Hydroconversion of n-hexane over Pt-supported on fibrous silica mordenite catalysts: effect of transition metals on acidity and activity

Autor:	M. Ibrahim, W. F. W. Zakaria, M. Izan, Aishah Abdul Jalil, I. Hussain, A. A. Fauzi
Rok vydání:	2020
Předmět:	chemistry.chemical_compound Chemistry Hexene Hydrogenolysis Lewis acids and bases Brønsted–Lowry acid–base theory Bimetallic strip Isomerization Mordenite Nuclear chemistry Catalysis
Zdroj:	IOP Conference Series: Materials Science and Engineering. 808:012007
ISSN:	1757-899X 1757-8981
DOI:	10.1088/1757-899x/808/1/012007
Popis:	The effect of incorporation of either Zr, Co, Mo or Zn on Pt/HFSM was investigated for the hydroconversion of n-hexane in a pulsed micro-reactor at a temperature range 423-623 K. The acidity of all the studied catalysts were investigated using pyridine adsorption and Fourier Transform Infrared Spectroscopy. The FTIR-pyridine study showed that the catalysts possessed different concentration and strength of both Lewis and Brønsted acid sites. It was revealed that the moderate acid sites distribution on PtZr/HFSM and PtZn/HFSM facilitated the isomerization of the intermediate hexene while the strong acid sites were selective towards cracking reaction. The trend for the bimetallic catalysts studied in n-hexane hydroisomerization is in the order: PtZr/HFSM>PtZn/HFSM>PtMo/HFSM>PtCo/HFSM. The highest activity for hydrocracking and hydrogenolysis were exhibited by PtMo/HFSM and PtCo/HFSM respectively. The PtZr/HFSM exhibited the highest hydroisomerization activity due to the moderate acidity and abundant Lewis acid sites capable of generating protonic acid sites by the hydrogen-spill over phenomena.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::3dc785dd6a1d11ed36f04d5c9fde93dc https://doi.org/10.1088/1757-899x/808/1/012007 Zobrazit plný text záznamu