Hydrotreatment performance of NiAl-LDH catalyst for tar model compounds

LEI Haifeng; FAN Lei; WANG Mingyi; DONG Zihao; GUO Xiangyang; WANG Junwen

doi:10.12434/j.issn.2097-2547.20250034

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Hydrotreatment performance of NiAl-LDH catalyst for tar model compounds

更新时间：2025-08-25

- Hydrotreatment performance of NiAl-LDH catalyst for tar model compounds
- Vol. 50, Issue 8, Pages: 26-33(2025)
- 作者机构：
  
  1.太原理工大学化学与化工学院，山西太原 030024
  2.陕西未来清洁化学品有限公司，陕西榆林 719000
- 作者简介：
- 基金信息：
- DOI：10.12434/j.issn.2097-2547.20250034
  CLC： TQ523
- Received：21 January 2025，
  
  Revised：24 February 2025，
  
  Published：25 August 2025
- 稿件说明：
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雷海凤,樊磊,王明义等.NiAl-LDH催化焦油模型化合物加氢转化性能[J].低碳化学与化工,2025,50(8):26-33.

LEI Haifeng,FAN Lei,WANG Mingyi,et al.Hydrotreatment performance of NiAl-LDH catalyst for tar model compounds[J].Low-Carbon Chemistry and Chemical Engineering,2025,50(8):26-33.
雷海凤,樊磊,王明义等.NiAl-LDH催化焦油模型化合物加氢转化性能[J].低碳化学与化工,2025,50(8):26-33. DOI： 10.12434/j.issn.2097-2547.20250034.

LEI Haifeng,FAN Lei,WANG Mingyi,et al.Hydrotreatment performance of NiAl-LDH catalyst for tar model compounds[J].Low-Carbon Chemistry and Chemical Engineering,2025,50(8):26-33. DOI： 10.12434/j.issn.2097-2547.20250034.

摘要

在焦油提质过程中，实现焦油裂解与富氢气体转化的协同调控是提升催化剂性能的关键。为此，采用水热法制备了具有类水滑石层状结构的Ni基催化剂（NiAl-LDH），并引入Co以优化其性能。依托类水滑石的层间限域效应，实现了焦油催化转化活性位点与富氢气体活化位点的空间分离，将Ni均匀分布于主体层板上。由于分子尺寸较大的焦油模型化合物（如芘和荧蒽）难以进入层间结构，其裂解反应主要发生在催化剂表面，而小分子气体既可进入层间，也能在催化剂表面被充分活化。结果表明，Co的引入有效促进了Ni的分散并提高了其还原性能，其中

(Ni)/

(Co) = 5时催化剂表现出最优催化效果。在500  ℃下，Ni

2.5

0.5

Al-LDH催化剂对芘的加氢催化转化率为48.03%，轻质芳烃（BTX）选择性达55.63%。此外，荧蒽中C—C键更易断裂，其转化率和BTX选择性均高于芘。位于主体层板上的Ni能够活化H

生成·H自由基，进而稳定焦油裂解碎片，从而提高BTX选择性。本研究可为焦油提质催化剂的设计提供新的思路。

Abstract

In the process of tar upgrading

achieving synergistic regulation of tar cracking and hydrogen-rich gas conversion is key to improving catalyst performance. To this end

Ni-based catalysts with a layered hydrotalcite-like structure (NiAl-LDH) were prepared using a hydrothermal method

and Co was introduced to optimize their performance. Relying on the interlayer confinement effect of the hydrotalcite-like structure

the spatial separation of active sites for tar catalytic conversion and hydrogen-rich gas activation was realized

enabling uniform distribution of Ni on the main layer plate. Due to the large molecular size of tar model compounds (such as pyrene and fluoranthene)

they are unable to enter the interlayer structure

and thus their cracking mainly occurs on the catalyst surface. In contrast

small gas molecules can enter the interlayer and be effectively activated on the catalyst surface. The results show that the introduction of Co significantly promotes the dispersion and improve reduction performance of Ni

with the optimal catalytic performance achieved when

(Ni)/

(Co) = 5. Under reaction conditions of 500  ℃

the Ni

2.5

0.5

Al-LDH catalyst achieves a pyrene hydrogenation catalytic conversion rate of 48.03%

with a light aromatic hydrocarbon (BTX) selectivity of 55.63%. In addition

due to the easier cleavage of C—C bonds in fluoranthene

its conversion rate and BTX selectivity are higher than those of pyrene. The Ni located on the main layer plate can activate H

to generate ·H radicals

which help stabilize the tar cracking fragments

thereby enhancing BTX selectivity in the products. This study can pro

vide new insights into for design of tar upgrading catalysts.

关键词

Keywords

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