人工晶体学报2018，Vol.47Issue(1)：43-50,8.
ZrO2预处理方式对ZrO2/SAPO-34复合催化剂物化性质及MTO催化性能的影响
Effect of Various ZrO2Pretreatment Methods on the Physicochemical Properties and MTO Catalytic Performance of the ZrO2/SAPO-34 Composite Catalyst
摘要
Abstract
The ZrO2 /SAPO-34 composite catalysts were prepared via hydrothermal coating method, and effect of various ZrO2 pretreatment methods on the physicochemical properties and MTO catalytic performance of the composite catalyst was investigated in this paper.These obtained products were extensively characterized by XRD, FT-IR, SEM, NH3 -TPD and BET techniques to investigate their crystalline phase, skeletal structure, morphology, surface acidity and pore structure.The results indicated that various ZrO2 pretreatment methods posed significant impact on the physicochemical properties and MTO catalytic performance of ZrO2 /SAPO-34 composite catalyst.The composite catalyst prepared from zirconium precursor and ZrO2 impregnated with little continuous composite phase and low specific surface area exhibited inferior catalytic performances with short catalytic life of respectively 410 min and 530 min.The homogeneous continuous composite phase and hierarchical structure with total amount of acid of 0.344 mmol/g were obtained from ZrO2 calcined at 450 ℃(microporous specific surface area of 112.91 m2 · g-1 , mesoporous specific surface area of 176.02 m2 · g-1 , total specific surface area of 288.93 m2 · g-1 , the total pore volume of 0.19 cm3 · g-1 ), and the composite catalyst exhibited excellent catalytic performances, stability and reaction life with methanol conversion of 100%,light olefins selectivity of 90.54%, and catalytic lifetime of 1130 min under the conditions of atmospheric pressure, reaction temperature of 380 ℃, nitrogen flow rate of 20 mL· min-1 and feed speed of 2 h-1.Compared with the single SAPO-34 molecular sieve, the catalytic lifetime of the ZrO2 /SAPO-34 composite catalyst was extended by 768 min.关键词
ZrO2/SAPO-34/复合催化剂/ZrO2预处理/MTO反应/层级结构Key words
ZrO2/SAPO-34/composite catalyst/ZrO2pretreatment/MTO reaction/hierarchical structure分类
化学化工引用本文复制引用
王乐,李小涛,曹建新,刘飞..ZrO2预处理方式对ZrO2/SAPO-34复合催化剂物化性质及MTO催化性能的影响[J].人工晶体学报,2018,47(1):43-50,8.基金项目
国家自然科学基金(21666007) （21666007）
贵州省百层次创新型人才专项(黔科合平台人才[2016]5655) （黔科合平台人才[2016]5655）
贵州省重点科学技术基金(黔科合JZ字2014-2007) （黔科合JZ字2014-2007）
贵州省联合基金项目(黔科合LH字[2017]7260号) （黔科合LH字[2017]7260号）
