催化的

This catalyst SO~(2-)_4/TiO_2-SiO_2 has good catalytic effects on esterificational reactions of ethylic acid and emtrol.

研究了影响SO2-4/TiO2-SiO2催化活性的因素及再生的条件，发现其对醋酸和脂肪醇的酯化反应具有良好的催化作用。

Two reasons can be explained the improvements of catalytic activities after the addition of Ce. One is the increase of the thermal stability of Ni-B and Ni-P nanoamorphous alloys, which retards the nanocrystalline Ni to aggregate during the exothermal reaction of benzene hydrogenation. The other is to make their grain sizes smaller, thus it increases the number of activity center in unit mass.

说明加入Ce提高催化活性的主要作用有两方面，一是提高Ni-B和Ni-P纳米非晶态合金的热稳定性，抑制催化苯加氢反应时大量放热促使纳米晶Ni的聚集长大；二是使生成的Ni-B和Ni-P纳米非晶态合金颗粒更为细小，从而增加单位质量样品的活性中心数量。

In this work , 1,8-octodiol, the starting material, reacted with 40% hydrobromic acid to produce 8-bromooctan-1-ol, with the catalytic action of PPTs, its hydroxyl group was protected by 2,3-dihydropyran. Then it coupled with 1-heptaalkyne, by means of P-2 nickel as catalyst, stereoselectivity catalysis hydrogenated, with the catalytic action of acid to take off extremital 2, 3-dihydropyran which protected hydroxy group, then used PCC to oxidize alcohol into corresponding aldehyde.

以1，8-辛二醇为原料，与40%氢溴酸进行单溴代反应，得到8-溴-1-辛醇，在对甲苯磺酸吡啶盐的催化下与2，3-二氢吡喃反应，保护分子中的羟基，再与1-庚炔进行偶联，以P-2镍为催化剂立体选择性催化加氢，酸性条件下脱末端的2，3-二氢吡喃对羟基的保护，使用氯铬酸吡啶盐将醇氧化成醛。

When doping the first periodic transition elements in TiO〓, the relationships between the photocatalytic activities and the ratio of electronic affinity energy to the ionic radius and the ionic magnetic moment of heteratomic ion were studied.

通过第一过渡系元素对纳米TiO〓光催化剂的掺杂，发现催化活性与掺杂元素的稳定氧化态的电子亲和势Ea与离子半径r的比值Ea/r有顺应关系，该比值越大，催化活性越低。

MIPC was photocatalytically transformed to 3,4-dihydroxyl hypnone, 2-iso-butyl phenol and acetic acid, and mineralized ultimately in oxygenated TiO2 slurries. The photocatalytic degradation processed according to first order kinetics with the apparent rate constant depending on initial concentration, light intensity and the amount of catalyst. The amount of catalyst had an optimum value (0.5g/L). The apparent rate was inversely proportional to square root of the initial concentration approximately.

MIPC能被光催化转化成3，4-二羟基苯乙酮、2-异丁基苯酚和乙酸等产物并最终被矿化，MIPC的光催化反应过程符合一级动力学规律，其表观速率常数与MIPC的起始浓度、TiO2量和光强等因素有关，MIPC降解的反应速率与入射光强成正比，与MIPC初始浓度的平方根成反比。

In the synthesis of canthaxanthin by selective catalylitic oxidating of βcarotene,CO2 was used as acidifying or alkalizing agent,which controlled reacting system acidity and protected polyene.,producing less by-products and increasing catalylitic oxidation selectivity.In the addition reaction of isoprene with hypochloric acid,1-chloro-2-methyl-3-buten-2-ol and l-chloro-2-methyl-3-buten-4-ol were made by controlling of the acidity with carbon dioxide i...

CO2作为酸碱调节剂和惰性气体，在β-胡萝卜素催化氧化合成角黄素反应中，可以控制反应体系酸性，保护原料中的双键，减少副反应发生，提高催化氧化反应的选择性；异戊二烯氯醇化生成1-氯-2-甲基-3-丁烯-2-醇和1-氯-2-甲基-3-丁唏-4-醇反应中，CO2代替有机酸作酸碱调节剂，控制次氯酸的生成速度，达到调控反应的目的，反应条件温和，不副产固体。

In addition, ioding was found to be an efficient catalyst for the imino Diels-Alder reaction of N-arylimine and enol ethers and the reaction provided tertrahydroqinolines in good yields. One pot synthesis of tetrahydroqinolines from aldehyde, aniline and enol ethers was also achieved using iodine as the catalyst. The chemical yield of the"one pot"reaction was comparable with that obtained using preformed N-arylimine.

此外我们也发现碘能够有效地催化N-芳基亚胺与烯醇醚的Diels-Alder反应，以很高的化学收率得到了四氢喹啉衍生物，并且发现碘也能够直接催化芳香醛、苯胺、烯醇醚的三组分&一锅&反应，获得的化学产率与使用预制的N-芳基亚胺相当。

The developed catalysts demonstrated good activities towards the Heck reaction of iodobenzene and methyl acrylate with about 90% yield, easy separation after reaction and reusability. The metal leaching was not apparent after four runs.

以碘代苯与丙烯酸甲酯的Heck反应为例，考察双腈基固载Pd的催化性能，肉桂酸甲酯的收率近90％，四次循环使用后催化活性没有明显的降低，Pd的析出并不严重，该催化剂易回收使用。

The results indicate that little conversion of iodobenzene was observed on unmodified carrier supported catalysts; and a conversion of 100% and a selectivity of above 98% to trans-isomers were found over 10%Cu/5%KF/ZnO, 20%Cu/10%KF/ZnO.

结果表明，对碘苯与丙烯酸正丁酯的Heck反应的催化性能，未改性催化剂基本没有活性，而改性后，10%Cu/5%KF/ZnO、20%Cu/10%KF/ZnO催化剂的催化转化率为100%和反式异构体的选择性为98%以上。

The results showed that under 200 W power, in the present of various alkalis, e.g. Na2CO3, NaF, KF, NaHCO3, and DMF-H2O (V∶V=5∶3) used as solvent, PVC-TETA-Pd could catalyze sodium tetraphenylborate to react quantificationally with iodobenzene in 20 min without inert gas protection, and all the phenyl g...

实验发现：在微波功率为200W时，在Na2CO3，NaF，KF，NaHCO3等多种碱的存在下，以DMF的水溶液(V∶V=5∶3)为溶剂，在无惰性气体保护下，PVC-TETA-Pd催化四苯硼钠与碘代苯在20min内即可定量反应，与常规加热方式相比，节省了大量时间；同时也证明了四苯硼钠的四个苯基均可参与Suzuki偶联反应；该催化剂回收再利用3次后，仍具有较高的催化活性。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。