Mo supported on natural rectorite catalyst for slurry-phase hydrocracking of vacuum residue: An effect of calcination
Mo supported on natural rectorite catalyst for slurry-phase hydrocracking of vacuum residue: An effect of calcination
复制标题
天然累托石负载钼催化剂用于减压渣油浆相加氢裂化：煅烧的影响
DOI：
10.1016/j.petsci.2021.09.019
复制
发表时间：
2021-12-15
影响因子：
5.6
通讯作者：
Bao, Xiao-Jun
中科院分区：
文献类型：
--
作者：
Cui, Qing-Yan;Zhang, Hao-Bin;Bao, Xiao-Jun
为了开发用于减压渣油（VR）浆态床加氢裂化的高效低成本催化剂，制备了负载在天然累托石上的催化剂，并研究了累托石的煅烧改性对催化剂性能的影响。通过XRD、FTIR、Py - FTIR、H₂ - TPR和XPS对累托石载体和催化剂进行了表征，以考察其结构和性能。对比反应结果表明，负载在煅烧累托石上的催化剂的减压渣油转化率与负载在未煅烧累托石上的相似，这可能是由于在催化剂表面观察到的酸位点较少，减压渣油裂化反应遵循自由基机理受热裂化控制。然而，不同催化剂的石脑油和中间馏分油收率明显不同，且按照Rec - Mo（40.4 wt%）< Rec - 600 - Mo（52.7 wt%）< Rec - 450 - Mo（53.5 wt%）< Rec - 500 - Mo（61.7 wt%）的顺序增加，这表明累托石的煅烧有利于提高浆态床加氢裂化过程中催化剂的石脑油和中间馏分油收率，这归因于催化剂表面氧化钼物种的硫化程度较高促进了加氢反应，从而抑制了中间产物过度裂化生成气体的反应。（c）2021作者。由爱思唯尔出版服务公司代表科爱传播有限公司出版。这是一篇在CC BY - NC - ND许可（http://creativecommons.org/licenses/by - nc - nd/4.0/）下的开放获取文章。
In order to develop high-efficiency and low-cost catalyst for the slurry-phase hydrocracking of vacuum residue (VR), the catalyst supported on natural rectorite was prepared, and the effect of calcination modification of rectorite on the catalyst properties and performance was investigated. The support of rectorite and catalyst were characterized by XRD, FTIR, Py-FTIR, H2-TPR and XPS to examine their structures and properties. The comparative reaction results show that VR conversions for the catalysts supported on calcined rectorite were similar with that on raw rectorite, possibly due to the VR cracking reaction controlled by the thermal cracking following free radical mechanism because of few acid sites observed on the catalysts surface. However, the yields of naphtha and middle distillates for the various catalysts were obviously different, and increased following as Rec-Mo (40.4 wt%) < Rec-600-Mo (52.7 wt %) < Rec-450-Mo (53.5 wt%) < Rec-500-Mo (61.7 wt%), indicating that the calcination of rectorite favored the enhancement of the yields of naphtha and middle distillates for the catalyst in the slurry-phase hydrocracking process, it is attributed that the higher sulfidation degree of molybdenum oxide species on the catalyst surface promoted hydrogenation reaction, thus restrained over-cracking reaction of intermediate product to produce gas. (c) 2021 The Authors. Publishing services by Elsevier B.V. on behalf of KeAi Communications Co. Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/ 4.0/).