摘要
以Cr/Al_2O_3为催化剂催化混合丁烷脱氢,采用SEM技术对催化剂进行表征,考察了反应温度和液时空速对混合丁烷脱氢性能的影响,并分析了正丁烷脱氢反应的产物分布。表征结果显示,Cr/Al_2O_3具有较好的球形形态,粒径36~135μm。实验结果表明,Cr/Al_2O_3对混合丁烷脱氢具有较高的催化活性,在反应温度540℃、液时空速2.5 h^(-1)时,100%(w)正丁烷的转化率达30%以上,正丁烯选择性接近80%;在反应温度540℃、液时空速2.5 h^(-1)时,混合丁烷中正丁烷含量(w)为40%~100%时的转化率达30%以上,丁烯选择性达90%以上;在反应温度540~560℃、液时空速2.0~2.5 h^(-1)时,混合丁烷中正丁烷含量低于40%(w)时的转化率为33%~45%,丁烯选择性达90%以上。正丁烷脱氢反应产物中反丁烯的选择性最高,顺丁烯次之,1-丁烯最低。
The dehydrogenation of mixed butanes over the Cr/A1203 catalyst was studied. The effects of reaction temperature and liquid hourly space velocity（LHSV） on the dehydrogenation were investigated and the product distribution was analyzed. The result indicated that Cr/A1203 had good spherical morphology, particle size is 36-135 μm. The results showed that the Cr/Al2O3 catalyst had high catalytic activity in the dehydrogenation. When the feedstock was 100%（w） n-butane, under the optimal conditions of reaction temperature 540 % and LHSV 2.5 h1, the conversion of n-butane was more than 30% and the selectivity to n-butene was close to 80%. When the n-butane content in the mixed butanes was in the range of 40%（w）-100%（w）, under the optimal conditions of reaction temperature 540 ℃ and LHSV 2.5 h1, the conversion of the mixed butane was more than 30% and the selectivity to butene was more than 90%. When the n-butane content was below 40%（w）, under the optimal conditions of reaction temperature 540-560 ℃ and LHSV 2.0-2.5 hl, the conversion of the mixed butane was 30%-45% and the selectivity to butene was above 90%. In the n-butane dehydrogenation, the selectivity to trans-butene was the maximum, the selectivity to cis-butene was the second and the selectivity to 1-butene was the minimum.
出处
《石油化工》
CAS
CSCD
北大核心
2015年第12期1461-1466,共6页
Petrochemical Technology
基金
山东省自然科学基金项目(ZR2013BM008)
关键词
铬/氧化铝催化剂
混合丁烷
脱氢
丁烯
chromium/aluminum oxide catalyst
mixed butanes
dehydrogenation
butene
