摘要
针对催化裂化重油转化过程中焦炭产率高的问题,开展了催化裂化催化剂氧化铝的改性研究以提升重油转化率并抑制焦炭生成。分别通过硼酸和磷酸氢二铵对拟薄水铝石进行了浸渍改性,制备了改性氧化铝Al_(2)O_(3)-B和Al_(2)O_(3)-P。通过X射线衍射(XRD)、N_(2)吸-脱附、NH_(3)-程序升温脱附(NH_(3)-TPD)和吡啶-红外(Py-IR)等技术手段对样品的晶体结构、内部孔隙结构、酸量和酸强度进行了表征。结果显示,与未改性的Al_(2)O_(3)-0相比,Al_(2)O_(3)-B、Al_(2)O_(3)-P孔体积和比表面积下降,最可几孔径变小,但其热稳定性提高,经950℃焙烧后样品的比表面积保留率提高了15%以上;改性后Al_(2)O_(3)-B的酸量增加,Al_(2)O_(3)-P的酸量略微降低,但Al_(2)O_(3)-B和Al_(2)O_(3)-P的弱酸及L酸强度均降低。对采用Al_(2)O_(3)-0、Al_(2)O_(3)-B、Al_(2)O_(3)-P分别制备的催化裂化催化剂进行了反应性能评价。结果显示,与CAT-1相比,CAT-2重油产率降低0.92%,焦炭产率降低0.55%,总液收增加1.46%;与CAT-1相比,CAT-3重油产率增加0.32%,焦炭产率降低0.78%,总液收增加0.48%。相对于CAT-1,CAT-2和CAT-3具有重油转化能力强,焦炭产率低的特点。对比Al_(2)O_(3)-P,Al_(2)O_(3)-B对应催化剂具有更高的总液收。
A study was conducted on the modification of alumina oxide to meet the requirements of catalytic cracking heavy oil conversion and reducing coke yield.Al_(2)O_(3)-B and Al_(2)O_(3)-P were obtained by impregnation modification of pseudo boehmite with boric acid and diammonium hydrogen phosphate.The crystal structure,pore structure,acid amount,and acid strength of the samples were characterized using techniques such as X-ray diffraction(XRD),N_(2) adsorption-desorption,NH_(3)-temperature-programmed desorption(NH_(3)-TPD),and pyridine-infrared spectroscopy(Py-IR).The results showed that compared with unmodified Al_(2)O_(3)-0,although Al_(2)O_(3)-B and Al_(2)O_(3)-P exhibited reduced pore volume,specific surface area,and smaller most probable pore size,their thermal stability was improved.After calcination at 950℃,the specific surface area retention rate was increased by more than 15%.The acid amount was increased for Al_(2)O_(3)-B but decreased for Al_(2)O_(3)-P,while the acid strength of both Al_(2)O_(3)-B andAl_(2)O_(3)-P were decreased.The catalytic performance of fluid catalytic cracking(FCC)catalysts prepared using Al_(2)O_(3)-0,Al_(2)O_(3)-B,and Al_(2)O_(3)-P was evaluated.Compared with CAT-1,CAT-2 showed a 0.92%decrease in heavy oil yield,a 0.55% reduction in coke yield,and a 1.46% increase in total liquid yield.In contrast,CAT-3 exhibited a 0.32% increase in heavy oil yield,a 0.78% decrease in coke yield,and a 0.48% rise in total liquid yield compared to CAT-1.Compared with CAT-1,CAT-2 and CAT-3 demonstrated stronger heavy oil conversion ability and lower coke yield.Furthermore,the Al_(2)O_(3)-B-based catalyst provided a higher total liquid yield than the Al_(2)O_(3)-P.
作者
熊晓云
穆林波
杜学敏
胡清勋
XIONG Xiaoyun;MU Linbo;DU Xuemin;HU Qingxun(Lanzhou Petrochemical Research Center,Petrochemical Research Institute,PetroChina,Lanzhou 730060,China;PetroChina Lanzhou Petrochemical Company,Lanzhou 730060,China;PetroChina Qingyang Petrochemical Company,Qinyang 745002,China)
出处
《无机盐工业》
北大核心
2025年第8期117-122,共6页
Inorganic Chemicals Industry
基金
中国石油基础研究专项(2023ZZ36)。
关键词
氧化铝
硼改性
磷改性
催化裂化
焦炭
aluminum oxide
boron modification
phosphorus modification
catalytic cracking
coke
