用丁钠橡胶制备钠催化剂及应用的工业试验

对用了钠橡胶为载体制备钠催化剂，并用于生产丁钠橡胶和工业试验进行了探讨，取得了成功，缩短了工艺流程，降低了生产成本。

异戊二烯二聚钠系催化剂的制备与研究

在恒温 -磁力搅拌实验装置上考察了金属钠负载在不同载体 Al2 O3 、分子筛、稀土氧化物(Ce O2 、L a2 O3 、Sm2 O3 )和 Mg O上 ,在添加剂 DIPA/ TEA的作用下对异戊二烯二聚的影响 ,发现酸性载体不利于二聚的形成 ;稀土氧化物作载体 ,虽有同类萜烯化合物的结构获得 ,但产率较低 ;而负载在碱土金属氧化物上 ,其中碱土中的 Mg O表现出较好的二聚结果 ,这也许与 Mg O的晶粒细化及载体碱性密切相关 ,它更有利于金属钠的负载及分散 ,以提供更多的有效活性中心数目 .

分子筛载体对Pt-Sn-Na三组分丙烷脱氢催化剂性能的影响

采用等体积分步浸渍法,分别以不同n(SiO_2):n(Al_2O_3)的ZSM-5和β分子筛以及以一定比例机械混合的ZSM-5和β分子筛为载体,制备负载型Pt-Sn-Na三组分丙烷脱氢催化剂,在固定床微型反应装置上对制备的催化剂进行了丙烷脱氢性能评价,并采用NH_3-TPD方法对催化剂进行了表征。实验结果表明,以n(SiO_2):n(Al_2O_3)=100的ZSM-5分子筛和n(SiO_2):n(Al_2O_3)=80的β分子筛进行机械混合得到的混合分子筛为载体,制备的Pt-Sn-Na/ZSM-5-β催化剂的丙烷脱氢性能较好,在n(H_2):n(C_3H_8)=1:1、C_3H_8的重时空速2 h^(-1)、反应压力0.1 MPa、反应温度600℃的条件下,丙烷转化率约为28.0%,丙烯选择性大于等于98.6%。

QHS-3型钠钙浮选剂用催化剂生产过程中含铜、镍离子废水的处理

对QHS-3型钠钙浮选剂用催化剂生产过程中产生的含铜、镍离子废水采用常规中和沉淀法与加入金属螯合剂M相结合的方法进行了去除铜、镍离子的研究,结果表明:在最佳工艺条件下,即在溶液的pH值为9.2,聚丙烯酰胺(PAM)加入量为6mg/L,金属螯合剂M投加量为80～90mg/L时,处理后的废水中的铜、镍离子的质量浓度达到了国家排放标准。

NaZnPO_4催化Knoevenagel缩合反应

以磷酸锌钠为催化剂,催化苯甲醛与氰乙酸乙酯进行Knoevenagel缩合反应.用熔点测定仪,IR,GC-MS表征了缩合产物,结果表明缩合产物为α-氰基肉桂酸乙酯.产物的总产率为81.1%,其中反式产物与顺式产物的比例分别为98.2%,1.8%.本文的实验结果表明,磷酸锌钠无须负载任何东西,其本身就是一种催化芳香醛和活泼亚甲基化合物发生Knoevenagel缩合反应的良好催化剂,该反应可在温和的条件下高效地进行,产品产率高、纯度好、操作和后处理简单方便.

羰基钴催化羰化合成丙二酸二乙酯

作者报道了在温和条件下 ,以保险粉 (Na2 S2 O4 )和Zn粉作助剂 ,用CO和氯化钴原位合成的Na[Co(CO) ]4 作催化剂 ,催化氯乙酸乙酯的羰化反应合成丙二酸二乙酯 .对催化体系的选择进行了考察 。

钯类催化剂在形成碳－碳单键反应中的应用

钯催化反应是广泛被用于有机合成的简单而又重要的反应。主要综述钯类催化剂在形成碳－碳单键反应中的应用，着重阐述了卤代烃与有机金属化合物、烯烃、炔烃的交联反应。

PtSnNa/SUZ-4:An efficient catalyst for propane dehydrogenation

The structure and catalytic properties of PtSn catalysts supported on SUZ-4 and ZSM-5 zeolite have been studied by using various experimental techniques including XRD,nitrogen adsorption,NH3-TPD,TG,H2-TPR and TPO techniques combined with propane dehydrogenation tests.It has been shown that SUZ-4-supported PtSnNa（PtSnNa/SUZ-4） was determined to be a better catalyst for propane dehydrogenation than conventional catalysts supported on ZSM-5,owing to its higher catalytic activity and stability.Dibenzothiophene poisoning experiments were performed to investigate the detailed structures of the two supported catalysts.The characterization of the two catalysts indicates that the distribution of Pt on the porous support affects the activity.In contrast to ZSM-5-supported catalysts,Pt particles on the PtSnNa/SUZ-4 are primarily dispersed over the external surface and are not as readily deactivated by carbon deposition.This is because that the strong acid sites of the SUZ-4 zeolite evidently prevented the impregnation of the Pt precursor H_2PtCl_6 into the zeolite.In contrast,the weak acid sites of the ZSM-5 zeolite led to more of the precursor entering the zeolite tunnels,followed by transformation to highly dispersed Pt clusters during calcination.In the case of the PtSnNa/ZSM-5,the interactions between Sn oxides and the support were lessened,owing to the weaker acidity of the ZSM-5 zeolite.The dispersed Sn oxides were therefore easier to reduce to the metallic state,thus decreasing the catalytic activity for hydrocarbon dehydrogenation.

Influence of TiC catalyst on absorption/desorption behaviors and microstructures of sodium aluminum hydride

TiC-doped NaA1H4 complex hydrides were prepared by hydrogenation of ball-milled Nail/A1 mixture with x TiC powder （x = 0, 5%, 8%, 10%, mole fraction）. The effects of TiC catalyst content on the absorption/desorption behaviors of the samples were investigated. The results show that TiC can improve the hydriding/dehydriding kinetics of sodium aluminum hydride, the hydriding rate of the sample increases with increasing TiC content. It is found that the TiC-doped NaA1H4 composites have a relatively good cyclic stability. The composite doped with 10% TiC maintains steadily about 4.5% （mass fraction） hydrogen absorption capacity as against about 3.8% （mass fraction） hydrogen desorption capacity over 8 cycles. The particle sizes of the TiC-doped NaA1H4 composites can be reduced to 50-100 nm, which may play an important role in improving the hydriding/dehydriding kinetics.

加压下甲烷氧化偶联反应工艺条件的研究

报道了Na W Mn催化剂加压条件下的甲烷氧化偶联反应性能 ,详细考察了反应条件对Na W Mn催化剂反应性能的影响。结果表明 ,Na W Mn催化剂在较高压力条件下依然具有良好的甲烷氧化偶联反应性能 ,在烷氧比 8、温度 75 0℃、空速 1 5× 10 5h 1、压力 0 6MPa无稀释气的最佳实验条件下 ,可以得到 16 %的甲烷转化率和 82 %的C2 + 烃选择性。

3,4-聚异戊二烯橡胶3,4-ПИ的性能

用独创的生态型纯可溶解的钠-镁有机化合物作催化剂,合成了不同乙烯基链段含量和不同分子量的3,4-聚异戊二烯橡胶(3,4-ПИ)。该橡胶的α'-转变温度接近室温。3,4-ПИ橡胶的热稳定性、气密性及弹性阻尼性能良好。不同分子量及不同微观结构的3,4-ПИ有良好的互溶性,由此可调节T'α。3,4-ПИ是颇有发展前途的新型阻尼材料、吸音材料和粘合材料,可用于航空、船舶和汽车制造业。

Precipitation of antimony from the solution of sodium thioantimonite by air oxidation in the presence of catalytic agents

The behavior of antimony oxidation in the solution of sodium thioantimonite was studied in the presence of catalytic agents. The catalytic effects of the respective addition of cupric sulfate, sodium tartrate, potassium permanganate, phenol, 1,2 dihydroxybenzene and their combination on the oxidation of sodium thioantimonite were investigated. A pilot test was carried out. The results show that the respective use of sodium tartrate, cupric sulfate, potassium permanganate, phenol and 1,2 dihydroxybenzene have little catalytic effect on the oxidation of sodium thioantimonite. However there exists obvious catalytic oxidation by the combination of 0.25 g/L 1,2 dihydroxybenzene, 0.5 g/L potassium permanganate and 1.0 g/L phenol. Moreover, high blast intensity, the increase of temperature and NaOH concentration favor the oxidation of antimony. The oxidation process of antimony has such advantages as quick reaction and low operation costs. The results of the pilot test are consistent with those of laboratory experiments.

Continuous production of biodiesel from cottonseed oil and methanol using a column reactor packed with calcined sodium silicate base catalyst

Sodium silicate and that calcined at 400℃ for 2 h were used to catalyze the transesterification of cottonseed oil with methanol. Calcined sodium silicate （CSS） catalyst exhibited much higher catalytic activity and stability. A maximum biodiesel yield of 98.9~ was achieved at methanol/oil mole ratio of 12：1, reaction temperature 65℃, reaction time 3.0 h, and CSS/oil mass ratio of 2 Wffo. After 7 consecutive reactions without any treatment, biodiesel yield reduced to 82.5%. Considering technological and economic feasibility, CSS base catalyst supported on 0 rings was prepared for continuous transesterification. The maximum yield was 99.1% under optimum conditions （reaction temperature 55 ~C, methanol velocity 1 ml. rain- 1, oil velocity 3 ml- rain- 1, and 5 tower sec- tions）. These results indicate that this new continuous biodiesel production process and apparatus present a great potential for industrial application in biodiesel.

Tert-butylation of Toluene with Tert-butyl Alcohol over Realuminated H-mordenite Zeolite

The realuminated H-mordenite catalysts （HM1-4） treated with different concentrations of NaOH and NaAlO2 aqueous solutions were prepared, and characterized by inductively coupled plasma （ICP）, X-ray diffraction （XRD）, Fourier transform-infrared spectroscopy （FT-IR） and temperature-programmed desorption of ammonia, They are of lower Si/AI ratio and higher acid amount while keeping a high relative crystallinity. Their catalytic performances were evaluated with the liquid-phase tert-butylation of toluene with tert-butyl alcohol in a 100 ml stainless steel batch reactor equipped with a stirrer. HM2 zeolite catalyst, obtained by treating HM in 0.1 mol.L-1 NaOH followed by 0.05 mol·L^-1 NaAlO2 aqueous solution, shows a higher catalytic activity because of its highest acid amount. For HM2 catalyst the influences of reaction conditions on catalytic performance were investigated. The conversion of toluene is 50.3% and the selectivity ofp-tert-butyltoluene is 74.7% at a temperature of 180℃, 2 of molar ratio of tert-butyl alcohol to toluene, 4h of reaction time and 0.2 of M（catalyst）/M（toluene）.

Oxidative Desulfurization of Diesel Fuel with Hydrogen Peroxide Using Na_2WO_4 as Catalyst

Oxidative desulfurization was performed on Na2WO4 catalyst in the presence of hydrogen peroxide and acetic acid under mild reaction conditions （atmospheric pressure and temperature range of 293--343 K）. Different organic compounds including benzothiophene （BT）, dibenzothiophene （DBT）, 4, 6-dimethyl dibenzothiophene （4, 6-DMDBT） were used to investigate the reactivity of this catalyst, and the effect of various parameters, such as temperature, solvents and the amount of oxidant reagent used in oxidative desulfurization reaction, was also examined. The results showed that the Na2WO4- H202 system was very effective for oxidative desulfurization, and the oxidation of BT, DBT and 4, 6-DMDBT was influenced by different parameters.

Photocatalytic Reduction of 6-Chloro-3-Nitrotoluene-4-Sulfonic Acid in Presence of Surfactants

Photocatalytic reduction of 6-chloro-3-nitrotoluene-4-sulfonic acid (CNSA) was studied in UV-irradiated TiO2 suspensions in the presence of methanol and surfactants. A mixture of CNSA, TiO2, water, additives and surfactants was put into a quartz glass reactor with a jacket, which was irradiated with a high pressure Hg lamp in the purging of nitrogen gas. With methanol, the conversion of CNSA increased from 7.7% to 34.6%. Three surfactants significantly promoted the photocatalytic reduction conversion in reduced order of sodium dodecylbenzenesulfonate (DBS), cetyltrimethylammonium bromide (CTAB) and sodium dodecylsulfate (SDS). In suspensions involving DBS and CTAB respectively, CNSA conversion increased in consistence with the adsorption ratio with methanol, but varied inversely with the adsorption ratio without methanol. But no obvious influence on the adsorption ratio was observed with or without methanol added when the SDS concentration was critical micelle concentration (cmc). The photocatalytic reduction of CNSA was enhanced in UV-irradiated TiO2 suspensions in the presence of methanol and surfactants. Methanol inhibited the recombination of photogenerated holes and electrons efficiently. Surfactants around 1 cmc led to the highest reduction conversion.