School of Chemistry and Chemical Engineering, Nanjing University, Key Laboratory of Mesoscopic Chemistry, Ministry of Education, Jiangsu Provincial Key Laboratory of Nanotechnology, Nanjing 210093, China; 2.Nanjing Linear Alkyl Benzene Plant, SINOPEC, Nanjing 210046, China
The effect of alkalineearth promoters on the catalytic properties of supported PtSn/γ-Al2O3 catalysts for longchain paraffin (C10~13) dehydrogenation has been studied by using infrared spectroscopy of adsorbed pyridine (Py-IR), thermalgravimetry (TG), H2 chemisorption and temperatureprogrammed reduction (TPR) combined with microreactor tests. The results show that addition of alkalineearth metal (Mg, Ca, Sr, Ba) to PtSn/γ-Al2O3 can improve its catalytic stability for paraffin dehydrogenation by decreasing the amount of coke formed on the catalysts and increasing the fraction of bare metallic Pt surface after carbon deposition.However, coaddition of alkalineearth metal with higher basicity, e.g. Ba2+, results in stronger interaction between Sn and support, leading to weaker interaction between Pt and Sn and decrease of bare fraction of Pt after carbon deposition. As a result, the PtSnBa/γ-Al2O3 catalyst shows a lower catalytic activity for longchain paraffin dehydrogenation.