高孔体积、大孔径渣油加氢催化材料的开发

PREPARATION OF CATALYTIC MATERIAL WITH HIGH PORE VOLUME AND LARGE PORE FOR RESIDUE HYDROTREATING

以硫酸铝溶液和碳酸氢铵溶液为原料,采用化学共沉淀的方法合成氧化铝的前躯物碱式碳酸铝铵(化学式为NH 4[AlO(OH)]2HCO 3·2H 2O)。结合反应机理,研究了反应体系pH和反应温度对碱式碳酸铝铵制备的影响。所制备的碱式碳酸铝铵焙烧后生成的氧化铝粉体具有高孔体积和大孔径的特点,适合用作渣油加氢催化剂的载体材料,并可与其他拟薄水铝石复合形成满足不同要求的具有不同孔结构的载体。催化剂活性评价和工业应用结果表明,采用碱式碳酸铝铵制备的氧化铝为载体材料的渣油加氢脱金属催化剂具有良好的脱金属和降残炭性能。

The precursor of alumina,ammonium aluminum carbonate hydroxide(AACH)with the chemical composition corresponding to NH 4[AlO(OH)]2 HCO 3·2H 2 O,was prepared from aluminium sulfate solution and ammonium bicarbonate solution through chemical coprecipitation method.The effect of pH and temperature on the preparation of AACH was studied on the basis of the precipitating mechanism.The prepared alumina from calcination of AACH showed high pore volume and large pore size,was suitable to be used as the support material of residue hydrotreating catalyst,and could also be compounded with other pseudo-boehmites to form supports with different pore structures to meet different requirements.The results of activity evaluation and commercial application showed that the residue hydrodemetallization catalyst based on the AACH had good performance of demetallization and reduction of carbon residue.