Carbon-doped alumina (CDA) beads with different carbon contents were prepared by an ammonium alginate (ALG) assisted sol–gel method via changing the concentration of ALG in preparation process, which were used as the support of Pt–Sn–K catalysts. XRF, XRD, BET, TEM, EDS, NH₃-TPD, TG and Raman techniques were employed to characterize the physical–chemical properties of CDA materials and Pt–Sn–K catalysts. Results showed that the as-prepared CDA materials all contained carbon and the carbon content was positively correlated with the concentration of ALG used in preparation process. The addition of carbon improved obviously the activity and stability of catalysts in propane dehydrogenation reaction due to larger specific surface (> 320 m²/g), more weak and moderate acid sites and strong resistance to carbon deposition. The PtSnK/CDA-1.5 with the optimal carbon content of 2.6 wt% exhibited the best activity and stability, for which the propane conversion was just declined from 36.4 to 28.7% and the propene selectivity remained above 96.7% even after the reaction for 106 h.

通过改变制备过程中ALG的浓度，通过藻酸铵（ALG）辅助溶胶-凝胶法制备了具有不同碳含量的碳掺杂氧化铝（CDA）珠，这些珠用作Pt-Sn-K催化剂的载体。XRF，XRD，BET，TEM，EDS，NH ₃ -TPD，TG和拉曼技术被用来表征CDA材料和Pt-Sn-K催化剂的物理化学性质。结果表明，所制备的CDA材料均含有碳，且碳含量与制备过程中所用ALG的浓度呈正相关。由于更大的比表面积（> 320 m ^2），碳的加入明显改善了丙烷脱氢反应中催化剂的活性和稳定性。/ g），更弱和中等的酸位以及对碳沉积的强抵抗力。最佳碳含量为2.6 wt％的PtSnK / CDA-1.5表现出最佳的活性和稳定性，即使反应106 h，丙烷的转化率也从36.4降至28.7％，丙烯的选择性仍保持在96.7％以上。 。