摘要
在压力6MPa,空速5000h-1下,采用微反-色谱-微处理机联合装置,对沉淀法制备的Fe-Ti系合成低碳醇催化剂的活性和选择性进行了测定.在配料组成相同的情况下,并流法和反加法制成的催化剂活性较高,350℃时催化剂上的最高醇收率为0.557g/(ml·h),C2醇(碳数大于或等于2的醇)的最高含量为38.3%.实验结果表明,并流法制得的氧化态催化剂具有非晶态结构和较大的表面积.提高焙烧温度,反加法所制氧化态催化剂的衍射峰强度减弱,表明铁、钛组分间有某种相互作用.正加法所制催化剂的氧化态主要物相为α-Fe2O3,叠加扫描后发现有少量Fe2Ti3O9晶相.程序升温还原的结果表明,催化剂的还原经历了脱去外表水和铁组分还原等过程,但低温下催化剂不能充分还原.采用峰形鉴别法和逐步逼进法得到了主还原阶段的动力学参数.不同催化剂活性和选择性的差异,归因于不同制备方法使得沉淀的铁组分和浸渍的钛组分的均匀度和分散度不同,以及Fe-Ti组分的相互作用不同.
The titled catalysts were prepared with precipitation in differentways: forward charging, backward charging and parallel flow charging.Then the precipitates, after washing and drying, were impregnated withcomponents Ti and K. The composition of the catalysts could be denoted by Fe: Ti: K=1: 0. 4: 0. 05 (atomic ratio). The activity and selectivity of the catalysts for alcohol synthesis were measured at P=6. 0MPa, SV=5000 h-1, and T=250-350℃. CO/H2 was 1/2. 31 (molar