A novel radioisotope method for studying catalytic transformations over alumina, H-ZSM-5 and H-beta zeolite catalysts: Investigation of conversion of 11C-labeled methanol to 11C-labeled dimethyl ether and hydrocarbons

E. Sarkadi-Pribóczki, N. Kumar, T. Salmi, Z. Kovácz, D. Yu Murzin*

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

20 Citations (Scopus)

Abstract

A novel radiochemical method for investigating the catalytic transformations of the 11C-radioisotope labeled methanol over H-ZSM-5 and H-Beta zeolite catalysts has been introduced. The catalysis process was monitored by gamma detectors and the 11C-labeled products were analyzed by radio-gas chromatography. The medium pore H-ZSM-5 and H-Beta zeolite catalysts were synthesized and characterized using X-ray powder diffraction, scanning electron microscope, nitrogen adsorption. X-ray fluorescency and FTIR spectroscopy. The investigations of 11C-labeled product distributions and reaction mechanism of the conversion of [11C]Jmethanol over H-ZSM-5 and H-Beta zeolite catalysts have been elaborated in terms of structure and acidity of the catalysts. In microreactors the effect of natural carbon compounds from environment can be a disturbing effect for the detection of inactive carbon products. Applied radio detection method eliminates these disturbing effects and detects only 11C-labeled compounds during the whole catalytic process. In the study of the transformations of carbon compounds, besides the well known 14C tracer technique and 13C MAS NMR spectroscopy investigation, the 11C-method is a new, more sensitive and simple one to monitor the transformation of the starting 11C-labeled compound by radio detectors (gamma detector) and for analyzing the 11C-labeled products by radio-gas chromatography.

Original languageEnglish
Pages (from-to)101-107
Number of pages7
JournalCatalysis Letters
Volume93
Issue number1-2
DOIs
Publication statusPublished - Mar 2004
MoE publication typeA1 Journal article-refereed

Keywords

  • C-labeled hydrocarbon
  • C-labeled methanol
  • Catalyst
  • Hydrocarbon
  • Methanol conversion
  • Zeolite

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