摘要
为研究焦化石脑油加氢装置催化剂床层的硅沉积规律及验证捕硅剂FHRS-2对主催化剂的保护作用,在实验室中试装置进行了2000 h焦化石脑油加氢运转试验,通过X射线荧光光谱、X射线衍射、X射线光电子能谱、N 2吸附-脱附等表征手段研究硅沉积对催化剂孔结构性质的影响,推测含硅物种在再生前后催化剂上的转化过程。结果表明:焦化石脑油加氢装置催化剂床层上硅的沉积量并非均匀递减,第一、第二床层沉积量都比较高;催化剂的比表面积随硅沉积量变化的敏感性高于孔体积及孔径;原料中的含硅物质环硅氧烷吸附在催化剂表面后,在催化剂床层的高温区发生反应,并在再生过程中生成SiO2沉积在催化剂孔道内;通过级配装填捕硅剂FHRS-2,可以有效保护主催化剂活性,延长焦化石脑油加氢装置运行周期。
In order to study the silica deposition rule on catalyst bed in coking naphtha hydrogenation unit and verify the protective effect of FHRS-2 silicon trap catalyst,a 2000 h simulated operation test was carried out.In addition,the influence of silica deposition on the pore properties of the catalyst was investigated by means of XRF,XRD,XPS,N 2 adsorption-desorption,and the conversion process of silicone-bearing species before and after catalyst regeneration was speculated.The experimental and analytical results showed that the deposition of silicon in the catalyst beds of coking naphtha hydrogenation unit did not decrease uniformly,and in the first and second bed the deposition amount was relatively high.The sensitivity of specific surface area of catalyst to silicon deposition was higher than that of pore volume and pore size.Based on the experimental results,it is speculated that the silicon-containing substance(cyclosiloxane)reacts on the catalyst surface in the high temperature region;and SiO2 is generated and deposited in the catalyst pore canal during the regeneration process.The activity of main catalyst in downstream can be effectively protected and the operation cycle of coking naphtha hydrogenation unit can be prolonged by loading silicon trap catalyst FHRS-2 in grading mode.
作者
代萌
丁贺
徐大海
李士才
李扬
张瀚
Dai Meng;Ding He;Xu Dahai;Li Shicai;Li Yang;Zhang Han(SINOPEC Dalian Research Institute of Petroleum and Petrochemicals,Dalian,Liaoning 116000)
出处
《石油炼制与化工》
CAS
CSCD
北大核心
2021年第2期51-56,共6页
Petroleum Processing and Petrochemicals
基金
国家十三五计划项目(YS2017YFGX010180)。
关键词
焦化石脑油
加氢精制
硅沉积
捕硅剂
coking naphtha
hydrogenation
silicon deposition
silicon trap catalyst
