C_4烯烃制丙烯催化剂  

Catalyst for C_4 alkenes to propylene conversion

作　　者：王定博[1] 郝雪松[1] 王斌[1] 满毅[1] 

机构地区：[1]中国石油化工股份有限公司北京化工研究院,北京100013

出　　处：《化工进展》2010年第10期1908-1912,共5页Chemical Industry and Engineering Progress

摘　　要：用超细氧化硅为载体、高硅铝比的ZSM-5分子筛为活性组分,挤条成型制成催化剂。用氧化钙和氧化硼的前体化合物改性,在580℃、常压、水质量空速为1h-1的条件下进行预处理24h,在500℃、0.1MPa、水/C4质量比为0.2、C4质量空速为3h-1的条件下,C4烯烃制丙烯和乙烯的反应产物组成稳定,在连续25天的反应过程中,C4烯烃转化率大于68%,丙烯收率大于30%,乙烯收率大于6%,催化剂的积炭量为6.2%。对成型、改性、水蒸气预处理和再生后的催化剂用BET、NH3-TPD和Py-IR进行表征,分析催化剂活性与酸性的关系,认为催化剂表面质子酸(B酸)与催化剂的活性有关。Using ultra-fine silicon oxide as carrier, ZSM-5 molecular sieves with high n（SiO2）/n（Al2O3） ratio were extruded yielding catalyst for catalytic cracking of C4 alkenes to propylene and ethylene. Precursors of calcium oxide and boron oxide were used to adjust the acidic property of the catalyst. The catalyst was pretreated with water vapor for 24 h at 580 ℃ under atmospheric pressure and water WHSV of 1 h-1. The catalyst was evaluated at 500℃ under 0.1MPa with w（H2O）：w（C4=）=0.2 and WHSV of 3 h-1, the continuous operation of 25 days proved the stability of catalyst;the conversion of C4 alkenes was higher than 68%, the yield of propylene and ethylene were higher than 30% and 6%, respectively, and the amount of carbon deposition on catalyst was 6.2%. The catalysts were characterized by BET, NH3-TPD and Py-IR, which illustrated that the catalytic activity is corelated with B acid in the catalyst.

关 键 词：C4烯烃 催化裂解 分子筛 催化剂 丙烯 

分 类 号：TQ426.94[化学工程]