Effect of Ni Placement on the Competition between n‑Heptane Hydroisomerization and Hydrogenolysis

SHI Jiawei; ZHANG Congchao; QIAN Yutong; QI Ruobing; CHEN Sinuo; DU Yunfei; CAO Xuyang; MU Chao; WANG Shengping

doi:10.20176/j.cnki.nxdz.20260901

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Effect of Ni Placement on the Competition between n‑Heptane Hydroisomerization and Hydrogenolysis

更新时间：2026-09-04

- Effect of Ni Placement on the Competition between n‑Heptane Hydroisomerization and Hydrogenolysis
- Journal of Ningxia University (Natural Science Edition in Chinese and English) Pages: 1-13(2026)
- 作者机构：
  
  1.宁夏大学化学化工学院，宁夏银川 750021
  2.天津大学化工学院，天津 300072
  3.天津大学浙江研究院，浙江宁波 315201
- 作者简介：
- 基金信息：
- DOI：10.20176/j.cnki.nxdz.20260901
  CLC：
- Received：11 July 2026，
  
  Online First：04 September 2026，
- 稿件说明：
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史佳伟，张丛超，钱羽童，等.Ni落位对正庚烷加氢异构-氢解竞争的调控作用［J］.宁夏大学学报（自然科学版中英文），XXXX，XX（XX）：1-13.

SHI Jiawei，ZHANG Congchao，QIAN Yutong，et al.Ni Siting Regulates the Competition between n-Heptane Hydroisomerization and Hydrogenolysis［J］.Journal of Ningxia University （Natural Science Edition in Chinese and English），XXXX，XX（XX）：1-11.
史佳伟，张丛超，钱羽童，等.Ni落位对正庚烷加氢异构-氢解竞争的调控作用［J］.宁夏大学学报（自然科学版中英文），XXXX，XX（XX）：1-13. DOI： 10.20176/j.cnki.nxdz.20260901.

SHI Jiawei，ZHANG Congchao，QIAN Yutong，et al.Ni Siting Regulates the Competition between n-Heptane Hydroisomerization and Hydrogenolysis［J］.Journal of Ningxia University （Natural Science Edition in Chinese and English），XXXX，XX（XX）：1-11. DOI： 10.20176/j.cnki.nxdz.20260901.

摘要

以正庚烷（n-C

）为模型反应物，制备具有原子尺度与纳米尺度金属-酸亲近关系的两类Ni基双功能催化剂，即Ni-HZSM-22/Al

、Ni-Al

/HZSM-22，系统考察Ni落位方式对加氢异构-氢解竞争行为的影响。结果表明，Ni落位方式可同时调控Ni-载体相互作用、Ni物种的表面化学环境及可接触Ni位点分布。与Ni-HZSM-22/Al

相比，Ni-Al

/HZSM-22中Ni

Abstract

Using n-heptane （n-C

） as a model molecule， two types

of Ni-based bifunctional catalysts， namely Ni-HZSM-22/Al

and Ni-Al

/HZSM-22， featuring atomic- and nanoscale metal-acid proximity， respectively， were prepared to systematically investigate the effect of Ni placement on the competition between hydroisomerization and hydrogenolysis. The results show that Ni placement simultaneously regulates the Ni–support interaction， the surface chemical environment of Ni species， and the distribution of accessible Ni sites. Compared with those of Ni-HZSM-22/Al

， the Ni

-related Ni 2p

3/2

peaks of Ni-Al

/HZSM-22 shift markedly toward higher binding energies， indicating strong Ni-O-Al interactions between Ni and Al

. Meanwhile， the Al

-supported environment favors the maintenance of a relatively high proportion of accessible Ni sites at moderate-to-high Ni loadings. The n-C

hydroisomerization results show that the i-C

yields over both series of Ni-based bi-functional catalyst exhibits a volcano-type variation. At low Ni loadings， the reaction is limited by insufficient dehydrogenation/hydrogenation functionality of the Ni sites， whereas at high Ni loadings， enhanced Ni-mediated hydrogenolysis decreases the isomerization selectivity. Among the catalysts， 2.0Ni-Al

/HZSM-22 achieves the highest isomer yield of 57.19%. Moreover， the trend in isobutance （i-C

） formation over this catalyst is similar to that over the Pt reference catalyst， while its CH

yield is relatively low. These findings indicate that the Al

-supported Ni sites can effectively supress Ni-mediated C-C bond hydrogenolysis while maintaining the required dehydrogenation-hydrogenation functionality. The key to designing Ni-based bifunctional hydroisomerization catalysts is therefore to achieve an appropriate balance between the metal and acid functions while supp

ressing the hydrogenolysis activity of the Ni sites， rather than simply optimizing metal-acid proximity or metal loading.

关键词

Keywords

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