用于低温浆态床二甲醚水蒸气重整制氢的水解组分γ-Ga_2O_3的制备与表征  

Preparation and characterization of hydrolysis component γ-Ga_2O_3 for hydrogen production bylow temperature steam reforming of dimethyl ether in slurry reactor

作　　者：王东升[1] 张素玲[1] 魏磊 卢艳红[1] 景学敏[1] WANG Dong-sheng , ZHANG Su-ling, WEI Lei, LU Yan-hong, JING Xue-min(Department of Chemistry and Material Science, Lanjang Normal University, Lanjang 065000, Chin)

机构地区：[1]廊坊师范学院化学与材料科学学院,河北廊坊065000

出　　处：《燃料化学学报》2018年第6期666-672,共7页Journal of Fuel Chemistry and Technology

基　　金：河北省科技计划项目(13214606);国家自然科学基金(51502125);廊坊师范学院科学研究项目(LSZB201007)资助~~

摘　　要：以有机溶剂均匀沉淀法制备了镓的氧化物,借助XRD、NH_3-TPD、TEM和BET等手段对物相结构、表面性质等进行了表征。结果表明,制备过程中得到的前驱体为GaOOH,前驱体经500℃热处理后得到γ-Ga_2O_3。γ-Ga_2O_3的晶格类型与γ-Al_2O_3相似,为有阳离子缺陷的立方尖晶石结构。表面具有酸量较大的中强酸中心,而弱酸中心含量相对较少。微观上大多为厚10 nm、直径100 nm左右的二维纳米片,大部分纳米片分布于一个方向,一些组成花瓣形。将制得的γ-Ga_2O_3用于DME水解反应,结果表明,270℃下DME的转化率可达24%,接近平衡转化率,反应后催化剂的织构性质没有显著变化,比表面积仍可达到130 m2/g。将γ-Ga_2O_3与Cu基催化剂复合后用于270℃下的低温浆态床DME水蒸气重整反应,DME转化率和H_2选择性高达99%和68%,经200 h反应后催化剂仍能保持95%以上的活性,表现出良好的工业化应用前景。The oxide of gallium was prepared by homogeneous precipitation in organic solvent. The physical structure and surface properties were characterized by XRD,NH3-TPD,TEMand BET. The results reveal that γ-Ga2O3 was obtained after 500 ℃ heat treatment of the precursor of Ga OOH. The lattice type of the γ-Ga2O3 is similar to that of γ-Al2O3,which belongs to cubic,cation-deficient spinel structure. The γ-Ga2O3 has a moderate acid center with larger amount of acid content. Most of the γ-Ga2O3 is two-dimensional nanoflakes with thickness of 10 nm and diameter of 100 nm. These nanoflakes are mainly distributed in one direction,and some of them form petal-shaped patterns. The experimental results showed that the conversion rate of dimethyl ether（ DME）was about 24% at 270 ℃,which was close to equilibrium conversion. The texture properties of the catalyst had no significant change after the reaction and the specific surface of the catalyst was about 130 m^2/g. The composite catalyst composed of the γ-Ga2O3 and Cu-based catalyst was used to DME steam reforming reaction in slurry bed at 270 ℃. The conversion of DME and selectivity of H2 were as high as about 99% and 68%,respectively. The conversion of DME was over 95% after reaction time of 200 h.

关 键 词：均匀沉淀法 γ-Ga2O3 低温 浆态床 二甲醚 水蒸气重整 

分 类 号：O643[理学—物理化学] TQ426[理学—化学]