In this work, low-cost and environmentally friendly catalysts Ti-doped ZnAl₂O₄ spinel were prepared by a homogeneous co-precipitation method and employed to catalyze propane dehydrogenation. In situ FTIR revealed that Ti accelerated the conversion of zinc propyl species (intermediate species) to propene, which is rate-determining step for propane dehydrogenation over active site coordinatively unsaturated Zn (Zn_cus). Characterizations, such as H₂-TPR, temperature programmed surface reaction (TPSR) and C₃H₆-TPD illustrated that Ti improved oxygen mobility resulting in the improved catalytic activity, and promoted desorption of propene leading to significant enhancements in propene selectivity and the stability of catalyst. Zn_1.5Ti₁Al₂ exhibited an excellent catalytic performance due to the existence of more Zn_cus, at 43% C₃H₈ conversion, a 84% of C₃H₆ selectivity was obtained at 500 ° C. The deactivation of Ti-doped ZnAl₂O₄ spinel is due to the formation of coke rather than the reduction of Zn species. This work provided an effective strategy to improve the catalytic activity of Zn-based catalysts for propane dehydrogenation.

在这项工作中，通过均相共沉淀法制备了低成本且环保的催化剂 Ti 掺杂的 ZnAl ₂ O ₄尖晶石，并用于催化丙烷脱氢。原位FTIR 显示 Ti 加速了锌丙基物种（中间物种）向丙烯的转化，这是丙烷在活性位点配位不饱和锌（Zn _cus）上脱氢的速率决定步骤。表征，例如 H ₂ -TPR、程序升温表面反应 (TPSR) 和 C ₃ H ₆-TPD表明Ti提高了氧的流动性，从而提高了催化活性，并促进了丙烯的解吸，从而显着提高了丙烯的选择性和催化剂的稳定性。Zn _1.5 Ti ₁ Al ₂由于存在较多的Zn _cus，表现出优异的催化性能，在43%的C ₃ H ₈转化率下，在500°C下获得了84%的C ₃ H ₆选择性。Ti-的失活掺杂ZnAl ₂ O ₄尖晶石是由于焦炭的形成而不是锌物种的减少。该工作为提高锌基催化剂对丙烷脱氢的催化活性提供了一种有效的策略。