Development of catalytic processes for the conversion of propane to alpha,geta-unsaturated compounds

研究了将丙烷转化为α、β不饱和化合物的新催化工艺的发展。实验发现，在500℃的氧化温度下，丙烷在白钨矿结构的混合氧化物催化剂上有较好的选择性氧化成丙烯醛。虽然丙烷的转化率低于20%，但对丙烯醛的选择性可达60%。在氨存在下，丙烷与分子氧以15%的转化率和65%的选择性转化为丙烯腈。Bi_ < 0.85 > V_ < 0.55 > Mo_ < 0.45 > O_4, Bi_ < 0.85 > Nb_ < 0.55 > Mo_ < 0.45 > O_4, Bi_ < 0.85 > Ta_ < 0.55 > Mo_ < 0.45 > O_4,和Bi_3Fe_1Mo_2O_ < 12 >被认为是积极的反应。通过添加少量的银，这些白钨矿型氧化物的催化性能得到了改善。还发现，生成丙烯醛和丙烯腈的两个反应都包括一个自由基反应步骤，包括丙烷脱氢生成丙烯的自由基反应步骤，丙烯催化转化为α， β -不饱和化合物。这些结果给工业化学提供了许多有用的资料，工业化学目前正在认真研究对工业过程的反应的发展。

Development of new catalytic processes to covert propane to alpha,beta-unsaturated compounds has been investigated. It was found that propane was oxidized fairly selectively to acrolein on mixed oxide catalysts having scheelite structure at 500ﾟC. Although the conversion of propane was less than 20%, selectivity to acrolein reached to 60% of the converted propane. In the presence of ammonia, propane was converted to acrylonitrile with molecular oxygen at 15% conversion with 65% selectivity. Bi_<0.85>V_<0.55>Mo_<0.45>O_4, Bi_<0.85>Nb_<0.55>Mo_<0.45>O_4, Bi_<0.85>Ta_<0.55>Mo_<0.45>O_4, and Bi_3Fe_1Mo_2O_<12> were found to be active for the reactions. The catalytic performances of these scheelite type oxides were improved by the addition of small amounts of silver. It was also found that both reactions to produce acrolein and acrylonitrile include a radical include a radical reaction step to dehydrogenate propane to propylene which is converted to alpha,beta-unsaturated compounds catalytically. These results gave many useful informations to the industrial chemistry where development of the reaction to the industrial process is now seriously investigated.