteamine, methylcysteamine and N -substituted cysteamine.     

硫化条件对加氢裂化催化剂金属硫化度的影响

采用高压连续微反装置及X -射线光电子能谱 (ESCA)等仪器 ,考察了不同硫化条件对加氢裂化催化剂中活性组分的存在状态及价态分布的影响。研究表明 :在整个硫化温度区间内 ,2 30℃时催化剂硫化速率较快 ,在此温度下需要恒温硫化 ,较佳恒温时间为 3h ,压力 (>4 5MPa)对催化剂硫化度有一定的影响 ,不同组成的催化剂其硫化性能也不同。在催化剂硫化过程中 ,W5 是硫化过程中的一种中间过渡产物 ,随硫化温度的升高可转化为W4 。     

聚-4-氧杂-6,7-双甲硫基庚基硅氧烷铂络合物的合成及其对烯烃硅氢加成反应的催化特性

4-氧杂-6,7-双甲硫基三甲氧基硅烷用气相法二氧化硅固载,再与氯亚铂酸钾作用,合成了双齿型硫醚铂络合物——聚-4-氧杂-6,7-双甲硫基庚基硅氧烷铂络合物。它对烷氧基硅烷与烯烃的硅氢加成反应具有良好的催化活性和突出的回收再用性能。其结构通过元素分析和XPS进行了表征。     

稀土氧硫化物上的羰基硫水解反应

研究了一种新型的羰基硫水解催化剂--稀土氧硫化物.考察了稀土系列氧化物硫化后的水解活性,发现其活性顺序为La≈Pr≈Nd≈Sm>Eu>Ce>Gd≈Ho>Dy>Er.XRD物相分析表明,各种稀土氧化物经水合及硫化后呈现出不同的物相变化特性,稀土氧硫化物是COS水解的活性物质.在氧硫化镧和氧硫化钕催化剂上研究了O₂和SO₂对羰基硫水解反应的影响,与传统的氧化铝基和氧化钛基水解催化剂相比,稀土氧硫化物显示出良好的抗氧化性能,而SO₂对催化活性的影响是可逆的.