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Coconversion of n -Dodecane and 2-Methylthiophene in the Presence of Dual-Zeolite Cracking Catalysts Containing Different Amounts of Rare-Earth Elements
Petroleum Chemistry ( IF 1.3 ) Pub Date : 2020-08-29 , DOI: 10.1134/s0965544120080113
K. S. Plekhova , A. S. Yurtaeva , O. V. Potapenko , T. P. Sorokina , V. P. Doronin

Abstract

The effect of the rare-earth element (REE) content in dual-zeolite cracking catalysts on the conversion of n-dodecane and an n-dodecane–2-methylthiophene mixture (5000 ppm S) has been studied. The catalysts have been synthesized using zeolites Y and ZSM-5 modified with REEs and phosphorus, respectively, as the active component. It has been shown that the presence of REE oxides in zeolite Y (at a constant SiO2/Al2O3 ratio) affects the catalytic activity of cracking catalysts based on this zeolite. The dependence of the light olefin yield on the REE oxide content in zeolite Y passes through a maximum at 2–3 wt %. The presence of a sulfur compound in an amount of 5000 ppm (in terms of sulfur) in the feedstock leads to a decrease in the model hydrocarbon conversion and the C2–C4 olefin yield. In the presence of a sulfur compound, the change in the C2–C4 olefin yield as a function of REE oxide content in zeolite Y is less pronounced than that in the case of individual n-dodecane cracking.


中文翻译:

含有不同数量稀土元素的双沸石裂解催化剂存在下的正十二烷与2-甲基噻吩的共转化

摘要

研究了双沸石裂化催化剂中稀土元素(REE)含量对十二烷和十二烷-2-甲基噻吩混合物(5000 ppm S)转化的影响。使用分别用REE和磷改性的Y和ZSM-5沸石作为活性组分合成了催化剂。已经表明,沸石Y中存在REE氧化物(SiO 2 / Al 2 O 3恒定)比例)影响基于该沸石的裂化催化剂的催化活性。轻质烯烃产率对沸石Y中REE氧化物含量的依赖性最大达到2-3 wt%。原料中硫化合物的含量为5000 ppm(以硫计)导致模型烃转化率和C 2 -C 4烯烃产率降低。在存在硫化合物的情况下,与单独的十二烷裂解情况相比,沸石Y中C 2 -C 4烯烃产率随REE氧化物含量变化的变化不那么明显。
更新日期:2020-08-29
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