摘要
研究了稀土元素Eu对Mo/HZSM-5催化剂催化甲烷芳构化反应的影响,发现适量的稀土元素Eu可提高催化剂的甲烷转化率及苯选择性,在1023K反应时,甲烷的转化率达19.3%,苯的选择性达97.5%,且铕的促进作用随硅铝比的增加而加强.失活催化剂经氢气吹扫后,其活性较初活性略有提高.积炭分析表明,铕加速了催化剂的积炭,且适量积炭对芳构化反应也具有促进作用.
Under nonoxidizing condition and different reaction temperatures and different space velocities, the conversion of methane aromatization over Eu modified Mo/HZSM5 catalyst was investigated. The results showed that appropriate quantity of Eu could considerably improve the activity of the catalyst and selectivity for benzene. The conversion of methane reached 193% and the selectivity for benzene was about 975% at 1023 K. The Mo/HZSM5(n(SiO2)/n(Al2O3)=25) catalyst showed better performance than Mo/HZSM5(n(SiO2)/n(Al2O3)=38) for methane aromatization. Deposited carbon on the catalyst was removed by hydrogen treatment at 1023 K, the catalyst being regenerated. Carbon accumulation on the catalyst was studied by means of TG method. It was demonstrated that Eu enhanced carbon deposition on the catalyst and appropriate quantity of deposited carbon improved the activity of the catalyst.
出处
《催化学报》
SCIE
CAS
CSCD
北大核心
1998年第3期234-247,共14页
基金
汕头大学李嘉诚基金
关键词
甲烷
芳烃化
苯
铕
钼
HZSM-5
分子筛
催化剂
Methane, Aromatization, Benzene, Europium, Molybdenum, HZSM5 zeolite