摘要
以ZSM-5为母体分子筛,Bi Cl3为杂原子前驱体,利用气固相同晶取代法制备杂原子分子筛Bi-ZSM-5催化剂,并将其用于乙炔氢氯化反应。在同晶置换过程中,通过对取代过程中载气(N2)流量、取代温度及取代时间进行考察,确定了气固相同晶取代的最佳反应条件:取代温度为600℃,取代时间为24 h,载气流量为10 m L/min。所制备的催化剂催化乙炔氢氯化反应时,在相同的的空速条件下,催化剂的初始活性明显高于工业汞催化剂。通过对催化剂进行XRD、TG、IR等一系列表征表明,经过同晶取代后部分Bi进入了分子筛骨架,且催化剂失活的原因是由于催化剂表面产生积炭掩盖了催化剂的活性位。
Bi-ZSM-5 heteroatom zeolite catalyst is prepared by gas-solid isomorphous substitution for the catalysis of acetylene hydrochlorination with ZSM-5 as the parent zeolite and Bi Cl3 as the precursor. The effect of the isomorphous substitution temperature,time and carrier gas flow rate is studied. The optimal conditions are： 600℃ and 24 hours of isomorphous substitution temperature and time,respectively,10 m L / min of carrier gas flow rate. The catalytic performances of Bi-ZSM-5 for acetylene hydrochlorination is obviously higher than that of industrial mercuric chloride catalyst. The XRD,TG and FT-IR results suggest that the Bi is inserted in the framewok of ZSM-5 zoelite and coke deposition is the main reason for the catalysts deactivation.
出处
《现代化工》
CAS
CSCD
北大核心
2016年第5期90-93,共4页
Modern Chemical Industry
基金
新疆自治区自然科学基金(2015211C254)
关键词
气固相同晶取代
乙炔氢氯化
Bi-ZSM-5
失活
gas-solid isomorphous subsitution
acetylene hydrochlorination
Bi-ZSM-5
decativation
