id	keyword
american_scientific_journal-4244	propylene
american_scientific_journal-4244	catofin
american_scientific_journal-4244	propane
american_scientific_journal-4244	pdh
american_scientific_journal-4244	catalyst
american_scientific_journal-4244	oleflex
american_scientific_journal-4244	technology
american_scientific_journal-4244	saudi
american_scientific_journal-4244	plants
american_scientific_journal-4244	process
american_scientific_journal-4244	arabia
american_scientific_journal-4244	reactor