活性铝土石研制一氧化碳耐硫变换催化剂

Preparation of Anti-sulfur Shift Catalyst of Carbon Monoxide from Active Bauxite

选用水铝氧型铝土矿,经250℃水合、550℃热转相,使矿石中含有的水铝氧转化成γ、λ、η等活性相,比表面由原来的3～5m2/g升至125m2/g.以其作载体,与Co、Mo、K等活性组分草酸络合物水溶液组成的共浸渍液,进行共浸渍,制成一氧化碳耐硫变换催化剂.符合"清洁生产"和"绿色环保催化剂"的要求.其机械强度高达90(N/粒).在温度250℃,φ(汽)/φ(气)=0.5,空速为2500h-1时,测得催化剂样品活性(一氧化碳转化率%)达88%左右.并工业小试生产制备了5m3矿制CO耐硫变换催化剂,在15000t/a的小型合成氨厂工业化使用,使用14个月以来,催化剂床层热点温度维持在230～240℃之间,催化剂出口的φ(CO)<1.5%,操作稳定,碳氨日产量均达230～250t.

The alumina ore of bauxite was pretreated through hydrating at 250 ℃ and thermally treated at 550 ℃ which made its alumina ore transformed to active phase like λ, η, γ Al2O3 etc, and its specific surface area increased from 3-5 m2/g to 125 m2/g. The pretreated bauxite used as support was codipped with the aqueous solution of oxalic acid complex of active components like Co, Mo, K etc., forming sulfurresistance CO shift catalyst. It content the requires of 'clearing production' and 'green catalysts for environmentalism'. The resulted material exhibit CO conversion, Ca. 88%, under the following operation conditions, reaction temperature 250 ℃, vapor gas ratio 0.5, space velocity 2 500 h-1 and its mechanical intensity is up to 90 N/granule. Thereafter, about 5 m3 volume of the catalysts were prepared in industrial scale and were applied in a synthetic ammonia factory with a annual production of 15 000 t. For 14 months operation, the operation was stead, the hotspot temperature maintained at 230-240 ℃, the output CO concentration reduced to <1.5% and the average daily production of ammonium carbonate kept 230-250 t.