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利用催化裂化平衡催化剂ＣＨＺ ２ 考察了稀土元素ＲＥ的钝镍性能。实验结果表明，适量的ＲＥ钝镍剂能明显降低催化裂化反应的比氢气量和比积炭值，提高汽油收率，具有较明显的钝镍效果。程序升温还原实验和ＸＲＤ物相检测发现，在ＦＣＣ 再生温度（ 约７００ ℃） 下，ＲＥ和沉积在催化剂表面上的高价镍反应生成ＲＥＮｉＯ３ 晶相。ＲＥＮｉＯ３ 中的镍在ＦＣＣ 反应温度（ 约５００ ℃）下不易被氢气还原，这就有效地封闭了镍，抑制了镍的脱氢生焦活性。ＮＨ３ － 程序升温还原测定表明，当ＲＥ与镍的原子比大于０ ．４ 时，催化剂表面上的中强酸和强酸总量降低，导致烃类裂化活性下降，当ＲＥ与镍的原子比为０ ．３～０ ．４ 时，钝镍效果最佳
The performance of rare earth element RE in blunting nickel was investigated using CHZ 2, a catalytic equilibrium catalyst. The experimental results show that the appropriate amount of RE blunter can significantly reduce the specific hydrogen content and specific carbon deposition of the catalytic cracking reaction and increase the yield of gasoline with obvious blunt nickel effect. The temperature-programmed reduction test and XRD phase analysis showed that RE reacted with high-valent nickel deposited on the catalyst surface at the FCC regeneration temperature (about 700 ℃) to form RENiO3 crystal phase. Nickel in RENiO3 is not easily reduced by hydrogen at the FCC reaction temperature (about 500 ° C), which effectively blocks the nickel and inhibits the de-coking activity of nickel. NH3 - temperature programmed reduction test showed that when the atomic ratio of RE to nickel is greater than zero. 4, the total amount of medium and strong acids on the catalyst surface decreased, resulting in a decrease in the hydrocarbon cracking activity when the atomic ratio of RE to nickel was zero. 3 ~ 0. 4, blunt nickel effect best