丙酮醛

While the adsorptions of 1-propanol and 1-Br-propane at 100℃ give rise to 1-propoxy species, which mainly converted to propanal at higher temperature. IR spectrum arising from the interaction of propene with the catalyst at 100 ℃ shows the IR bands of allyl alcoholate and isopropoxy species. As the temperature was increased to 150℃, the bands ascribable to the adsorbed acetone and acrolein were observed. Based on these results, it is suggested that isopropoxy species is one of the intermediates for SOP to acrolein over MoPO/SiO〓 catalyst.

2原位IR光谱实验结果表明：200℃时丙烷/O〓混合气在催化剂表面吸附后的IR谱与同温度下异丙醇吸附的IR谱相似，均检测到吸附态丙酮物种和丙烯醛物种的IR谱峰；溴代异丙烷和异丙醇在催化剂表面吸附后均转化为异丙氧基，异丙氧基主要转化为丙烯和丙酮，丙烯进一步转化为丙烯醛；溴代正丙烷和正丙醇在催化剂表面吸附后均转化为正丙氧基，正丙氧基主要转化为丙醛；丙烯在催化剂表面吸附后转化为σ-氧烯丙基和异丙氧基，升温后σ-氧烯丙基转化为丙烯醛而异丙氧基转化为丙酮。

While the adsorptions of l-propanol and 1-Br-propane at 100 癈 give rise to 1-propoxy species, which mainly converted to propanal at higher temperature. IR spectrum arising from the interaction of propene with the catalyst at 100 癈 shows the IR bands of allyl alcoholate and isopropoxy species. As the temperature was increased to 150 癈, the bands ascribable to the adsorbed acetone and acrolein were observed. Based on these results, it is suggested that isopropoxy species is one of the intermediates for SOP to acrolein over MoPO/SiO2 catalyst.

原位IR光谱实验结果表明：200℃时丙烷／O_2混合气在催化剂表面吸附后的IR谱与同温度下异丙醇吸附的IR谱相似，均检测到吸附态丙酮物种和丙烯醛物种的IR谱峰；溴代异丙烷和异丙醇在催化剂表面吸附后均转化为异丙氧基，异丙氧基主要转化为丙烯和丙酮，丙烯进一步转化为丙烯醛；溴代正丙烷和正丙醇在催化剂表面吸附后均转化为正丙氧基，正丙氧基主要转化为丙醛；丙烯在催化剂表面吸附后转化为σ-氧烯丙基和异丙氧基，升温后σ-氧烯丙基转化为丙烯醛而异丙氧基转化为丙酮。

As an important organic intermediate, methylglyoxal is widely used in producing imidazole and furanone, and also has important applications in medicine, agricultural pesticide, textile and so on.

丙酮醛是一种重要的有机合成中间体，被广泛应用于生产药物中间体4-甲基咪唑和食品增香剂呋喃酮，并在医药、农药、纺织等领域也有很重要的应用。

So the catalysts for producing methylglyoxal from 1,2-propane glycol were studied in this thesis.

因此本文对丙二醇氧化制备丙酮醛的催化剂进行了研究。

The technology of producing methylglyoxal in our country was developed in recent years, but its capacity is small, and the catalyst is very expensive too.

国内丙酮醛的生产起步晚，规模较小，并且所需催化剂比较昂贵。

The ozonolysis of isoprene has a significant contribution to atmospheric carbonyls, especially to formaldehyde and methylglyoxal.

异戊二烯臭氧氧化反应对大气羰基化合物特别是甲醛和丙酮醛具有重要贡献。

Firstly, the molybdenum based catalysts modified by silver, phosphorus, vanadium using aluminum oxide as carrier were studied. The results showed that its catalytic performance for 1,2-propane glycol oxidation to methylglyoxal is good.

论文首先对以氧化铝为载体，在银、磷、钒修饰下的钼系催化剂进行了研究，通过实验发现该催化剂对丙二醇氧化制备丙酮醛具有高的催化活性和较好的选择性。

Using the chemical reaction route selection method proposed by the authors, a reaction route of using commercial methylglyoxal as the starting material to produce Furaneol was chosen.

今采用作者提出的化学反应路径选择因子对呋喃酮的合成方法进行计算比较，确定了以丙酮醛为原料，通过偶联反应合成中间体苏式3，4-二羟基-2，5-己二酮，再由成环反应制备产物呋喃酮的合成路线。

Modified synthesis of furanone from pyruvaldehyde by microwave irradiation was studied.

以丙酮醛为原料采用微波法环化合成呋喃酮。

Dimethyl - 4 - hydroxy - 3(2H) furanone has been synthesized by the hydrogenatic coupling of pyruvaldehyde and cyclization under the basis conditions.

以丙酮醛为原料，在乙酸水溶液中用锌粉氢化二聚，然后在碱性溶液中闭环，合成了一种重要的杂环香料呋喃酮，产率达 2 8.6 %。

Now, however, all children continue in "comprehensive" schools, and the eleven-plus determines which courses of study the child will follow.

然而现在，所有的孩子都要在综合学校继续学习，所以这次考试只是决定他们将要学习哪些课程。

Cultivatable land , and led to a general recognition that development must not be carried at the cost of agriculture .

城区的迅速扩大在很多情况下侵占了宝贵的可耕地，使人们普遍认识到发展不能以牺牲农业为代价。