normal heptane reforming of promoted platinum composite catalysts: preparation, characterization and catalytic performance

Pt/zr(x)-hms/hzsm-5 catalysts with different ratios of silicium/zirconium (denoted as x) were studied for normal heptane reforming at 350-450 °c temperature range. for this purpose, the properties of the catalysts such as x-ray diffraction, x-ray fluorescence, fourier-transform infrared spectroscopy, ultraviolet–visible diffuse reflectance spectroscopy, nh3-temperature programmed desorption, h2 chemisorption, n2 adsorption-desorption, and thermal gravimetric analysis were used. the results show that the produced pt/zr(x)-hms/hzsm-5 catalysts have highly efficient performance for n-heptane reforming with a high isomers selectivity up to 69.4% (mono branched isomers = 31.8% and multi branched isomers = 37.6%) and a good selectivity to aromatic compounds (especially toluene = 6.9%), in spite of an appropriate selectivity to light products. it was revealed that the proper structure of these catalysts facilitates the reforming of n-heptane. according to these results, pt/zr(35)-hms/hzsm-5 catalyst showed the favorable properties for this investigated catalytic process.