英语语法分析

The result shows that for catalyst CT-4A acrolein is a middle product and acrylonitrile, acetonitrile, carbon dioxide and carbon monoxide could be treated as parallel products.

实验结果表明，在CT-4A催化剂上，丙烯醛为反应过程的中间产物，丙烯腈、乙腈、一氧化碳、二氧化碳等均为丙烯氨氧化的平行产物；

The poor acrolein selectivity of this catalyst was improved by continuous use in the catalytic oxidation for making the particle size of the dispersed bismuth molybdate larger.

我们还发现，在催化氧化环境中连续使用的钼酸铋粒径会越来越长，对丙烯醛的选择性会相应提高。

However, due to the chemical stability of propane and the activity of acrolein, this reaction required a multiple functional catalyst and no great progress was made in this field.

但由于丙烷的稳定性和丙烯醛的活泼性，该反应对催化剂的要求苛刻，有关的研究并未取得重大的突破。