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利用纯烃重整反应,TPT(程序升温滴定)及氢溢出等实验方法,研究铂锡、铂铼及铂铱双金属重整催化剂中第二金属组元作用.在500℃、0.980MPa条件下,正庚烷、甲基环戊烷以及环戊二烯-正庚烷混合原料的连续反应表明,锡组元必须与铂共载,在邻近铂的情况下才能发挥其作用,即能调节其金属功能,在改善催化剂选择性的同时提高稳定性,而分载铂锡催化剂则与单铂催化剂性能一样.铼组元无论是共载或分载均能起到类似作用,既有使积炭前身物开环裂解作用,又能使其选择性加氢而被消除掉的作用。在高温下,铱组元与铼组元同样地能产生氢溢出,分载铱与共载铱性能类似,都具有较强的开环裂解作用,它能提高催化剂的稳定性;主要是通过破坏积炭前身物减少积炭生成.
The effects of pure metal reforming reaction, TPT (temperature programmed titration) and hydrogen spillover on the second metal component in platinum-bismuth, platinum-rhenium and platinum-iridium bimetallic reforming catalysts were studied. Under the conditions of 500 ℃ and 0.980MPa The continuous reaction of n-heptane, methylcyclopentane and cyclopentadiene-n-heptane starting materials shows that the tin component must be supported on platinum and can play its role in the immediate vicinity of platinum, ie it can be adjusted Metal function, while improving the selectivity of the catalyst to improve stability, while the sub-load platinum-tin catalyst performance with the single-platinum catalyst. Rhenium component either shared or sub-load can play a similar role, both to make carbon The former open-loop cleavage, but also to enable selective hydrogenation and elimination of the role. At high temperature, the iridium component and rhenium component can generate hydrogen spillover similarly. The split iridium is similar to the common iridium loading and has strong open-loop cracking effect, which can improve the stability of the catalyst; Pre-carbon deposition to reduce coke formation.