The effects of Si-additive modification on nonoxidative propane dehydrogenation (PDH) over γ-Al₂O₃ sheet-supported isolate Co²⁺ catalysts have been investigated. Si addition cannot change the nanosheet structure and tetrahedral Co²⁺ coordination of the Co catalysts; nonetheless, it introduces a number of moderate-strength acid sites by the formation of composite SiAl oxides. Promoted catalytic stability is achieved on Si-modified Si–Co–Al₂O₃ in comparison with the Si-free Co–Al₂O₃ catalyst. In spite of similar total content and H/C ratios of deposited coke species on these two spent catalysts, a relatively lower graphitization degree and a higher ratio of highly reactive coke species are observed on the Si–Co–Al₂O₃ catalyst. Furthermore, the co-feeding of C₃H₆ significantly changes the coking reaction rates but not the coke distributions on Co-based catalysts. The C₃H₆ temperature-programmed desorption profiles and in situ diffuse reflectance infrared Fourier transform spectra suggest that the interaction of C₃H₆ with Co catalysts can be affected by Si modification tuning the coking property and the catalytic stability of Co²⁺–Al₂O₃-based catalysts for the PDH reactions.

的Si-添加剂修饰对非氧化丙烷脱氢作用（PDH）超过γ -Al ₂ ö ₃片支持分离钴²⁺的催化剂进行了研究。Si的添加不能改变Co催化剂的纳米片结构和四面体Co ²⁺配位。但是，它通过形成复合SiAl氧化物而引入了许多中等强度的酸位。促进催化稳定性在Si改性的Si-Co-Al系实现₂ ö ₃中与Si -自由Co-Al系比较₂ ö ₃催化剂。尽管在这两种废催化剂上沉积的焦炭种类的总含量和H / C比值相似，但在Si–Co–Al ₂ O ₃催化剂上观察到相对较低的石墨化度和较高的高反应性焦炭比值。此外，C ₃ H ₆的共同进料显着改变了焦化反应速率，但没有改变基于钴的催化剂上的焦炭分布。C ₃ H _6程序升温程序解吸曲线和原位漫反射红外傅里叶变换光谱表明，C ₃ H ₆的相互作用Si改性会影响使用Co催化剂的催化剂的焦化性能和基于Co ²⁺ -Al ₂ O ₃的PDH反应催化剂的催化稳定性。