The catalytic stability of some selected bifunctional nanoporous-based catalysts in the hydroisomerisation of n-C7 and the effect of post-synthesis modification techniques

Research output: Contribution to journalArticle

  • External authors:
  • Faisal M Alotaibi
  • Raed H Abudawood
  • Hamid A Al-Megren
  • Mohammed C Al-Kinany
  • Essam H Jamea


In this work, some com. and inhouse nanoporous-based catalysts, such as USY, beta and mordenite zeolites, and mesoporous aluminosilicate mol. sieves such as MCM-48 and SBA-15, loaded with metals and acting as mono- and bimetallic bifunctional catalysts, were used for hydroisomerisation expts. in a fixed-bed reactor at pressures between 1 and 15 bar and at feed space time ranging from 2.57 to 10.26 h-1 (35.14-140.6 kg s mol-1) to hydroisomerise n-heptane over a temp. range of 210-270 °C. The effect of post-synthesis treatments of micro- and mesoporous catalysts was examd., regarding their activity, selectivity and stability, such as acid and steam dealumination techniques, acid leaching via a chelating agent, bimetal loading techniques, different platinum loading methods, and composite or hybrid catalyst generation. Results show that pore architecture is the most important factor affecting coke formation and deactivation in zeolite catalysts. It was found that those catalysts with high Si/Al ratios and those which had been acid-leached or steamed showed better activity, higher selectivity towards isomeric products and better time stability. Moreover, the balance between the no. of metal sites and the no. of acid sites played an important role in detg. the activity, selectivity and stability of the bifunctional catalysts. Higher metal loading improves catalytic stability, due to a better balance and closeness of the catalytic functions. Moreover, the bimetallic catalyst improves the formation of smaller metal particles and better dispersion, which may affect selectivity and stability. [on SciFinder(R)]

Bibliographical metadata

Original languageEnglish
Pages (from-to)95-136
Number of pages42
JournalApplied Petrochemical Research
Issue number1
Publication statusPublished - 2014

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