论文部分内容阅读
采用ＸＲＤ，ＳＥＭ，ＢＥＴ以及轻油微反、小型固定流化床反应等方法，研究了钒对ＳＲＹ分子筛的结构和裂化活性的影响，以及稀土氧化物对钒破坏作用的抑制。结果表明，沉积在催化剂上的稀土氧化物可以优先与钒反应，生成钒酸稀土，从而保护了催化剂中分子筛的结构；分子筛晶内的稀土离子，同样容易与钒反应，也生成钒酸稀土，从而加剧了钒对分子筛结构的破坏。氧化铈较氧化镧更容易与钒反应，因而具有更强的抗钒能力。
The effects of vanadium on the structure and cracking activity of SRY zeolites and the inhibition of the destruction of vanadium by the rare earth oxides were studied by XRD, SEM, BET, micro-reaction of light oil and small fixed-bed reaction. The results show that the rare earth oxides deposited on the catalyst can preferentially react with vanadium to form rare earth vanadate to protect the structure of the molecular sieve in the catalyst. The rare earth ions in the molecular sieve can also easily react with vanadium and form rare earth vanadate, Thus exacerbating the vanadium damage to the molecular sieve structure. Cerium oxide is easier to react with vanadium than lanthanum oxide, so it has stronger anti-vanadium ability.