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用 TPSR(程序升温表面反应 ) - TR(FT) IR技术 ,研究临氧条件下丙烷在负载型钒基催化剂上的活化和转化 ,并与催化剂的可还原性和表面酸性相关联 .丙烷氧化脱氢生成丙烯与深度氧化生成 COx的起始反应温度相同 ;而裂解产物 C2 H4和 CH4的生成温度比丙烷氧化脱氢生成丙烯的高得多 ,可能主要源于丙烷的高温气相裂解 .催化剂的表面酸性位和强的可还原性 ,有利于丙烷中 C- H键的活化和临氧转化 ,降低起始反应温度和提高丙烷转化率 .但强的可还原性也易导致氧化脱氢产物丙烯的进一步氧化 ,特别是酸性位对丙烯的吸附更易导致丙烯被进一步氧化
The activation and conversion of propane on supported vanadium-based catalysts under oxidative oxidative stress were investigated by TPSR-TR (FT) IR technique and correlated with the reducibility and surface acidity of the catalysts. The initial reaction temperature of hydrogen to propylene is the same as that of deep oxidation to form COx. The formation temperatures of C2H4 and CH4 are much higher than that of propane to propylene, which may be mainly due to high temperature gas phase pyrolysis of propane. Acidic sites and strong reducibility, which are propitious to the activation of C-H bond and oxygen conversion in propane, reducing the initial reaction temperature and increasing the propane conversion rate, but the strong reducibility also easily leads to the oxidative dehydrogenation product propylene Further oxidation, especially the adsorption of acidic sites on propylene, is more likely to lead to further oxidation of propylene