考察了前驱体制备过程中水合肼/五氧化二钒摩尔比(以下简记为n(N2H4)/n(V2O5))对催化剂性能的影响. 由较高的n(N2H4)/n(V2O5)比制得的催化剂,其(VO)2P2O7相含量较多,正丁烷转化率较高. 随着n(N2H4)/n(V2O5)比的减小,δ-VOPO4相的含量逐渐增多,正丁烷转化率随之升高; 而顺酐选择性开始时升高,达到最大值后逐渐降低. 在n(N2H4)/n(V2O5)=0.34时制备的催化剂最佳,在丁烷浓度为4.0%、空速为500 h-1及反应温度为420℃的反应条件下,顺酐收率可达49.74%. 本文中细粒床催化剂有较大的操作弹性.
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