Abstract

Alkaline treated ZSM-5 zeolite was used in heavy oil upgrading process under atmospheric oxygen flow. Alkaline treatment was employed to induce mesopores in ZSM-5 catalyst structure to alleviate the mass transfer and reduce diffusion limitations. XRD, BET and XRF analyses were employed to investigate the effect of alkaline treatment. Effect of oxygen atmospheric flow, supplied by air stream, on heavy oil catalytic cracking process was investigated in a fixed bed reactor. Obtained liquids were analyzed by FTIR and GC/SIMDIS. Results revealed that percent of light oil (naphtha + kerosene) produced was nearly doubled in the presence of 5 wt% oxygen in the feed. Conversion of heavy oil (content with the BPT higher than 370 °C) was enhanced from 45.7% up to 58.1% by applying air stream. Viscosity reduction was elevated from 40% in nitrogen atmosphere to 53% in presence of 5 wt% oxygen content. Spent catalysts were characterized by TGA, XRD and BET analyses in order to determine coke deposition and catalyst structural stability. Oxidative cracking increased the amount of coke production over the catalyst, however, structural stability of the catalyst was not altered compared to conventional cracking process and crystalline structure of the catalyst was preserved after 5 h time on stream.

中文翻译：

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大气氧气流下中孔HZSM-5沸石对重油的催化提质

摘要

碱性处理的ZSM-5沸石在大气氧气流下用于重油改质过程。碱性处理用于在ZSM-5催化剂结构中诱导介孔，以减轻传质并减少扩散限制。XRD，BET和XRF分析用于研究碱处理的效果。在固定床反应器中研究了气流提供的氧气大气流量对重油催化裂化过程的影响。通过FTIR和GC / SIMDIS分析获得的液体。结果表明，在进料中存在5 wt％的氧气时，产生的轻油（石脑油+煤油）的百分比几乎翻倍。通过施加气流，重油的转化率（BPT含量高于370°C）从45.7％提高到58.1％。在氧含量为5重量％的情况下，粘度降低从氮气气氛中的40％增加至53％。通过TGA，XRD和BET分析对废催化剂进行表征，以确定焦炭沉积和催化剂结构稳定性。氧化裂化增加了催化剂上焦炭的生成量，但是，与常规裂化方法相比，催化剂的结构稳定性没有改变，并且在运行5小时后，催化剂的晶体结构得以保留。