摘要
采用环烷酸钒、NH_4VO_3和V_2O_5分别对分子筛进行污染,水热处理后,考察不同钒源对分子筛结构破坏的差异。结果表明:不同钒源对分子筛结构的影响存在差异,在相同钒含量条件下,经水热老化处理后,环烷酸钒对分子筛结构破坏最严重,NH_4VO_3次之,V_2O_5最弱;钒污染实验中,应始终采用同一种污染源和相同污染方法;水蒸气是钒破坏分子筛晶体结构的关键因素,经800℃水热处理后,钒与分子筛作用生成了莫来石晶相,没有检测到AlVO_4的特征衍射峰,在稀土存在的条件下,生成了REVO_4;V_2O_5以非化学计量的方式破坏分子筛的结构,在分子筛结构破坏过程中起到了类似催化剂的作用。
The contaminations of Y zeolite by vanadium from different sources were conducted using ammonium metavanadate, vanadyl-naphthenate and vanadium pentoxide, respectively. The contami- nented Y zeolites were then hydrothermally treated and investigated to see the destruction extent of treated Y zeolites. Results show that vanadium from different source has a different impact on Y zeolite structure. At the same vanadium content and hydrothermal treatment conditions, the destroyed extent of Y zeolites is. vanadyl-naphthenate〉ammonium metavanadate〉vanadium pentoxide. This illustrates that for vanadium contamination experiment, the V source and contaminating way must be exactly the same. The results also indicate that the hydrothermal treatment is the most important factor affecting Y zeolite crystlinity. After hydrothermal treatment at 800 ℃, the mullite crystal phase was observed, without the formation of AlVO4, and REVO4 is generated in the case of REY. The V2O5 destroys the Y zeolite structure in a non-stoichiometric manner.
出处
《石油炼制与化工》
CAS
CSCD
北大核心
2016年第11期20-24,共5页
Petroleum Processing and Petrochemicals
关键词
催化剂
污染
失活
Y型分子筛
钒
稀土
catalyst
contamination
deactivation
Y zeolite
vanadium
rare earth
作者简介
张海涛，硕士，高级工程师，主要从事催化裂化催化剂的研究工作。
通讯联系人：杜晓辉，E-mail：duxiaohui01@petrochina．com．cn。
