摘要
采用水热合成晶化法制备了纳米级Hβ分子筛,并用机械混捏法制备了纳米复合Hβ-Al2O3分子筛烷基化催化剂,采用TG,BET,NH3-TPD,Py-IR等技术对Hβ-Al2O3分子筛催化剂的失活原因进行了分析,考察了失活催化剂的空气再生条件,并研究了失活催化剂的烧炭再生动力学。结果表明:积炭堵塞催化剂微孔孔道和覆盖大部分中等强度的L酸中心是催化剂失活的主要原因;在失活催化剂5mL、再生时间6h情况下得到适宜再生条件为温度450℃,空气流量50mL/min;失活催化剂的烧炭过程可按温度不同分为两段,分别用不同的动力学方程描述。
The nano-Hβ molecular sieve was prepared by hydrothermal method,and the composite Hβ-Al2O3 alkylation catalysts were prepared by mechanical kneading.The causes of the Hβ-Al2O3 catalysts deactivation were investigated by means of TG,BET,NH3-TPD and Py-IR.The effect of regeneration conditions on the performance of the regenerated catalysts was examined,and the coke combustion kinetics of the deactivated catalyst was also investigated.The results show that the carbon deposition is the main reason of catalyst deactivation,which blocks up the micropores and covers quite a number of moderate intensity L acid center of the catalyst.The suitable regeneration conditions of the deactivated catalyst are：temperature 450 ℃,air flow 50 mL/min for the 5 mL catalyst tested.Two stages with different carbon removal rate can be seen during the regeneration process and can be described respectively in two kinetic equations.
出处
《石油炼制与化工》
CAS
CSCD
北大核心
2013年第10期71-76,共6页
Petroleum Processing and Petrochemicals
基金
河北省自然科学基金项目(B2010000036)
关键词
纳米
HΒ分子筛
氧化铝
烷基化
失活
再生
烧炭动力学
nauometer
Hβ molecular sieve
alumina
alkylation
deactivation
regeneration
coke combustion kinetics
